Add query language interpreter code

82 files changed, 6337 insertions, 0 deletions

diff --git a/build.gradle b/build.gradle
index 1ee577b..0a1bc57 100644
--- a/build.gradle
+++ b/build.gradle
@@ -28,6 +28,10 @@ dependencies {
     testImplementation 'junit:junit:4.12'
 
     implementation 'com.esotericsoftware:kryo:4.0.2'
+
+    // For query language parser
+    implementation files('./lib/JLex.jar')
+    implementation files('./lib/cup.jar')
 }
 
 application {
diff --git a/lib/JLex.jar b/lib/JLex.jar
new file mode 100644
index 0000000..d2dc065
--- /dev/null
+++ b/lib/JLex.jar
diff --git a/lib/cup.jar b/lib/cup.jar
new file mode 100644
index 0000000..8acbdb7
--- /dev/null
+++ b/lib/cup.jar
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/Environment.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/Environment.java
new file mode 100644
index 0000000..d45b600
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/Environment.java
@@ -0,0 +1,51 @@
+/**
+ * Copyright (c) 2014, University of Warsaw
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are permitted
+ * provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ * conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+ * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package pl.edu.mimuw.cloudatlas.interpreter;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import pl.edu.mimuw.cloudatlas.model.ValueNull;
+
+class Environment {
+	private final TableRow row;
+	private final Map<String, Integer> columns = new HashMap<String, Integer>();
+
+	public Environment(TableRow row, List<String> columns) {
+		this.row = row;
+		int i = 0;
+		for(String c : columns)
+			this.columns.put(c, i++);
+	}
+
+	public Result getIdent(String ident) {
+		try {
+			return new ResultSingle(row.getIth(columns.get(ident)));
+		} catch(NullPointerException exception) {
+			return new ResultSingle(ValueNull.getInstance());
+		}
+	}
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/Functions.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/Functions.java
new file mode 100644
index 0000000..dde84fe
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/Functions.java
@@ -0,0 +1,428 @@
+/**
+ * Copyright (c) 2014, University of Warsaw
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are permitted
+ * provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ * conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+ * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package pl.edu.mimuw.cloudatlas.interpreter;
+
+import java.text.ParseException;
+import java.util.ArrayList;
+import java.util.Calendar;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+
+import pl.edu.mimuw.cloudatlas.interpreter.Result.AggregationOperation;
+import pl.edu.mimuw.cloudatlas.interpreter.Result.TransformOperation;
+import pl.edu.mimuw.cloudatlas.interpreter.Result.UnaryOperation;
+import pl.edu.mimuw.cloudatlas.model.Type;
+import pl.edu.mimuw.cloudatlas.model.Type.PrimaryType;
+import pl.edu.mimuw.cloudatlas.model.TypeCollection;
+import pl.edu.mimuw.cloudatlas.model.TypePrimitive;
+import pl.edu.mimuw.cloudatlas.model.Value;
+import pl.edu.mimuw.cloudatlas.model.ValueBoolean;
+import pl.edu.mimuw.cloudatlas.model.ValueDouble;
+import pl.edu.mimuw.cloudatlas.model.ValueInt;
+import pl.edu.mimuw.cloudatlas.model.ValueList;
+import pl.edu.mimuw.cloudatlas.model.ValueNull;
+import pl.edu.mimuw.cloudatlas.model.ValueSet;
+import pl.edu.mimuw.cloudatlas.model.ValueTime;
+
+class Functions {
+	private static Functions instance = null;
+
+	private static final UnaryOperation ROUND = new UnaryOperation() {
+		@Override
+		public Value perform(Value v) {
+			if(v.getType().isCompatible(TypePrimitive.DOUBLE)) {
+				if(v.isNull())
+					return new ValueDouble(null);
+				return new ValueDouble((double)Math.round(((ValueDouble)v).getValue()));
+			}
+			throw new IllegalArgumentException("Value must have type " + TypePrimitive.DOUBLE + ".");
+		}
+	};
+
+	private static final UnaryOperation FLOOR = new UnaryOperation() {
+		@Override
+		public Value perform(Value v) {
+			if(v.getType().isCompatible(TypePrimitive.DOUBLE)) {
+				if(v.isNull())
+					return new ValueDouble(null);
+				return new ValueDouble((double)Math.floor(((ValueDouble)v).getValue()));
+			}
+			throw new IllegalArgumentException("Value must have type " + TypePrimitive.DOUBLE + ".");
+		}
+	};
+
+	private static final UnaryOperation CEIL = new UnaryOperation() {
+		@Override
+		public Value perform(Value v) {
+			// TODO
+			throw new UnsupportedOperationException("Not yet implemented");
+		}
+	};
+
+	private static final AggregationOperation COUNT = new AggregationOperation() {
+		@Override
+		public ValueInt perform(ValueList values) {
+			ValueList nlist = Result.filterNullsList(values);
+			if(nlist.getValue() == null) {
+				return new ValueInt(null);
+			}
+			return new ValueInt((long)nlist.size());
+		}
+	};
+
+	private static final AggregationOperation SUM = new AggregationOperation() {
+		@Override
+		public Value perform(ValueList values) {
+			// TODO
+			throw new UnsupportedOperationException("Not yet implemented");
+		}
+	};
+
+	private static final AggregationOperation AVERAGE = new AggregationOperation() {
+		@Override
+		public Value perform(ValueList values) {
+			Type elementType = ((TypeCollection)values.getType()).getElementType();
+			PrimaryType primaryType = elementType.getPrimaryType();
+
+			if(primaryType != PrimaryType.INT && primaryType != PrimaryType.DOUBLE && primaryType != PrimaryType.DURATION
+					&& primaryType != PrimaryType.NULL) {
+				throw new IllegalArgumentException("Aggregation doesn't support type: " + elementType + ".");
+			}
+
+			ValueList nlist = Result.filterNullsList(values);
+			if(nlist.getValue() == null || nlist.isEmpty()) {
+				return ValueNull.getInstance();
+			}
+
+			Value result = nlist.get(0).getDefaultValue();
+
+			for(Value v : nlist) {
+				result = result.addValue(v);
+			}
+			Value size = primaryType == PrimaryType.DOUBLE? new ValueDouble((double)nlist.size()) : new ValueInt(
+					(long)nlist.size());
+			return result.divide(size);
+		}
+	};
+
+	private static final AggregationOperation AND = new AggregationOperation() {
+		@Override
+		public ValueBoolean perform(ValueList values) { // lazy
+			ValueList nlist = Result.filterNullsList(values);
+			if(nlist.getValue() == null) {
+				return new ValueBoolean(null);
+			} else if(values.isEmpty()) {
+				return new ValueBoolean(true);
+			}
+			for(Value v : nlist) {
+				if(v.getType().isCompatible(TypePrimitive.BOOLEAN)) {
+					if(v.isNull() || !((ValueBoolean)v).getValue())
+						return new ValueBoolean(false);
+				} else
+					throw new IllegalArgumentException("Aggregation doesn't support type: " + v.getType() + ".");
+			}
+			return new ValueBoolean(true);
+		}
+	};
+
+	private static final AggregationOperation OR = new AggregationOperation() {
+		@Override
+		public ValueBoolean perform(ValueList values) { // lazy
+			// TODO
+			throw new UnsupportedOperationException("Not yet implemented");
+		}
+	};
+
+	private static final AggregationOperation MIN = new AggregationOperation() {
+		@Override
+		public Value perform(ValueList values) {
+			ValueList nlist = Result.filterNullsList(values);
+			if(nlist.getValue() == null || nlist.isEmpty()) {
+				return ValueNull.getInstance();
+			}
+			Value result = nlist.get(0);
+			for(Value v : nlist) {
+				if(((ValueBoolean)v.isLowerThan(result)).getValue()) {
+					result = v;
+				}
+			}
+			return result;
+		}
+	};
+
+	private static final AggregationOperation MAX = new AggregationOperation() {
+		@Override
+		public Value perform(ValueList values) {
+			ValueList nlist = Result.filterNullsList(values);
+			if(nlist.getValue() == null || nlist.isEmpty()) {
+				return ValueNull.getInstance();
+			}
+			Value result = nlist.get(0);
+			for(Value v : nlist) {
+				if(((ValueBoolean)v.isLowerThan(result)).negate().and(v.isEqual(result).negate()).getValue()) {
+					result = v;
+				}
+			}
+			return result;
+		}
+	};
+
+	private static final TransformOperation UNFOLD = new TransformOperation() {
+		@Override
+		public ValueList perform(ValueList values) {
+			if(!((TypeCollection)values.getType()).getElementType().isCollection()) {
+				throw new IllegalArgumentException("All elements must have a collection compatible type.");
+			}
+			ValueList nlist = Result.filterNullsList(values);
+			if(nlist.getValue() == null) {
+				return new ValueList(null,
+						((TypeCollection)((TypeCollection)values.getType()).getElementType()).getElementType());
+			} else if(nlist.isEmpty()) {
+				return new ValueList(
+						((TypeCollection)((TypeCollection)values.getType()).getElementType()).getElementType());
+			}
+			List<Value> ret = new ArrayList<Value>();
+			for(Value v : nlist) {
+				if(v.getType().getPrimaryType() == Type.PrimaryType.SET) {
+					ret.addAll((ValueSet)v);
+				} else if(v.getType().getPrimaryType() == Type.PrimaryType.LIST) {
+					ret.addAll((ValueList)v);
+				}
+			}
+			return new ValueList(ret,
+					((TypeCollection)((TypeCollection)values.getType()).getElementType()).getElementType());
+		}
+	};
+
+	private static final TransformOperation DISTINCT = new TransformOperation() {
+		@Override
+		public ValueList perform(ValueList values) {
+			if(values.isEmpty())
+				return new ValueList(((TypeCollection)values.getType()).getElementType());
+			List<Value> ret = new ArrayList<Value>();
+			for(Value v : values) {
+				if(!ret.contains(v)) {
+					ret.add(v);
+				}
+			}
+			return new ValueList(ret, ((TypeCollection)values.getType()).getElementType());
+		}
+	};
+
+	private static final TransformOperation SORT = new TransformOperation() {
+		@Override
+		public ValueList perform(ValueList values) {
+			if(values.isEmpty())
+				return new ValueList(((TypeCollection)values.getType()).getElementType());
+			List<Value> ret = new ArrayList<Value>();
+			ret.addAll(values);
+			Collections.sort(ret, new Comparator<Value>() {
+				public int compare(Value v1, Value v2) {
+					if(((ValueBoolean)v1.isLowerThan(v2)).getValue()) {
+						return -1;
+					} else if(((ValueBoolean)v1.isEqual(v2)).getValue()) {
+						return 0;
+					} else {
+						return 1;
+					}
+				}
+			});
+			return new ValueList(ret, ((TypeCollection)values.getType()).getElementType());
+		}
+	};
+
+	private final ValueTime EPOCH;
+
+	private Functions() {
+		try {
+			EPOCH = new ValueTime("2000/01/01 00:00:00.000");
+		} catch(ParseException exception) {
+			throw new InternalInterpreterException("Cannot parse time when creating an EPOCH object.\n"
+					+ exception.getMessage());
+		}
+	}
+
+	public static Functions getInstance() {
+		if(instance == null)
+			instance = new Functions();
+		return instance;
+	}
+
+	public Result evaluate(String name, List<Result> arguments) {
+		switch(name) {
+			case "round":
+				if(arguments.size() == 1)
+					return arguments.get(0).unaryOperation(ROUND);
+				break;
+			case "floor":
+				if(arguments.size() == 1)
+					return arguments.get(0).unaryOperation(FLOOR);
+				break;
+			case "ceil":
+				if(arguments.size() == 1)
+					return arguments.get(0).unaryOperation(CEIL);
+				break;
+			case "now":
+				if(arguments.size() == 0)
+					return new ResultSingle(new ValueTime(Calendar.getInstance().getTimeInMillis()));
+				break;
+			case "epoch":
+				if(arguments.size() == 0)
+					return new ResultSingle(EPOCH);
+				break;
+			case "count":
+				if(arguments.size() == 1)
+					return arguments.get(0).aggregationOperation(COUNT);
+				break;
+			case "size":
+				if(arguments.size() == 1)
+					return arguments.get(0).valueSize();
+				break;
+			case "sum":
+				if(arguments.size() == 1)
+					return arguments.get(0).aggregationOperation(SUM);
+				break;
+			case "avg":
+				if(arguments.size() == 1)
+					return arguments.get(0).aggregationOperation(AVERAGE);
+				break;
+			case "land":
+				if(arguments.size() == 1)
+					return arguments.get(0).aggregationOperation(AND);
+				break;
+			case "lor":
+				if(arguments.size() == 1)
+					return arguments.get(0).aggregationOperation(OR);
+				break;
+			case "min":
+				if(arguments.size() == 1)
+					return arguments.get(0).aggregationOperation(MIN);
+				break;
+			case "max":
+				if(arguments.size() == 1)
+					return arguments.get(0).aggregationOperation(MAX);
+				break;
+			case "unfold":
+				if(arguments.size() == 1)
+					return arguments.get(0).transformOperation(UNFOLD);
+				break;
+			case "distinct":
+				if(arguments.size() == 1)
+					return arguments.get(0).transformOperation(DISTINCT);
+				break;
+			case "sort":
+				if(arguments.size() == 1)
+					return arguments.get(0).transformOperation(SORT);
+				break;
+			case "filterNulls":
+				if(arguments.size() == 1)
+					return arguments.get(0).filterNulls();
+				break;
+			case "first":
+				if(arguments.size() == 2) {
+					Value size = arguments.get(0).getValue();
+					if(size.getType().isCompatible(TypePrimitive.INTEGER) && ((ValueInt)size).getValue().intValue() >= 0)
+						return arguments.get(1).first(((ValueInt)size).getValue().intValue());
+					throw new IllegalArgumentException("First argument must have type " + TypePrimitive.INTEGER
+							+ " and be >= 0.");
+				}
+				break;
+			case "last":
+				if(arguments.size() == 2) {
+					Value size = arguments.get(0).getValue();
+					if(size.getType().isCompatible(TypePrimitive.INTEGER) && ((ValueInt)size).getValue().intValue() >= 0)
+						return arguments.get(1).last(((ValueInt)size).getValue().intValue());
+					throw new IllegalArgumentException("First argument must have type " + TypePrimitive.INTEGER
+							+ " and be >= 0.");
+				}
+				break;
+			case "random":
+				if(arguments.size() == 2) {
+					Value size = arguments.get(0).getValue();
+					if(size.getType().isCompatible(TypePrimitive.INTEGER) && ((ValueInt)size).getValue().intValue() >= 0)
+						return arguments.get(1).random(((ValueInt)size).getValue().intValue());
+					throw new IllegalArgumentException("First argument must have type " + TypePrimitive.INTEGER
+							+ " and be >= 0.");
+				}
+				break;
+			case "to_boolean":
+				if(arguments.size() == 1)
+					return arguments.get(0).convertTo(TypePrimitive.BOOLEAN);
+				break;
+			case "to_contact":
+				if(arguments.size() == 1)
+					return arguments.get(0).convertTo(TypePrimitive.CONTACT);
+				break;
+			case "to_double":
+				if(arguments.size() == 1)
+					return arguments.get(0).convertTo(TypePrimitive.DOUBLE);
+				break;
+			case "to_duration":
+				if(arguments.size() == 1)
+					return arguments.get(0).convertTo(TypePrimitive.DURATION);
+				break;
+			case "to_integer":
+				if(arguments.size() == 1)
+					return arguments.get(0).convertTo(TypePrimitive.INTEGER);
+				break;
+			case "to_string":
+				if(arguments.size() == 1)
+					return arguments.get(0).convertTo(TypePrimitive.STRING);
+				break;
+			case "to_time":
+				if(arguments.size() == 1)
+					return arguments.get(0).convertTo(TypePrimitive.TIME);
+				break;
+			case "to_set":
+				if(arguments.size() == 1) {
+					Type t = arguments.get(0).getType();
+					if(t.isCollection()) {
+						Type elementType = ((TypeCollection)t).getElementType();
+						return arguments.get(0).convertTo(new TypeCollection(Type.PrimaryType.SET, elementType));
+					}
+					throw new IllegalArgumentException("First argument must be a collection.");
+				}
+				break;
+			case "to_list":
+				if(arguments.size() == 1) {
+					Type t = arguments.get(0).getType();
+					if(t.isCollection()) {
+						Type elementType = ((TypeCollection)t).getElementType();
+						return arguments.get(0).convertTo(new TypeCollection(Type.PrimaryType.LIST, elementType));
+					}
+					throw new IllegalArgumentException("First argument must be a collection.");
+				}
+				break;
+			case "isNull":
+				if(arguments.size() == 1)
+					return arguments.get(0).isNull();
+				break;
+			default:
+				throw new IllegalArgumentException("Illegal function name.");
+		}
+		throw new IllegalArgumentException("Illegal number of arguments.");
+	}
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/InsideQueryException.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/InsideQueryException.java
new file mode 100644
index 0000000..d591c35
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/InsideQueryException.java
@@ -0,0 +1,50 @@
+/**
+ * Copyright (c) 2014, University of Warsaw
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are permitted
+ * provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ * conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+ * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package pl.edu.mimuw.cloudatlas.interpreter;
+
+@SuppressWarnings("serial")
+public class InsideQueryException extends InterpreterException {
+	private final String fragment;
+	private final Exception exception;
+
+	protected InsideQueryException(String fragment, Exception exception) {
+		super(exception.getMessage() + "\nin: " + fragment);
+		this.fragment = fragment;
+		this.exception = exception;
+	}
+
+	public String getFragment() {
+		return fragment;
+	}
+
+	public Exception getException() {
+		return exception;
+	}
+
+	@Override
+	public StackTraceElement[] getStackTrace() {
+		return exception.getStackTrace();
+	}
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/InternalInterpreterException.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/InternalInterpreterException.java
new file mode 100644
index 0000000..8010df2
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/InternalInterpreterException.java
@@ -0,0 +1,32 @@
+/**
+ * Copyright (c) 2014, University of Warsaw
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are permitted
+ * provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ * conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+ * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package pl.edu.mimuw.cloudatlas.interpreter;
+
+@SuppressWarnings("serial")
+public class InternalInterpreterException extends InterpreterException {
+	protected InternalInterpreterException(String message) {
+		super(message);
+	}
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/Interpreter.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/Interpreter.java
new file mode 100644
index 0000000..4634459
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/Interpreter.java
@@ -0,0 +1,493 @@
+/**
+ * Copyright (c) 2014, University of Warsaw
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are permitted
+ * provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ * conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+ * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package pl.edu.mimuw.cloudatlas.interpreter;
+
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.List;
+
+import pl.edu.mimuw.cloudatlas.interpreter.query.PrettyPrinter;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.AliasedSelItemC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.AscOrderC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprAddC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprDivC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprModC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprMulC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprNegC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprSubC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExpr;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprBasicExprC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprCmpC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprRegExpC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprAndC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprBoolExprC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprNotC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprOrC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.DescOrderC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EBoolC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ECondExprC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EDblC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EFunC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EIdentC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EIntC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EStmtC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EStrC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NoNullsC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NoOrderByC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NoOrderC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NoWhereC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NullFirstsC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Nulls;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NullsLastC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Order;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderBy;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderByC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderItem;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderItemC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Program;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ProgramC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOp;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpEqC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpGeC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpGtC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpLeC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpLtC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpNeC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItem;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItemC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Statement;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.StatementC;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Where;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.WhereC;
+import pl.edu.mimuw.cloudatlas.model.Attribute;
+import pl.edu.mimuw.cloudatlas.model.TypePrimitive;
+import pl.edu.mimuw.cloudatlas.model.Value;
+import pl.edu.mimuw.cloudatlas.model.ValueBoolean;
+import pl.edu.mimuw.cloudatlas.model.ValueDouble;
+import pl.edu.mimuw.cloudatlas.model.ValueInt;
+import pl.edu.mimuw.cloudatlas.model.ValueString;
+import pl.edu.mimuw.cloudatlas.model.ZMI;
+
+public class Interpreter {
+	private static class ValuesPair {
+		public final Result left;
+		public final Result right;
+
+		public ValuesPair(Result left, Result right) {
+			this.left = left;
+			this.right = right;
+		}
+	}
+
+	private final ZMI zmi;
+
+	public Interpreter(ZMI zmi) {
+		this.zmi = zmi;
+	}
+
+	private static Boolean getBoolean(Value value) {
+		if(value.getType().isCompatible(TypePrimitive.BOOLEAN)) {
+			Boolean b = ((ValueBoolean)value).getValue();
+			return b == null? false : b.booleanValue();
+		}
+		throw new InvalidTypeException(TypePrimitive.BOOLEAN, value.getType());
+	}
+
+	public List<QueryResult> interpretProgram(Program program) {
+		return program.accept(new ProgramInterpreter(), zmi);
+	}
+
+	public List<QueryResult> interpretStatement(Statement statement) {
+		return statement.accept(new StatementInterpreter(), zmi);
+	}
+
+	public class ProgramInterpreter implements Program.Visitor<List<QueryResult>, ZMI> {
+		public List<QueryResult> visit(ProgramC program, ZMI zmi) {
+			List<QueryResult> results = new ArrayList<QueryResult>();
+			for(Statement s : program.liststatement_) {
+				try {
+					List<QueryResult> l = s.accept(new StatementInterpreter(), zmi);
+					for(QueryResult qr : l)
+						if(qr.getName() == null)
+							throw new IllegalArgumentException("All items in top-level SELECT must be aliased.");
+					results.addAll(l);
+				} catch(Exception exception) {
+					throw new InsideQueryException(PrettyPrinter.print(s), exception);
+				}
+			}
+			return results;
+		}
+	}
+
+	public class StatementInterpreter implements Statement.Visitor<List<QueryResult>, ZMI> {
+		public List<QueryResult> visit(StatementC statement, ZMI zmi) {
+			Table table = new Table(zmi);
+			try {
+				table = statement.where_.accept(new WhereInterpreter(), table);
+			} catch(Exception exception) {
+				throw new InsideQueryException(PrettyPrinter.print(statement.where_), exception);
+			}
+			try {
+				table = statement.orderby_.accept(new OrderByInterpreter(), table);
+			} catch(Exception exception) {
+				throw new InsideQueryException(PrettyPrinter.print(statement.orderby_), exception);
+			}
+			List<QueryResult> ret = new ArrayList<QueryResult>();
+
+			for(SelItem selItem : statement.listselitem_) {
+				try {
+					QueryResult qr = selItem.accept(new SelItemInterpreter(), table);
+					if(qr.getName() != null) {
+						for(QueryResult qrRet : ret)
+							if(qr.getName().getName().equals(qrRet.getName().getName()))
+								throw new IllegalArgumentException("Alias collision.");
+					}
+					ret.add(qr);
+				} catch(Exception exception) {
+					throw new InsideQueryException(PrettyPrinter.print(selItem), exception);
+				}
+			}
+
+			return ret;
+		}
+	}
+
+	public class WhereInterpreter implements Where.Visitor<Table, Table> {
+		public Table visit(NoWhereC where, Table table) {
+			return table;
+		}
+
+		public Table visit(WhereC where, Table table) {
+			Table result = new Table(table);
+			for(TableRow row : table) {
+				Environment env = new Environment(row, table.getColumns());
+				Value value = where.condexpr_.accept(new CondExprInterpreter(), env).getValue();
+				if(getBoolean(value))
+					result.appendRow(row);
+			}
+			return result;
+		}
+	}
+
+	public class OrderByInterpreter implements OrderBy.Visitor<Table, Table> {
+		public Table visit(NoOrderByC orderBy, Table table) {
+			return table;
+		}
+
+		public Table visit(OrderByC orderBy, Table table) {
+			for(OrderItem item : orderBy.listorderitem_) {
+				try {
+					table = item.accept(new OrderItemInterpreter(), table);
+				} catch(Exception exception) {
+					throw new InsideQueryException(PrettyPrinter.print(item), exception);
+				}
+			}
+			return table;
+		}
+	}
+
+	public class OrderItemInterpreter implements OrderItem.Visitor<Table, Table> {
+		public Table visit(final OrderItemC orderItem, final Table table) {
+			Comparator<TableRow> comparator = new Comparator<TableRow>() {
+				@Override
+				public int compare(TableRow row1, TableRow row2) {
+					Environment env1 = new Environment(row1, table.getColumns());
+					Result expr1 = orderItem.condexpr_.accept(new CondExprInterpreter(), env1);
+					Environment env2 = new Environment(row2, table.getColumns());
+					Result expr2 = orderItem.condexpr_.accept(new CondExprInterpreter(), env2);
+					ValuesPair pair = new ValuesPair(expr1, expr2);
+					int result = orderItem.nulls_.accept(new NullsInterpreter(), pair);
+					if(result == 0)
+						result = orderItem.order_.accept(new OrderInterpreter(), pair);
+					return result;
+				}
+			};
+			table.sort(comparator);
+			return table;
+		}
+	}
+
+	public class OrderInterpreter implements Order.Visitor<Integer, ValuesPair> {
+		private int compareAsc(ValuesPair pair) {
