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From ima...@apache.org
Subject [37/51] [partial] incubator-asterixdb git commit: Change folder structure for Java repackage
Date Tue, 25 Aug 2015 16:44:25 GMT
http://git-wip-us.apache.org/repos/asf/incubator-asterixdb/blob/34d81630/asterix-algebra/src/main/java/edu/uci/ics/asterix/translator/AqlPlusExpressionToPlanTranslator.java
----------------------------------------------------------------------
diff --git a/asterix-algebra/src/main/java/edu/uci/ics/asterix/translator/AqlPlusExpressionToPlanTranslator.java b/asterix-algebra/src/main/java/edu/uci/ics/asterix/translator/AqlPlusExpressionToPlanTranslator.java
deleted file mode 100644
index 7bfa056..0000000
--- a/asterix-algebra/src/main/java/edu/uci/ics/asterix/translator/AqlPlusExpressionToPlanTranslator.java
+++ /dev/null
@@ -1,1498 +0,0 @@
-/*
- * Copyright 2009-2013 by The Regents of the University of California
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * you may obtain a copy of the License from
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package edu.uci.ics.asterix.translator;
-
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.Iterator;
-import java.util.List;
-import java.util.logging.Logger;
-
-import org.apache.commons.lang3.mutable.Mutable;
-import org.apache.commons.lang3.mutable.MutableObject;
-
-import edu.uci.ics.asterix.aql.base.Clause;
-import edu.uci.ics.asterix.aql.base.Expression;
-import edu.uci.ics.asterix.aql.base.Expression.Kind;
-import edu.uci.ics.asterix.aql.expression.CallExpr;
-import edu.uci.ics.asterix.aql.expression.CompactStatement;
-import edu.uci.ics.asterix.aql.expression.ConnectFeedStatement;
-import edu.uci.ics.asterix.aql.expression.CreateDataverseStatement;
-import edu.uci.ics.asterix.aql.expression.CreateFeedPolicyStatement;
-import edu.uci.ics.asterix.aql.expression.CreateFeedStatement;
-import edu.uci.ics.asterix.aql.expression.CreateFunctionStatement;
-import edu.uci.ics.asterix.aql.expression.CreateIndexStatement;
-import edu.uci.ics.asterix.aql.expression.CreatePrimaryFeedStatement;
-import edu.uci.ics.asterix.aql.expression.CreateSecondaryFeedStatement;
-import edu.uci.ics.asterix.aql.expression.DatasetDecl;
-import edu.uci.ics.asterix.aql.expression.DataverseDecl;
-import edu.uci.ics.asterix.aql.expression.DataverseDropStatement;
-import edu.uci.ics.asterix.aql.expression.DeleteStatement;
-import edu.uci.ics.asterix.aql.expression.DisconnectFeedStatement;
-import edu.uci.ics.asterix.aql.expression.DistinctClause;
-import edu.uci.ics.asterix.aql.expression.DropStatement;
-import edu.uci.ics.asterix.aql.expression.FLWOGRExpression;
-import edu.uci.ics.asterix.aql.expression.FeedDropStatement;
-import edu.uci.ics.asterix.aql.expression.FeedPolicyDropStatement;
-import edu.uci.ics.asterix.aql.expression.FieldAccessor;
-import edu.uci.ics.asterix.aql.expression.FieldBinding;
-import edu.uci.ics.asterix.aql.expression.ForClause;
-import edu.uci.ics.asterix.aql.expression.FunctionDecl;
-import edu.uci.ics.asterix.aql.expression.FunctionDropStatement;
-import edu.uci.ics.asterix.aql.expression.GbyVariableExpressionPair;
-import edu.uci.ics.asterix.aql.expression.GroupbyClause;
-import edu.uci.ics.asterix.aql.expression.Identifier;
-import edu.uci.ics.asterix.aql.expression.IfExpr;
-import edu.uci.ics.asterix.aql.expression.IndexAccessor;
-import edu.uci.ics.asterix.aql.expression.IndexDropStatement;
-import edu.uci.ics.asterix.aql.expression.InsertStatement;
-import edu.uci.ics.asterix.aql.expression.JoinClause;
-import edu.uci.ics.asterix.aql.expression.LetClause;
-import edu.uci.ics.asterix.aql.expression.LimitClause;
-import edu.uci.ics.asterix.aql.expression.ListConstructor;
-import edu.uci.ics.asterix.aql.expression.ListConstructor.Type;
-import edu.uci.ics.asterix.aql.expression.LiteralExpr;
-import edu.uci.ics.asterix.aql.expression.LoadStatement;
-import edu.uci.ics.asterix.aql.expression.MetaVariableClause;
-import edu.uci.ics.asterix.aql.expression.MetaVariableExpr;
-import edu.uci.ics.asterix.aql.expression.NodeGroupDropStatement;
-import edu.uci.ics.asterix.aql.expression.NodegroupDecl;
-import edu.uci.ics.asterix.aql.expression.OperatorExpr;
-import edu.uci.ics.asterix.aql.expression.OperatorType;
-import edu.uci.ics.asterix.aql.expression.OrderbyClause;
-import edu.uci.ics.asterix.aql.expression.OrderbyClause.OrderModifier;
-import edu.uci.ics.asterix.aql.expression.OrderedListTypeDefinition;
-import edu.uci.ics.asterix.aql.expression.QuantifiedExpression;
-import edu.uci.ics.asterix.aql.expression.QuantifiedExpression.Quantifier;
-import edu.uci.ics.asterix.aql.expression.QuantifiedPair;
-import edu.uci.ics.asterix.aql.expression.Query;
-import edu.uci.ics.asterix.aql.expression.RecordConstructor;
-import edu.uci.ics.asterix.aql.expression.RecordTypeDefinition;
-import edu.uci.ics.asterix.aql.expression.SetStatement;
-import edu.uci.ics.asterix.aql.expression.TypeDecl;
-import edu.uci.ics.asterix.aql.expression.TypeDropStatement;
-import edu.uci.ics.asterix.aql.expression.TypeReferenceExpression;
-import edu.uci.ics.asterix.aql.expression.UnaryExpr;
-import edu.uci.ics.asterix.aql.expression.UnaryExpr.Sign;
-import edu.uci.ics.asterix.aql.expression.UnionExpr;
-import edu.uci.ics.asterix.aql.expression.UnorderedListTypeDefinition;
-import edu.uci.ics.asterix.aql.expression.UpdateClause;
-import edu.uci.ics.asterix.aql.expression.UpdateStatement;
-import edu.uci.ics.asterix.aql.expression.VariableExpr;
-import edu.uci.ics.asterix.aql.expression.WhereClause;
-import edu.uci.ics.asterix.aql.expression.WriteStatement;
-import edu.uci.ics.asterix.aql.expression.visitor.IAqlPlusExpressionVisitor;
-import edu.uci.ics.asterix.aql.util.FunctionUtils;
-import edu.uci.ics.asterix.common.config.DatasetConfig.DatasetType;
-import edu.uci.ics.asterix.common.exceptions.AsterixException;
-import edu.uci.ics.asterix.common.functions.FunctionConstants;
-import edu.uci.ics.asterix.common.functions.FunctionSignature;
-import edu.uci.ics.asterix.common.transactions.JobId;
-import edu.uci.ics.asterix.formats.base.IDataFormat;
-import edu.uci.ics.asterix.metadata.declared.AqlMetadataProvider;
-import edu.uci.ics.asterix.metadata.declared.FileSplitDataSink;
-import edu.uci.ics.asterix.metadata.declared.FileSplitSinkId;
-import edu.uci.ics.asterix.metadata.entities.Dataset;
-import edu.uci.ics.asterix.metadata.utils.DatasetUtils;
-import edu.uci.ics.asterix.om.base.AString;
-import edu.uci.ics.asterix.om.constants.AsterixConstantValue;
-import edu.uci.ics.asterix.om.functions.AsterixBuiltinFunctions;
-import edu.uci.ics.asterix.om.functions.AsterixFunctionInfo;
-import edu.uci.ics.asterix.om.types.ARecordType;
-import edu.uci.ics.asterix.om.types.BuiltinType;
-import edu.uci.ics.asterix.om.types.IAType;
-import edu.uci.ics.asterix.translator.CompiledStatements.ICompiledDmlStatement;
-import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.common.exceptions.NotImplementedException;
-import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
-import edu.uci.ics.hyracks.algebricks.common.utils.Triple;
-import edu.uci.ics.hyracks.algebricks.core.algebra.base.Counter;
-import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
-import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
-import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
-import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
-import edu.uci.ics.hyracks.algebricks.core.algebra.base.OperatorAnnotations;
-import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.AbstractFunctionCallExpression;
-import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.AbstractFunctionCallExpression.FunctionKind;