+			if(getBoolean(pair.left.isEqual(pair.right).getValue()))
+				return 0;
+			if(getBoolean(pair.left.isLowerThan(pair.right).getValue()))
+				return -1;
+			return 1;
+		}
+
+		public Integer visit(AscOrderC order, ValuesPair pair) {
+			return compareAsc(pair);
+		}
+
+		public Integer visit(DescOrderC order, ValuesPair pair) {
+			return -compareAsc(pair);
+		}
+
+		public Integer visit(NoOrderC order, ValuesPair pair) {
+			return compareAsc(pair);
+		}
+	}
+
+	public class NullsInterpreter implements Nulls.Visitor<Integer, ValuesPair> {
+		private Integer nullsFirst(ValuesPair pair) {
+			if(pair.left.getValue().isNull()) {
+				if(pair.right.getValue().isNull())
+					return 0;
+				return -1;
+			}
+			if(pair.right.getValue().isNull())
+				return 1;
+			return 0;
+		}
+
+		public Integer visit(NoNullsC nulls, ValuesPair pair) {
+			return nullsFirst(pair);
+		}
+
+		public Integer visit(NullFirstsC nulls, ValuesPair pair) {
+			return nullsFirst(pair);
+		}
+
+		public Integer visit(NullsLastC nulls, ValuesPair pair) {
+			return -nullsFirst(pair);
+		}
+	}
+
+	public class SelItemInterpreter implements SelItem.Visitor<QueryResult, Table> {
+		public QueryResult visit(SelItemC selItem, Table table) {
+			Environment env = null; // TODO
+			Result result = selItem.condexpr_.accept(new CondExprInterpreter(), env);
+			return new QueryResult(result.getValue());
+		}
+
+		public QueryResult visit(AliasedSelItemC selItem, Table table) {
+			Environment env = null; // TODO
+			Result result = selItem.condexpr_.accept(new CondExprInterpreter(), env);
+			return new QueryResult(new Attribute(selItem.qident_), result.getValue());
+		}
+	}
+
+	public class BoolExprInterpreter implements BoolExpr.Visitor<Result, Environment> {
+		public Result visit(BoolExprCmpC expr, Environment env) {
+			try {
+				Result left = expr.basicexpr_1.accept(new BasicExprInterpreter(), env);
+				Result right = expr.basicexpr_2.accept(new BasicExprInterpreter(), env);
+				return expr.relop_.accept(new RelOpInterpreter(), new ValuesPair(left, right));
+			} catch(Exception exception) {
+				throw new InsideQueryException(PrettyPrinter.print(expr), exception);
+			}
+		}
+
+		public Result visit(BoolExprRegExpC expr, Environment env) {
+			try {
+				Result left = expr.basicexpr_.accept(new BasicExprInterpreter(), env);
+				return (new ResultSingle(new ValueString(expr.string_))).regExpr(left);
+			} catch(Exception exception) {
+				throw new InsideQueryException(PrettyPrinter.print(expr), exception);
+			}
+		}
+
+		public Result visit(BoolExprBasicExprC expr, Environment env) {
+			return expr.basicexpr_.accept(new BasicExprInterpreter(), env);
+		}
+	}
+
+	public class CondExprInterpreter implements CondExpr.Visitor<Result, Environment> {
+		public Result visit(CondExprOrC expr, Environment env) {
+			try {
+				Result left = expr.condexpr_1.accept(new CondExprInterpreter(), env);
+				Result right = expr.condexpr_2.accept(new CondExprInterpreter(), env);
+				return left.or(right);
+			} catch(Exception exception) {
+				throw new InsideQueryException(PrettyPrinter.print(expr), exception);
+			}
+		}
+
+		public Result visit(CondExprAndC expr, Environment env) {
+			// TODO
+			throw new UnsupportedOperationException("Not yet implemented");
+		}
+
+		public Result visit(CondExprNotC expr, Environment env) {
+			try {
+				return expr.condexpr_.accept(new CondExprInterpreter(), env).negate();
+			} catch(Exception exception) {
+				throw new InsideQueryException(PrettyPrinter.print(expr), exception);
+			}
+		}
+
+		public Result visit(CondExprBoolExprC expr, Environment env) {
+			return expr.boolexpr_.accept(new BoolExprInterpreter(), env);
+		}
+	}
+
+	public class BasicExprInterpreter implements BasicExpr.Visitor<Result, Environment> {
+		public Result visit(BasicExprAddC expr, Environment env) {
+			try {
+				Result left = expr.basicexpr_1.accept(new BasicExprInterpreter(), env);
+				Result right = expr.basicexpr_2.accept(new BasicExprInterpreter(), env);
+				return left.addValue(right);
+			} catch(Exception exception) {
+				throw new InsideQueryException(PrettyPrinter.print(expr), exception);
+			}
+		}
+
+		public Result visit(BasicExprSubC expr, Environment env) {
+			try {
+				Result left = expr.basicexpr_1.accept(new BasicExprInterpreter(), env);
+				Result right = expr.basicexpr_2.accept(new BasicExprInterpreter(), env);
+				return left.subtract(right);
+			} catch(Exception exception) {
+				throw new InsideQueryException(PrettyPrinter.print(expr), exception);
+			}
+		}
+
+		public Result visit(BasicExprMulC expr, Environment env) {
+			// TODO
+			throw new UnsupportedOperationException("Not yet implemented");
+		}
+
+		public Result visit(BasicExprDivC expr, Environment env) {
+			try {
+				Result left = expr.basicexpr_1.accept(new BasicExprInterpreter(), env);
+				Result right = expr.basicexpr_2.accept(new BasicExprInterpreter(), env);
+				return left.divide(right);
+			} catch(Exception exception) {
+				throw new InsideQueryException(PrettyPrinter.print(expr), exception);
+			}
+		}
+
+		public Result visit(BasicExprModC expr, Environment env) {
+			try {
+				Result left = expr.basicexpr_1.accept(new BasicExprInterpreter(), env);
+				Result right = expr.basicexpr_2.accept(new BasicExprInterpreter(), env);
+				return left.modulo(right);
+			} catch(Exception exception) {
+				throw new InsideQueryException(PrettyPrinter.print(expr), exception);
+			}
+		}
+
+		public Result visit(BasicExprNegC expr, Environment env) {
+			try {
+				return expr.basicexpr_.accept(new BasicExprInterpreter(), env).negate();
+			} catch(Exception exception) {
+				throw new InsideQueryException(PrettyPrinter.print(expr), exception);
+			}
+		}
+
+		public Result visit(EIdentC expr, Environment env) {
+			return env.getIdent(expr.qident_);
+		}
+
+		public Result visit(EFunC expr, Environment env) {
+			try {
+				List<Result> arguments = new ArrayList<Result>(expr.listcondexpr_.size());
+				for(CondExpr arg : expr.listcondexpr_)
+					arguments.add(arg.accept(new CondExprInterpreter(), env));
+
+				return Functions.getInstance().evaluate(expr.qident_, arguments);
+			} catch(Exception exception) {
+				throw new InsideQueryException(PrettyPrinter.print(expr), exception);
+			}
+		}
+
+		public ResultSingle visit(EStrC expr, Environment env) {
+			return new ResultSingle(new ValueString(expr.string_));
+		}
+
+		public ResultSingle visit(EBoolC expr, Environment env) {
+			ValueBoolean value;
+			if(expr.qbool_.compareTo("true") == 0)
+				value = new ValueBoolean(true);
+			else if(expr.qbool_.compareTo("false") == 0)
+				value = new ValueBoolean(false);
+			else
+				throw new InternalInterpreterException("Incorrect boolean constant: " + PrettyPrinter.print(expr));
+			return new ResultSingle(value);
+		}
+
+		public ResultSingle visit(EIntC expr, Environment env) {
+			try {
+				return new ResultSingle(new ValueInt(Long.parseLong(expr.qinteger_)));
+			} catch(NumberFormatException exception) {
+				throw new InternalInterpreterException(exception.getMessage());
+			}
+		}
+
+		public ResultSingle visit(EDblC expr, Environment env) {
+			try {
+				return new ResultSingle(new ValueDouble(Double.parseDouble(expr.qdouble_)));
+			} catch(NumberFormatException exception) {
+				throw new InternalInterpreterException(exception.getMessage());
+			}
+		}
+
+		public Result visit(ECondExprC expr, Environment env) {
+			return expr.condexpr_.accept(new CondExprInterpreter(), env);
+		}
+
+		public ResultSingle visit(EStmtC expr, Environment env) {
+			try {
+				List<QueryResult> l = expr.statement_.accept(new StatementInterpreter(), zmi);
+				if(l.size() != 1)
+					throw new IllegalArgumentException("Nested queries must SELECT exactly one item.");
+				return new ResultSingle(l.get(0).getValue());
+			} catch(Exception exception) {
+				throw new InsideQueryException(PrettyPrinter.print(expr), exception);
+			}
+		}
+	}
+
+	public class RelOpInterpreter implements RelOp.Visitor<Result, ValuesPair> {
+		public Result visit(RelOpGtC op, ValuesPair pair) {
+			return pair.left.isLowerThan(pair.right).negate().and(pair.left.isEqual(pair.right).negate());
+		}
+
+		public Result visit(RelOpEqC op, ValuesPair pair) {
+			// TODO
+			throw new UnsupportedOperationException("Not yet implemented");
+		}
+
+		public Result visit(RelOpNeC op, ValuesPair pair) {
+			return pair.left.isEqual(pair.right).negate();
+		}
+
+		public Result visit(RelOpLtC op, ValuesPair pair) {
+			return pair.left.isLowerThan(pair.right);
+		}
+
+		public Result visit(RelOpLeC op, ValuesPair pair) {
+			// TODO
+			throw new UnsupportedOperationException("Not yet implemented");
+		}
+
+		public Result visit(RelOpGeC op, ValuesPair pair) {
+			return pair.left.isLowerThan(pair.right).negate();
+		}
+	}
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/InterpreterException.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/InterpreterException.java
new file mode 100644
index 0000000..5dbe921
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/InterpreterException.java
@@ -0,0 +1,32 @@
+/**
+ * Copyright (c) 2014, University of Warsaw
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are permitted
+ * provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ * conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+ * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package pl.edu.mimuw.cloudatlas.interpreter;
+
+@SuppressWarnings("serial")
+public abstract class InterpreterException extends RuntimeException {
+	protected InterpreterException(String message) {
+		super(message);
+	}
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/InvalidTypeException.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/InvalidTypeException.java
new file mode 100644
index 0000000..23a325f
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/InvalidTypeException.java
@@ -0,0 +1,47 @@
+/**
+ * Copyright (c) 2014, University of Warsaw
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are permitted
+ * provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ * conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+ * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package pl.edu.mimuw.cloudatlas.interpreter;
+
+import pl.edu.mimuw.cloudatlas.model.Type;
+
+@SuppressWarnings("serial")
+public class InvalidTypeException extends InterpreterException {
+	private final Type expected;
+	private final Type got;
+
+	protected InvalidTypeException(Type expected, Type got) {
+		super("Invalid type. Expected " + expected + ", got " + got + ".");
+		this.expected = expected;
+		this.got = got;
+	}
+
+	public Type getExpected() {
+		return expected;
+	}
+
+	public Type getGot() {
+		return got;
+	}
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/Main.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/Main.java
new file mode 100644
index 0000000..a9857ed
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/Main.java
@@ -0,0 +1,247 @@
+/**
+ * Copyright (c) 2014, University of Warsaw
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are permitted
+ * provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ * conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+ * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package pl.edu.mimuw.cloudatlas.interpreter;
+
+import java.io.ByteArrayInputStream;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+import java.text.ParseException;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Scanner;
+
+import pl.edu.mimuw.cloudatlas.interpreter.query.Yylex;
+import pl.edu.mimuw.cloudatlas.interpreter.query.parser;
+import pl.edu.mimuw.cloudatlas.model.PathName;
+import pl.edu.mimuw.cloudatlas.model.TypePrimitive;
+import pl.edu.mimuw.cloudatlas.model.Value;
+import pl.edu.mimuw.cloudatlas.model.ValueBoolean;
+import pl.edu.mimuw.cloudatlas.model.ValueContact;
+import pl.edu.mimuw.cloudatlas.model.ValueDouble;
+import pl.edu.mimuw.cloudatlas.model.ValueDuration;
+import pl.edu.mimuw.cloudatlas.model.ValueInt;
+import pl.edu.mimuw.cloudatlas.model.ValueList;
+import pl.edu.mimuw.cloudatlas.model.ValueSet;
+import pl.edu.mimuw.cloudatlas.model.ValueString;
+import pl.edu.mimuw.cloudatlas.model.ValueTime;
+import pl.edu.mimuw.cloudatlas.model.ZMI;
+
+public class Main {
+	private static ZMI root;
+	
+	public static void main(String[] args) throws Exception {
+		root = createTestHierarchy();
+		Scanner scanner = new Scanner(System.in);
+		scanner.useDelimiter("\\n");
+		while(scanner.hasNext())
+			executeQueries(root, scanner.next());
+		scanner.close();
+	}
+	
+	private static PathName getPathName(ZMI zmi) {
+		String name = ((ValueString)zmi.getAttributes().get("name")).getValue();
+		return zmi.getFather() == null? PathName.ROOT : getPathName(zmi.getFather()).levelDown(name);
+	}
+	
+	private static void executeQueries(ZMI zmi, String query) throws Exception {
+		if(!zmi.getSons().isEmpty()) {
+			for(ZMI son : zmi.getSons())
+				executeQueries(son, query);
+			Interpreter interpreter = new Interpreter(zmi);
+			Yylex lex = new Yylex(new ByteArrayInputStream(query.getBytes()));
+			try {
+				List<QueryResult> result = interpreter.interpretProgram((new parser(lex)).pProgram());
+				PathName zone = getPathName(zmi);
+				for(QueryResult r : result) {
+					System.out.println(zone + ": " + r);
+					zmi.getAttributes().addOrChange(r.getName(), r.getValue());
+				}
+			} catch(InterpreterException exception) {}
+		}
+	}
+	
+	private static ValueContact createContact(String path, byte ip1, byte ip2, byte ip3, byte ip4)
+			throws UnknownHostException {
+		return new ValueContact(new PathName(path), InetAddress.getByAddress(new byte[] {
+			ip1, ip2, ip3, ip4
+		}));
+	}
+	
+	private static ZMI createTestHierarchy() throws ParseException, UnknownHostException {
+		ValueContact violet07Contact = createContact("/uw/violet07", (byte)10, (byte)1, (byte)1, (byte)10);
+		ValueContact khaki13Contact = createContact("/uw/khaki13", (byte)10, (byte)1, (byte)1, (byte)38);
+		ValueContact khaki31Contact = createContact("/uw/khaki31", (byte)10, (byte)1, (byte)1, (byte)39);
+		ValueContact whatever01Contact = createContact("/uw/whatever01", (byte)82, (byte)111, (byte)52, (byte)56);
+		ValueContact whatever02Contact = createContact("/uw/whatever02", (byte)82, (byte)111, (byte)52, (byte)57);
+		
+		List<Value> list;
+		
+		root = new ZMI();
+		root.getAttributes().add("level", new ValueInt(0l));
+		root.getAttributes().add("name", new ValueString(null));
+		root.getAttributes().add("owner", new ValueString("/uw/violet07"));
+		root.getAttributes().add("timestamp", new ValueTime("2012/11/09 20:10:17.342"));
+		root.getAttributes().add("contacts", new ValueSet(TypePrimitive.CONTACT));
+		root.getAttributes().add("cardinality", new ValueInt(0l));
+		
+		ZMI uw = new ZMI(root);
+		root.addSon(uw);
+		uw.getAttributes().add("level", new ValueInt(1l));
+		uw.getAttributes().add("name", new ValueString("uw"));
+		uw.getAttributes().add("owner", new ValueString("/uw/violet07"));
+		uw.getAttributes().add("timestamp", new ValueTime("2012/11/09 20:8:13.123"));
+		uw.getAttributes().add("contacts", new ValueSet(TypePrimitive.CONTACT));
+		uw.getAttributes().add("cardinality", new ValueInt(0l));
+		
+		ZMI pjwstk = new ZMI(root);
+		root.addSon(pjwstk);
+		pjwstk.getAttributes().add("level", new ValueInt(1l));
+		pjwstk.getAttributes().add("name", new ValueString("pjwstk"));
+		pjwstk.getAttributes().add("owner", new ValueString("/pjwstk/whatever01"));
+		pjwstk.getAttributes().add("timestamp", new ValueTime("2012/11/09 20:8:13.123"));
+		pjwstk.getAttributes().add("contacts", new ValueSet(TypePrimitive.CONTACT));
+		pjwstk.getAttributes().add("cardinality", new ValueInt(0l));
+		
+		ZMI violet07 = new ZMI(uw);
+		uw.addSon(violet07);
+		violet07.getAttributes().add("level", new ValueInt(2l));
+		violet07.getAttributes().add("name", new ValueString("violet07"));
+		violet07.getAttributes().add("owner", new ValueString("/uw/violet07"));
+		violet07.getAttributes().add("timestamp", new ValueTime("2012/11/09 18:00:00.000"));
+		list = Arrays.asList(new Value[] {
+			khaki31Contact, whatever01Contact
+		});
+		violet07.getAttributes().add("contacts", new ValueSet(new HashSet<Value>(list), TypePrimitive.CONTACT));
+		violet07.getAttributes().add("cardinality", new ValueInt(1l));
+		list = Arrays.asList(new Value[] {
+			violet07Contact,
+		});
+		violet07.getAttributes().add("members", new ValueSet(new HashSet<Value>(list), TypePrimitive.CONTACT));
+		violet07.getAttributes().add("creation", new ValueTime("2011/11/09 20:8:13.123"));
+		violet07.getAttributes().add("cpu_usage", new ValueDouble(0.9));
+		violet07.getAttributes().add("num_cores", new ValueInt(3l));
+		violet07.getAttributes().add("has_ups", new ValueBoolean(null));
+		list = Arrays.asList(new Value[] {
+			new ValueString("tola"), new ValueString("tosia"),
+		});
+		violet07.getAttributes().add("some_names", new ValueList(list, TypePrimitive.STRING));
+		violet07.getAttributes().add("expiry", new ValueDuration(13l, 12l, 0l, 0l, 0l));
+		
+		ZMI khaki31 = new ZMI(uw);
+		uw.addSon(khaki31);
+		khaki31.getAttributes().add("level", new ValueInt(2l));
+		khaki31.getAttributes().add("name", new ValueString("khaki31"));
+		khaki31.getAttributes().add("owner", new ValueString("/uw/khaki31"));
+		khaki31.getAttributes().add("timestamp", new ValueTime("2012/11/09 20:03:00.000"));
+		list = Arrays.asList(new Value[] {
+			violet07Contact, whatever02Contact,
+		});
+		khaki31.getAttributes().add("contacts", new ValueSet(new HashSet<Value>(list), TypePrimitive.CONTACT));
+		khaki31.getAttributes().add("cardinality", new ValueInt(1l));
+		list = Arrays.asList(new Value[] {
+			khaki31Contact
+		});
+		khaki31.getAttributes().add("members", new ValueSet(new HashSet<Value>(list), TypePrimitive.CONTACT));
+		khaki31.getAttributes().add("creation", new ValueTime("2011/11/09 20:12:13.123"));
+		khaki31.getAttributes().add("cpu_usage", new ValueDouble(null));
+		khaki31.getAttributes().add("num_cores", new ValueInt(3l));
+		khaki31.getAttributes().add("has_ups", new ValueBoolean(false));
+		list = Arrays.asList(new Value[] {
+			new ValueString("agatka"), new ValueString("beatka"), new ValueString("celina"),
+		});
+		khaki31.getAttributes().add("some_names", new ValueList(list, TypePrimitive.STRING));
+		khaki31.getAttributes().add("expiry", new ValueDuration(-13l, -11l, 0l, 0l, 0l));
+		
+		ZMI khaki13 = new ZMI(uw);
+		uw.addSon(khaki13);
+		khaki13.getAttributes().add("level", new ValueInt(2l));
+		khaki13.getAttributes().add("name", new ValueString("khaki13"));
+		khaki13.getAttributes().add("owner", new ValueString("/uw/khaki13"));
+		khaki13.getAttributes().add("timestamp", new ValueTime("2012/11/09 21:03:00.000"));
+		list = Arrays.asList(new Value[] {});
+		khaki13.getAttributes().add("contacts", new ValueSet(new HashSet<Value>(list), TypePrimitive.CONTACT));
+		khaki13.getAttributes().add("cardinality", new ValueInt(1l));
+		list = Arrays.asList(new Value[] {
+			khaki13Contact,
+		});
+		khaki13.getAttributes().add("members", new ValueSet(new HashSet<Value>(list), TypePrimitive.CONTACT));
+		khaki13.getAttributes().add("creation", new ValueTime((Long)null));
+		khaki13.getAttributes().add("cpu_usage", new ValueDouble(0.1));
+		khaki13.getAttributes().add("num_cores", new ValueInt(null));
+		khaki13.getAttributes().add("has_ups", new ValueBoolean(true));
+		list = Arrays.asList(new Value[] {});
+		khaki13.getAttributes().add("some_names", new ValueList(list, TypePrimitive.STRING));
+		khaki13.getAttributes().add("expiry", new ValueDuration((Long)null));
+		
+		ZMI whatever01 = new ZMI(pjwstk);
+		pjwstk.addSon(whatever01);
+		whatever01.getAttributes().add("level", new ValueInt(2l));
+		whatever01.getAttributes().add("name", new ValueString("whatever01"));
+		whatever01.getAttributes().add("owner", new ValueString("/uw/whatever01"));
+		whatever01.getAttributes().add("timestamp", new ValueTime("2012/11/09 21:12:00.000"));
+		list = Arrays.asList(new Value[] {
+			violet07Contact, whatever02Contact,
+		});
+		whatever01.getAttributes().add("contacts", new ValueSet(new HashSet<Value>(list), TypePrimitive.CONTACT));
+		whatever01.getAttributes().add("cardinality", new ValueInt(1l));
+		list = Arrays.asList(new Value[] {
+			whatever01Contact,
+		});
+		whatever01.getAttributes().add("members", new ValueSet(new HashSet<Value>(list), TypePrimitive.CONTACT));
+		whatever01.getAttributes().add("creation", new ValueTime("2012/10/18 07:03:00.000"));
+		whatever01.getAttributes().add("cpu_usage", new ValueDouble(0.1));
+		whatever01.getAttributes().add("num_cores", new ValueInt(7l));
+		list = Arrays.asList(new Value[] {
+			new ValueString("rewrite")
+		});
+		whatever01.getAttributes().add("php_modules", new ValueList(list, TypePrimitive.STRING));
+		
+		ZMI whatever02 = new ZMI(pjwstk);
+		pjwstk.addSon(whatever02);
+		whatever02.getAttributes().add("level", new ValueInt(2l));
+		whatever02.getAttributes().add("name", new ValueString("whatever02"));
+		whatever02.getAttributes().add("owner", new ValueString("/uw/whatever02"));
+		whatever02.getAttributes().add("timestamp", new ValueTime("2012/11/09 21:13:00.000"));
+		list = Arrays.asList(new Value[] {
+			khaki31Contact, whatever01Contact,
+		});
+		whatever02.getAttributes().add("contacts", new ValueSet(new HashSet<Value>(list), TypePrimitive.CONTACT));
+		whatever02.getAttributes().add("cardinality", new ValueInt(1l));
+		list = Arrays.asList(new Value[] {
+			whatever02Contact,
+		});
+		whatever02.getAttributes().add("members", new ValueSet(new HashSet<Value>(list), TypePrimitive.CONTACT));
+		whatever02.getAttributes().add("creation", new ValueTime("2012/10/18 07:04:00.000"));
+		whatever02.getAttributes().add("cpu_usage", new ValueDouble(0.4));
+		whatever02.getAttributes().add("num_cores", new ValueInt(13l));
+		list = Arrays.asList(new Value[] {
+			new ValueString("odbc")
+		});
+		whatever02.getAttributes().add("php_modules", new ValueList(list, TypePrimitive.STRING));
+		
+		return root;
+	}
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/NoSuchAttributeException.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/NoSuchAttributeException.java
new file mode 100644
index 0000000..b85438c
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/NoSuchAttributeException.java
@@ -0,0 +1,39 @@
+/**
+ * Copyright (c) 2014, University of Warsaw
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are permitted
+ * provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ * conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+ * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package pl.edu.mimuw.cloudatlas.interpreter;
+
+@SuppressWarnings("serial")
+public class NoSuchAttributeException extends InterpreterException {
+	private final String attribute;
+
+	protected NoSuchAttributeException(String attribute) {
+		super("Attribute " + attribute + " does not exist.");
+		this.attribute = attribute;
+	}
+
+	public String getAttribute() {
+		return attribute;
+	}
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/QueryResult.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/QueryResult.java
new file mode 100644
index 0000000..2fc0cce
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/QueryResult.java
@@ -0,0 +1,55 @@
+/**
+ * Copyright (c) 2014, University of Warsaw
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are permitted
+ * provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ * conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+ * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package pl.edu.mimuw.cloudatlas.interpreter;
+
+import pl.edu.mimuw.cloudatlas.model.Attribute;
+import pl.edu.mimuw.cloudatlas.model.Value;
+
+// immutable
+public class QueryResult {
+	private final Attribute name;
+	private final Value value;
+
+	public QueryResult(Attribute name, Value value) {
+		this.name = name;
+		this.value = value;
+	}
+
+	public QueryResult(Value value) {
+		this(null, value);
+	}
+
+	public Attribute getName() {
+		return name;
+	}
+
+	public Value getValue() {
+		return value;
+	}
+
+	public String toString() {
+		return name + ": " + value;
+	}
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/Result.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/Result.java
new file mode 100644
index 0000000..5afbe65
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/Result.java
@@ -0,0 +1,265 @@
+/**
+ * Copyright (c) 2014, University of Warsaw
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are permitted
+ * provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ * conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+ * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package pl.edu.mimuw.cloudatlas.interpreter;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import pl.edu.mimuw.cloudatlas.model.Type;
+import pl.edu.mimuw.cloudatlas.model.TypeCollection;
+import pl.edu.mimuw.cloudatlas.model.Value;
+import pl.edu.mimuw.cloudatlas.model.ValueList;
+
+abstract class Result {
+	public interface BinaryOperation {
+		public Value perform(Value v1, Value v2);
+	}
+
+	public interface UnaryOperation {
+		public Value perform(Value v);
+	}
+
+	public interface AggregationOperation {
+		public Value perform(ValueList values);
+	}
+
+	public interface TransformOperation {
+		public ValueList perform(ValueList values);
+	}
+
+	private static final BinaryOperation IS_EQUAL = new BinaryOperation() {
+		@Override
+		public Value perform(Value v1, Value v2) {
+			return v1.isEqual(v2);
+		}
+	};
+
+	private static final BinaryOperation IS_LOWER_THAN = new BinaryOperation() {
+		@Override
+		public Value perform(Value v1, Value v2) {
+			return v1.isLowerThan(v2);
+		}
+	};
+
+	private static final BinaryOperation ADD_VALUE = new BinaryOperation() {
+		@Override
+		public Value perform(Value v1, Value v2) {
+			return v1.addValue(v2);
+		}
+	};
+
+	private static final BinaryOperation SUBTRACT = new BinaryOperation() {
+		@Override
+		public Value perform(Value v1, Value v2) {
+			return v1.subtract(v2);
+		}
+	};
+
+	private static final BinaryOperation MULTIPLY = new BinaryOperation() {
+		@Override
+		public Value perform(Value v1, Value v2) {
+			return v1.multiply(v2);
+		}
+	};
+
+	private static final BinaryOperation DIVIDE = new BinaryOperation() {
+		@Override
+		public Value perform(Value v1, Value v2) {
+			return v1.divide(v2);
+		}
+	};
+
+	private static final BinaryOperation MODULO = new BinaryOperation() {
+		@Override
+		public Value perform(Value v1, Value v2) {
+			return v1.modulo(v2);
+		}
+	};
+
+	private static final BinaryOperation AND = new BinaryOperation() {
+		@Override
+		public Value perform(Value v1, Value v2) {
+			return v1.and(v2);
+		}
+	};
+
+	private static final BinaryOperation OR = new BinaryOperation() {
+		@Override
+		public Value perform(Value v1, Value v2) {
+			return v1.or(v2);
+		}
+	};
+
+	private static final BinaryOperation REG_EXPR = new BinaryOperation() {
+		@Override
+		public Value perform(Value v1, Value v2) {
+			return v1.regExpr(v2);
+		}