-import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.AggregateFunctionCallExpression;
-import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.BroadcastExpressionAnnotation;
-import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.BroadcastExpressionAnnotation.BroadcastSide;
-import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.ConstantExpression;
-import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.ScalarFunctionCallExpression;
-import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.UnnestingFunctionCallExpression;
-import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.VariableReferenceExpression;
-import edu.uci.ics.hyracks.algebricks.core.algebra.functions.AlgebricksBuiltinFunctions;
-import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-import edu.uci.ics.hyracks.algebricks.core.algebra.functions.IFunctionInfo;
-import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractBinaryJoinOperator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AggregateOperator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AssignOperator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.DistinctOperator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.EmptyTupleSourceOperator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.GroupByOperator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.InnerJoinOperator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.LeftOuterJoinOperator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.LimitOperator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.NestedTupleSourceOperator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.OrderOperator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.OrderOperator.IOrder;
-import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ProjectOperator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SelectOperator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SubplanOperator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.UnionAllOperator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.UnnestOperator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.WriteOperator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.plan.ALogicalPlanImpl;
-import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
-
-/**
- * Each visit returns a pair of an operator and a variable. The variable
- * corresponds to the new column, if any, added to the tuple flow. E.g., for
- * Unnest, the column is the variable bound to the elements in the list, for
- * Subplan it is null. The first argument of a visit method is the expression
- * which is translated. The second argument of a visit method is the tuple
- * source for the current subtree.
- */
-
-public class AqlPlusExpressionToPlanTranslator extends AbstractAqlTranslator implements
-        IAqlPlusExpressionVisitor<Pair<ILogicalOperator, LogicalVariable>, Mutable<ILogicalOperator>> {
-
-    private static final Logger LOGGER = Logger.getLogger(AqlPlusExpressionToPlanTranslator.class.getName());
-
-    private class MetaScopeLogicalVariable {
-        private HashMap<Identifier, LogicalVariable> map = new HashMap<Identifier, LogicalVariable>();
-
-        public VariableReferenceExpression getVariableReferenceExpression(Identifier id) throws AsterixException {
-            LogicalVariable var = map.get(id);
-            LOGGER.fine("get:" + id + ":" + var);
-            if (var == null) {
-                throw new AsterixException("Identifier " + id + " not found in AQL+ meta-scope.");
-            }
-            return new VariableReferenceExpression(var);
-        }
-
-        public void put(Identifier id, LogicalVariable var) {
-            LOGGER.fine("put:" + id + ":" + var);
-            map.put(id, var);
-        }
-    }
-
-    private class MetaScopeILogicalOperator {
-        private HashMap<Identifier, ILogicalOperator> map = new HashMap<Identifier, ILogicalOperator>();
-
-        public ILogicalOperator get(Identifier id) throws AsterixException {
-            ILogicalOperator op = map.get(id);
-            if (op == null) {
-                throw new AsterixException("Identifier " + id + " not found in AQL+ meta-scope.");
-            }
-            return op;
-        }
-
-        public void put(Identifier id, ILogicalOperator op) {
-            LOGGER.fine("put:" + id + ":" + op);
-            map.put(id, op);
-        }
-    }
-
-    private final JobId jobId;
-    private TranslationContext context;
-    private String outputDatasetName;
-    private ICompiledDmlStatement stmt;
-    private AqlMetadataProvider metadataProvider;
-
-    private MetaScopeLogicalVariable metaScopeExp = new MetaScopeLogicalVariable();
-    private MetaScopeILogicalOperator metaScopeOp = new MetaScopeILogicalOperator();
-    private static LogicalVariable METADATA_DUMMY_VAR = new LogicalVariable(-1);
-
-    public AqlPlusExpressionToPlanTranslator(JobId jobId, AqlMetadataProvider metadataProvider,
-            Counter currentVarCounter, String outputDatasetName, ICompiledDmlStatement stmt) {
-        this.jobId = jobId;
-        this.metadataProvider = metadataProvider;
-        this.context = new TranslationContext(currentVarCounter);
-        this.outputDatasetName = outputDatasetName;
-        this.stmt = stmt;
-        this.context.setTopFlwor(false);
-    }
-
-    public int getVarCounter() {
-        return context.getVarCounter();
-    }
-
-    public ILogicalPlan translate(Query expr) throws AlgebricksException, AsterixException {
-        return translate(expr, null);
-    }
-
-    public ILogicalPlan translate(Query expr, AqlMetadataProvider metadata) throws AlgebricksException,
-            AsterixException {
-        IDataFormat format = metadata.getFormat();
-        if (format == null) {
-            throw new AlgebricksException("Data format has not been set.");
-        }
-        format.registerRuntimeFunctions();
-        Pair<ILogicalOperator, LogicalVariable> p = expr.accept(this, new MutableObject<ILogicalOperator>(
-                new EmptyTupleSourceOperator()));
-
-        ArrayList<Mutable<ILogicalOperator>> globalPlanRoots = new ArrayList<Mutable<ILogicalOperator>>();
-
-        boolean isTransactionalWrite = false;
-        ILogicalOperator topOp = p.first;
-        ProjectOperator project = (ProjectOperator) topOp;
-        LogicalVariable resVar = project.getVariables().get(0);
-        if (outputDatasetName == null) {
-            List<Mutable<ILogicalExpression>> writeExprList = new ArrayList<Mutable<ILogicalExpression>>(1);
-            writeExprList.add(new MutableObject<ILogicalExpression>(new VariableReferenceExpression(resVar)));
-            FileSplitSinkId fssi = new FileSplitSinkId(metadata.getOutputFile());
-            FileSplitDataSink sink = new FileSplitDataSink(fssi, null);
-            topOp = new WriteOperator(writeExprList, sink);
-            topOp.getInputs().add(new MutableObject<ILogicalOperator>(project));
-        } else {
-            Dataset dataset = metadata.findDataset(stmt.getDataverseName(), outputDatasetName);
-            if (dataset == null) {
-                throw new AlgebricksException("Cannot find dataset " + outputDatasetName);
-            }
-            if (dataset.getDatasetType() == DatasetType.EXTERNAL) {
-                throw new AlgebricksException("Cannot write output to an external dataset.");
-            }
-            ARecordType itemType = (ARecordType) metadata.findType(dataset.getDataverseName(),
-                    dataset.getItemTypeName());
-            List<List<String>> partitioningKeys = DatasetUtils.getPartitioningKeys(dataset);
-            ArrayList<LogicalVariable> vars = new ArrayList<LogicalVariable>();
-            ArrayList<Mutable<ILogicalExpression>> exprs = new ArrayList<Mutable<ILogicalExpression>>();
-            List<Mutable<ILogicalExpression>> varRefsForLoading = new ArrayList<Mutable<ILogicalExpression>>();
-            for (List<String> partitioningKey : partitioningKeys) {
-                Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType> partitioner = format
-                        .partitioningEvaluatorFactory(itemType, partitioningKey);
-                AbstractFunctionCallExpression f = partitioner.second.cloneExpression();
-                f.substituteVar(METADATA_DUMMY_VAR, resVar);
-                exprs.add(new MutableObject<ILogicalExpression>(f));
-                LogicalVariable v = context.newVar();
-                vars.add(v);
-                varRefsForLoading.add(new MutableObject<ILogicalExpression>(new VariableReferenceExpression(v)));
-            }
-            AssignOperator assign = new AssignOperator(vars, exprs);
-            assign.getInputs().add(new MutableObject<ILogicalOperator>(project));
-        }
-
-        globalPlanRoots.add(new MutableObject<ILogicalOperator>(topOp));
-        ILogicalPlan plan = new ALogicalPlanImpl(globalPlanRoots);
-        return plan;
-    }
-
-    public ILogicalPlan translate(List<Clause> clauses) throws AlgebricksException, AsterixException {
-
-        if (clauses == null) {
-            return null;
-        }
-
-        Mutable<ILogicalOperator> opRef = new MutableObject<ILogicalOperator>(new EmptyTupleSourceOperator());
-        Pair<ILogicalOperator, LogicalVariable> p = null;
-        for (Clause c : clauses) {
-            p = c.accept(this, opRef);
-            opRef = new MutableObject<ILogicalOperator>(p.first);
-        }
-
-        ArrayList<Mutable<ILogicalOperator>> globalPlanRoots = new ArrayList<Mutable<ILogicalOperator>>();
-
-        ILogicalOperator topOp = p.first;
-
-        globalPlanRoots.add(new MutableObject<ILogicalOperator>(topOp));
-        ILogicalPlan plan = new ALogicalPlanImpl(globalPlanRoots);
-        return plan;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitForClause(ForClause fc, Mutable<ILogicalOperator> tupSource)
-            throws AsterixException {
-        LogicalVariable v = context.newVar(fc.getVarExpr());
-
-        Expression inExpr = fc.getInExpr();
-        Pair<ILogicalExpression, Mutable<ILogicalOperator>> eo = aqlExprToAlgExpression(inExpr, tupSource);
-        ILogicalOperator returnedOp;
-
-        if (fc.getPosVarExpr() == null) {
-            returnedOp = new UnnestOperator(v, new MutableObject<ILogicalExpression>(makeUnnestExpression(eo.first)));
-        } else {
-            LogicalVariable pVar = context.newVar(fc.getPosVarExpr());
-            returnedOp = new UnnestOperator(v, new MutableObject<ILogicalExpression>(makeUnnestExpression(eo.first)),
-                    pVar, BuiltinType.AINT32, new AqlPositionWriter());
-        }
-        returnedOp.getInputs().add(eo.second);
-
-        return new Pair<ILogicalOperator, LogicalVariable>(returnedOp, v);
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitLetClause(LetClause lc, Mutable<ILogicalOperator> tupSource)
-            throws AsterixException {
-        LogicalVariable v;
-        ILogicalOperator returnedOp;
-
-        switch (lc.getBindingExpr().getKind()) {
-            case VARIABLE_EXPRESSION: {
-                v = context.newVar(lc.getVarExpr());
-                LogicalVariable prev = context.getVar(((VariableExpr) lc.getBindingExpr()).getVar().getId());
-                returnedOp = new AssignOperator(v, new MutableObject<ILogicalExpression>(
-                        new VariableReferenceExpression(prev)));
-                returnedOp.getInputs().add(tupSource);
-                break;
-            }
-            default: {
-                Pair<ILogicalExpression, Mutable<ILogicalOperator>> eo = aqlExprToAlgExpression(lc.getBindingExpr(),
-                        tupSource);
-                v = context.newVar(lc.getVarExpr());
-                returnedOp = new AssignOperator(v, new MutableObject<ILogicalExpression>(eo.first));
-                returnedOp.getInputs().add(eo.second);
-                break;
-            }
-        }
-        return new Pair<ILogicalOperator, LogicalVariable>(returnedOp, v);
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitFlworExpression(FLWOGRExpression flwor,
-            Mutable<ILogicalOperator> tupSource) throws AsterixException {
-        Mutable<ILogicalOperator> flworPlan = tupSource;
-        boolean isTop = context.isTopFlwor();
-        if (isTop) {
-            context.setTopFlwor(false);
-        }
-        for (Clause c : flwor.getClauseList()) {
-            Pair<ILogicalOperator, LogicalVariable> pC = c.accept(this, flworPlan);
-            flworPlan = new MutableObject<ILogicalOperator>(pC.first);
-        }
-
-        Expression r = flwor.getReturnExpr();
-        boolean noFlworClause = flwor.noForClause();
-
-        if (r.getKind() == Kind.VARIABLE_EXPRESSION) {
-            VariableExpr v = (VariableExpr) r;
-            LogicalVariable var = context.getVar(v.getVar().getId());
-
-            return produceFlwrResult(noFlworClause, isTop, flworPlan, var);
-
-        } else {
-            Mutable<ILogicalOperator> baseOp = new MutableObject<ILogicalOperator>(flworPlan.getValue());
-            Pair<ILogicalOperator, LogicalVariable> rRes = r.accept(this, baseOp);
-            ILogicalOperator rOp = rRes.first;
-            ILogicalOperator resOp;
-            if (expressionNeedsNoNesting(r)) {
-                baseOp.setValue(flworPlan.getValue());
-                resOp = rOp;
-            } else {
-                SubplanOperator s = new SubplanOperator(rOp);
-                s.getInputs().add(flworPlan);
-                resOp = s;
-                baseOp.setValue(new NestedTupleSourceOperator(new MutableObject<ILogicalOperator>(s)));
-            }
-            Mutable<ILogicalOperator> resOpRef = new MutableObject<ILogicalOperator>(resOp);
-            return produceFlwrResult(noFlworClause, isTop, resOpRef, rRes.second);
-        }
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitFieldAccessor(FieldAccessor fa,
-            Mutable<ILogicalOperator> tupSource) throws AsterixException {
-        Pair<ILogicalExpression, Mutable<ILogicalOperator>> p = aqlExprToAlgExpression(fa.getExpr(), tupSource);
-        LogicalVariable v = context.newVar();
-        AbstractFunctionCallExpression fldAccess = new ScalarFunctionCallExpression(
-                FunctionUtils.getFunctionInfo(AsterixBuiltinFunctions.FIELD_ACCESS_BY_NAME));
-        fldAccess.getArguments().add(new MutableObject<ILogicalExpression>(p.first));
-        ILogicalExpression faExpr = new ConstantExpression(new AsterixConstantValue(new AString(fa.getIdent()
-                .getValue())));
-        fldAccess.getArguments().add(new MutableObject<ILogicalExpression>(faExpr));
-        AssignOperator a = new AssignOperator(v, new MutableObject<ILogicalExpression>(fldAccess));
-        a.getInputs().add(p.second);
-        return new Pair<ILogicalOperator, LogicalVariable>(a, v);
-
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitIndexAccessor(IndexAccessor ia,
-            Mutable<ILogicalOperator> tupSource) throws AsterixException {
-        Pair<ILogicalExpression, Mutable<ILogicalOperator>> p = aqlExprToAlgExpression(ia.getExpr(), tupSource);
-        LogicalVariable v = context.newVar();
-        AbstractFunctionCallExpression f;
-        if (ia.isAny()) {
-            f = new ScalarFunctionCallExpression(
-                    FunctionUtils.getFunctionInfo(AsterixBuiltinFunctions.ANY_COLLECTION_MEMBER));
-            f.getArguments().add(new MutableObject<ILogicalExpression>(p.first));