+	};
+
+	private static final UnaryOperation NEGATE = new UnaryOperation() {
+		@Override
+		public Value perform(Value v) {
+			return v.negate();
+		}
+	};
+
+	private static final UnaryOperation VALUE_SIZE = new UnaryOperation() {
+		@Override
+		public Value perform(Value v) {
+			return v.valueSize();
+		}
+	};
+
+	protected abstract Result binaryOperationTyped(BinaryOperation operation, ResultSingle right);
+
+	public Result binaryOperation(BinaryOperation operation, Result right) {
+		return right.callMe(operation, this);
+	}
+
+	public abstract Result unaryOperation(UnaryOperation operation);
+
+	protected abstract Result callMe(BinaryOperation operation, Result left);
+
+	public abstract Value getValue();
+
+	public abstract ValueList getList();
+
+	public abstract ValueList getColumn();
+
+	public ResultSingle aggregationOperation(AggregationOperation operation) {
+		// TODO
+		throw new UnsupportedOperationException("Not yet implemented");
+	}
+
+	public Result transformOperation(TransformOperation operation) {
+		// TODO
+		throw new UnsupportedOperationException("Not yet implemented");
+	}
+
+	public Result isEqual(Result right) {
+		return right.callMe(IS_EQUAL, this);
+	}
+
+	public Result isLowerThan(Result right) {
+		return right.callMe(IS_LOWER_THAN, this);
+	}
+
+	public Result addValue(Result right) {
+		return right.callMe(ADD_VALUE, this);
+	}
+
+	public Result subtract(Result right) {
+		return right.callMe(SUBTRACT, this);
+	}
+
+	public Result multiply(Result right) {
+		return right.callMe(MULTIPLY, this);
+	}
+
+	public Result divide(Result right) {
+		return right.callMe(DIVIDE, this);
+	}
+
+	public Result modulo(Result right) {
+		return right.callMe(MODULO, this);
+	}
+
+	public Result and(Result right) {
+		return right.callMe(AND, this);
+	}
+
+	public Result or(Result right) {
+		return right.callMe(OR, this);
+	}
+
+	public Result regExpr(Result right) {
+		return right.callMe(REG_EXPR, this);
+	}
+
+	public Result negate() {
+		return unaryOperation(NEGATE);
+	}
+
+	public Result valueSize() {
+		return unaryOperation(VALUE_SIZE);
+	}
+
+	protected static ValueList filterNullsList(ValueList list) {
+		List<Value> result = new ArrayList<Value>();
+		if(list.isEmpty())
+			return new ValueList(result, ((TypeCollection)list.getType()).getElementType());
+		for(Value v : list)
+			if(!v.isNull())
+				result.add(v);
+		return new ValueList(result.isEmpty()? null : result, ((TypeCollection)list.getType()).getElementType());
+	}
+
+	public abstract Result filterNulls();
+
+	protected static ValueList firstList(ValueList list, int size) {
+		ValueList nlist = filterNullsList(list);
+		if(nlist.getValue() == null)
+			return nlist;
+		List<Value> result = new ArrayList<Value>(size);
+		int i = 0;
+		for(Value v : nlist) {
+			result.add(v);
+			if(++i == size)
+				break;
+		}
+		return new ValueList(result, ((TypeCollection)list.getType()).getElementType());
+	}
+
+	public abstract Result first(int size);
+
+	protected static ValueList lastList(ValueList list, int size) {
+		ValueList nlist = filterNullsList(list);
+		if(nlist.getValue() == null)
+			return nlist;
+		List<Value> result = new ArrayList<Value>(size);
+		for(int i = Math.max(0, list.size() - size); i < list.size(); ++i)
+			result.add(list.get(i));
+		return new ValueList(result, ((TypeCollection)list.getType()).getElementType());
+	}
+
+	public abstract Result last(int size);
+
+	protected static ValueList randomList(ValueList list, int size) {
+		ValueList nlist = filterNullsList(list);
+		if(nlist.getValue() == null || list.size() <= size)
+			return nlist;
+		Collections.shuffle(nlist);
+		return new ValueList(nlist.getValue().subList(0, size), ((TypeCollection)list.getType()).getElementType());
+	}
+
+	public abstract Result random(int size);
+
+	public abstract Result convertTo(Type to);
+
+	public abstract ResultSingle isNull();
+
+	public abstract Type getType();
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/ResultSingle.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/ResultSingle.java
new file mode 100644
index 0000000..ada8f93
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/ResultSingle.java
@@ -0,0 +1,103 @@
+/**
+ * Copyright (c) 2014, University of Warsaw
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are permitted
+ * provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ * conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+ * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package pl.edu.mimuw.cloudatlas.interpreter;
+
+import pl.edu.mimuw.cloudatlas.model.Type;
+import pl.edu.mimuw.cloudatlas.model.Value;
+import pl.edu.mimuw.cloudatlas.model.ValueBoolean;
+import pl.edu.mimuw.cloudatlas.model.ValueList;
+
+class ResultSingle extends Result {
+	private final Value value;
+
+	public ResultSingle(Value value) {
+		this.value = value;
+	}
+	
+	@Override
+	protected ResultSingle binaryOperationTyped(BinaryOperation operation, ResultSingle right) {
+		return new ResultSingle(operation.perform(value, right.value));
+	}
+
+	@Override
+	public ResultSingle unaryOperation(UnaryOperation operation) {
+		return new ResultSingle(operation.perform(value));
+	}
+
+	@Override
+	protected Result callMe(BinaryOperation operation, Result left) {
+		return left.binaryOperationTyped(operation, this);
+	}
+
+	@Override
+	public Value getValue() {
+		return value;
+	}
+
+	@Override
+	public ValueList getList() {
+		throw new UnsupportedOperationException("Not a ResultList.");
+	}
+
+	@Override
+	public ValueList getColumn() {
+		throw new UnsupportedOperationException("Not a ResultColumn.");
+	}
+
+	@Override
+	public Result filterNulls() {
+		throw new UnsupportedOperationException("Operation filterNulls not supported on ResultSingle.");
+	}
+
+	@Override
+	public Result first(int size) {
+		throw new UnsupportedOperationException("Operation first not supported on ResultSingle.");
+	}
+
+	@Override
+	public Result last(int size) {
+		throw new UnsupportedOperationException("Operation last not supported on ResultSingle.");
+	}
+
+	@Override
+	public Result random(int size) {
+		throw new UnsupportedOperationException("Operation random not supported on ResultSingle.");
+	}
+
+	@Override
+	public ResultSingle convertTo(Type to) {
+		return new ResultSingle(value.convertTo(to));
+	}
+
+	@Override
+	public ResultSingle isNull() {
+		return new ResultSingle(new ValueBoolean(value.isNull()));
+	}
+
+	@Override
+	public Type getType() {
+		return value.getType();
+	}
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/Table.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/Table.java
new file mode 100644
index 0000000..9f2e1d9
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/Table.java
@@ -0,0 +1,123 @@
+/**
+ * Copyright (c) 2014, University of Warsaw
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are permitted
+ * provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ * conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+ * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package pl.edu.mimuw.cloudatlas.interpreter;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.Map.Entry;
+
+import pl.edu.mimuw.cloudatlas.model.Attribute;
+import pl.edu.mimuw.cloudatlas.model.Type;
+import pl.edu.mimuw.cloudatlas.model.TypeCollection;
+import pl.edu.mimuw.cloudatlas.model.Value;
+import pl.edu.mimuw.cloudatlas.model.ValueList;
+import pl.edu.mimuw.cloudatlas.model.ValueNull;
+import pl.edu.mimuw.cloudatlas.model.ZMI;
+
+public class Table implements Iterable<TableRow> {
+	private final List<String> columns = new ArrayList<String>();
+	private final Map<String, Integer> headersMap = new HashMap<String, Integer>();
+	private final List<TableRow> rows = new ArrayList<TableRow>();
+
+	// creates whole table based on a given ZMI
+	public Table(ZMI zmi) {
+		Set<String> allColumns = new HashSet<String>();
+		for(ZMI z : zmi.getSons())
+			for(Entry<Attribute, Value> e : z.getAttributes())
+				allColumns.add(e.getKey().getName());
+
+		columns.addAll(allColumns);
+		int i = 0;
+		for(String c : columns)
+			headersMap.put(c, i++);
+		for(ZMI z : zmi.getSons()) {
+			Value[] row = new Value[columns.size()];
+			for(int j = 0; j < row.length; ++j)
+				row[j] = ValueNull.getInstance();
+			for(Entry<Attribute, Value> e : z.getAttributes())
+				row[getColumnIndex(e.getKey().getName())] = e.getValue();
+			appendRow(new TableRow(row));
+		}
+	}
+
+	// creates an empty table with same columns as given
+	public Table(Table table) {
+		this.columns.addAll(table.columns);
+		this.headersMap.putAll(table.headersMap);
+	}
+
+	public List<String> getColumns() {
+		return Collections.unmodifiableList(columns);
+	}
+
+	public void appendRow(TableRow row) {
+		if(row.getSize() != columns.size())
+			throw new InternalInterpreterException("Cannot append row. Length expected: " + columns.size() + ", got: "
+					+ row.getSize() + ".");
+		rows.add(row);
+	}
+
+	public int getColumnIndex(String column) {
+		try {
+			return headersMap.get(column).intValue();
+		} catch(NullPointerException exception) {
+			throw new NoSuchAttributeException(column);
+		}
+	}
+
+	public ValueList getColumn(String column) {
+		if(column.startsWith("&")) {
+			throw new NoSuchAttributeException(column);
+		}
+		try {
+			int position = headersMap.get(column);
+			List<Value> result = new ArrayList<Value>();
+			for(TableRow row : rows) {
+				Value v = row.getIth(position);
+				result.add(v);
+			}
+			Type elementType = TypeCollection.computeElementType(result);
+			return new ValueList(result, elementType);
+		} catch(NullPointerException exception) {
+			throw new NoSuchAttributeException(column);
+		}
+	}
+
+	@Override
+	public Iterator<TableRow> iterator() {
+		return rows.iterator();
+	}
+
+	public void sort(Comparator<TableRow> comparator) {
+		Collections.sort(rows, comparator);
+	}
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/TableRow.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/TableRow.java
new file mode 100644
index 0000000..23fd2dd
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/TableRow.java
@@ -0,0 +1,46 @@
+/**
+ * Copyright (c) 2014, University of Warsaw
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are permitted
+ * provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ * conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+ * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package pl.edu.mimuw.cloudatlas.interpreter;
+
+import java.util.Arrays;
+
+import pl.edu.mimuw.cloudatlas.model.Value;
+
+// immutable
+public class TableRow {
+	private final Value[] columns;
+
+	public TableRow(Value[] values) {
+		this.columns = Arrays.copyOf(values, values.length);
+	}
+
+	public int getSize() {
+		return columns.length;
+	}
+
+	public Value getIth(int i) {
+		return columns[i];
+	}
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/AliasedSelItemC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/AliasedSelItemC.java
new file mode 100644
index 0000000..f1f1b5a
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/AliasedSelItemC.java
@@ -0,0 +1,25 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class AliasedSelItemC extends SelItem {
+  public final CondExpr condexpr_;
+  public final String qident_;
+
+  public AliasedSelItemC(CondExpr p1, String p2) { condexpr_ = p1; qident_ = p2; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItem.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.AliasedSelItemC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.AliasedSelItemC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.AliasedSelItemC)o;
+      return this.condexpr_.equals(x.condexpr_) && this.qident_.equals(x.qident_);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37*(this.condexpr_.hashCode())+this.qident_.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/AscOrderC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/AscOrderC.java
new file mode 100644
index 0000000..80163bb
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/AscOrderC.java
@@ -0,0 +1,22 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class AscOrderC extends Order {
+
+  public AscOrderC() { }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Order.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.AscOrderC) {
+      return true;
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37;
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BasicExpr.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BasicExpr.java
new file mode 100644
index 0000000..c098b14
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BasicExpr.java
@@ -0,0 +1,23 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public abstract class BasicExpr implements java.io.Serializable {
+  public abstract <R,A> R accept(BasicExpr.Visitor<R,A> v, A arg);
+  public interface Visitor <R,A> {
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprAddC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprSubC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprMulC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprDivC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprModC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprNegC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EBoolC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EIdentC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EFunC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EStrC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EIntC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EDblC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ECondExprC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EStmtC p, A arg);
+
+  }
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BasicExprAddC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BasicExprAddC.java
new file mode 100644
index 0000000..754839a
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BasicExprAddC.java
@@ -0,0 +1,24 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class BasicExprAddC extends BasicExpr {
+  public final BasicExpr basicexpr_1, basicexpr_2;
+
+  public BasicExprAddC(BasicExpr p1, BasicExpr p2) { basicexpr_1 = p1; basicexpr_2 = p2; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprAddC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprAddC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprAddC)o;
+      return this.basicexpr_1.equals(x.basicexpr_1) && this.basicexpr_2.equals(x.basicexpr_2);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37*(this.basicexpr_1.hashCode())+this.basicexpr_2.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BasicExprDivC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BasicExprDivC.java
new file mode 100644
index 0000000..8abd22a
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BasicExprDivC.java
@@ -0,0 +1,24 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class BasicExprDivC extends BasicExpr {
+  public final BasicExpr basicexpr_1, basicexpr_2;
+
+  public BasicExprDivC(BasicExpr p1, BasicExpr p2) { basicexpr_1 = p1; basicexpr_2 = p2; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprDivC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprDivC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprDivC)o;
+      return this.basicexpr_1.equals(x.basicexpr_1) && this.basicexpr_2.equals(x.basicexpr_2);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37*(this.basicexpr_1.hashCode())+this.basicexpr_2.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BasicExprModC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BasicExprModC.java
new file mode 100644
index 0000000..db90b89
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BasicExprModC.java
@@ -0,0 +1,24 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class BasicExprModC extends BasicExpr {
+  public final BasicExpr basicexpr_1, basicexpr_2;
+
+  public BasicExprModC(BasicExpr p1, BasicExpr p2) { basicexpr_1 = p1; basicexpr_2 = p2; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprModC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprModC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprModC)o;
+      return this.basicexpr_1.equals(x.basicexpr_1) && this.basicexpr_2.equals(x.basicexpr_2);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37*(this.basicexpr_1.hashCode())+this.basicexpr_2.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BasicExprMulC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BasicExprMulC.java
new file mode 100644
index 0000000..369c545
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BasicExprMulC.java
@@ -0,0 +1,24 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class BasicExprMulC extends BasicExpr {
+  public final BasicExpr basicexpr_1, basicexpr_2;
+
+  public BasicExprMulC(BasicExpr p1, BasicExpr p2) { basicexpr_1 = p1; basicexpr_2 = p2; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprMulC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprMulC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprMulC)o;
+      return this.basicexpr_1.equals(x.basicexpr_1) && this.basicexpr_2.equals(x.basicexpr_2);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37*(this.basicexpr_1.hashCode())+this.basicexpr_2.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BasicExprNegC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BasicExprNegC.java
new file mode 100644
index 0000000..6abb7c4
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BasicExprNegC.java
@@ -0,0 +1,24 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class BasicExprNegC extends BasicExpr {
+  public final BasicExpr basicexpr_;
+
+  public BasicExprNegC(BasicExpr p1) { basicexpr_ = p1; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprNegC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprNegC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprNegC)o;
+      return this.basicexpr_.equals(x.basicexpr_);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return this.basicexpr_.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BasicExprSubC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BasicExprSubC.java
new file mode 100644
index 0000000..7f3bc58
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BasicExprSubC.java
@@ -0,0 +1,24 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class BasicExprSubC extends BasicExpr {
+  public final BasicExpr basicexpr_1, basicexpr_2;
+
+  public BasicExprSubC(BasicExpr p1, BasicExpr p2) { basicexpr_1 = p1; basicexpr_2 = p2; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprSubC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprSubC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprSubC)o;
+      return this.basicexpr_1.equals(x.basicexpr_1) && this.basicexpr_2.equals(x.basicexpr_2);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37*(this.basicexpr_1.hashCode())+this.basicexpr_2.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BoolExpr.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BoolExpr.java
new file mode 100644
index 0000000..b470b34
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BoolExpr.java
@@ -0,0 +1,12 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public abstract class BoolExpr implements java.io.Serializable {
+  public abstract <R,A> R accept(BoolExpr.Visitor<R,A> v, A arg);
+  public interface Visitor <R,A> {
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprCmpC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprRegExpC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprBasicExprC p, A arg);
+
+  }
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BoolExprBasicExprC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BoolExprBasicExprC.java
new file mode 100644
index 0000000..eb08bcf
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BoolExprBasicExprC.java
@@ -0,0 +1,24 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class BoolExprBasicExprC extends BoolExpr {
+  public final BasicExpr basicexpr_;
+
+  public BoolExprBasicExprC(BasicExpr p1) { basicexpr_ = p1; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExpr.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprBasicExprC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprBasicExprC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprBasicExprC)o;
+      return this.basicexpr_.equals(x.basicexpr_);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return this.basicexpr_.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BoolExprCmpC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BoolExprCmpC.java
new file mode 100644
index 0000000..f8a2f21
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BoolExprCmpC.java
@@ -0,0 +1,25 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class BoolExprCmpC extends BoolExpr {
+  public final BasicExpr basicexpr_1, basicexpr_2;
+  public final RelOp relop_;
+
+  public BoolExprCmpC(BasicExpr p1, RelOp p2, BasicExpr p3) { basicexpr_1 = p1; relop_ = p2; basicexpr_2 = p3; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExpr.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprCmpC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprCmpC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprCmpC)o;
+      return this.basicexpr_1.equals(x.basicexpr_1) && this.relop_.equals(x.relop_) && this.basicexpr_2.equals(x.basicexpr_2);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37*(37*(this.basicexpr_1.hashCode())+this.relop_.hashCode())+this.basicexpr_2.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BoolExprRegExpC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BoolExprRegExpC.java
new file mode 100644
index 0000000..31af2d2
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/BoolExprRegExpC.java
@@ -0,0 +1,25 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class BoolExprRegExpC extends BoolExpr {
+  public final BasicExpr basicexpr_;
+  public final String string_;
+
+  public BoolExprRegExpC(BasicExpr p1, String p2) { basicexpr_ = p1; string_ = p2; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExpr.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprRegExpC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprRegExpC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprRegExpC)o;
+      return this.basicexpr_.equals(x.basicexpr_) && this.string_.equals(x.string_);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37*(this.basicexpr_.hashCode())+this.string_.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/CondExpr.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/CondExpr.java
new file mode 100644
index 0000000..73136e7
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/CondExpr.java
@@ -0,0 +1,13 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public abstract class CondExpr implements java.io.Serializable {
+  public abstract <R,A> R accept(CondExpr.Visitor<R,A> v, A arg);
+  public interface Visitor <R,A> {
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprOrC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprAndC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprNotC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprBoolExprC p, A arg);
+
+  }
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/CondExprAndC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/CondExprAndC.java
new file mode 100644
index 0000000..094affb
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/CondExprAndC.java
@@ -0,0 +1,24 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class CondExprAndC extends CondExpr {
+  public final CondExpr condexpr_1, condexpr_2;
+
+  public CondExprAndC(CondExpr p1, CondExpr p2) { condexpr_1 = p1; condexpr_2 = p2; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprAndC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprAndC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprAndC)o;
+      return this.condexpr_1.equals(x.condexpr_1) && this.condexpr_2.equals(x.condexpr_2);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37*(this.condexpr_1.hashCode())+this.condexpr_2.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/CondExprBoolExprC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/CondExprBoolExprC.java
new file mode 100644
index 0000000..d102a29
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/CondExprBoolExprC.java
@@ -0,0 +1,24 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class CondExprBoolExprC extends CondExpr {
+  public final BoolExpr boolexpr_;
+
+  public CondExprBoolExprC(BoolExpr p1) { boolexpr_ = p1; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprBoolExprC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprBoolExprC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprBoolExprC)o;
+      return this.boolexpr_.equals(x.boolexpr_);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return this.boolexpr_.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/CondExprNotC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/CondExprNotC.java
new file mode 100644
index 0000000..1e84219
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/CondExprNotC.java
@@ -0,0 +1,24 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class CondExprNotC extends CondExpr {
+  public final CondExpr condexpr_;
+
+  public CondExprNotC(CondExpr p1) { condexpr_ = p1; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprNotC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprNotC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprNotC)o;
+      return this.condexpr_.equals(x.condexpr_);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return this.condexpr_.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/CondExprOrC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/CondExprOrC.java
new file mode 100644
index 0000000..08e7484
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/CondExprOrC.java
@@ -0,0 +1,24 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class CondExprOrC extends CondExpr {
+  public final CondExpr condexpr_1, condexpr_2;
+
+  public CondExprOrC(CondExpr p1, CondExpr p2) { condexpr_1 = p1; condexpr_2 = p2; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprOrC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprOrC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprOrC)o;
+      return this.condexpr_1.equals(x.condexpr_1) && this.condexpr_2.equals(x.condexpr_2);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37*(this.condexpr_1.hashCode())+this.condexpr_2.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/DescOrderC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/DescOrderC.java
new file mode 100644
index 0000000..a08cc61
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/DescOrderC.java
@@ -0,0 +1,22 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class DescOrderC extends Order {
+
+  public DescOrderC() { }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Order.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.DescOrderC) {
+      return true;
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37;
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/EBoolC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/EBoolC.java
new file mode 100644