-        } else {
-            Pair<ILogicalExpression, Mutable<ILogicalOperator>> indexPair = aqlExprToAlgExpression(ia.getIndexExpr(),
-                    tupSource);
-            f = new ScalarFunctionCallExpression(FunctionUtils.getFunctionInfo(AsterixBuiltinFunctions.GET_ITEM));
-            f.getArguments().add(new MutableObject<ILogicalExpression>(p.first));
-            f.getArguments().add(new MutableObject<ILogicalExpression>(indexPair.first));
-        }
-        AssignOperator a = new AssignOperator(v, new MutableObject<ILogicalExpression>(f));
-        a.getInputs().add(p.second);
-        return new Pair<ILogicalOperator, LogicalVariable>(a, v);
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitCallExpr(CallExpr fcall, Mutable<ILogicalOperator> tupSource)
-            throws AsterixException {
-        LogicalVariable v = context.newVar();
-        FunctionSignature signature = fcall.getFunctionSignature();
-        List<Mutable<ILogicalExpression>> args = new ArrayList<Mutable<ILogicalExpression>>();
-        Mutable<ILogicalOperator> topOp = tupSource;
-
-        for (Expression expr : fcall.getExprList()) {
-            switch (expr.getKind()) {
-                case VARIABLE_EXPRESSION: {
-                    LogicalVariable var = context.getVar(((VariableExpr) expr).getVar().getId());
-                    args.add(new MutableObject<ILogicalExpression>(new VariableReferenceExpression(var)));
-                    break;
-                }
-                case LITERAL_EXPRESSION: {
-                    LiteralExpr val = (LiteralExpr) expr;
-                    args.add(new MutableObject<ILogicalExpression>(new ConstantExpression(new AsterixConstantValue(
-                            ConstantHelper.objectFromLiteral(val.getValue())))));
-                    break;
-                }
-                default: {
-                    Pair<ILogicalExpression, Mutable<ILogicalOperator>> eo = aqlExprToAlgExpression(expr, topOp);
-                    AbstractLogicalOperator o1 = (AbstractLogicalOperator) eo.second.getValue();
-                    args.add(new MutableObject<ILogicalExpression>(eo.first));
-                    if (o1 != null && !(o1.getOperatorTag() == LogicalOperatorTag.ASSIGN && hasOnlyChild(o1, topOp))) {
-                        topOp = eo.second;
-                    }
-                    break;
-                }
-            }
-        }
-
-        FunctionIdentifier fi = new FunctionIdentifier(AlgebricksBuiltinFunctions.ALGEBRICKS_NS, signature.getName());
-        AsterixFunctionInfo afi = AsterixBuiltinFunctions.lookupFunction(fi);
-        FunctionIdentifier builtinAquafi = afi == null ? null : afi.getFunctionIdentifier();
-
-        if (builtinAquafi != null) {
-            fi = builtinAquafi;
-        } else {
-            fi = new FunctionIdentifier(FunctionConstants.ASTERIX_NS, signature.getName());
-            FunctionIdentifier builtinAsterixFi = AsterixBuiltinFunctions.getBuiltinFunctionIdentifier(fi);
-            if (builtinAsterixFi != null) {
-                fi = builtinAsterixFi;
-            }
-        }
-        AbstractFunctionCallExpression f;
-        if (AsterixBuiltinFunctions.isBuiltinAggregateFunction(fi)) {
-            f = AsterixBuiltinFunctions.makeAggregateFunctionExpression(fi, args);
-        } else if (AsterixBuiltinFunctions.isBuiltinUnnestingFunction(fi)) {
-            UnnestingFunctionCallExpression ufce = new UnnestingFunctionCallExpression(
-                    FunctionUtils.getFunctionInfo(fi), args);
-            ufce.setReturnsUniqueValues(AsterixBuiltinFunctions.returnsUniqueValues(fi));
-            f = ufce;
-        } else {
-            f = new ScalarFunctionCallExpression(FunctionUtils.getFunctionInfo(fi), args);
-        }
-        AssignOperator op = new AssignOperator(v, new MutableObject<ILogicalExpression>(f));
-        if (topOp != null) {
-            op.getInputs().add(topOp);
-        }
-
-        return new Pair<ILogicalOperator, LogicalVariable>(op, v);
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitFunctionDecl(FunctionDecl fd,
-            Mutable<ILogicalOperator> tupSource) {
-        // TODO Auto-generated method stub
-        throw new NotImplementedException();
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitGroupbyClause(GroupbyClause gc,
-            Mutable<ILogicalOperator> tupSource) throws AsterixException {
-        GroupByOperator gOp = new GroupByOperator();
-        Mutable<ILogicalOperator> topOp = tupSource;
-        for (GbyVariableExpressionPair ve : gc.getGbyPairList()) {
-            LogicalVariable v;
-            VariableExpr vexpr = ve.getVar();
-            if (vexpr != null) {
-                v = context.newVar(vexpr);
-            } else {
-                v = context.newVar();
-            }
-            Pair<ILogicalExpression, Mutable<ILogicalOperator>> eo = aqlExprToAlgExpression(ve.getExpr(), topOp);
-            gOp.addGbyExpression(v, eo.first);
-            topOp = eo.second;
-        }
-        for (GbyVariableExpressionPair ve : gc.getDecorPairList()) {
-            LogicalVariable v;
-            VariableExpr vexpr = ve.getVar();
-            if (vexpr != null) {
-                v = context.newVar(vexpr);
-            } else {
-                v = context.newVar();
-            }
-            Pair<ILogicalExpression, Mutable<ILogicalOperator>> eo = aqlExprToAlgExpression(ve.getExpr(), topOp);
-            gOp.addDecorExpression(v, eo.first);
-            topOp = eo.second;
-        }
-        gOp.getInputs().add(topOp);
-
-        for (VariableExpr var : gc.getWithVarList()) {
-            LogicalVariable aggVar = context.newVar();
-            LogicalVariable oldVar = context.getVar(var);
-            List<Mutable<ILogicalExpression>> flArgs = new ArrayList<Mutable<ILogicalExpression>>(1);
-            flArgs.add(new MutableObject<ILogicalExpression>(new VariableReferenceExpression(oldVar)));
-            AggregateFunctionCallExpression fListify = AsterixBuiltinFunctions.makeAggregateFunctionExpression(
-                    AsterixBuiltinFunctions.LISTIFY, flArgs);
-            AggregateOperator agg = new AggregateOperator(mkSingletonArrayList(aggVar),
-                    (List) mkSingletonArrayList(new MutableObject<ILogicalExpression>(fListify)));
-            agg.getInputs().add(
-                    new MutableObject<ILogicalOperator>(new NestedTupleSourceOperator(
-                            new MutableObject<ILogicalOperator>(gOp))));
-            ILogicalPlan plan = new ALogicalPlanImpl(new MutableObject<ILogicalOperator>(agg));
-            gOp.getNestedPlans().add(plan);
-            // Hide the variable that was part of the "with", replacing it with
-            // the one bound by the aggregation op.
-            context.setVar(var, aggVar);
-        }
-
-        gOp.getAnnotations().put(OperatorAnnotations.USE_HASH_GROUP_BY, gc.hasHashGroupByHint());
-        return new Pair<ILogicalOperator, LogicalVariable>(gOp, null);
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitIfExpr(IfExpr ifexpr, Mutable<ILogicalOperator> tupSource)
-            throws AsterixException {
-        // In the most general case, IfThenElse is translated in the following
-        // way.
-        //
-        // We assign the result of the condition to one variable varCond.
-        // We create one subplan which contains the plan for the "then" branch,
-        // on top of which there is a selection whose condition is varCond.
-        // Similarly, we create one subplan for the "else" branch, in which the
-        // selection is not(varCond).
-        // Finally, we concatenate the results. (??)
-
-        Pair<ILogicalOperator, LogicalVariable> pCond = ifexpr.getCondExpr().accept(this, tupSource);
-        ILogicalOperator opCond = pCond.first;
-        LogicalVariable varCond = pCond.second;
-
-        SubplanOperator sp = new SubplanOperator();
-        Mutable<ILogicalOperator> nestedSource = new MutableObject<ILogicalOperator>(new NestedTupleSourceOperator(
-                new MutableObject<ILogicalOperator>(sp)));
-
-        Pair<ILogicalOperator, LogicalVariable> pThen = ifexpr.getThenExpr().accept(this, nestedSource);
-        SelectOperator sel1 = new SelectOperator(new MutableObject<ILogicalExpression>(new VariableReferenceExpression(
-                varCond)), false, null);
-        sel1.getInputs().add(new MutableObject<ILogicalOperator>(pThen.first));
-
-        Pair<ILogicalOperator, LogicalVariable> pElse = ifexpr.getElseExpr().accept(this, nestedSource);
-        AbstractFunctionCallExpression notVarCond = new ScalarFunctionCallExpression(
-                FunctionUtils.getFunctionInfo(AlgebricksBuiltinFunctions.NOT), new MutableObject<ILogicalExpression>(
-                        new VariableReferenceExpression(varCond)));
-        SelectOperator sel2 = new SelectOperator(new MutableObject<ILogicalExpression>(notVarCond), false, null);
-        sel2.getInputs().add(new MutableObject<ILogicalOperator>(pElse.first));
-
-        ILogicalPlan p1 = new ALogicalPlanImpl(new MutableObject<ILogicalOperator>(sel1));
-        sp.getNestedPlans().add(p1);
-        ILogicalPlan p2 = new ALogicalPlanImpl(new MutableObject<ILogicalOperator>(sel2));
-        sp.getNestedPlans().add(p2);
-
-        Mutable<ILogicalOperator> opCondRef = new MutableObject<ILogicalOperator>(opCond);
-        sp.getInputs().add(opCondRef);
-
-        LogicalVariable resV = context.newVar();
-        AbstractFunctionCallExpression concatNonNull = new ScalarFunctionCallExpression(
-                FunctionUtils.getFunctionInfo(AsterixBuiltinFunctions.CONCAT_NON_NULL),
-                new MutableObject<ILogicalExpression>(new VariableReferenceExpression(pThen.second)),
-                new MutableObject<ILogicalExpression>(new VariableReferenceExpression(pElse.second)));
-        AssignOperator a = new AssignOperator(resV, new MutableObject<ILogicalExpression>(concatNonNull));
-        a.getInputs().add(new MutableObject<ILogicalOperator>(sp));
-
-        return new Pair<ILogicalOperator, LogicalVariable>(a, resV);
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitLiteralExpr(LiteralExpr l, Mutable<ILogicalOperator> tupSource) {
-        LogicalVariable var = context.newVar();
-        AssignOperator a = new AssignOperator(var, new MutableObject<ILogicalExpression>(new ConstantExpression(
-                new AsterixConstantValue(ConstantHelper.objectFromLiteral(l.getValue())))));
-        if (tupSource != null) {
-            a.getInputs().add(tupSource);
-        }
-        return new Pair<ILogicalOperator, LogicalVariable>(a, var);
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitOperatorExpr(OperatorExpr op,
-            Mutable<ILogicalOperator> tupSource) throws AsterixException {
-        ArrayList<OperatorType> ops = op.getOpList();
-        int nOps = ops.size();
-
-        if (nOps > 0 && (ops.get(0) == OperatorType.AND || ops.get(0) == OperatorType.OR)) {
-            return visitAndOrOperator(op, tupSource);
-        }
-
-        ArrayList<Expression> exprs = op.getExprList();
-
-        Mutable<ILogicalOperator> topOp = tupSource;
-
-        ILogicalExpression currExpr = null;
-        for (int i = 0; i <= nOps; i++) {
-
-            Pair<ILogicalExpression, Mutable<ILogicalOperator>> p = aqlExprToAlgExpression(exprs.get(i), topOp);
-            topOp = p.second;
-            ILogicalExpression e = p.first;
-            // now look at the operator
-            if (i < nOps) {
-                if (OperatorExpr.opIsComparison(ops.get(i))) {
-                    AbstractFunctionCallExpression c = createComparisonExpression(ops.get(i));
-
-                    // chain the operators
-                    if (i == 0) {
-                        c.getArguments().add(new MutableObject<ILogicalExpression>(e));
-                        currExpr = c;
-                        if (op.isBroadcastOperand(i)) {
-                            BroadcastExpressionAnnotation bcast = new BroadcastExpressionAnnotation();
-                            bcast.setObject(BroadcastSide.LEFT);
-                            c.getAnnotations().put(BroadcastExpressionAnnotation.BROADCAST_ANNOTATION_KEY, bcast);
-                        }
-                    } else {
-                        ((AbstractFunctionCallExpression) currExpr).getArguments().add(
-                                new MutableObject<ILogicalExpression>(e));
-                        c.getArguments().add(new MutableObject<ILogicalExpression>(currExpr));
-                        currExpr = c;
-                        if (i == 1 && op.isBroadcastOperand(i)) {
-                            BroadcastExpressionAnnotation bcast = new BroadcastExpressionAnnotation();
-                            bcast.setObject(BroadcastSide.RIGHT);
-                            c.getAnnotations().put(BroadcastExpressionAnnotation.BROADCAST_ANNOTATION_KEY, bcast);
-                        }
-                    }
-                } else {
-                    AbstractFunctionCallExpression f = createFunctionCallExpressionForBuiltinOperator(ops.get(i));
-
-                    if (i == 0) {
-                        f.getArguments().add(new MutableObject<ILogicalExpression>(e));
-                        currExpr = f;
-                    } else {
-                        ((AbstractFunctionCallExpression) currExpr).getArguments().add(
-                                new MutableObject<ILogicalExpression>(e));
-                        f.getArguments().add(new MutableObject<ILogicalExpression>(currExpr));
-                        currExpr = f;
-                    }
-                }
-            } else { // don't forget the last expression...
-                ((AbstractFunctionCallExpression) currExpr).getArguments()
-                        .add(new MutableObject<ILogicalExpression>(e));
-                if (i == 1 && op.isBroadcastOperand(i)) {
-                    BroadcastExpressionAnnotation bcast = new BroadcastExpressionAnnotation();
-                    bcast.setObject(BroadcastSide.RIGHT);
-                    ((AbstractFunctionCallExpression) currExpr).getAnnotations().put(
-                            BroadcastExpressionAnnotation.BROADCAST_ANNOTATION_KEY, bcast);
-                }
-            }
-        }
-
-        LogicalVariable assignedVar = context.newVar();
-        AssignOperator a = new AssignOperator(assignedVar, new MutableObject<ILogicalExpression>(currExpr));
-
-        a.getInputs().add(topOp);
-
-        return new Pair<ILogicalOperator, LogicalVariable>(a, assignedVar);
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitOrderbyClause(OrderbyClause oc,
-            Mutable<ILogicalOperator> tupSource) throws AsterixException {
-
-        OrderOperator ord = new OrderOperator();
-        Iterator<OrderModifier> modifIter = oc.getModifierList().iterator();
-        Mutable<ILogicalOperator> topOp = tupSource;
-        for (Expression e : oc.getOrderbyList()) {
-            Pair<ILogicalExpression, Mutable<ILogicalOperator>> p = aqlExprToAlgExpression(e, topOp);
-            OrderModifier m = modifIter.next();
-            OrderOperator.IOrder comp = (m == OrderModifier.ASC) ? OrderOperator.ASC_ORDER : OrderOperator.DESC_ORDER;
-            ord.getOrderExpressions()
-                    .add(new Pair<IOrder, Mutable<ILogicalExpression>>(comp, new MutableObject<ILogicalExpression>(
-                            p.first)));
-            topOp = p.second;
-        }
-        ord.getInputs().add(topOp);
-        if (oc.getNumTuples() > 0) {
-            ord.getAnnotations().put(OperatorAnnotations.CARDINALITY, oc.getNumTuples());
-        }
-        if (oc.getNumFrames() > 0) {
-            ord.getAnnotations().put(OperatorAnnotations.MAX_NUMBER_FRAMES, oc.getNumFrames());
-        }
-        return new Pair<ILogicalOperator, LogicalVariable>(ord, null);
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitQuantifiedExpression(QuantifiedExpression qe,
-            Mutable<ILogicalOperator> tupSource) throws AsterixException {
-        Mutable<ILogicalOperator> topOp = tupSource;
-
-        ILogicalOperator firstOp = null;
-        Mutable<ILogicalOperator> lastOp = null;
-
-        for (QuantifiedPair qt : qe.getQuantifiedList()) {
-            Pair<ILogicalExpression, Mutable<ILogicalOperator>> eo1 = aqlExprToAlgExpression(qt.getExpr(), topOp);
-            topOp = eo1.second;
-            LogicalVariable uVar = context.newVar(qt.getVarExpr());
-            ILogicalOperator u = new UnnestOperator(uVar, new MutableObject<ILogicalExpression>(
-                    makeUnnestExpression(eo1.first)));
-
-            if (firstOp == null) {
-                firstOp = u;
-            }
-            if (lastOp != null) {
-                u.getInputs().add(lastOp);
-            }
-            lastOp = new MutableObject<ILogicalOperator>(u);
-        }
-
-        // We make all the unnest correspond. to quantif. vars. sit on top
-        // in the hope of enabling joins & other optimiz.