index 0000000..da55dd5
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/EBoolC.java
@@ -0,0 +1,24 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class EBoolC extends BasicExpr {
+  public final String qbool_;
+
+  public EBoolC(String p1) { qbool_ = p1; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EBoolC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EBoolC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EBoolC)o;
+      return this.qbool_.equals(x.qbool_);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return this.qbool_.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/ECondExprC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/ECondExprC.java
new file mode 100644
index 0000000..db4e9f1
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/ECondExprC.java
@@ -0,0 +1,24 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class ECondExprC extends BasicExpr {
+  public final CondExpr condexpr_;
+
+  public ECondExprC(CondExpr p1) { condexpr_ = p1; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ECondExprC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ECondExprC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ECondExprC)o;
+      return this.condexpr_.equals(x.condexpr_);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return this.condexpr_.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/EDblC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/EDblC.java
new file mode 100644
index 0000000..f07e616
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/EDblC.java
@@ -0,0 +1,24 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class EDblC extends BasicExpr {
+  public final String qdouble_;
+
+  public EDblC(String p1) { qdouble_ = p1; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EDblC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EDblC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EDblC)o;
+      return this.qdouble_.equals(x.qdouble_);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return this.qdouble_.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/EFunC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/EFunC.java
new file mode 100644
index 0000000..93af7e9
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/EFunC.java
@@ -0,0 +1,25 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class EFunC extends BasicExpr {
+  public final String qident_;
+  public final ListCondExpr listcondexpr_;
+
+  public EFunC(String p1, ListCondExpr p2) { qident_ = p1; listcondexpr_ = p2; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EFunC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EFunC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EFunC)o;
+      return this.qident_.equals(x.qident_) && this.listcondexpr_.equals(x.listcondexpr_);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37*(this.qident_.hashCode())+this.listcondexpr_.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/EIdentC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/EIdentC.java
new file mode 100644
index 0000000..7c4119d
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/EIdentC.java
@@ -0,0 +1,24 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class EIdentC extends BasicExpr {
+  public final String qident_;
+
+  public EIdentC(String p1) { qident_ = p1; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EIdentC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EIdentC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EIdentC)o;
+      return this.qident_.equals(x.qident_);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return this.qident_.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/EIntC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/EIntC.java
new file mode 100644
index 0000000..069ecdb
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/EIntC.java
@@ -0,0 +1,24 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class EIntC extends BasicExpr {
+  public final String qinteger_;
+
+  public EIntC(String p1) { qinteger_ = p1; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EIntC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EIntC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EIntC)o;
+      return this.qinteger_.equals(x.qinteger_);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return this.qinteger_.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/EStmtC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/EStmtC.java
new file mode 100644
index 0000000..4157f1e
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/EStmtC.java
@@ -0,0 +1,24 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class EStmtC extends BasicExpr {
+  public final Statement statement_;
+
+  public EStmtC(Statement p1) { statement_ = p1; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EStmtC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EStmtC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EStmtC)o;
+      return this.statement_.equals(x.statement_);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return this.statement_.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/EStrC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/EStrC.java
new file mode 100644
index 0000000..3bf4a75
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/EStrC.java
@@ -0,0 +1,24 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class EStrC extends BasicExpr {
+  public final String string_;
+
+  public EStrC(String p1) { string_ = p1; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EStrC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EStrC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EStrC)o;
+      return this.string_.equals(x.string_);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return this.string_.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/ListCondExpr.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/ListCondExpr.java
new file mode 100644
index 0000000..929ff07
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/ListCondExpr.java
@@ -0,0 +1,4 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class ListCondExpr extends java.util.LinkedList<CondExpr> {
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/ListOrderItem.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/ListOrderItem.java
new file mode 100644
index 0000000..47ba4a8
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/ListOrderItem.java
@@ -0,0 +1,4 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class ListOrderItem extends java.util.LinkedList<OrderItem> {
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/ListSelItem.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/ListSelItem.java
new file mode 100644
index 0000000..5392851
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/ListSelItem.java
@@ -0,0 +1,4 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class ListSelItem extends java.util.LinkedList<SelItem> {
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/ListStatement.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/ListStatement.java
new file mode 100644
index 0000000..fa5070a
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/ListStatement.java
@@ -0,0 +1,4 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class ListStatement extends java.util.LinkedList<Statement> {
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/NoNullsC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/NoNullsC.java
new file mode 100644
index 0000000..c7f54c9
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/NoNullsC.java
@@ -0,0 +1,22 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class NoNullsC extends Nulls {
+
+  public NoNullsC() { }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Nulls.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NoNullsC) {
+      return true;
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37;
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/NoOrderByC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/NoOrderByC.java
new file mode 100644
index 0000000..d357bcd
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/NoOrderByC.java
@@ -0,0 +1,22 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class NoOrderByC extends OrderBy {
+
+  public NoOrderByC() { }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderBy.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NoOrderByC) {
+      return true;
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37;
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/NoOrderC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/NoOrderC.java
new file mode 100644
index 0000000..0888840
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/NoOrderC.java
@@ -0,0 +1,22 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class NoOrderC extends Order {
+
+  public NoOrderC() { }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Order.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NoOrderC) {
+      return true;
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37;
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/NoWhereC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/NoWhereC.java
new file mode 100644
index 0000000..725fe03
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/NoWhereC.java
@@ -0,0 +1,22 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class NoWhereC extends Where {
+
+  public NoWhereC() { }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Where.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NoWhereC) {
+      return true;
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37;
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/NullFirstsC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/NullFirstsC.java
new file mode 100644
index 0000000..fa837b1
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/NullFirstsC.java
@@ -0,0 +1,22 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class NullFirstsC extends Nulls {
+
+  public NullFirstsC() { }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Nulls.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NullFirstsC) {
+      return true;
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37;
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/Nulls.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/Nulls.java
new file mode 100644
index 0000000..fbd153b
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/Nulls.java
@@ -0,0 +1,12 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public abstract class Nulls implements java.io.Serializable {
+  public abstract <R,A> R accept(Nulls.Visitor<R,A> v, A arg);
+  public interface Visitor <R,A> {
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NoNullsC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NullFirstsC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NullsLastC p, A arg);
+
+  }
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/NullsLastC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/NullsLastC.java
new file mode 100644
index 0000000..fcf0e74
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/NullsLastC.java
@@ -0,0 +1,22 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class NullsLastC extends Nulls {
+
+  public NullsLastC() { }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Nulls.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NullsLastC) {
+      return true;
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37;
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/Order.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/Order.java
new file mode 100644
index 0000000..bd7094c
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/Order.java
@@ -0,0 +1,12 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public abstract class Order implements java.io.Serializable {
+  public abstract <R,A> R accept(Order.Visitor<R,A> v, A arg);
+  public interface Visitor <R,A> {
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.AscOrderC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.DescOrderC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NoOrderC p, A arg);
+
+  }
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/OrderBy.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/OrderBy.java
new file mode 100644
index 0000000..c136dc4
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/OrderBy.java
@@ -0,0 +1,11 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public abstract class OrderBy implements java.io.Serializable {
+  public abstract <R,A> R accept(OrderBy.Visitor<R,A> v, A arg);
+  public interface Visitor <R,A> {
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NoOrderByC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderByC p, A arg);
+
+  }
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/OrderByC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/OrderByC.java
new file mode 100644
index 0000000..e599401
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/OrderByC.java
@@ -0,0 +1,24 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class OrderByC extends OrderBy {
+  public final ListOrderItem listorderitem_;
+
+  public OrderByC(ListOrderItem p1) { listorderitem_ = p1; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderBy.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderByC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderByC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderByC)o;
+      return this.listorderitem_.equals(x.listorderitem_);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return this.listorderitem_.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/OrderItem.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/OrderItem.java
new file mode 100644
index 0000000..3ea76ff
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/OrderItem.java
@@ -0,0 +1,10 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public abstract class OrderItem implements java.io.Serializable {
+  public abstract <R,A> R accept(OrderItem.Visitor<R,A> v, A arg);
+  public interface Visitor <R,A> {
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderItemC p, A arg);
+
+  }
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/OrderItemC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/OrderItemC.java
new file mode 100644
index 0000000..2d6228b
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/OrderItemC.java
@@ -0,0 +1,26 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class OrderItemC extends OrderItem {
+  public final CondExpr condexpr_;
+  public final Order order_;
+  public final Nulls nulls_;
+
+  public OrderItemC(CondExpr p1, Order p2, Nulls p3) { condexpr_ = p1; order_ = p2; nulls_ = p3; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderItem.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderItemC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderItemC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderItemC)o;
+      return this.condexpr_.equals(x.condexpr_) && this.order_.equals(x.order_) && this.nulls_.equals(x.nulls_);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37*(37*(this.condexpr_.hashCode())+this.order_.hashCode())+this.nulls_.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/Program.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/Program.java
new file mode 100644
index 0000000..4332025
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/Program.java
@@ -0,0 +1,10 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public abstract class Program implements java.io.Serializable {
+  public abstract <R,A> R accept(Program.Visitor<R,A> v, A arg);
+  public interface Visitor <R,A> {
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ProgramC p, A arg);
+
+  }
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/ProgramC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/ProgramC.java
new file mode 100644
index 0000000..6b7e999
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/ProgramC.java
@@ -0,0 +1,24 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class ProgramC extends Program {
+  public final ListStatement liststatement_;
+
+  public ProgramC(ListStatement p1) { liststatement_ = p1; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Program.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ProgramC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ProgramC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ProgramC)o;
+      return this.liststatement_.equals(x.liststatement_);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return this.liststatement_.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/RelOp.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/RelOp.java
new file mode 100644
index 0000000..f35b2dd
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/RelOp.java
@@ -0,0 +1,15 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public abstract class RelOp implements java.io.Serializable {
+  public abstract <R,A> R accept(RelOp.Visitor<R,A> v, A arg);
+  public interface Visitor <R,A> {
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpGtC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpEqC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpNeC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpLtC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpLeC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpGeC p, A arg);
+
+  }
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/RelOpEqC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/RelOpEqC.java
new file mode 100644
index 0000000..f0fe3a2
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/RelOpEqC.java
@@ -0,0 +1,22 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class RelOpEqC extends RelOp {
+
+  public RelOpEqC() { }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOp.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpEqC) {
+      return true;
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37;
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/RelOpGeC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/RelOpGeC.java
new file mode 100644
index 0000000..e0498bc
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/RelOpGeC.java
@@ -0,0 +1,22 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class RelOpGeC extends RelOp {
+
+  public RelOpGeC() { }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOp.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpGeC) {
+      return true;
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37;
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/RelOpGtC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/RelOpGtC.java
new file mode 100644
index 0000000..45c10b6
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/RelOpGtC.java
@@ -0,0 +1,22 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class RelOpGtC extends RelOp {
+
+  public RelOpGtC() { }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOp.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpGtC) {
+      return true;
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37;
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/RelOpLeC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/RelOpLeC.java
new file mode 100644
index 0000000..a0de97a
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/RelOpLeC.java
@@ -0,0 +1,22 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class RelOpLeC extends RelOp {
+
+  public RelOpLeC() { }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOp.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpLeC) {
+      return true;
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37;
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/RelOpLtC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/RelOpLtC.java
new file mode 100644
index 0000000..0407ab6
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/RelOpLtC.java
@@ -0,0 +1,22 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class RelOpLtC extends RelOp {
+
+  public RelOpLtC() { }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOp.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpLtC) {
+      return true;
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37;
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/RelOpNeC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/RelOpNeC.java
new file mode 100644
index 0000000..fc19670
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/RelOpNeC.java
@@ -0,0 +1,22 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class RelOpNeC extends RelOp {
+
+  public RelOpNeC() { }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOp.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpNeC) {
+      return true;
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37;
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/SelItem.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/SelItem.java
new file mode 100644
index 0000000..d1c5552
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/SelItem.java
@@ -0,0 +1,11 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public abstract class SelItem implements java.io.Serializable {
+  public abstract <R,A> R accept(SelItem.Visitor<R,A> v, A arg);
+  public interface Visitor <R,A> {
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItemC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.AliasedSelItemC p, A arg);
+
+  }
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/SelItemC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/SelItemC.java
new file mode 100644
index 0000000..f8fc8a4
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/SelItemC.java
@@ -0,0 +1,24 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class SelItemC extends SelItem {
+  public final CondExpr condexpr_;
+
+  public SelItemC(CondExpr p1) { condexpr_ = p1; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItem.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItemC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItemC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItemC)o;
+      return this.condexpr_.equals(x.condexpr_);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return this.condexpr_.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/Statement.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/Statement.java
new file mode 100644
index 0000000..8f6e252
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/Statement.java
@@ -0,0 +1,10 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public abstract class Statement implements java.io.Serializable {
+  public abstract <R,A> R accept(Statement.Visitor<R,A> v, A arg);
+  public interface Visitor <R,A> {
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.StatementC p, A arg);
+
+  }
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/StatementC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/StatementC.java
new file mode 100644
index 0000000..fd097fd
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/StatementC.java
@@ -0,0 +1,26 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class StatementC extends Statement {
+  public final ListSelItem listselitem_;
+  public final Where where_;
+  public final OrderBy orderby_;
+
+  public StatementC(ListSelItem p1, Where p2, OrderBy p3) { listselitem_ = p1; where_ = p2; orderby_ = p3; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Statement.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.StatementC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.StatementC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.StatementC)o;
+      return this.listselitem_.equals(x.listselitem_) && this.where_.equals(x.where_) && this.orderby_.equals(x.orderby_);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return 37*(37*(this.listselitem_.hashCode())+this.where_.hashCode())+this.orderby_.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/Where.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/Where.java
new file mode 100644
index 0000000..0c21d98
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/Where.java
@@ -0,0 +1,11 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public abstract class Where implements java.io.Serializable {
+  public abstract <R,A> R accept(Where.Visitor<R,A> v, A arg);
+  public interface Visitor <R,A> {
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NoWhereC p, A arg);
+    public R visit(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.WhereC p, A arg);
+
+  }
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/WhereC.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/WhereC.java
new file mode 100644
index 0000000..c068881
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Absyn/WhereC.java
@@ -0,0 +1,24 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query.Absyn; // Java Package generated by the BNF Converter.
+
+public class WhereC extends Where {
+  public final CondExpr condexpr_;
+
+  public WhereC(CondExpr p1) { condexpr_ = p1; }
+
+  public <R,A> R accept(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Where.Visitor<R,A> v, A arg) { return v.visit(this, arg); }
+
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.WhereC) {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.WhereC x = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.WhereC)o;
+      return this.condexpr_.equals(x.condexpr_);
+    }
+    return false;
+  }
+
+  public int hashCode() {
+    return this.condexpr_.hashCode();
+  }
+
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/PrettyPrinter.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/PrettyPrinter.java
new file mode 100644
index 0000000..ed1276d
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/PrettyPrinter.java
@@ -0,0 +1,1142 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query;
+import pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.*;
+
+public class PrettyPrinter
+{
+  //For certain applications increasing the initial size of the buffer may improve performance.
+  private static final int INITIAL_BUFFER_SIZE = 128;
+  //You may wish to change the parentheses used in precedence.
+  private static final String _L_PAREN = new String("(");
+  private static final String _R_PAREN = new String(")");
+  //You may wish to change render
+  private static void render(String s)
+  {
+    if (s.equals("{"))
+    {
+       buf_.append("\n");
+       indent();
+       buf_.append(s);
+       _n_ = _n_ + 2;
+       buf_.append("\n");
+       indent();
+    }
+    else if (s.equals("(") || s.equals("["))
+       buf_.append(s);
+    else if (s.equals(")") || s.equals("]"))
+    {
+       backup();
+       buf_.append(s);
+       buf_.append(" ");
+    }
+    else if (s.equals("}"))
+    {
+       _n_ = _n_ - 2;
+       backup();
+       backup();
+       buf_.append(s);
+       buf_.append("\n");
+       indent();
+    }
+    else if (s.equals(","))
+    {
+       backup();
+       buf_.append(s);
+       buf_.append(" ");
+    }
+    else if (s.equals(";"))
+    {
+       backup();
+       buf_.append(s);
+       buf_.append("\n");
+       indent();
+    }
+    else if (s.equals("")) return;
+    else
+    {
+       buf_.append(s);
+       buf_.append(" ");
+    }
+  }
+
+
+  //  print and show methods are defined for each category.