-        firstOp.getInputs().add(topOp);
-        topOp = lastOp;
-
-        Pair<ILogicalExpression, Mutable<ILogicalOperator>> eo2 = aqlExprToAlgExpression(qe.getSatisfiesExpr(), topOp);
-
-        AggregateFunctionCallExpression fAgg;
-        SelectOperator s;
-        if (qe.getQuantifier() == Quantifier.SOME) {
-            s = new SelectOperator(new MutableObject<ILogicalExpression>(eo2.first), false, null);
-            s.getInputs().add(eo2.second);
-            fAgg = AsterixBuiltinFunctions.makeAggregateFunctionExpression(AsterixBuiltinFunctions.NON_EMPTY_STREAM,
-                    new ArrayList<Mutable<ILogicalExpression>>());
-        } else { // EVERY
-            List<Mutable<ILogicalExpression>> satExprList = new ArrayList<Mutable<ILogicalExpression>>(1);
-            satExprList.add(new MutableObject<ILogicalExpression>(eo2.first));
-            s = new SelectOperator(new MutableObject<ILogicalExpression>(new ScalarFunctionCallExpression(
-                    FunctionUtils.getFunctionInfo(AlgebricksBuiltinFunctions.NOT), satExprList)), false, null);
-            s.getInputs().add(eo2.second);
-            fAgg = AsterixBuiltinFunctions.makeAggregateFunctionExpression(AsterixBuiltinFunctions.EMPTY_STREAM,
-                    new ArrayList<Mutable<ILogicalExpression>>());
-        }
-        LogicalVariable qeVar = context.newVar();
-        AggregateOperator a = new AggregateOperator(mkSingletonArrayList(qeVar),
-                (List) mkSingletonArrayList(new MutableObject<ILogicalExpression>(fAgg)));
-        a.getInputs().add(new MutableObject<ILogicalOperator>(s));
-        return new Pair<ILogicalOperator, LogicalVariable>(a, qeVar);
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitQuery(Query q, Mutable<ILogicalOperator> tupSource)
-            throws AsterixException {
-        return q.getBody().accept(this, tupSource);
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitRecordConstructor(RecordConstructor rc,
-            Mutable<ILogicalOperator> tupSource) throws AsterixException {
-        AbstractFunctionCallExpression f = new ScalarFunctionCallExpression(
-                FunctionUtils.getFunctionInfo(AsterixBuiltinFunctions.OPEN_RECORD_CONSTRUCTOR));
-        LogicalVariable v1 = context.newVar();
-        AssignOperator a = new AssignOperator(v1, new MutableObject<ILogicalExpression>(f));
-        Mutable<ILogicalOperator> topOp = tupSource;
-        for (FieldBinding fb : rc.getFbList()) {
-            Pair<ILogicalExpression, Mutable<ILogicalOperator>> eo1 = aqlExprToAlgExpression(fb.getLeftExpr(), topOp);
-            f.getArguments().add(new MutableObject<ILogicalExpression>(eo1.first));
-            topOp = eo1.second;
-            Pair<ILogicalExpression, Mutable<ILogicalOperator>> eo2 = aqlExprToAlgExpression(fb.getRightExpr(), topOp);
-            f.getArguments().add(new MutableObject<ILogicalExpression>(eo2.first));
-            topOp = eo2.second;
-        }
-        a.getInputs().add(topOp);
-        return new Pair<ILogicalOperator, LogicalVariable>(a, v1);
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitListConstructor(ListConstructor lc,
-            Mutable<ILogicalOperator> tupSource) throws AsterixException {
-        FunctionIdentifier fid = (lc.getType() == Type.ORDERED_LIST_CONSTRUCTOR) ? AsterixBuiltinFunctions.ORDERED_LIST_CONSTRUCTOR
-                : AsterixBuiltinFunctions.UNORDERED_LIST_CONSTRUCTOR;
-        AbstractFunctionCallExpression f = new ScalarFunctionCallExpression(FunctionUtils.getFunctionInfo(fid));
-        LogicalVariable v1 = context.newVar();
-        AssignOperator a = new AssignOperator(v1, new MutableObject<ILogicalExpression>(f));
-        Mutable<ILogicalOperator> topOp = tupSource;
-        for (Expression expr : lc.getExprList()) {
-            Pair<ILogicalExpression, Mutable<ILogicalOperator>> eo = aqlExprToAlgExpression(expr, topOp);
-            f.getArguments().add(new MutableObject<ILogicalExpression>(eo.first));
-            topOp = eo.second;
-        }
-        a.getInputs().add(topOp);
-        return new Pair<ILogicalOperator, LogicalVariable>(a, v1);
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitUnaryExpr(UnaryExpr u, Mutable<ILogicalOperator> tupSource)
-            throws AsterixException {
-        Expression expr = u.getExpr();
-        Pair<ILogicalExpression, Mutable<ILogicalOperator>> eo = aqlExprToAlgExpression(expr, tupSource);
-        LogicalVariable v1 = context.newVar();
-        AssignOperator a;
-        if (u.getSign() == Sign.POSITIVE) {
-            a = new AssignOperator(v1, new MutableObject<ILogicalExpression>(eo.first));
-        } else {
-            AbstractFunctionCallExpression m = new ScalarFunctionCallExpression(
-                    FunctionUtils.getFunctionInfo(AsterixBuiltinFunctions.NUMERIC_UNARY_MINUS));
-            m.getArguments().add(new MutableObject<ILogicalExpression>(eo.first));
-            a = new AssignOperator(v1, new MutableObject<ILogicalExpression>(m));
-        }
-        a.getInputs().add(eo.second);
-        return new Pair<ILogicalOperator, LogicalVariable>(a, v1);
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitVariableExpr(VariableExpr v, Mutable<ILogicalOperator> tupSource) {
-        // Should we ever get to this method?
-        LogicalVariable var = context.newVar();
-        LogicalVariable oldV = context.getVar(v.getVar().getId());
-        AssignOperator a = new AssignOperator(var, new MutableObject<ILogicalExpression>(
-                new VariableReferenceExpression(oldV)));
-        a.getInputs().add(tupSource);
-        return new Pair<ILogicalOperator, LogicalVariable>(a, var);
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitWhereClause(WhereClause w, Mutable<ILogicalOperator> tupSource)
-            throws AsterixException {
-        Pair<ILogicalExpression, Mutable<ILogicalOperator>> p = aqlExprToAlgExpression(w.getWhereExpr(), tupSource);
-        SelectOperator s = new SelectOperator(new MutableObject<ILogicalExpression>(p.first), false, null);
-        s.getInputs().add(p.second);
-
-        return new Pair<ILogicalOperator, LogicalVariable>(s, null);
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitLimitClause(LimitClause lc, Mutable<ILogicalOperator> tupSource)
-            throws AsterixException {
-        Pair<ILogicalExpression, Mutable<ILogicalOperator>> p1 = aqlExprToAlgExpression(lc.getLimitExpr(), tupSource);
-        LimitOperator opLim;
-        Expression offset = lc.getOffset();
-        if (offset != null) {
-            Pair<ILogicalExpression, Mutable<ILogicalOperator>> p2 = aqlExprToAlgExpression(offset, p1.second);
-            opLim = new LimitOperator(p1.first, p2.first);
-            opLim.getInputs().add(p2.second);
-        } else {
-            opLim = new LimitOperator(p1.first);
-            opLim.getInputs().add(p1.second);
-        }
-        return new Pair<ILogicalOperator, LogicalVariable>(opLim, null);
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitDistinctClause(DistinctClause dc,
-            Mutable<ILogicalOperator> tupSource) throws AsterixException {
-        List<Mutable<ILogicalExpression>> exprList = new ArrayList<Mutable<ILogicalExpression>>();
-        Mutable<ILogicalOperator> input = null;
-        for (Expression expr : dc.getDistinctByExpr()) {
-            Pair<ILogicalExpression, Mutable<ILogicalOperator>> p = aqlExprToAlgExpression(expr, tupSource);
-            exprList.add(new MutableObject<ILogicalExpression>(p.first));
-            input = p.second;
-        }
-        DistinctOperator opDistinct = new DistinctOperator(exprList);
-        opDistinct.getInputs().add(input);
-        return new Pair<ILogicalOperator, LogicalVariable>(opDistinct, null);
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitUnionExpr(UnionExpr unionExpr,
-            Mutable<ILogicalOperator> tupSource) throws AsterixException {
-        Mutable<ILogicalOperator> ts = tupSource;
-        ILogicalOperator lastOp = null;
-        LogicalVariable lastVar = null;
-        boolean first = true;
-        for (Expression e : unionExpr.getExprs()) {
-            if (first) {
-                first = false;
-            } else {
-                ts = new MutableObject<ILogicalOperator>(new EmptyTupleSourceOperator());
-            }
-            Pair<ILogicalOperator, LogicalVariable> p1 = e.accept(this, ts);
-            if (lastOp == null) {
-                lastOp = p1.first;
-                lastVar = p1.second;
-            } else {
-                LogicalVariable unnestVar1 = context.newVar();
-                UnnestOperator unnest1 = new UnnestOperator(unnestVar1, new MutableObject<ILogicalExpression>(
-                        makeUnnestExpression(new VariableReferenceExpression(lastVar))));
-                unnest1.getInputs().add(new MutableObject<ILogicalOperator>(lastOp));
-                LogicalVariable unnestVar2 = context.newVar();
-                UnnestOperator unnest2 = new UnnestOperator(unnestVar2, new MutableObject<ILogicalExpression>(
-                        makeUnnestExpression(new VariableReferenceExpression(p1.second))));
-                unnest2.getInputs().add(new MutableObject<ILogicalOperator>(p1.first));
-                List<Triple<LogicalVariable, LogicalVariable, LogicalVariable>> varMap = new ArrayList<Triple<LogicalVariable, LogicalVariable, LogicalVariable>>(
-                        1);
-                LogicalVariable resultVar = context.newVar();
-                Triple<LogicalVariable, LogicalVariable, LogicalVariable> triple = new Triple<LogicalVariable, LogicalVariable, LogicalVariable>(
-                        unnestVar1, unnestVar2, resultVar);
-                varMap.add(triple);
-                UnionAllOperator unionOp = new UnionAllOperator(varMap);
-                unionOp.getInputs().add(new MutableObject<ILogicalOperator>(unnest1));
-                unionOp.getInputs().add(new MutableObject<ILogicalOperator>(unnest2));
-                lastVar = resultVar;
-                lastOp = unionOp;
-            }
-        }
-        LogicalVariable aggVar = context.newVar();
-        ArrayList<LogicalVariable> aggregVars = new ArrayList<LogicalVariable>(1);
-        aggregVars.add(aggVar);
-        List<Mutable<ILogicalExpression>> afcExprs = new ArrayList<Mutable<ILogicalExpression>>(1);
-        afcExprs.add(new MutableObject<ILogicalExpression>(new VariableReferenceExpression(lastVar)));
-        AggregateFunctionCallExpression afc = AsterixBuiltinFunctions.makeAggregateFunctionExpression(
-                AsterixBuiltinFunctions.LISTIFY, afcExprs);
-        ArrayList<Mutable<ILogicalExpression>> aggregExprs = new ArrayList<Mutable<ILogicalExpression>>(1);
-        aggregExprs.add(new MutableObject<ILogicalExpression>(afc));
-        AggregateOperator agg = new AggregateOperator(aggregVars, aggregExprs);
-        agg.getInputs().add(new MutableObject<ILogicalOperator>(lastOp));
-        return new Pair<ILogicalOperator, LogicalVariable>(agg, aggVar);
-    }
-
-    private AbstractFunctionCallExpression createComparisonExpression(OperatorType t) {
-        FunctionIdentifier fi = operatorTypeToFunctionIdentifier(t);
-        IFunctionInfo finfo = FunctionUtils.getFunctionInfo(fi);
-        return new ScalarFunctionCallExpression(finfo);
-    }
-
-    private FunctionIdentifier operatorTypeToFunctionIdentifier(OperatorType t) {
-        switch (t) {
-            case EQ: {
-                return AlgebricksBuiltinFunctions.EQ;
-            }
-            case NEQ: {
-                return AlgebricksBuiltinFunctions.NEQ;
-            }
-            case GT: {
-                return AlgebricksBuiltinFunctions.GT;
-            }
-            case GE: {
-                return AlgebricksBuiltinFunctions.GE;
-            }
-            case LT: {
-                return AlgebricksBuiltinFunctions.LT;
-            }
-            case LE: {
-                return AlgebricksBuiltinFunctions.LE;
-            }
-            default: {
-                throw new IllegalStateException();
-            }
-        }
-    }
-
-    private AbstractFunctionCallExpression createFunctionCallExpressionForBuiltinOperator(OperatorType t)
-            throws AsterixException {
-
-        FunctionIdentifier fid = null;
-        switch (t) {
-            case PLUS: {
-                fid = AlgebricksBuiltinFunctions.NUMERIC_ADD;
-                break;
-            }
-            case MINUS: {
-                fid = AsterixBuiltinFunctions.NUMERIC_SUBTRACT;
-                break;
-            }
-            case MUL: {
-                fid = AsterixBuiltinFunctions.NUMERIC_MULTIPLY;
-                break;
-            }
-            case DIV: {
-                fid = AsterixBuiltinFunctions.NUMERIC_DIVIDE;
-                break;
-            }
-            case MOD: {
-                fid = AsterixBuiltinFunctions.NUMERIC_MOD;
-                break;
-            }
-            case IDIV: {
-                fid = AsterixBuiltinFunctions.NUMERIC_IDIV;
-                break;
-            }
-            case CARET: {
-                fid = AsterixBuiltinFunctions.CARET;