+  public static String print(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListStatement foo)
+  {
+    pp(foo, 0);
+    trim();
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String show(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListStatement foo)
+  {
+    sh(foo);
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String print(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListOrderItem foo)
+  {
+    pp(foo, 0);
+    trim();
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String show(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListOrderItem foo)
+  {
+    sh(foo);
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String print(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListSelItem foo)
+  {
+    pp(foo, 0);
+    trim();
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String show(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListSelItem foo)
+  {
+    sh(foo);
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String print(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListCondExpr foo)
+  {
+    pp(foo, 0);
+    trim();
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String show(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListCondExpr foo)
+  {
+    sh(foo);
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String print(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Program foo)
+  {
+    pp(foo, 0);
+    trim();
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String show(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Program foo)
+  {
+    sh(foo);
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String print(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Statement foo)
+  {
+    pp(foo, 0);
+    trim();
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String show(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Statement foo)
+  {
+    sh(foo);
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String print(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Where foo)
+  {
+    pp(foo, 0);
+    trim();
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String show(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Where foo)
+  {
+    sh(foo);
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String print(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderBy foo)
+  {
+    pp(foo, 0);
+    trim();
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String show(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderBy foo)
+  {
+    sh(foo);
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String print(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderItem foo)
+  {
+    pp(foo, 0);
+    trim();
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String show(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderItem foo)
+  {
+    sh(foo);
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String print(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Order foo)
+  {
+    pp(foo, 0);
+    trim();
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String show(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Order foo)
+  {
+    sh(foo);
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String print(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Nulls foo)
+  {
+    pp(foo, 0);
+    trim();
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String show(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Nulls foo)
+  {
+    sh(foo);
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String print(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItem foo)
+  {
+    pp(foo, 0);
+    trim();
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String show(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItem foo)
+  {
+    sh(foo);
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String print(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExpr foo)
+  {
+    pp(foo, 0);
+    trim();
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String show(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExpr foo)
+  {
+    sh(foo);
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String print(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr foo)
+  {
+    pp(foo, 0);
+    trim();
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String show(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr foo)
+  {
+    sh(foo);
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String print(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr foo)
+  {
+    pp(foo, 0);
+    trim();
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String show(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr foo)
+  {
+    sh(foo);
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String print(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOp foo)
+  {
+    pp(foo, 0);
+    trim();
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  public static String show(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOp foo)
+  {
+    sh(foo);
+    String temp = buf_.toString();
+    buf_.delete(0,buf_.length());
+    return temp;
+  }
+  /***   You shouldn't need to change anything beyond this point.   ***/
+
+  private static void pp(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListStatement foo, int _i_)
+  {
+     for (java.util.Iterator<Statement> it = foo.iterator(); it.hasNext();)
+     {
+       pp(it.next(), 0);
+       if (it.hasNext()) {
+         render(";");
+       } else {
+         render("");
+       }
+     }
+  }
+
+  private static void pp(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListOrderItem foo, int _i_)
+  {
+     for (java.util.Iterator<OrderItem> it = foo.iterator(); it.hasNext();)
+     {
+       pp(it.next(), 0);
+       if (it.hasNext()) {
+         render(",");
+       } else {
+         render("");
+       }
+     }
+  }
+
+  private static void pp(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListSelItem foo, int _i_)
+  {
+     for (java.util.Iterator<SelItem> it = foo.iterator(); it.hasNext();)
+     {
+       pp(it.next(), 0);
+       if (it.hasNext()) {
+         render(",");
+       } else {
+         render("");
+       }
+     }
+  }
+
+  private static void pp(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListCondExpr foo, int _i_)
+  {
+     for (java.util.Iterator<CondExpr> it = foo.iterator(); it.hasNext();)
+     {
+       pp(it.next(), 0);
+       if (it.hasNext()) {
+         render(",");
+       } else {
+         render("");
+       }
+     }
+  }
+
+  private static void pp(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Program foo, int _i_)
+  {
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ProgramC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ProgramC _programc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ProgramC) foo;
+       if (_i_ > 0) render(_L_PAREN);
+       pp(_programc.liststatement_, 0);
+       if (_i_ > 0) render(_R_PAREN);
+    }
+  }
+
+  private static void pp(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Statement foo, int _i_)
+  {
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.StatementC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.StatementC _statementc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.StatementC) foo;
+       if (_i_ > 0) render(_L_PAREN);
+       render("SELECT");
+       pp(_statementc.listselitem_, 0);
+       pp(_statementc.where_, 0);
+       pp(_statementc.orderby_, 0);
+       if (_i_ > 0) render(_R_PAREN);
+    }
+  }
+
+  private static void pp(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Where foo, int _i_)
+  {
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NoWhereC)
+    {
+       if (_i_ > 0) render(_L_PAREN);
+       if (_i_ > 0) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.WhereC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.WhereC _wherec = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.WhereC) foo;
+       if (_i_ > 0) render(_L_PAREN);
+       render("WHERE");
+       pp(_wherec.condexpr_, 0);
+       if (_i_ > 0) render(_R_PAREN);
+    }
+  }
+
+  private static void pp(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderBy foo, int _i_)
+  {
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NoOrderByC)
+    {
+       if (_i_ > 0) render(_L_PAREN);
+       if (_i_ > 0) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderByC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderByC _orderbyc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderByC) foo;
+       if (_i_ > 0) render(_L_PAREN);
+       render("ORDER");
+       render("BY");
+       pp(_orderbyc.listorderitem_, 0);
+       if (_i_ > 0) render(_R_PAREN);
+    }
+  }
+
+  private static void pp(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderItem foo, int _i_)
+  {
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderItemC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderItemC _orderitemc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderItemC) foo;
+       if (_i_ > 0) render(_L_PAREN);
+       pp(_orderitemc.condexpr_, 0);
+       pp(_orderitemc.order_, 0);
+       pp(_orderitemc.nulls_, 0);
+       if (_i_ > 0) render(_R_PAREN);
+    }
+  }
+
+  private static void pp(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Order foo, int _i_)
+  {
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.AscOrderC)
+    {
+       if (_i_ > 0) render(_L_PAREN);
+       render("ASC");
+       if (_i_ > 0) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.DescOrderC)
+    {
+       if (_i_ > 0) render(_L_PAREN);
+       render("DESC");
+       if (_i_ > 0) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NoOrderC)
+    {
+       if (_i_ > 0) render(_L_PAREN);
+       if (_i_ > 0) render(_R_PAREN);
+    }
+  }
+
+  private static void pp(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Nulls foo, int _i_)
+  {
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NoNullsC)
+    {
+       if (_i_ > 0) render(_L_PAREN);
+       if (_i_ > 0) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NullFirstsC)
+    {
+       if (_i_ > 0) render(_L_PAREN);
+       render("NULLS");
+       render("FIRST");
+       if (_i_ > 0) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NullsLastC)
+    {
+       if (_i_ > 0) render(_L_PAREN);
+       render("NULLS");
+       render("LAST");
+       if (_i_ > 0) render(_R_PAREN);
+    }
+  }
+
+  private static void pp(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItem foo, int _i_)
+  {
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItemC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItemC _selitemc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItemC) foo;
+       if (_i_ > 0) render(_L_PAREN);
+       pp(_selitemc.condexpr_, 0);
+       if (_i_ > 0) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.AliasedSelItemC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.AliasedSelItemC _aliasedselitemc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.AliasedSelItemC) foo;
+       if (_i_ > 0) render(_L_PAREN);
+       pp(_aliasedselitemc.condexpr_, 0);
+       render("AS");
+       pp(_aliasedselitemc.qident_, 0);
+       if (_i_ > 0) render(_R_PAREN);
+    }
+  }
+
+  private static void pp(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExpr foo, int _i_)
+  {
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprCmpC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprCmpC _boolexprcmpc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprCmpC) foo;
+       if (_i_ > 0) render(_L_PAREN);
+       pp(_boolexprcmpc.basicexpr_1, 0);
+       pp(_boolexprcmpc.relop_, 0);
+       pp(_boolexprcmpc.basicexpr_2, 0);
+       if (_i_ > 0) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprRegExpC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprRegExpC _boolexprregexpc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprRegExpC) foo;
+       if (_i_ > 0) render(_L_PAREN);
+       pp(_boolexprregexpc.basicexpr_, 0);
+       render("REGEXP");
+       printQuoted(_boolexprregexpc.string_);
+       if (_i_ > 0) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprBasicExprC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprBasicExprC _boolexprbasicexprc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprBasicExprC) foo;
+       if (_i_ > 0) render(_L_PAREN);
+       pp(_boolexprbasicexprc.basicexpr_, 0);
+       if (_i_ > 0) render(_R_PAREN);
+    }
+  }
+
+  private static void pp(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr foo, int _i_)
+  {
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprOrC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprOrC _condexprorc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprOrC) foo;
+       if (_i_ > 0) render(_L_PAREN);
+       pp(_condexprorc.condexpr_1, 0);
+       render("OR");
+       pp(_condexprorc.condexpr_2, 1);
+       if (_i_ > 0) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprAndC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprAndC _condexprandc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprAndC) foo;
+       if (_i_ > 1) render(_L_PAREN);
+       pp(_condexprandc.condexpr_1, 1);
+       render("AND");
+       pp(_condexprandc.condexpr_2, 2);
+       if (_i_ > 1) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprNotC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprNotC _condexprnotc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprNotC) foo;
+       if (_i_ > 2) render(_L_PAREN);
+       render("NOT");
+       pp(_condexprnotc.condexpr_, 2);
+       if (_i_ > 2) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprBoolExprC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprBoolExprC _condexprboolexprc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprBoolExprC) foo;
+       if (_i_ > 2) render(_L_PAREN);
+       pp(_condexprboolexprc.boolexpr_, 0);
+       if (_i_ > 2) render(_R_PAREN);
+    }
+  }
+
+  private static void pp(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr foo, int _i_)
+  {
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprAddC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprAddC _basicexpraddc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprAddC) foo;
+       if (_i_ > 0) render(_L_PAREN);
+       pp(_basicexpraddc.basicexpr_1, 0);
+       render("+");
+       pp(_basicexpraddc.basicexpr_2, 1);
+       if (_i_ > 0) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprSubC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprSubC _basicexprsubc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprSubC) foo;
+       if (_i_ > 0) render(_L_PAREN);
+       pp(_basicexprsubc.basicexpr_1, 0);
+       render("-");
+       pp(_basicexprsubc.basicexpr_2, 1);
+       if (_i_ > 0) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprMulC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprMulC _basicexprmulc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprMulC) foo;
+       if (_i_ > 1) render(_L_PAREN);
+       pp(_basicexprmulc.basicexpr_1, 1);
+       render("*");
+       pp(_basicexprmulc.basicexpr_2, 2);
+       if (_i_ > 1) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprDivC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprDivC _basicexprdivc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprDivC) foo;
+       if (_i_ > 1) render(_L_PAREN);
+       pp(_basicexprdivc.basicexpr_1, 1);
+       render("/");
+       pp(_basicexprdivc.basicexpr_2, 2);
+       if (_i_ > 1) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprModC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprModC _basicexprmodc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprModC) foo;
+       if (_i_ > 1) render(_L_PAREN);
+       pp(_basicexprmodc.basicexpr_1, 1);
+       render("%");
+       pp(_basicexprmodc.basicexpr_2, 2);
+       if (_i_ > 1) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprNegC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprNegC _basicexprnegc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprNegC) foo;
+       if (_i_ > 2) render(_L_PAREN);
+       render("-");
+       pp(_basicexprnegc.basicexpr_, 2);
+       if (_i_ > 2) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EBoolC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EBoolC _eboolc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EBoolC) foo;
+       if (_i_ > 3) render(_L_PAREN);
+       pp(_eboolc.qbool_, 0);
+       if (_i_ > 3) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EIdentC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EIdentC _eidentc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EIdentC) foo;
+       if (_i_ > 3) render(_L_PAREN);
+       pp(_eidentc.qident_, 0);
+       if (_i_ > 3) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EFunC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EFunC _efunc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EFunC) foo;
+       if (_i_ > 3) render(_L_PAREN);
+       pp(_efunc.qident_, 0);
+       render("(");
+       pp(_efunc.listcondexpr_, 0);
+       render(")");
+       if (_i_ > 3) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EStrC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EStrC _estrc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EStrC) foo;
+       if (_i_ > 3) render(_L_PAREN);
+       printQuoted(_estrc.string_);
+       if (_i_ > 3) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EIntC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EIntC _eintc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EIntC) foo;
+       if (_i_ > 3) render(_L_PAREN);
+       pp(_eintc.qinteger_, 0);
+       if (_i_ > 3) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EDblC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EDblC _edblc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EDblC) foo;
+       if (_i_ > 3) render(_L_PAREN);
+       pp(_edblc.qdouble_, 0);
+       if (_i_ > 3) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ECondExprC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ECondExprC _econdexprc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ECondExprC) foo;
+       if (_i_ > 3) render(_L_PAREN);
+       render("(");
+       pp(_econdexprc.condexpr_, 0);
+       render(")");
+       if (_i_ > 3) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EStmtC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EStmtC _estmtc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EStmtC) foo;
+       if (_i_ > 3) render(_L_PAREN);
+       render("(");
+       pp(_estmtc.statement_, 0);
+       render(")");
+       if (_i_ > 3) render(_R_PAREN);
+    }
+  }
+
+  private static void pp(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOp foo, int _i_)
+  {
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpGtC)
+    {
+       if (_i_ > 0) render(_L_PAREN);
+       render(">");
+       if (_i_ > 0) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpEqC)
+    {
+       if (_i_ > 0) render(_L_PAREN);
+       render("=");
+       if (_i_ > 0) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpNeC)
+    {
+       if (_i_ > 0) render(_L_PAREN);
+       render("<>");
+       if (_i_ > 0) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpLtC)
+    {
+       if (_i_ > 0) render(_L_PAREN);
+       render("<");
+       if (_i_ > 0) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpLeC)
+    {
+       if (_i_ > 0) render(_L_PAREN);
+       render("<=");
+       if (_i_ > 0) render(_R_PAREN);
+    }
+    else     if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpGeC)
+    {
+       if (_i_ > 0) render(_L_PAREN);
+       render(">=");
+       if (_i_ > 0) render(_R_PAREN);
+    }
+  }
+
+
+  private static void sh(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListStatement foo)
+  {
+     for (java.util.Iterator<Statement> it = foo.iterator(); it.hasNext();)
+     {
+       sh(it.next());
+       if (it.hasNext())
+         render(",");
+     }
+  }
+
+  private static void sh(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListOrderItem foo)
+  {
+     for (java.util.Iterator<OrderItem> it = foo.iterator(); it.hasNext();)
+     {
+       sh(it.next());
+       if (it.hasNext())
+         render(",");
+     }
+  }
+
+  private static void sh(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListSelItem foo)
+  {
+     for (java.util.Iterator<SelItem> it = foo.iterator(); it.hasNext();)
+     {
+       sh(it.next());
+       if (it.hasNext())
+         render(",");
+     }
+  }
+
+  private static void sh(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListCondExpr foo)
+  {
+     for (java.util.Iterator<CondExpr> it = foo.iterator(); it.hasNext();)
+     {
+       sh(it.next());
+       if (it.hasNext())
+         render(",");
+     }
+  }
+
+  private static void sh(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Program foo)
+  {
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ProgramC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ProgramC _programc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ProgramC) foo;
+       render("(");
+       render("ProgramC");
+       render("[");
+       sh(_programc.liststatement_);
+       render("]");
+       render(")");
+    }
+  }
+
+  private static void sh(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Statement foo)
+  {
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.StatementC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.StatementC _statementc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.StatementC) foo;
+       render("(");
+       render("StatementC");
+       render("[");
+       sh(_statementc.listselitem_);
+       render("]");
+       sh(_statementc.where_);
+       sh(_statementc.orderby_);
+       render(")");
+    }
+  }
+
+  private static void sh(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Where foo)
+  {
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NoWhereC)
+    {
+       render("NoWhereC");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.WhereC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.WhereC _wherec = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.WhereC) foo;
+       render("(");
+       render("WhereC");
+       sh(_wherec.condexpr_);
+       render(")");
+    }
+  }
+
+  private static void sh(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderBy foo)
+  {
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NoOrderByC)
+    {
+       render("NoOrderByC");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderByC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderByC _orderbyc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderByC) foo;
+       render("(");
+       render("OrderByC");
+       render("[");
+       sh(_orderbyc.listorderitem_);
+       render("]");
+       render(")");
+    }
+  }
+
+  private static void sh(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderItem foo)
+  {
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderItemC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderItemC _orderitemc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderItemC) foo;
+       render("(");
+       render("OrderItemC");
+       sh(_orderitemc.condexpr_);
+       sh(_orderitemc.order_);
+       sh(_orderitemc.nulls_);
+       render(")");
+    }
+  }
+
+  private static void sh(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Order foo)
+  {
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.AscOrderC)
+    {
+       render("AscOrderC");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.DescOrderC)
+    {
+       render("DescOrderC");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NoOrderC)
+    {
+       render("NoOrderC");
+    }
+  }
+
+  private static void sh(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Nulls foo)
+  {
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NoNullsC)
+    {
+       render("NoNullsC");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NullFirstsC)
+    {
+       render("NullFirstsC");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NullsLastC)
+    {
+       render("NullsLastC");
+    }
+  }
+
+  private static void sh(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItem foo)
+  {
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItemC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItemC _selitemc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItemC) foo;
+       render("(");
+       render("SelItemC");
+       sh(_selitemc.condexpr_);
+       render(")");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.AliasedSelItemC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.AliasedSelItemC _aliasedselitemc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.AliasedSelItemC) foo;
+       render("(");
+       render("AliasedSelItemC");
+       sh(_aliasedselitemc.condexpr_);
+       sh(_aliasedselitemc.qident_);
+       render(")");
+    }
+  }
+
+  private static void sh(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExpr foo)
+  {
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprCmpC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprCmpC _boolexprcmpc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprCmpC) foo;
+       render("(");
+       render("BoolExprCmpC");
+       sh(_boolexprcmpc.basicexpr_1);
+       sh(_boolexprcmpc.relop_);
+       sh(_boolexprcmpc.basicexpr_2);
+       render(")");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprRegExpC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprRegExpC _boolexprregexpc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprRegExpC) foo;
+       render("(");
+       render("BoolExprRegExpC");
+       sh(_boolexprregexpc.basicexpr_);
+       sh(_boolexprregexpc.string_);
+       render(")");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprBasicExprC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprBasicExprC _boolexprbasicexprc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprBasicExprC) foo;
+       render("(");
+       render("BoolExprBasicExprC");
+       sh(_boolexprbasicexprc.basicexpr_);
+       render(")");
+    }
+  }
+
+  private static void sh(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr foo)
+  {
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprOrC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprOrC _condexprorc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprOrC) foo;
+       render("(");
+       render("CondExprOrC");
+       sh(_condexprorc.condexpr_1);
+       sh(_condexprorc.condexpr_2);
+       render(")");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprAndC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprAndC _condexprandc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprAndC) foo;
+       render("(");
+       render("CondExprAndC");
+       sh(_condexprandc.condexpr_1);
+       sh(_condexprandc.condexpr_2);
+       render(")");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprNotC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprNotC _condexprnotc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprNotC) foo;
+       render("(");
+       render("CondExprNotC");
+       sh(_condexprnotc.condexpr_);
+       render(")");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprBoolExprC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprBoolExprC _condexprboolexprc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprBoolExprC) foo;
+       render("(");
+       render("CondExprBoolExprC");
+       sh(_condexprboolexprc.boolexpr_);
+       render(")");
+    }
+  }
+
+  private static void sh(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr foo)
+  {
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprAddC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprAddC _basicexpraddc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprAddC) foo;
+       render("(");
+       render("BasicExprAddC");
+       sh(_basicexpraddc.basicexpr_1);
+       sh(_basicexpraddc.basicexpr_2);
+       render(")");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprSubC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprSubC _basicexprsubc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprSubC) foo;
+       render("(");
+       render("BasicExprSubC");
+       sh(_basicexprsubc.basicexpr_1);
+       sh(_basicexprsubc.basicexpr_2);
+       render(")");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprMulC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprMulC _basicexprmulc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprMulC) foo;
+       render("(");
+       render("BasicExprMulC");
+       sh(_basicexprmulc.basicexpr_1);
+       sh(_basicexprmulc.basicexpr_2);
+       render(")");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprDivC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprDivC _basicexprdivc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprDivC) foo;
+       render("(");
+       render("BasicExprDivC");
+       sh(_basicexprdivc.basicexpr_1);
+       sh(_basicexprdivc.basicexpr_2);
+       render(")");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprModC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprModC _basicexprmodc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprModC) foo;
+       render("(");
+       render("BasicExprModC");
+       sh(_basicexprmodc.basicexpr_1);
+       sh(_basicexprmodc.basicexpr_2);
+       render(")");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprNegC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprNegC _basicexprnegc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprNegC) foo;
+       render("(");
+       render("BasicExprNegC");
+       sh(_basicexprnegc.basicexpr_);
+       render(")");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EBoolC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EBoolC _eboolc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EBoolC) foo;
+       render("(");
+       render("EBoolC");
+       sh(_eboolc.qbool_);
+       render(")");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EIdentC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EIdentC _eidentc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EIdentC) foo;
+       render("(");
+       render("EIdentC");
+       sh(_eidentc.qident_);
+       render(")");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EFunC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EFunC _efunc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EFunC) foo;
+       render("(");
+       render("EFunC");
+       sh(_efunc.qident_);
+       render("[");
+       sh(_efunc.listcondexpr_);
+       render("]");
+       render(")");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EStrC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EStrC _estrc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EStrC) foo;
+       render("(");
+       render("EStrC");
+       sh(_estrc.string_);
+       render(")");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EIntC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EIntC _eintc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EIntC) foo;
+       render("(");
+       render("EIntC");
+       sh(_eintc.qinteger_);
+       render(")");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EDblC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EDblC _edblc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EDblC) foo;
+       render("(");
+       render("EDblC");
+       sh(_edblc.qdouble_);
+       render(")");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ECondExprC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ECondExprC _econdexprc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ECondExprC) foo;
+       render("(");
+       render("ECondExprC");
+       sh(_econdexprc.condexpr_);
+       render(")");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EStmtC)
+    {
+       pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EStmtC _estmtc = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EStmtC) foo;
+       render("(");
+       render("EStmtC");
+       sh(_estmtc.statement_);
+       render(")");
+    }
+  }
+
+  private static void sh(pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOp foo)
+  {
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpGtC)
+    {
+       render("RelOpGtC");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpEqC)
+    {
+       render("RelOpEqC");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpNeC)
+    {
+       render("RelOpNeC");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpLtC)
+    {
+       render("RelOpLtC");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpLeC)
+    {
+       render("RelOpLeC");
+    }
+    if (foo instanceof pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpGeC)
+    {
+       render("RelOpGeC");
+    }
+  }
+
+
+  private static void pp(String s, int _i_) { buf_.append(s); buf_.append(" "); }
+  private static void sh(String s) { printQuoted(s); }
+  private static void printQuoted(String s) { render("\"" + s + "\""); }
+  private static void indent()
+  {
+    int n = _n_;
+    while (n > 0)
+    {
+      buf_.append(" ");
+      n--;
+    }
+  }
+  private static void backup()
+  {
+     if (buf_.charAt(buf_.length() - 1) == ' ') {
+      buf_.setLength(buf_.length() - 1);
+    }
+  }
+  private static void trim()
+  {
+     while (buf_.length() > 0 && buf_.charAt(0) == ' ')
+        buf_.deleteCharAt(0); 
+    while (buf_.length() > 0 && buf_.charAt(buf_.length()-1) == ' ')
+        buf_.deleteCharAt(buf_.length()-1);
+  }
+  private static int _n_ = 0;
+  private static StringBuilder buf_ = new StringBuilder(INITIAL_BUFFER_SIZE);
+}
+
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Test.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Test.java
new file mode 100644
index 0000000..57ac1f8
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Test.java
@@ -0,0 +1,46 @@
+package pl.edu.mimuw.cloudatlas.interpreter.query;
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+
+public class Test
+{
+  public static void main(String args[]) throws Exception
+  {
+    Yylex l = null;
+    parser p;
+    try
+    {
+      if (args.length == 0) l = new Yylex(System.in);
+      else l = new Yylex(new FileReader(args[0]));
+    }
+    catch(FileNotFoundException e)
+    {
+     System.err.println("Error: File not found: " + args[0]);
+     System.exit(1);
+    }
+    p = new parser(l);
+    /* The default parser is the first-defined entry point. */
+    /* You may want to change this. Other options are: */
+    /*  */
+    try
+    {
+      pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Program parse_tree = p.pProgram();
+      System.out.println();
+      System.out.println("Parse Succesful!");
+      System.out.println();
+      System.out.println("[Abstract Syntax]");
+      System.out.println();
+      System.out.println(PrettyPrinter.show(parse_tree));
+      System.out.println();
+      System.out.println("[Linearized Tree]");
+      System.out.println();
+      System.out.println(PrettyPrinter.print(parse_tree));
+    }
+    catch(Throwable e)
+    {
+      System.err.println("At line " + String.valueOf(l.line_num()) + ", near \"" + l.buff() + "\" :");
+      System.err.println("     " + e.getMessage());
+      System.exit(1);
+    }
+  }
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Yylex b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Yylex
new file mode 100644
index 0000000..4dd8029
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Yylex
@@ -0,0 +1,76 @@
+// This JLex file was machine-generated by the BNF converter
+package pl.edu.mimuw.mmws.cloudatlas.query;
+
+import java_cup.runtime.*;
+%%
+%cup
+%unicode
+%line
+%public
+%{
+  String pstring = new String();
+  public int line_num() { return (yyline+1); }
+  public String buff() { return new String(yy_buffer,yy_buffer_index,10).trim(); }
+%}
+LETTER = ({CAPITAL}|{SMALL})
+CAPITAL = [A-Z\xC0-\xD6\xD8-\xDE]
+SMALL = [a-z\xDF-\xF6\xF8-\xFF]
+DIGIT = [0-9]
+IDENT = ({LETTER}|{DIGIT}|['_])
+%state COMMENT
+%state CHAR
+%state CHARESC
+%state CHAREND
+%state STRING
+%state ESCAPED
+%%
+<YYINITIAL>; { return new Symbol(sym._SYMB_0); }
+<YYINITIAL>, { return new Symbol(sym._SYMB_1); }
+<YYINITIAL>\+ { return new Symbol(sym._SYMB_2); }
+<YYINITIAL>- { return new Symbol(sym._SYMB_3); }
+<YYINITIAL>\* { return new Symbol(sym._SYMB_4); }
+<YYINITIAL>/ { return new Symbol(sym._SYMB_5); }
+<YYINITIAL>% { return new Symbol(sym._SYMB_6); }
+<YYINITIAL>\( { return new Symbol(sym._SYMB_7); }
+<YYINITIAL>\) { return new Symbol(sym._SYMB_8); }
+<YYINITIAL>> { return new Symbol(sym._SYMB_9); }
+<YYINITIAL>= { return new Symbol(sym._SYMB_10); }
+<YYINITIAL><> { return new Symbol(sym._SYMB_11); }
+<YYINITIAL>< { return new Symbol(sym._SYMB_12); }
+<YYINITIAL><= { return new Symbol(sym._SYMB_13); }
+<YYINITIAL>>= { return new Symbol(sym._SYMB_14); }
+<YYINITIAL>AND { return new Symbol(sym._SYMB_15); }
+<YYINITIAL>AS { return new Symbol(sym._SYMB_16); }
+<YYINITIAL>ASC { return new Symbol(sym._SYMB_17); }
+<YYINITIAL>BY { return new Symbol(sym._SYMB_18); }
+<YYINITIAL>DESC { return new Symbol(sym._SYMB_19); }
+<YYINITIAL>FIRST { return new Symbol(sym._SYMB_20); }
+<YYINITIAL>LAST { return new Symbol(sym._SYMB_21); }
+<YYINITIAL>NOT { return new Symbol(sym._SYMB_22); }
+<YYINITIAL>NULLS { return new Symbol(sym._SYMB_23); }
+<YYINITIAL>OR { return new Symbol(sym._SYMB_24); }
+<YYINITIAL>ORDER { return new Symbol(sym._SYMB_25); }
+<YYINITIAL>REGEXP { return new Symbol(sym._SYMB_26); }
+<YYINITIAL>SELECT { return new Symbol(sym._SYMB_27); }
+<YYINITIAL>WHERE { return new Symbol(sym._SYMB_28); }
+
+<YYINITIAL>true|false { return new Symbol(sym.QBool, yytext().intern()); }
+<YYINITIAL>({LETTER}|&)({LETTER}|{DIGIT}|_)* { return new Symbol(sym.QIdent, yytext().intern()); }
+<YYINITIAL>{DIGIT}*\.{DIGIT}+([eE]-?{DIGIT}+)?|{DIGIT}+([eE]-?{DIGIT}+) { return new Symbol(sym.QDouble, yytext().intern()); }
+<YYINITIAL>0|[123456789]{DIGIT}* { return new Symbol(sym.QInteger, yytext().intern()); }
+
+<YYINITIAL>"\"" { yybegin(STRING); }
+<STRING>\\ { yybegin(ESCAPED); }
+<STRING>\" { String foo = pstring; pstring = new String(); yybegin(YYINITIAL); return new Symbol(sym._STRING_, foo.intern()); }
+<STRING>.  { pstring += yytext(); }
+<ESCAPED>n { pstring +=  "\n"; yybegin(STRING); }
+<ESCAPED>\" { pstring += "\""; yybegin(STRING); }
+<ESCAPED>\\ { pstring += "\\"; yybegin(STRING); }
+<ESCAPED>t  { pstring += "\t"; yybegin(STRING); }
+<ESCAPED>.  { pstring += yytext(); yybegin(STRING); }
+
+
+
+
+
+<YYINITIAL>[ \t\r\n\f] { /* ignore white space. */ }
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Yylex.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Yylex.java
new file mode 100644
index 0000000..2fb69d7
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/Yylex.java
@@ -0,0 +1,763 @@
+// This JLex file was machine-generated by the BNF converter
+package pl.edu.mimuw.cloudatlas.interpreter.query;
+import java_cup.runtime.*;
+
+
+public class Yylex implements java_cup.runtime.Scanner {
+	private final int YY_BUFFER_SIZE = 512;
+	private final int YY_F = -1;
+	private final int YY_NO_STATE = -1;
+	private final int YY_NOT_ACCEPT = 0;
+	private final int YY_END = 2;
+	private final int YY_NO_ANCHOR = 4;
+	private final int YY_BOL = 65536;
+	private final int YY_EOF = 65537;
+
+  String pstring = new String();
+  public int line_num() { return (yyline+1); }
+  public String buff() { return new String(yy_buffer,yy_buffer_index,10).trim(); }
+	private java.io.BufferedReader yy_reader;
+	private int yy_buffer_index;
+	private int yy_buffer_read;
+	private int yy_buffer_start;
+	private int yy_buffer_end;
+	private char yy_buffer[];
+	private int yyline;
+	private boolean yy_at_bol;
+	private int yy_lexical_state;
+
+	public Yylex (java.io.Reader reader) {
+		this ();
+		if (null == reader) {
+			throw (new Error("Error: Bad input stream initializer."));
+		}
+		yy_reader = new java.io.BufferedReader(reader);
+	}
+
+	public Yylex (java.io.InputStream instream) {
+		this ();
+		if (null == instream) {
+			throw (new Error("Error: Bad input stream initializer."));
+		}
+		yy_reader = new java.io.BufferedReader(new java.io.InputStreamReader(instream));
+	}
+
+	private Yylex () {
+		yy_buffer = new char[YY_BUFFER_SIZE];
+		yy_buffer_read = 0;
+		yy_buffer_index = 0;
+		yy_buffer_start = 0;
+		yy_buffer_end = 0;
+		yyline = 0;
+		yy_at_bol = true;
+		yy_lexical_state = YYINITIAL;
+	}
+
+	private final int STRING = 5;
+	private final int ESCAPED = 6;
+	private final int YYINITIAL = 0;
+	private final int yy_state_dtrans[] = {
+		0,
+		57,
+		57,
+		57,
+		57,
+		59,
+		61
+	};
+	private void yybegin (int state) {
+		yy_lexical_state = state;
+	}
+	private int yy_advance ()
+		throws java.io.IOException {
+		int next_read;
+		int i;
+		int j;
+
+		if (yy_buffer_index < yy_buffer_read) {
+			return yy_buffer[yy_buffer_index++];
+		}
+
+		if (0 != yy_buffer_start) {
+			i = yy_buffer_start;
+			j = 0;
+			while (i < yy_buffer_read) {
+				yy_buffer[j] = yy_buffer[i];
+				++i;
+				++j;
+			}
+			yy_buffer_end = yy_buffer_end - yy_buffer_start;
+			yy_buffer_start = 0;
+			yy_buffer_read = j;
+			yy_buffer_index = j;
+			next_read = yy_reader.read(yy_buffer,
+					yy_buffer_read,
+					yy_buffer.length - yy_buffer_read);
+			if (-1 == next_read) {
+				return YY_EOF;
+			}
+			yy_buffer_read = yy_buffer_read + next_read;
+		}
+
+		while (yy_buffer_index >= yy_buffer_read) {
+			if (yy_buffer_index >= yy_buffer.length) {
+				yy_buffer = yy_double(yy_buffer);
+			}
+			next_read = yy_reader.read(yy_buffer,
+					yy_buffer_read,
+					yy_buffer.length - yy_buffer_read);
+			if (-1 == next_read) {
+				return YY_EOF;
+			}
+			yy_buffer_read = yy_buffer_read + next_read;
+		}
+		return yy_buffer[yy_buffer_index++];
+	}
+	private void yy_move_end () {
+		if (yy_buffer_end > yy_buffer_start &&
+		    '\n' == yy_buffer[yy_buffer_end-1])
+			yy_buffer_end--;
+		if (yy_buffer_end > yy_buffer_start &&
+		    '\r' == yy_buffer[yy_buffer_end-1])
+			yy_buffer_end--;
+	}
+	private boolean yy_last_was_cr=false;
+	private void yy_mark_start () {
+		int i;
+		for (i = yy_buffer_start; i < yy_buffer_index; ++i) {
+			if ('\n' == yy_buffer[i] && !yy_last_was_cr) {
+				++yyline;
+			}
+			if ('\r' == yy_buffer[i]) {
+				++yyline;
+				yy_last_was_cr=true;
+			} else yy_last_was_cr=false;
+		}
+		yy_buffer_start = yy_buffer_index;
+	}
+	private void yy_mark_end () {
+		yy_buffer_end = yy_buffer_index;
+	}
+	private void yy_to_mark () {
+		yy_buffer_index = yy_buffer_end;
+		yy_at_bol = (yy_buffer_end > yy_buffer_start) &&
+		            ('\r' == yy_buffer[yy_buffer_end-1] ||
+		             '\n' == yy_buffer[yy_buffer_end-1] ||
+		             2028/*LS*/ == yy_buffer[yy_buffer_end-1] ||
+		             2029/*PS*/ == yy_buffer[yy_buffer_end-1]);
+	}
+	private java.lang.String yytext () {
+		return (new java.lang.String(yy_buffer,
+			yy_buffer_start,
+			yy_buffer_end - yy_buffer_start));
+	}
+	private char[] yy_double (char buf[]) {
+		int i;
+		char newbuf[];
+		newbuf = new char[2*buf.length];
+		for (i = 0; i < buf.length; ++i) {
+			newbuf[i] = buf[i];
+		}
+		return newbuf;
+	}
+	private final int YY_E_INTERNAL = 0;
+	private java.lang.String yy_error_string[] = {
+		"Error: Internal error.\n",
+		"Error: Unmatched input.\n"
+	};
+	private void yy_error (int code,boolean fatal) {
+		java.lang.System.out.print(yy_error_string[code]);
+		java.lang.System.out.flush();
+		if (fatal) {
+			throw new Error("Fatal Error.\n");
+		}
+	}
+	private int[][] unpackFromString(int size1, int size2, String st) {
+		int colonIndex = -1;
+		String lengthString;
+		int sequenceLength = 0;
+		int sequenceInteger = 0;
+
+		int commaIndex;
+		String workString;
+
+		int res[][] = new int[size1][size2];
+		for (int i= 0; i < size1; i++) {
+			for (int j= 0; j < size2; j++) {
+				if (sequenceLength != 0) {
+					res[i][j] = sequenceInteger;
+					sequenceLength--;
+					continue;
+				}
+				commaIndex = st.indexOf(',');
+				workString = (commaIndex==-1) ? st :
+					st.substring(0, commaIndex);
+				st = st.substring(commaIndex+1);
+				colonIndex = workString.indexOf(':');
+				if (colonIndex == -1) {
+					res[i][j]=Integer.parseInt(workString);
+					continue;
+				}
+				lengthString =
+					workString.substring(colonIndex+1);
+				sequenceLength=Integer.parseInt(lengthString);
+				workString=workString.substring(0,colonIndex);
+				sequenceInteger=Integer.parseInt(workString);
+				res[i][j] = sequenceInteger;
+				sequenceLength--;
+			}
+		}
+		return res;
+	}
+	private int yy_acpt[] = {
+		/* 0 */ YY_NOT_ACCEPT,
+		/* 1 */ YY_NO_ANCHOR,
+		/* 2 */ YY_NO_ANCHOR,
+		/* 3 */ YY_NO_ANCHOR,
+		/* 4 */ YY_NO_ANCHOR,
+		/* 5 */ YY_NO_ANCHOR,
+		/* 6 */ YY_NO_ANCHOR,
+		/* 7 */ YY_NO_ANCHOR,
+		/* 8 */ YY_NO_ANCHOR,
+		/* 9 */ YY_NO_ANCHOR,
+		/* 10 */ YY_NO_ANCHOR,
+		/* 11 */ YY_NO_ANCHOR,
+		/* 12 */ YY_NO_ANCHOR,
+		/* 13 */ YY_NO_ANCHOR,
+		/* 14 */ YY_NO_ANCHOR,
+		/* 15 */ YY_NO_ANCHOR,
+		/* 16 */ YY_NO_ANCHOR,
+		/* 17 */ YY_NO_ANCHOR,
+		/* 18 */ YY_NO_ANCHOR,
+		/* 19 */ YY_NO_ANCHOR,
+		/* 20 */ YY_NO_ANCHOR,
+		/* 21 */ YY_NO_ANCHOR,
+		/* 22 */ YY_NO_ANCHOR,
+		/* 23 */ YY_NO_ANCHOR,
+		/* 24 */ YY_NO_ANCHOR,
+		/* 25 */ YY_NO_ANCHOR,
+		/* 26 */ YY_NO_ANCHOR,
+		/* 27 */ YY_NO_ANCHOR,
+		/* 28 */ YY_NO_ANCHOR,
+		/* 29 */ YY_NO_ANCHOR,
+		/* 30 */ YY_NO_ANCHOR,
+		/* 31 */ YY_NO_ANCHOR,
+		/* 32 */ YY_NO_ANCHOR,
+		/* 33 */ YY_NO_ANCHOR,
+		/* 34 */ YY_NO_ANCHOR,
+		/* 35 */ YY_NO_ANCHOR,
+		/* 36 */ YY_NO_ANCHOR,
+		/* 37 */ YY_NO_ANCHOR,
+		/* 38 */ YY_NO_ANCHOR,
+		/* 39 */ YY_NO_ANCHOR,
+		/* 40 */ YY_NO_ANCHOR,
+		/* 41 */ YY_NO_ANCHOR,
+		/* 42 */ YY_NO_ANCHOR,
+		/* 43 */ YY_NO_ANCHOR,
+		/* 44 */ YY_NO_ANCHOR,
+		/* 45 */ YY_NOT_ACCEPT,
+		/* 46 */ YY_NO_ANCHOR,
+		/* 47 */ YY_NO_ANCHOR,
+		/* 48 */ YY_NO_ANCHOR,
+		/* 49 */ YY_NOT_ACCEPT,
+		/* 50 */ YY_NO_ANCHOR,
+		/* 51 */ YY_NOT_ACCEPT,
+		/* 52 */ YY_NO_ANCHOR,
+		/* 53 */ YY_NOT_ACCEPT,
+		/* 54 */ YY_NO_ANCHOR,
+		/* 55 */ YY_NOT_ACCEPT,
+		/* 56 */ YY_NO_ANCHOR,
+		/* 57 */ YY_NOT_ACCEPT,
+		/* 58 */ YY_NO_ANCHOR,
+		/* 59 */ YY_NOT_ACCEPT,
+		/* 60 */ YY_NO_ANCHOR,
+		/* 61 */ YY_NOT_ACCEPT,
+		/* 62 */ YY_NO_ANCHOR,
+		/* 63 */ YY_NO_ANCHOR,
+		/* 64 */ YY_NO_ANCHOR,
+		/* 65 */ YY_NO_ANCHOR,
+		/* 66 */ YY_NO_ANCHOR,
+		/* 67 */ YY_NO_ANCHOR,
+		/* 68 */ YY_NO_ANCHOR,
+		/* 69 */ YY_NO_ANCHOR,
+		/* 70 */ YY_NO_ANCHOR,
+		/* 71 */ YY_NO_ANCHOR,
+		/* 72 */ YY_NO_ANCHOR,
+		/* 73 */ YY_NO_ANCHOR,
+		/* 74 */ YY_NO_ANCHOR,
+		/* 75 */ YY_NO_ANCHOR,
+		/* 76 */ YY_NO_ANCHOR,
+		/* 77 */ YY_NO_ANCHOR,
+		/* 78 */ YY_NO_ANCHOR,
+		/* 79 */ YY_NO_ANCHOR,
+		/* 80 */ YY_NO_ANCHOR,
+		/* 81 */ YY_NO_ANCHOR,
+		/* 82 */ YY_NO_ANCHOR,
+		/* 83 */ YY_NO_ANCHOR,
+		/* 84 */ YY_NO_ANCHOR,
+		/* 85 */ YY_NO_ANCHOR,
+		/* 86 */ YY_NO_ANCHOR,
+		/* 87 */ YY_NO_ANCHOR,
+		/* 88 */ YY_NO_ANCHOR,
+		/* 89 */ YY_NO_ANCHOR,
+		/* 90 */ YY_NO_ANCHOR,
+		/* 91 */ YY_NO_ANCHOR,
+		/* 92 */ YY_NO_ANCHOR,
+		/* 93 */ YY_NO_ANCHOR,
+		/* 94 */ YY_NO_ANCHOR,
+		/* 95 */ YY_NO_ANCHOR
+	};
+	private int yy_cmap[] = unpackFromString(1,65538,
+"49:9,51,52,49,51,52,49:18,51,49,47,49:2,7,42,49,8,9,5,3,2,4,45,6,46,43:9,49" +
+",1,12,11,10,49:2,13,18,17,15,20,21,28,32,22,41:2,25,41,14,26,30,41,23,16,24" +
+",27,41,31,29,19,41,49,48,49:2,44,49,38,41:3,36,37,41:5,39,41,50,41:3,34,40," +
+"33,35,41:5,49:69,41:23,49,41:31,49,41:8,49:65280,0:2")[0];
+
+	private int yy_rmap[] = unpackFromString(1,96,
+"0,1:10,2,1,3,4,5,1:5,6,7,8,9,7:12,1:8,10,11,12,13,14,15,12,16,13,17,14,18,1" +
+"9,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,4" +
+"4,45,46,47,48,49,7,50,51,52,53,54,55,56")[0];
+
+	private int yy_nxt[][] = unpackFromString(57,53,
+"1,2,3,4,5,6,7,8,9,10,11,12,13,14,46,81,85,88,50,88:2,90,88,91,88,92,52,88:4" +
+",93,88,94,88:3,95,88:5,15,-1,45,47,16,-1:2,88,17:2,-1:64,18,-1:51,19,20,-1:" +
+"54,88,54,88,21,88:25,-1,88:2,-1,88,-1:3,88,-1:22,49,-1:15,49,-1:6,15,-1,45," +
+"15,-1:19,88:4,26,88:24,-1,88:2,-1,88,-1:3,88,-1:15,88:29,-1,88:2,-1,88,-1:3" +
+",88,-1:15,88:2,89,88:26,-1,88:2,-1,88,-1:3,88,-1:22,55,-1:15,55,-1:6,24,-1:" +
+"2,24,-1:49,24,-1:2,24,-1:19,88:13,56,58,88:14,-1,88:2,-1,88,-1:3,88,-1:22,4" +
+"9,-1:15,49,-1:6,51,-1,45,51,-1:49,48,-1:2,48,-1:10,53,-1:38,48,-1:2,48,-1:1" +
+"9,88:6,22,88:22,-1,88:2,-1,88,-1:3,88,-1:15,88:10,23,88:18,-1,88:2,-1,88,-1" +
+":3,88,-1:15,88:2,25,88:26,-1,88:2,-1,88,-1:3,88,-1:15,88:11,27,88:17,-1,88:" +
+"2,-1,88,-1:3,88,-1:2,1,-1:65,88:12,86,88:16,-1,88:2,-1,88,-1:3,88,-1:2,1,37" +
+":46,38,39,37:3,-1:14,88:3,67,88:25,-1,88:2,-1,88,-1:3,88,-1:2,1,40:32,41,40" +
+":13,42,43,40,44,40,-1:14,88:10,68,88:18,-1,88:2,-1,88,-1:3,88,-1:15,88:15,8" +
+"7,88:13,-1,88:2,-1,88,-1:3,88,-1:15,88:7,70,88:21,-1,88:2,-1,88,-1:3,88,-1:" +
+"15,88:22,71,88:6,-1,88:2,-1,88,-1:3,88,-1:15,88:26,72,88:2,-1,88:2,-1,88,-1" +
+":3,88,-1:15,88:4,28,88:24,-1,88:2,-1,88,-1:3,88,-1:15,88:3,75,88:25,-1,88:2" +
+",-1,88,-1:3,88,-1:15,88:11,29,88:17,-1,88:2,-1,88,-1:3,88,-1:15,88:10,78,88" +
+":18,-1,88:2,-1,88,-1:3,88,-1:15,88:23,30,88:5,-1,88:2,-1,88,-1:3,88,-1:15,8" +
+"8:27,71,88,-1,88:2,-1,88,-1:3,88,-1:15,88:3,31,88:25,-1,88:2,-1,88,-1:3,88," +
+"-1:15,88:4,79,88:24,-1,88:2,-1,88,-1:3,88,-1:15,88:11,32,88:17,-1,88:2,-1,8" +
+"8,-1:3,88,-1:15,88:16,80,88:12,-1,88:2,-1,88,-1:3,88,-1:15,88:10,33,88:18,-" +
+"1,88:2,-1,88,-1:3,88,-1:15,88:7,34,88:21,-1,88:2,-1,88,-1:3,88,-1:15,88:11," +
+"35,88:17,-1,88:2,-1,88,-1:3,88,-1:15,88:17,36,88:11,-1,88:2,-1,88,-1:3,88,-" +
+"1:15,88:7,60,88:21,-1,88:2,-1,88,-1:3,88,-1:15,88:12,84,88:16,-1,88:2,-1,88" +
+",-1:3,88,-1:15,88:3,69,88:25,-1,88:2,-1,88,-1:3,88,-1:15,88:7,74,88:21,-1,8" +
+"8:2,-1,88,-1:3,88,-1:15,88:7,82,88:21,-1,88:2,-1,88,-1:3,88,-1:15,88:12,73," +
+"88:16,-1,88:2,-1,88,-1:3,88,-1:15,88:7,76,88:21,-1,88:2,-1,88,-1:3,88,-1:15" +
+",88:7,77,88:21,-1,88:2,-1,88,-1:3,88,-1:15,88:9,62,88:19,-1,88:2,-1,88,-1:3" +
+",88,-1:15,88:7,63,88:21,-1,88:2,-1,88,-1:3,88,-1:15,83,88:28,-1,88:2,-1,88," +
+"-1:3,88,-1:15,88:19,64,88:9,-1,88:2,-1,88,-1:3,88,-1:15,88:21,65,88:7,-1,88" +
+":2,-1,88,-1:3,88,-1:15,88:25,66,88:3,-1,88:2,-1,88,-1:3,88,-1:2");
+
+	public java_cup.runtime.Symbol next_token ()
+		throws java.io.IOException {
+		int yy_lookahead;
+		int yy_anchor = YY_NO_ANCHOR;
+		int yy_state = yy_state_dtrans[yy_lexical_state];
+		int yy_next_state = YY_NO_STATE;
+		int yy_last_accept_state = YY_NO_STATE;
+		boolean yy_initial = true;
+		int yy_this_accept;
+
+		yy_mark_start();
+		yy_this_accept = yy_acpt[yy_state];
+		if (YY_NOT_ACCEPT != yy_this_accept) {
+			yy_last_accept_state = yy_state;
+			yy_mark_end();
+		}
+		while (true) {
+			if (yy_initial && yy_at_bol) yy_lookahead = YY_BOL;
+			else yy_lookahead = yy_advance();
+			yy_next_state = YY_F;
+			yy_next_state = yy_nxt[yy_rmap[yy_state]][yy_cmap[yy_lookahead]];
+			if (YY_EOF == yy_lookahead && true == yy_initial) {
+				return null;
+			}
+			if (YY_F != yy_next_state) {
+				yy_state = yy_next_state;
+				yy_initial = false;
+				yy_this_accept = yy_acpt[yy_state];
+				if (YY_NOT_ACCEPT != yy_this_accept) {
+					yy_last_accept_state = yy_state;
+					yy_mark_end();
+				}
+			}
+			else {
+				if (YY_NO_STATE == yy_last_accept_state) {
+					throw (new Error("Lexical Error: Unmatched Input."));
+				}
+				else {
+					yy_anchor = yy_acpt[yy_last_accept_state];
+					if (0 != (YY_END & yy_anchor)) {
+						yy_move_end();
+					}
+					yy_to_mark();
+					switch (yy_last_accept_state) {
+					case 1:
+						
+					case -2:
+						break;
+					case 2:
+						{ return new Symbol(sym._SYMB_0); }
+					case -3:
+						break;
+					case 3:
+						{ return new Symbol(sym._SYMB_1); }
+					case -4:
+						break;
+					case 4:
+						{ return new Symbol(sym._SYMB_2); }
+					case -5:
+						break;
+					case 5:
+						{ return new Symbol(sym._SYMB_3); }
+					case -6:
+						break;
+					case 6:
+						{ return new Symbol(sym._SYMB_4); }
+					case -7:
+						break;
+					case 7:
+						{ return new Symbol(sym._SYMB_5); }
+					case -8:
+						break;
+					case 8:
+						{ return new Symbol(sym._SYMB_6); }
+					case -9:
+						break;
+					case 9:
+						{ return new Symbol(sym._SYMB_7); }
+					case -10:
+						break;
+					case 10:
+						{ return new Symbol(sym._SYMB_8); }
+					case -11:
+						break;
+					case 11:
+						{ return new Symbol(sym._SYMB_9); }
+					case -12:
+						break;
+					case 12:
+						{ return new Symbol(sym._SYMB_10); }
+					case -13:
+						break;
+					case 13:
+						{ return new Symbol(sym._SYMB_12); }
+					case -14:
+						break;
+					case 14:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -15:
+						break;
+					case 15:
+						{ return new Symbol(sym.QInteger, yytext().intern()); }
+					case -16:
+						break;
+					case 16:
+						{ yybegin(STRING); }
+					case -17:
+						break;
+					case 17:
+						{ /* ignore white space. */ }
+					case -18:
+						break;
+					case 18:
+						{ return new Symbol(sym._SYMB_14); }
+					case -19:
+						break;
+					case 19:
+						{ return new Symbol(sym._SYMB_11); }
+					case -20:
+						break;
+					case 20:
+						{ return new Symbol(sym._SYMB_13); }
+					case -21:
+						break;
+					case 21:
+						{ return new Symbol(sym._SYMB_16); }
+					case -22:
+						break;
+					case 22:
+						{ return new Symbol(sym._SYMB_18); }
+					case -23:
+						break;
+					case 23:
+						{ return new Symbol(sym._SYMB_24); }
+					case -24:
+						break;
+					case 24:
+						{ return new Symbol(sym.QDouble, yytext().intern()); }
+					case -25:
+						break;
+					case 25:
+						{ return new Symbol(sym._SYMB_15); }
+					case -26:
+						break;
+					case 26:
+						{ return new Symbol(sym._SYMB_17); }
+					case -27:
+						break;
+					case 27:
+						{ return new Symbol(sym._SYMB_22); }
+					case -28:
+						break;
+					case 28:
+						{ return new Symbol(sym._SYMB_19); }
+					case -29:
+						break;
+					case 29:
+						{ return new Symbol(sym._SYMB_21); }
+					case -30:
+						break;
+					case 30:
+						{ return new Symbol(sym.QBool, yytext().intern()); }
+					case -31:
+						break;
+					case 31:
+						{ return new Symbol(sym._SYMB_23); }
+					case -32:
+						break;
+					case 32:
+						{ return new Symbol(sym._SYMB_20); }
+					case -33:
+						break;
+					case 33:
+						{ return new Symbol(sym._SYMB_25); }
+					case -34:
+						break;
+					case 34:
+						{ return new Symbol(sym._SYMB_28); }
+					case -35:
+						break;
+					case 35:
+						{ return new Symbol(sym._SYMB_27); }
+					case -36:
+						break;
+					case 36:
+						{ return new Symbol(sym._SYMB_26); }
+					case -37:
+						break;
+					case 37:
+						{ pstring += yytext(); }
+					case -38:
+						break;
+					case 38:
+						{ String foo = pstring; pstring = new String(); yybegin(YYINITIAL); return new Symbol(sym._STRING_, foo.intern()); }
+					case -39:
+						break;
+					case 39:
+						{ yybegin(ESCAPED); }
+					case -40:
+						break;
+					case 40:
+						{ pstring += yytext(); yybegin(STRING); }
+					case -41:
+						break;
+					case 41:
+						{ pstring += "\t"; yybegin(STRING); }
+					case -42:
+						break;
+					case 42:
+						{ pstring += "\""; yybegin(STRING); }
+					case -43:
+						break;
+					case 43:
+						{ pstring += "\\"; yybegin(STRING); }
+					case -44:
+						break;
+					case 44:
+						{ pstring +=  "\n"; yybegin(STRING); }
+					case -45:
+						break;
+					case 46:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -46:
+						break;
+					case 47:
+						{ return new Symbol(sym.QInteger, yytext().intern()); }
+					case -47:
+						break;
+					case 48:
+						{ return new Symbol(sym.QDouble, yytext().intern()); }
+					case -48:
+						break;
+					case 50:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -49:
+						break;
+					case 52:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -50:
+						break;
+					case 54:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -51:
+						break;
+					case 56:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -52:
+						break;
+					case 58:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -53:
+						break;
+					case 60:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -54:
+						break;
+					case 62:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -55:
+						break;
+					case 63:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -56:
+						break;
+					case 64:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -57:
+						break;
+					case 65:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -58:
+						break;
+					case 66:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -59:
+						break;
+					case 67:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -60:
+						break;
+					case 68:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -61:
+						break;
+					case 69:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -62:
+						break;
+					case 70:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -63:
+						break;
+					case 71:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -64:
+						break;
+					case 72:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -65:
+						break;
+					case 73:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -66:
+						break;
+					case 74:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -67:
+						break;
+					case 75:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -68:
+						break;
+					case 76:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -69:
+						break;
+					case 77:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -70:
+						break;
+					case 78:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -71:
+						break;
+					case 79:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -72:
+						break;
+					case 80:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -73:
+						break;
+					case 81:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -74:
+						break;
+					case 82:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -75:
+						break;
+					case 83:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -76:
+						break;
+					case 84:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -77:
+						break;
+					case 85:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -78:
+						break;
+					case 86:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -79:
+						break;
+					case 87:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -80:
+						break;
+					case 88:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -81:
+						break;
+					case 89:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -82:
+						break;
+					case 90:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -83:
+						break;
+					case 91:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -84:
+						break;
+					case 92:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -85:
+						break;
+					case 93:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -86:
+						break;
+					case 94:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -87:
+						break;
+					case 95:
+						{ return new Symbol(sym.QIdent, yytext().intern()); }
+					case -88:
+						break;
+					default:
+						yy_error(YY_E_INTERNAL,false);
+					case -1:
+					}
+					yy_initial = true;
+					yy_state = yy_state_dtrans[yy_lexical_state];
+					yy_next_state = YY_NO_STATE;
+					yy_last_accept_state = YY_NO_STATE;
+					yy_mark_start();
+					yy_this_accept = yy_acpt[yy_state];
+					if (YY_NOT_ACCEPT != yy_this_accept) {
+						yy_last_accept_state = yy_state;
+						yy_mark_end();
+					}
+				}
+			}
+		}
+	}
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/parser.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/parser.java
new file mode 100644
index 0000000..85a196b
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/parser.java
@@ -0,0 +1,923 @@
+
+//----------------------------------------------------
+// The following code was generated by CUP v0.11a beta 20060608
+// Sat Nov 16 17:39:43 CET 2013
+//----------------------------------------------------
+
+package pl.edu.mimuw.cloudatlas.interpreter.query;
+
+
+/** CUP v0.11a beta 20060608 generated parser.
+  * @version Sat Nov 16 17:39:43 CET 2013
+  */
+public class parser extends java_cup.runtime.lr_parser {
+
+  /** Default constructor. */
+  public parser() {super();}
+
+  /** Constructor which sets the default scanner. */
+  public parser(java_cup.runtime.Scanner s) {super(s);}
+
+  /** Constructor which sets the default scanner. */
+  public parser(java_cup.runtime.Scanner s, java_cup.runtime.SymbolFactory sf) {super(s,sf);}
+
+  /** Production table. */
+  protected static final short _production_table[][] = 
+    unpackFromStrings(new String[] {
+    "\000\071\000\002\002\004\000\002\002\003\000\002\002" +
+    "\005\000\002\003\003\000\002\003\005\000\002\004\003" +
+    "\000\002\004\005\000\002\005\002\000\002\005\003\000" +
+    "\002\005\005\000\002\006\003\000\002\007\006\000\002" +
+    "\010\002\000\002\010\004\000\002\011\002\000\002\011" +
+    "\005\000\002\012\005\000\002\013\003\000\002\013\003" +
+    "\000\002\013\002\000\002\014\002\000\002\014\004\000" +
+    "\002\014\004\000\002\015\003\000\002\015\005\000\002" +
+    "\016\005\000\002\016\005\000\002\016\003\000\002\017" +
+    "\005\000\002\017\003\000\002\020\005\000\002\020\003" +
+    "\000\002\021\004\000\002\021\003\000\002\022\005\000" +
+    "\002\022\005\000\002\022\003\000\002\023\005\000\002" +
+    "\023\005\000\002\023\005\000\002\023\003\000\002\024" +
+    "\004\000\002\024\003\000\002\025\003\000\002\025\003" +
+    "\000\002\025\006\000\002\025\003\000\002\025\003\000" +
+    "\002\025\003\000\002\025\005\000\002\025\005\000\002" +
+    "\026\003\000\002\026\003\000\002\026\003\000\002\026" +
+    "\003\000\002\026\003\000\002\026\003" });
+
+  /** Access to production table. */
+  public short[][] production_table() {return _production_table;}
+
+  /** Parse-action table. */
+  protected static final short[][] _action_table = 
+    unpackFromStrings(new String[] {
+    "\000\124\000\004\037\006\001\002\000\004\002\126\001" +
+    "\002\000\006\002\000\004\124\001\002\000\022\007\024" +
+    "\013\023\032\030\041\012\042\026\043\025\044\015\045" +
+    "\016\001\002\000\004\002\ufff7\001\002\000\062\002\uffd7" +
+    "\004\uffd7\005\uffd7\006\uffd7\007\uffd7\010\uffd7\011\uffd7\012" +
+    "\uffd7\014\uffd7\015\uffd7\016\uffd7\017\uffd7\020\uffd7\021\uffd7" +
+    "\022\uffd7\023\uffd7\024\uffd7\025\uffd7\027\uffd7\033\uffd7\034" +
+    "\uffd7\035\uffd7\036\uffd7\040\uffd7\001\002\000\062\002\uffd9" +
+    "\004\uffd9\005\uffd9\006\uffd9\007\uffd9\010\uffd9\011\uffd9\012" +
+    "\uffd9\014\uffd9\015\uffd9\016\uffd9\017\uffd9\020\uffd9\021\uffd9" +
+    "\022\uffd9\023\uffd9\024\uffd9\025\uffd9\027\uffd9\033\uffd9\034" +
+    "\uffd9\035\uffd9\036\uffd9\040\uffd9\001\002\000\062\002\uffd3" +
+    "\004\uffd3\005\uffd3\006\uffd3\007\uffd3\010\uffd3\011\uffd3\012" +
+    "\uffd3\014\uffd3\015\uffd3\016\uffd3\017\uffd3\020\uffd3\021\uffd3" +
+    "\022\uffd3\023\uffd3\024\uffd3\025\uffd3\027\uffd3\033\uffd3\034" +
+    "\uffd3\035\uffd3\036\uffd3\040\uffd3\001\002\000\054\002\uffe6" +
+    "\004\uffe6\005\uffe6\006\110\007\107\014\uffe6\015\117\016" +
+    "\116\017\115\020\114\021\113\022\111\023\uffe6\024\uffe6" +
+    "\025\uffe6\027\uffe6\033\uffe6\034\uffe6\035\uffe6\036\106\040" +
+    "\uffe6\001\002\000\062\002\uffdd\004\uffdd\005\uffdd\006\uffdd" +
+    "\007\uffdd\010\100\011\102\012\101\014\uffdd\015\uffdd\016" +
+    "\uffdd\017\uffdd\020\uffdd\021\uffdd\022\uffdd\023\uffdd\024\uffdd" +
+    "\025\uffdd\027\uffdd\033\uffdd\034\uffdd\035\uffdd\036\uffdd\040" +
+    "\uffdd\001\002\000\062\002\uffd1\004\uffd1\005\uffd1\006\uffd1" +
+    "\007\uffd1\010\uffd1\011\uffd1\012\uffd1\014\uffd1\015\uffd1\016" +
+    "\uffd1\017\uffd1\020\uffd1\021\uffd1\022\uffd1\023\uffd1\024\uffd1" +
+    "\025\uffd1\027\uffd1\033\uffd1\034\uffd1\035\uffd1\036\uffd1\040" +
+    "\uffd1\001\002\000\062\002\uffd2\004\uffd2\005\uffd2\006\uffd2" +
+    "\007\uffd2\010\uffd2\011\uffd2\012\uffd2\014\uffd2\015\uffd2\016" +
+    "\uffd2\017\uffd2\020\uffd2\021\uffd2\022\uffd2\023\uffd2\024\uffd2" +
+    "\025\uffd2\027\uffd2\033\uffd2\034\uffd2\035\uffd2\036\uffd2\040" +
+    "\uffd2\001\002\000\014\002\ufff5\004\ufff5\014\ufff5\035\ufff5" +
+    "\040\056\001\002\000\022\002\uffea\004\uffea\005\uffea\014" +
+    "\uffea\024\054\034\042\035\uffea\040\uffea\001\002\000\032" +
+    "\002\uffe2\004\uffe2\005\uffe2\014\uffe2\023\uffe2\024\uffe2\025" +
+    "\uffe2\027\uffe2\033\uffe2\034\uffe2\035\uffe2\040\uffe2\001\002" +
+    "\000\032\002\uffe4\004\uffe4\005\uffe4\014\uffe4\023\044\024" +
+    "\uffe4\025\uffe4\027\uffe4\033\uffe4\034\uffe4\035\uffe4\040\uffe4" +
+    "\001\002\000\024\007\024\013\023\032\030\037\006\041" +
+    "\012\042\026\043\025\044\015\045\016\001\002\000\020" +
+    "\007\024\013\023\041\012\042\026\043\025\044\015\045" +
+    "\016\001\002\000\064\002\uffd5\004\uffd5\005\uffd5\006\uffd5" +
+    "\007\uffd5\010\uffd5\011\uffd5\012\uffd5\013\035\014\uffd5\015" +
+    "\uffd5\016\uffd5\017\uffd5\020\uffd5\021\uffd5\022\uffd5\023\uffd5" +
+    "\024\uffd5\025\uffd5\027\uffd5\033\uffd5\034\uffd5\035\uffd5\036" +
+    "\uffd5\040\uffd5\001\002\000\062\002\uffd6\004\uffd6\005\uffd6" +
+    "\006\uffd6\007\uffd6\010\uffd6\011\uffd6\012\uffd6\014\uffd6\015" +
+    "\uffd6\016\uffd6\017\uffd6\020\uffd6\021\uffd6\022\uffd6\023\uffd6" +
+    "\024\uffd6\025\uffd6\027\uffd6\033\uffd6\034\uffd6\035\uffd6\036" +
+    "\uffd6\040\uffd6\001\002\000\016\002\ufffc\004\ufffc\005\033" +
+    "\014\ufffc\035\ufffc\040\ufffc\001\002\000\022\007\024\013" +
+    "\023\032\030\041\012\042\026\043\025\044\015\045\016" +
+    "\001\002\000\032\002\uffe0\004\uffe0\005\uffe0\014\uffe0\023" +
+    "\uffe0\024\uffe0\025\uffe0\027\uffe0\033\uffe0\034\uffe0\035\uffe0" +
+    "\040\uffe0\001\002\000\032\002\uffe1\004\uffe1\005\uffe1\014" +
+    "\uffe1\023\uffe1\024\uffe1\025\uffe1\027\uffe1\033\uffe1\034\uffe1" +
+    "\035\uffe1\040\uffe1\001\002\000\022\007\024\013\023\032" +
+    "\030\041\012\042\026\043\025\044\015\045\016\001\002" +
+    "\000\014\002\ufffb\004\ufffb\014\ufffb\035\ufffb\040\ufffb\001" +
+    "\002\000\024\007\024\013\023\014\ufffa\032\030\041\012" +
+    "\042\026\043\025\044\015\045\016\001\002\000\010\005" +
+    "\041\014\ufff9\034\042\001\002\000\004\014\040\001\002" +
+    "\000\062\002\uffd4\004\uffd4\005\uffd4\006\uffd4\007\uffd4\010" +
+    "\uffd4\011\uffd4\012\uffd4\014\uffd4\015\uffd4\016\uffd4\017\uffd4" +
+    "\020\uffd4\021\uffd4\022\uffd4\023\uffd4\024\uffd4\025\uffd4\027" +
+    "\uffd4\033\uffd4\034\uffd4\035\uffd4\036\uffd4\040\uffd4\001\002" +
+    "\000\024\007\024\013\023\014\ufffa\032\030\041\012\042" +
+    "\026\043\025\044\015\045\016\001\002\000\022\007\024" +
+    "\013\023\032\030\041\012\042\026\043\025\044\015\045" +
+    "\016\001\002\000\032\002\uffe5\004\uffe5\005\uffe5\014\uffe5" +
+    "\023\044\024\uffe5\025\uffe5\027\uffe5\033\uffe5\034\uffe5\035" +
+    "\uffe5\040\uffe5\001\002\000\022\007\024\013\023\032\030" +
+    "\041\012\042\026\043\025\044\015\045\016\001\002\000" +
+    "\032\002\uffe3\004\uffe3\005\uffe3\014\uffe3\023\uffe3\024\uffe3" +
+    "\025\uffe3\027\uffe3\033\uffe3\034\uffe3\035\uffe3\040\uffe3\001" +
+    "\002\000\004\014\ufff8\001\002\000\062\002\uffd8\004\uffd8" +
+    "\005\uffd8\006\uffd8\007\uffd8\010\uffd8\011\uffd8\012\uffd8\014" +
+    "\uffd8\015\uffd8\016\uffd8\017\uffd8\020\uffd8\021\uffd8\022\uffd8" +
+    "\023\uffd8\024\uffd8\025\uffd8\027\uffd8\033\uffd8\034\uffd8\035" +
+    "\uffd8\036\uffd8\040\uffd8\001\002\000\006\014\053\034\042" +
+    "\001\002\000\004\014\052\001\002\000\062\002\uffcf\004" +
+    "\uffcf\005\uffcf\006\uffcf\007\uffcf\010\uffcf\011\uffcf\012\uffcf" +
+    "\014\uffcf\015\uffcf\016\uffcf\017\uffcf\020\uffcf\021\uffcf\022" +
+    "\uffcf\023\uffcf\024\uffcf\025\uffcf\027\uffcf\033\uffcf\034\uffcf" +
+    "\035\uffcf\036\uffcf\040\uffcf\001\002\000\062\002\uffd0\004" +
+    "\uffd0\005\uffd0\006\uffd0\007\uffd0\010\uffd0\011\uffd0\012\uffd0" +
+    "\014\uffd0\015\uffd0\016\uffd0\017\uffd0\020\uffd0\021\uffd0\022" +
+    "\uffd0\023\uffd0\024\uffd0\025\uffd0\027\uffd0\033\uffd0\034\uffd0" +
+    "\035\uffd0\036\uffd0\040\uffd0\001\002\000\004\043\055\001" +
+    "\002\000\016\002\uffe9\004\uffe9\005\uffe9\014\uffe9\035\uffe9" +
+    "\040\uffe9\001\002\000\022\007\024\013\023\032\030\041" +
+    "\012\042\026\043\025\044\015\045\016\001\002\000\012" +
+    "\002\ufff3\004\ufff3\014\ufff3\035\061\001\002\000\010\002" +
+    "\ufff6\004\ufff6\014\ufff6\001\002\000\004\026\062\001\002" +
+    "\000\022\007\024\013\023\032\030\041\012\042\026\043" +
+    "\025\044\015\045\016\001\002\000\012\002\ufffe\004\ufffe" +
+    "\005\075\014\ufffe\001\002\000\022\002\uffee\004\uffee\005" +
+    "\uffee\014\uffee\025\067\027\066\033\uffee\034\042\001\002" +
+    "\000\010\002\ufff2\004\ufff2\014\ufff2\001\002\000\014\002" +
+    "\uffef\004\uffef\005\uffef\014\uffef\033\uffef\001\002\000\014" +
+    "\002\ufff0\004\ufff0\005\ufff0\014\ufff0\033\ufff0\001\002\000" +
+    "\014\002\uffed\004\uffed\005\uffed\014\uffed\033\072\001\002" +
+    "\000\012\002\ufff1\004\ufff1\005\ufff1\014\ufff1\001\002\000" +
+    "\006\030\074\031\073\001\002\000\012\002\uffeb\004\uffeb" +
+    "\005\uffeb\014\uffeb\001\002\000\012\002\uffec\004\uffec\005" +
+    "\uffec\014\uffec\001\002\000\022\007\024\013\023\032\030" +
+    "\041\012\042\026\043\025\044\015\045\016\001\002\000" +
+    "\010\002\ufffd\004\ufffd\014\ufffd\001\002\000\014\002\ufff4" +
+    "\004\ufff4\014\ufff4\034\042\035\ufff4\001\002\000\020\007" +
+    "\024\013\023\041\012\042\026\043\025\044\015\045\016" +
+    "\001\002\000\020\007\024\013\023\041\012\042\026\043" +
+    "\025\044\015\045\016\001\002\000\020\007\024\013\023" +
+    "\041\012\042\026\043\025\044\015\045\016\001\002\000" +
+    "\062\002\uffdb\004\uffdb\005\uffdb\006\uffdb\007\uffdb\010\uffdb" +
+    "\011\uffdb\012\uffdb\014\uffdb\015\uffdb\016\uffdb\017\uffdb\020" +
+    "\uffdb\021\uffdb\022\uffdb\023\uffdb\024\uffdb\025\uffdb\027\uffdb" +
+    "\033\uffdb\034\uffdb\035\uffdb\036\uffdb\040\uffdb\001\002\000" +
+    "\062\002\uffda\004\uffda\005\uffda\006\uffda\007\uffda\010\uffda" +
+    "\011\uffda\012\uffda\014\uffda\015\uffda\016\uffda\017\uffda\020" +
+    "\uffda\021\uffda\022\uffda\023\uffda\024\uffda\025\uffda\027\uffda" +
+    "\033\uffda\034\uffda\035\uffda\036\uffda\040\uffda\001\002\000" +
+    "\062\002\uffdc\004\uffdc\005\uffdc\006\uffdc\007\uffdc\010\uffdc" +
+    "\011\uffdc\012\uffdc\014\uffdc\015\uffdc\016\uffdc\017\uffdc\020" +
+    "\uffdc\021\uffdc\022\uffdc\023\uffdc\024\uffdc\025\uffdc\027\uffdc" +
+    "\033\uffdc\034\uffdc\035\uffdc\036\uffdc\040\uffdc\001\002\000" +
+    "\004\041\123\001\002\000\020\007\024\013\023\041\012" +
+    "\042\026\043\025\044\015\045\016\001\002\000\020\007" +
+    "\024\013\023\041\012\042\026\043\025\044\015\045\016" +
+    "\001\002\000\020\007\uffc9\013\uffc9\041\uffc9\042\uffc9\043" +
+    "\uffc9\044\uffc9\045\uffc9\001\002\000\020\007\024\013\023" +
+    "\041\012\042\026\043\025\044\015\045\016\001\002\000" +
+    "\020\007\uffca\013\uffca\041\uffca\042\uffca\043\uffca\044\uffca" +
+    "\045\uffca\001\002\000\020\007\uffcb\013\uffcb\041\uffcb\042" +
+    "\uffcb\043\uffcb\044\uffcb\045\uffcb\001\002\000\020\007\uffcc" +
+    "\013\uffcc\041\uffcc\042\uffcc\043\uffcc\044\uffcc\045\uffcc\001" +
+    "\002\000\020\007\uffcd\013\uffcd\041\uffcd\042\uffcd\043\uffcd" +
+    "\044\uffcd\045\uffcd\001\002\000\020\007\uffce\013\uffce\041" +
+    "\uffce\042\uffce\043\uffce\044\uffce\045\uffce\001\002\000\036" +
+    "\002\uffe8\004\uffe8\005\uffe8\006\110\007\107\014\uffe8\023" +
+    "\uffe8\024\uffe8\025\uffe8\027\uffe8\033\uffe8\034\uffe8\035\uffe8" +
+    "\040\uffe8\001\002\000\062\002\uffdf\004\uffdf\005\uffdf\006" +
+    "\uffdf\007\uffdf\010\100\011\102\012\101\014\uffdf\015\uffdf" +
+    "\016\uffdf\017\uffdf\020\uffdf\021\uffdf\022\uffdf\023\uffdf\024" +
+    "\uffdf\025\uffdf\027\uffdf\033\uffdf\034\uffdf\035\uffdf\036\uffdf" +
+    "\040\uffdf\001\002\000\062\002\uffde\004\uffde\005\uffde\006" +
+    "\uffde\007\uffde\010\100\011\102\012\101\014\uffde\015\uffde" +
+    "\016\uffde\017\uffde\020\uffde\021\uffde\022\uffde\023\uffde\024" +
+    "\uffde\025\uffde\027\uffde\033\uffde\034\uffde\035\uffde\036\uffde" +
+    "\040\uffde\001\002\000\032\002\uffe7\004\uffe7\005\uffe7\014" +
+    "\uffe7\023\uffe7\024\uffe7\025\uffe7\027\uffe7\033\uffe7\034\uffe7" +
+    "\035\uffe7\040\uffe7\001\002\000\004\037\006\001\002\000" +
+    "\004\002\uffff\001\002\000\004\002\001\001\002" });
+
+  /** Access to parse-action table. */
+  public short[][] action_table() {return _action_table;}
+
+  /** <code>reduce_goto</code> table. */
+  protected static final short[][] _reduce_table = 
+    unpackFromStrings(new String[] {
+    "\000\124\000\010\002\006\006\003\007\004\001\001\000" +
+    "\002\001\001\000\002\001\001\000\026\004\016\015\026" +
+    "\016\030\017\017\020\021\021\020\022\012\023\013\024" +
+    "\010\025\007\001\001\000\002\001\001\000\002\001\001" +
+    "\000\002\001\001\000\002\001\001\000\004\026\111\001" +
+    "\001\000\002\001\001\000\002\001\001\000\002\001\001" +
+    "\000\004\010\056\001\001\000\002\001\001\000\002\001" +
+    "\001\000\002\001\001\000\024\007\050\016\030\017\047" +
+    "\020\021\021\020\022\012\023\013\024\010\025\007\001" +
+    "\001\000\006\024\046\025\007\001\001\000\002\001\001" +
+    "\000\002\001\001\000\002\001\001\000\016\016\030\021" +
+    "\031\022\012\023\013\024\010\025\007\001\001\000\002" +
+    "\001\001\000\002\001\001\000\026\004\033\015\026\016" +
+    "\030\017\017\020\021\021\020\022\012\023\013\024\010" +
+    "\025\007\001\001\000\002\001\001\000\024\005\036\016" +
+    "\030\017\035\020\021\021\020\022\012\023\013\024\010" +
+    "\025\007\001\001\000\002\001\001\000\002\001\001\000" +
+    "\002\001\001\000\024\005\045\016\030\017\035\020\021" +
+    "\021\020\022\012\023\013\024\010\025\007\001\001\000" +
+    "\020\016\030\020\042\021\020\022\012\023\013\024\010" +
+    "\025\007\001\001\000\002\001\001\000\016\016\030\021" +
+    "\044\022\012\023\013\024\010\025\007\001\001\000\002" +
+    "\001\001\000\002\001\001\000\002\001\001\000\002\001" +
+    "\001\000\002\001\001\000\002\001\001\000\002\001\001" +
+    "\000\002\001\001\000\002\001\001\000\022\016\030\017" +
+    "\076\020\021\021\020\022\012\023\013\024\010\025\007" +
+    "\001\001\000\004\011\057\001\001\000\002\001\001\000" +
+    "\002\001\001\000\026\003\064\012\062\016\030\017\063" +
+    "\020\021\021\020\022\012\023\013\024\010\025\007\001" +
+    "\001\000\002\001\001\000\004\013\067\001\001\000\002" +
+    "\001\001\000\002\001\001\000\002\001\001\000\004\014" +
+    "\070\001\001\000\002\001\001\000\002\001\001\000\002" +
+    "\001\001\000\002\001\001\000\026\003\075\012\062\016" +
+    "\030\017\063\020\021\021\020\022\012\023\013\024\010" +
+    "\025\007\001\001\000\002\001\001\000\002\001\001\000" +
+    "\006\024\104\025\007\001\001\000\006\024\103\025\007" +
+    "\001\001\000\006\024\102\025\007\001\001\000\002\001" +
+    "\001\000\002\001\001\000\002\001\001\000\002\001\001" +
+    "\000\010\023\121\024\010\025\007\001\001\000\010\023" +
+    "\120\024\010\025\007\001\001\000\002\001\001\000\012" +
+    "\022\117\023\013\024\010\025\007\001\001\000\002\001" +
+    "\001\000\002\001\001\000\002\001\001\000\002\001\001" +
+    "\000\002\001\001\000\002\001\001\000\002\001\001\000" +
+    "\002\001\001\000\002\001\001\000\006\002\124\007\004" +
+    "\001\001\000\002\001\001\000\002\001\001" });
+
+  /** Access to <code>reduce_goto</code> table. */
+  public short[][] reduce_table() {return _reduce_table;}
+
+  /** Instance of action encapsulation class. */
+  protected CUP$parser$actions action_obj;
+
+  /** Action encapsulation object initializer. */
+  protected void init_actions()
+    {
+      action_obj = new CUP$parser$actions(this);
+    }
+
+  /** Invoke a user supplied parse action. */
+  public java_cup.runtime.Symbol do_action(
+    int                        act_num,
+    java_cup.runtime.lr_parser parser,
+    @SuppressWarnings("rawtypes") java.util.Stack            stack,
+    int                        top)
+    throws java.lang.Exception
+  {
+    /* call code in generated class */
+    return action_obj.CUP$parser$do_action(act_num, parser, stack, top);
+  }
+
+  /** Indicates start state. */
+  public int start_state() {return 0;}
+  /** Indicates start production. */
+  public int start_production() {return 0;}
+
+  /** <code>EOF</code> Symbol index. */
+  public int EOF_sym() {return 0;}
+
+  /** <code>error</code> Symbol index. */
+  public int error_sym() {return 1;}
+
+
+
+  public pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Program pProgram() throws Exception
+  {
+	java_cup.runtime.Symbol res = parse();
+	return (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Program) res.value;
+  }
+
+public <B,A extends java.util.LinkedList<? super B>> A cons_(B x, A xs) { xs.addFirst(x); return xs; }
+
+public void syntax_error(java_cup.runtime.Symbol cur_token)
+{
+	report_error("Syntax Error, trying to recover and continue parse...", cur_token);
+}
+
+public void unrecovered_syntax_error(java_cup.runtime.Symbol cur_token) throws java.lang.Exception
+{
+	throw new Exception("Unrecoverable Syntax Error");
+}
+
+
+}
+
+/** Cup generated class to encapsulate user supplied action code.*/
+class CUP$parser$actions {
+  private final parser parser;
+
+  /** Constructor */
+  CUP$parser$actions(parser parser) {
+    this.parser = parser;
+  }
+
+  /** Method with the actual generated action code. */
+  public final java_cup.runtime.Symbol CUP$parser$do_action(
+    int                        CUP$parser$act_num,
+    java_cup.runtime.lr_parser CUP$parser$parser,
+    @SuppressWarnings("rawtypes") java.util.Stack            CUP$parser$stack,
+    int                        CUP$parser$top)
+    throws java.lang.Exception
+    {
+      /* Symbol object for return from actions */
+      java_cup.runtime.Symbol CUP$parser$result;
+
+      /* select the action based on the action number */
+      switch (CUP$parser$act_num)
+        {
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 56: // RelOp ::= _SYMB_14 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOp RESULT =null;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpGeC(); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("RelOp",20, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 55: // RelOp ::= _SYMB_13 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOp RESULT =null;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpLeC(); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("RelOp",20, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 54: // RelOp ::= _SYMB_12 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOp RESULT =null;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpLtC(); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("RelOp",20, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 53: // RelOp ::= _SYMB_11 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOp RESULT =null;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpNeC(); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("RelOp",20, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 52: // RelOp ::= _SYMB_10 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOp RESULT =null;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpEqC(); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("RelOp",20, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 51: // RelOp ::= _SYMB_9 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOp RESULT =null;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOpGtC(); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("RelOp",20, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 50: // BasicExpr3 ::= _SYMB_7 Statement _SYMB_8 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Statement p_2 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Statement)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-1)).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EStmtC(p_2); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("BasicExpr3",19, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 49: // BasicExpr3 ::= _SYMB_7 CondExpr _SYMB_8 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr p_2 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-1)).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ECondExprC(p_2); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("BasicExpr3",19, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 48: // BasicExpr3 ::= QDouble 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr RESULT =null;
+		String p_1 = (String)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EDblC(p_1); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("BasicExpr3",19, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 47: // BasicExpr3 ::= QInteger 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr RESULT =null;
+		String p_1 = (String)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EIntC(p_1); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("BasicExpr3",19, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 46: // BasicExpr3 ::= _STRING_ 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr RESULT =null;
+		String p_1 = (String)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EStrC(p_1); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("BasicExpr3",19, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 45: // BasicExpr3 ::= QIdent _SYMB_7 ListCondExpr _SYMB_8 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr RESULT =null;
+		String p_1 = (String)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-3)).value;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListCondExpr p_3 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListCondExpr)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-1)).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EFunC(p_1,p_3); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("BasicExpr3",19, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 44: // BasicExpr3 ::= QIdent 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr RESULT =null;
+		String p_1 = (String)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EIdentC(p_1); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("BasicExpr3",19, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 43: // BasicExpr3 ::= QBool 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr RESULT =null;
+		String p_1 = (String)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.EBoolC(p_1); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("BasicExpr3",19, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 42: // BasicExpr2 ::= BasicExpr3 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = p_1; 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("BasicExpr2",18, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 41: // BasicExpr2 ::= _SYMB_3 BasicExpr2 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr p_2 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprNegC(p_2); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("BasicExpr2",18, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 40: // BasicExpr1 ::= BasicExpr2 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = p_1; 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("BasicExpr1",17, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 39: // BasicExpr1 ::= BasicExpr1 _SYMB_6 BasicExpr2 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr p_3 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprModC(p_1,p_3); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("BasicExpr1",17, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 38: // BasicExpr1 ::= BasicExpr1 _SYMB_5 BasicExpr2 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr p_3 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprDivC(p_1,p_3); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("BasicExpr1",17, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 37: // BasicExpr1 ::= BasicExpr1 _SYMB_4 BasicExpr2 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr p_3 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprMulC(p_1,p_3); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("BasicExpr1",17, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 36: // BasicExpr ::= BasicExpr1 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = p_1; 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("BasicExpr",16, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 35: // BasicExpr ::= BasicExpr _SYMB_3 BasicExpr1 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr p_3 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprSubC(p_1,p_3); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("BasicExpr",16, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 34: // BasicExpr ::= BasicExpr _SYMB_2 BasicExpr1 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr p_3 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExprAddC(p_1,p_3); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("BasicExpr",16, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 33: // CondExpr2 ::= BoolExpr 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExpr p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExpr)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprBoolExprC(p_1); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("CondExpr2",15, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 32: // CondExpr2 ::= _SYMB_22 CondExpr2 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr p_2 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprNotC(p_2); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("CondExpr2",15, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 31: // CondExpr1 ::= CondExpr2 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = p_1; 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("CondExpr1",14, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 30: // CondExpr1 ::= CondExpr1 _SYMB_15 CondExpr2 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr p_3 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprAndC(p_1,p_3); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("CondExpr1",14, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 29: // CondExpr ::= CondExpr1 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = p_1; 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("CondExpr",13, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 28: // CondExpr ::= CondExpr _SYMB_24 CondExpr1 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr p_3 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExprOrC(p_1,p_3); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("CondExpr",13, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 27: // BoolExpr ::= BasicExpr 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExpr RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprBasicExprC(p_1); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("BoolExpr",12, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 26: // BoolExpr ::= BasicExpr _SYMB_26 _STRING_ 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExpr RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;
+		String p_3 = (String)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprRegExpC(p_1,p_3); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("BoolExpr",12, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 25: // BoolExpr ::= BasicExpr RelOp BasicExpr 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExpr RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOp p_2 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.RelOp)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-1)).value;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr p_3 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BasicExpr)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.BoolExprCmpC(p_1,p_2,p_3); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("BoolExpr",12, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 24: // SelItem ::= CondExpr _SYMB_16 QIdent 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItem RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;
+		String p_3 = (String)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.AliasedSelItemC(p_1,p_3); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("SelItem",11, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 23: // SelItem ::= CondExpr 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItem RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItemC(p_1); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("SelItem",11, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 22: // Nulls ::= _SYMB_23 _SYMB_21 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Nulls RESULT =null;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NullsLastC(); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("Nulls",10, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 21: // Nulls ::= _SYMB_23 _SYMB_20 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Nulls RESULT =null;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NullFirstsC(); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("Nulls",10, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 20: // Nulls ::= 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Nulls RESULT =null;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NoNullsC(); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("Nulls",10, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 19: // Order ::= 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Order RESULT =null;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NoOrderC(); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("Order",9, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 18: // Order ::= _SYMB_19 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Order RESULT =null;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.DescOrderC(); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("Order",9, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 17: // Order ::= _SYMB_17 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Order RESULT =null;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.AscOrderC(); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("Order",9, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 16: // OrderItem ::= CondExpr Order Nulls 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderItem RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Order p_2 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Order)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-1)).value;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Nulls p_3 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Nulls)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderItemC(p_1,p_2,p_3); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("OrderItem",8, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 15: // OrderBy ::= _SYMB_25 _SYMB_18 ListOrderItem 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderBy RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListOrderItem p_3 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListOrderItem)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderByC(p_3); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("OrderBy",7, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 14: // OrderBy ::= 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderBy RESULT =null;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NoOrderByC(); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("OrderBy",7, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 13: // Where ::= _SYMB_28 CondExpr 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Where RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr p_2 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.WhereC(p_2); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("Where",6, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 12: // Where ::= 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Where RESULT =null;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.NoWhereC(); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("Where",6, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 11: // Statement ::= _SYMB_27 ListSelItem Where OrderBy 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Statement RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListSelItem p_2 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListSelItem)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Where p_3 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Where)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-1)).value;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderBy p_4 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderBy)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.StatementC(p_2,p_3,p_4); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("Statement",5, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 10: // Program ::= ListStatement 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Program RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListStatement p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListStatement)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ProgramC(p_1); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("Program",4, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 9: // ListCondExpr ::= CondExpr _SYMB_1 ListCondExpr 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListCondExpr RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListCondExpr p_3 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListCondExpr)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = p_3; p_3.addFirst(p_1); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("ListCondExpr",3, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 8: // ListCondExpr ::= CondExpr 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListCondExpr RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.CondExpr)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListCondExpr(); RESULT.addLast(p_1); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("ListCondExpr",3, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 7: // ListCondExpr ::= 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListCondExpr RESULT =null;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListCondExpr(); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("ListCondExpr",3, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 6: // ListSelItem ::= SelItem _SYMB_1 ListSelItem 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListSelItem RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItem p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItem)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListSelItem p_3 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListSelItem)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = p_3; p_3.addFirst(p_1); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("ListSelItem",2, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 5: // ListSelItem ::= SelItem 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListSelItem RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItem p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.SelItem)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListSelItem(); RESULT.addLast(p_1); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("ListSelItem",2, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 4: // ListOrderItem ::= OrderItem _SYMB_1 ListOrderItem 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListOrderItem RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderItem p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderItem)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListOrderItem p_3 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListOrderItem)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = p_3; p_3.addFirst(p_1); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("ListOrderItem",1, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 3: // ListOrderItem ::= OrderItem 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListOrderItem RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderItem p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.OrderItem)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListOrderItem(); RESULT.addLast(p_1); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("ListOrderItem",1, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 2: // ListStatement ::= Statement _SYMB_0 ListStatement 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListStatement RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Statement p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Statement)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListStatement p_3 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListStatement)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = p_3; p_3.addFirst(p_1); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("ListStatement",0, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 1: // ListStatement ::= Statement 
+            {
+              pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListStatement RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Statement p_1 = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Statement)((java_cup.runtime.Symbol) CUP$parser$stack.peek()).value;
+		 RESULT = new pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.ListStatement(); RESULT.addLast(p_1); 
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("ListStatement",0, RESULT);
+            }
+          return CUP$parser$result;
+
+          /*. . . . . . . . . . . . . . . . . . . .*/
+          case 0: // $START ::= Program EOF 
+            {
+              Object RESULT =null;
+		pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Program start_val = (pl.edu.mimuw.cloudatlas.interpreter.query.Absyn.Program)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-1)).value;
+		RESULT = start_val;
+              CUP$parser$result = parser.getSymbolFactory().newSymbol("$START",0, RESULT);
+            }
+          /* ACCEPT */
+          CUP$parser$parser.done_parsing();
+          return CUP$parser$result;
+
+          /* . . . . . .*/
+          default:
+            throw new Exception(
+               "Invalid action number found in internal parse table");
+
+        }
+    }
+}
+
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/query.cup b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/query.cup
new file mode 100644
index 0000000..6460d78
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/query.cup
@@ -0,0 +1,169 @@
+// -*- Java -*- This Cup file was machine-generated by BNFC
+package pl.edu.mimuw.mmws.cloudatlas.query;
+
+parser code {:
+  public pl.edu.mimuw.mmws.cloudatlas.query.Absyn.Program pProgram() throws Exception
+  {
+	java_cup.runtime.Symbol res = parse();
+	return (pl.edu.mimuw.mmws.cloudatlas.query.Absyn.Program) res.value;
+  }
+
+public <B,A extends java.util.LinkedList<? super B>> A cons_(B x, A xs) { xs.addFirst(x); return xs; }
+
+public void syntax_error(java_cup.runtime.Symbol cur_token)
+{
+	report_error("Syntax Error, trying to recover and continue parse...", cur_token);
+}
+
+public void unrecovered_syntax_error(java_cup.runtime.Symbol cur_token) throws java.lang.Exception
+{
+	throw new Exception("Unrecoverable Syntax Error");
+}
+
+:}
+
+nonterminal pl.edu.mimuw.mmws.cloudatlas.query.Absyn.ListStatement ListStatement;
+nonterminal pl.edu.mimuw.mmws.cloudatlas.query.Absyn.ListOrderItem ListOrderItem;
+nonterminal pl.edu.mimuw.mmws.cloudatlas.query.Absyn.ListSelItem ListSelItem;
+nonterminal pl.edu.mimuw.mmws.cloudatlas.query.Absyn.ListCondExpr ListCondExpr;
+nonterminal pl.edu.mimuw.mmws.cloudatlas.query.Absyn.Program Program;
+nonterminal pl.edu.mimuw.mmws.cloudatlas.query.Absyn.Statement Statement;
+nonterminal pl.edu.mimuw.mmws.cloudatlas.query.Absyn.Where Where;
+nonterminal pl.edu.mimuw.mmws.cloudatlas.query.Absyn.OrderBy OrderBy;
+nonterminal pl.edu.mimuw.mmws.cloudatlas.query.Absyn.OrderItem OrderItem;
+nonterminal pl.edu.mimuw.mmws.cloudatlas.query.Absyn.Order Order;
+nonterminal pl.edu.mimuw.mmws.cloudatlas.query.Absyn.Nulls Nulls;
+nonterminal pl.edu.mimuw.mmws.cloudatlas.query.Absyn.SelItem SelItem;
+nonterminal pl.edu.mimuw.mmws.cloudatlas.query.Absyn.BoolExpr BoolExpr;
+nonterminal pl.edu.mimuw.mmws.cloudatlas.query.Absyn.CondExpr CondExpr;
+nonterminal pl.edu.mimuw.mmws.cloudatlas.query.Absyn.CondExpr CondExpr1;
+nonterminal pl.edu.mimuw.mmws.cloudatlas.query.Absyn.CondExpr CondExpr2;
+nonterminal pl.edu.mimuw.mmws.cloudatlas.query.Absyn.BasicExpr BasicExpr;
+nonterminal pl.edu.mimuw.mmws.cloudatlas.query.Absyn.BasicExpr BasicExpr1;
+nonterminal pl.edu.mimuw.mmws.cloudatlas.query.Absyn.BasicExpr BasicExpr2;
+nonterminal pl.edu.mimuw.mmws.cloudatlas.query.Absyn.BasicExpr BasicExpr3;
+nonterminal pl.edu.mimuw.mmws.cloudatlas.query.Absyn.RelOp RelOp;
+
+terminal _SYMB_0;    //   ;
+terminal _SYMB_1;    //   ,
+terminal _SYMB_2;    //   +
+terminal _SYMB_3;    //   -
+terminal _SYMB_4;    //   *
+terminal _SYMB_5;    //   /
+terminal _SYMB_6;    //   %
+terminal _SYMB_7;    //   (
+terminal _SYMB_8;    //   )
+terminal _SYMB_9;    //   >
+terminal _SYMB_10;    //   =
+terminal _SYMB_11;    //   <>
+terminal _SYMB_12;    //   <
+terminal _SYMB_13;    //   <=
+terminal _SYMB_14;    //   >=
+terminal _SYMB_15;    //   AND
+terminal _SYMB_16;    //   AS
+terminal _SYMB_17;    //   ASC
+terminal _SYMB_18;    //   BY
+terminal _SYMB_19;    //   DESC
+terminal _SYMB_20;    //   FIRST
+terminal _SYMB_21;    //   LAST
+terminal _SYMB_22;    //   NOT
+terminal _SYMB_23;    //   NULLS
+terminal _SYMB_24;    //   OR
+terminal _SYMB_25;    //   ORDER
+terminal _SYMB_26;    //   REGEXP
+terminal _SYMB_27;    //   SELECT
+terminal _SYMB_28;    //   WHERE
+
+terminal String _STRING_;
+
+
+
+
+
+terminal String QBool;
+terminal String QIdent;
+terminal String QDouble;
+terminal String QInteger;
+
+
+start with Program;
+
+
+ListStatement ::= Statement:p_1  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.ListStatement(); RESULT.addLast(p_1); :} 
+  | Statement:p_1 _SYMB_0 ListStatement:p_3  {: RESULT = p_3; p_3.addFirst(p_1); :}
+;
+ListOrderItem ::= OrderItem:p_1  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.ListOrderItem(); RESULT.addLast(p_1); :} 
+  | OrderItem:p_1 _SYMB_1 ListOrderItem:p_3  {: RESULT = p_3; p_3.addFirst(p_1); :}
+;
+ListSelItem ::= SelItem:p_1  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.ListSelItem(); RESULT.addLast(p_1); :} 
+  | SelItem:p_1 _SYMB_1 ListSelItem:p_3  {: RESULT = p_3; p_3.addFirst(p_1); :}
+;
+ListCondExpr ::=  /* empty */  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.ListCondExpr(); :} 
+  | CondExpr:p_1  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.ListCondExpr(); RESULT.addLast(p_1); :}
+  | CondExpr:p_1 _SYMB_1 ListCondExpr:p_3  {: RESULT = p_3; p_3.addFirst(p_1); :}
+;
+Program ::= ListStatement:p_1  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.ProgramC(p_1); :} 
+;
+Statement ::= _SYMB_27 ListSelItem:p_2 Where:p_3 OrderBy:p_4  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.StatementC(p_2,p_3,p_4); :} 
+;
+Where ::=  /* empty */  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.NoWhereC(); :} 
+  | _SYMB_28 CondExpr:p_2  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.WhereC(p_2); :}
+;
+OrderBy ::=  /* empty */  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.NoOrderByC(); :} 
+  | _SYMB_25 _SYMB_18 ListOrderItem:p_3  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.OrderByC(p_3); :}
+;
+OrderItem ::= CondExpr:p_1 Order:p_2 Nulls:p_3  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.OrderItemC(p_1,p_2,p_3); :} 
+;
+Order ::= _SYMB_17  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.AscOrderC(); :} 
+  | _SYMB_19  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.DescOrderC(); :}
+  |  /* empty */  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.NoOrderC(); :}
+;
+Nulls ::=  /* empty */  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.NoNullsC(); :} 
+  | _SYMB_23 _SYMB_20  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.NullFirstsC(); :}
+  | _SYMB_23 _SYMB_21  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.NullsLastC(); :}
+;
+SelItem ::= CondExpr:p_1  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.SelItemC(p_1); :} 
+  | CondExpr:p_1 _SYMB_16 QIdent:p_3  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.AliasedSelItemC(p_1,p_3); :}
+;
+BoolExpr ::= BasicExpr:p_1 RelOp:p_2 BasicExpr:p_3  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.BoolExprCmpC(p_1,p_2,p_3); :} 
+  | BasicExpr:p_1 _SYMB_26 _STRING_:p_3  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.BoolExprRegExpC(p_1,p_3); :}
+  | BasicExpr:p_1  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.BoolExprBasicExprC(p_1); :}
+;
+CondExpr ::= CondExpr:p_1 _SYMB_24 CondExpr1:p_3  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.CondExprOrC(p_1,p_3); :} 
+  | CondExpr1:p_1  {: RESULT = p_1; :}
+;
+CondExpr1 ::= CondExpr1:p_1 _SYMB_15 CondExpr2:p_3  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.CondExprAndC(p_1,p_3); :} 
+  | CondExpr2:p_1  {: RESULT = p_1; :}
+;
+CondExpr2 ::= _SYMB_22 CondExpr2:p_2  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.CondExprNotC(p_2); :} 
+  | BoolExpr:p_1  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.CondExprBoolExprC(p_1); :}
+;
+BasicExpr ::= BasicExpr:p_1 _SYMB_2 BasicExpr1:p_3  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.BasicExprAddC(p_1,p_3); :} 
+  | BasicExpr:p_1 _SYMB_3 BasicExpr1:p_3  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.BasicExprSubC(p_1,p_3); :}
+  | BasicExpr1:p_1  {: RESULT = p_1; :}
+;
+BasicExpr1 ::= BasicExpr1:p_1 _SYMB_4 BasicExpr2:p_3  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.BasicExprMulC(p_1,p_3); :} 
+  | BasicExpr1:p_1 _SYMB_5 BasicExpr2:p_3  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.BasicExprDivC(p_1,p_3); :}
+  | BasicExpr1:p_1 _SYMB_6 BasicExpr2:p_3  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.BasicExprModC(p_1,p_3); :}
+  | BasicExpr2:p_1  {: RESULT = p_1; :}
+;
+BasicExpr2 ::= _SYMB_3 BasicExpr2:p_2  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.BasicExprNegC(p_2); :} 
+  | BasicExpr3:p_1  {: RESULT = p_1; :}
+;
+BasicExpr3 ::= QBool:p_1  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.EBoolC(p_1); :} 
+  | QIdent:p_1  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.EIdentC(p_1); :}
+  | QIdent:p_1 _SYMB_7 ListCondExpr:p_3 _SYMB_8  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.EFunC(p_1,p_3); :}
+  | _STRING_:p_1  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.EStrC(p_1); :}
+  | QInteger:p_1  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.EIntC(p_1); :}
+  | QDouble:p_1  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.EDblC(p_1); :}
+  | _SYMB_7 CondExpr:p_2 _SYMB_8  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.ECondExprC(p_2); :}
+  | _SYMB_7 Statement:p_2 _SYMB_8  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.EStmtC(p_2); :}
+;
+RelOp ::= _SYMB_9  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.RelOpGtC(); :} 
+  | _SYMB_10  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.RelOpEqC(); :}
+  | _SYMB_11  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.RelOpNeC(); :}
+  | _SYMB_12  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.RelOpLtC(); :}
+  | _SYMB_13  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.RelOpLeC(); :}
+  | _SYMB_14  {: RESULT = new pl.edu.mimuw.mmws.cloudatlas.query.Absyn.RelOpGeC(); :}
+;
+
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/sym.java b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/sym.java
new file mode 100644
index 0000000..34b6cc7
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/interpreter/query/sym.java
@@ -0,0 +1,49 @@
+
+//----------------------------------------------------
+// The following code was generated by CUP v0.11a beta 20060608
+// Sat Nov 16 17:39:43 CET 2013
+//----------------------------------------------------
+
+package pl.edu.mimuw.cloudatlas.interpreter.query;
+
+/** CUP generated class containing symbol constants. */
+public class sym {
+  /* terminals */
+  public static final int _SYMB_18 = 20;
+  public static final int _SYMB_17 = 19;
+  public static final int _SYMB_16 = 18;
+  public static final int _SYMB_15 = 17;
+  public static final int _SYMB_14 = 16;
+  public static final int _SYMB_13 = 15;
+  public static final int QIdent = 33;
+  public static final int _SYMB_12 = 14;
+  public static final int _SYMB_11 = 13;
+  public static final int _SYMB_9 = 11;
+  public static final int _SYMB_8 = 10;
+  public static final int _SYMB_10 = 12;
+  public static final int _SYMB_7 = 9;
+  public static final int _SYMB_6 = 8;
+  public static final int _SYMB_5 = 7;
+  public static final int _SYMB_4 = 6;
+  public static final int _SYMB_3 = 5;
+  public static final int _SYMB_2 = 4;
+  public static final int _SYMB_1 = 3;
+  public static final int _SYMB_0 = 2;
+  public static final int QDouble = 34;
+  public static final int _STRING_ = 31;
+  public static final int EOF = 0;
+  public static final int error = 1;
+  public static final int _SYMB_28 = 30;
+  public static final int _SYMB_27 = 29;
+  public static final int _SYMB_26 = 28;
+  public static final int _SYMB_25 = 27;
+  public static final int QBool = 32;
+  public static final int _SYMB_24 = 26;
+  public static final int _SYMB_23 = 25;
+  public static final int _SYMB_22 = 24;
+  public static final int _SYMB_21 = 23;
+  public static final int _SYMB_20 = 22;
+  public static final int QInteger = 35;
+  public static final int _SYMB_19 = 21;
+}
+