-                break;
-            }
-            case AND: {
-                fid = AlgebricksBuiltinFunctions.AND;
-                break;
-            }
-            case OR: {
-                fid = AlgebricksBuiltinFunctions.OR;
-                break;
-            }
-            case FUZZY_EQ: {
-                fid = AsterixBuiltinFunctions.FUZZY_EQ;
-                break;
-            }
-
-            default: {
-                throw new NotImplementedException("Operator " + t + " is not yet implemented");
-            }
-        }
-        return new ScalarFunctionCallExpression(FunctionUtils.getFunctionInfo(fid));
-    }
-
-    private static boolean hasOnlyChild(ILogicalOperator parent, Mutable<ILogicalOperator> childCandidate) {
-        List<Mutable<ILogicalOperator>> inp = parent.getInputs();
-        if (inp == null || inp.size() != 1) {
-            return false;
-        }
-        return inp.get(0) == childCandidate;
-    }
-
-    private Pair<ILogicalExpression, Mutable<ILogicalOperator>> aqlExprToAlgExpression(Expression expr,
-            Mutable<ILogicalOperator> topOp) throws AsterixException {
-        switch (expr.getKind()) {
-            case VARIABLE_EXPRESSION: {
-                VariableReferenceExpression ve = new VariableReferenceExpression(context.getVar(((VariableExpr) expr)
-                        .getVar().getId()));
-                return new Pair<ILogicalExpression, Mutable<ILogicalOperator>>(ve, topOp);
-            }
-            case METAVARIABLE_EXPRESSION: {
-                ILogicalExpression le = metaScopeExp.getVariableReferenceExpression(((VariableExpr) expr).getVar());
-                return new Pair<ILogicalExpression, Mutable<ILogicalOperator>>(le, topOp);
-            }
-            case LITERAL_EXPRESSION: {
-                LiteralExpr val = (LiteralExpr) expr;
-                return new Pair<ILogicalExpression, Mutable<ILogicalOperator>>(new ConstantExpression(
-                        new AsterixConstantValue(ConstantHelper.objectFromLiteral(val.getValue()))), topOp);
-            }
-            default: {
-                // Mutable<ILogicalExpression> src = new
-                // Mutable<ILogicalExpression>();
-                // Mutable<ILogicalExpression> src = topOp;
-                if (expressionNeedsNoNesting(expr)) {
-                    Pair<ILogicalOperator, LogicalVariable> p = expr.accept(this, topOp);
-                    ILogicalExpression exp = ((AssignOperator) p.first).getExpressions().get(0).getValue();
-                    return new Pair<ILogicalExpression, Mutable<ILogicalOperator>>(exp, p.first.getInputs().get(0));
-                } else {
-                    Mutable<ILogicalOperator> src = new MutableObject<ILogicalOperator>();
-
-                    Pair<ILogicalOperator, LogicalVariable> p = expr.accept(this, src);
-
-                    if (((AbstractLogicalOperator) p.first).getOperatorTag() == LogicalOperatorTag.SUBPLAN) {
-                        // src.setOperator(topOp.getOperator());
-                        Mutable<ILogicalOperator> top2 = new MutableObject<ILogicalOperator>(p.first);
-                        return new Pair<ILogicalExpression, Mutable<ILogicalOperator>>(new VariableReferenceExpression(
-                                p.second), top2);
-                    } else {
-                        SubplanOperator s = new SubplanOperator();
-                        s.getInputs().add(topOp);
-                        src.setValue(new NestedTupleSourceOperator(new MutableObject<ILogicalOperator>(s)));
-                        Mutable<ILogicalOperator> planRoot = new MutableObject<ILogicalOperator>(p.first);
-                        s.setRootOp(planRoot);
-                        return new Pair<ILogicalExpression, Mutable<ILogicalOperator>>(new VariableReferenceExpression(
-                                p.second), new MutableObject<ILogicalOperator>(s));
-                    }
-                }
-            }
-        }
-
-    }
-
-    private Pair<ILogicalOperator, LogicalVariable> produceFlwrResult(boolean noForClause, boolean isTop,
-            Mutable<ILogicalOperator> resOpRef, LogicalVariable resVar) {
-        if (isTop) {
-            ProjectOperator pr = new ProjectOperator(resVar);
-            pr.getInputs().add(resOpRef);
-            return new Pair<ILogicalOperator, LogicalVariable>(pr, resVar);
-
-        } else if (noForClause) {
-            return new Pair<ILogicalOperator, LogicalVariable>(resOpRef.getValue(), resVar);
-        } else {
-            return aggListify(resVar, resOpRef, false);
-        }
-    }
-
-    private Pair<ILogicalOperator, LogicalVariable> aggListify(LogicalVariable var, Mutable<ILogicalOperator> opRef,
-            boolean bProject) {
-        AggregateFunctionCallExpression funAgg = AsterixBuiltinFunctions.makeAggregateFunctionExpression(
-                AsterixBuiltinFunctions.LISTIFY, new ArrayList<Mutable<ILogicalExpression>>());
-        funAgg.getArguments().add(new MutableObject<ILogicalExpression>(new VariableReferenceExpression(var)));
-        LogicalVariable varListified = context.newVar();
-        AggregateOperator agg = new AggregateOperator(mkSingletonArrayList(varListified),
-                (List) mkSingletonArrayList(new MutableObject<ILogicalExpression>(funAgg)));
-        agg.getInputs().add(opRef);
-        ILogicalOperator res;
-        if (bProject) {
-            ProjectOperator pr = new ProjectOperator(varListified);
-            pr.getInputs().add(new MutableObject<ILogicalOperator>(agg));
-            res = pr;
-        } else {
-            res = agg;
-        }
-        return new Pair<ILogicalOperator, LogicalVariable>(res, varListified);
-    }
-
-    private Pair<ILogicalOperator, LogicalVariable> visitAndOrOperator(OperatorExpr op,
-            Mutable<ILogicalOperator> tupSource) throws AsterixException {
-        ArrayList<OperatorType> ops = op.getOpList();
-        int nOps = ops.size();
-
-        ArrayList<Expression> exprs = op.getExprList();
-
-        Mutable<ILogicalOperator> topOp = tupSource;
-
-        OperatorType opLogical = ops.get(0);
-        AbstractFunctionCallExpression f = createFunctionCallExpressionForBuiltinOperator(opLogical);
-
-        for (int i = 0; i <= nOps; i++) {
-            Pair<ILogicalExpression, Mutable<ILogicalOperator>> p = aqlExprToAlgExpression(exprs.get(i), topOp);
-            topOp = p.second;
-            // now look at the operator
-            if (i < nOps) {
-                if (ops.get(i) != opLogical) {
-                    throw new TranslationException("Unexpected operator " + ops.get(i)
-                            + " in an OperatorExpr starting with " + opLogical);
-                }
-            }
-            f.getArguments().add(new MutableObject<ILogicalExpression>(p.first));
-        }
-
-        LogicalVariable assignedVar = context.newVar();
-        AssignOperator a = new AssignOperator(assignedVar, new MutableObject<ILogicalExpression>(f));
-        a.getInputs().add(topOp);
-
-        return new Pair<ILogicalOperator, LogicalVariable>(a, assignedVar);
-
-    }
-
-    private static boolean expressionNeedsNoNesting(Expression expr) {
-        Kind k = expr.getKind();
-        return k == Kind.LITERAL_EXPRESSION || k == Kind.LIST_CONSTRUCTOR_EXPRESSION
-                || k == Kind.RECORD_CONSTRUCTOR_EXPRESSION || k == Kind.VARIABLE_EXPRESSION
-                || k == Kind.CALL_EXPRESSION || k == Kind.OP_EXPRESSION || k == Kind.FIELD_ACCESSOR_EXPRESSION
-                || k == Kind.INDEX_ACCESSOR_EXPRESSION || k == Kind.UNARY_EXPRESSION;
-    }
-
-    private <T> ArrayList<T> mkSingletonArrayList(T item) {
-        ArrayList<T> array = new ArrayList<T>(1);
-        array.add(item);
-        return array;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitTypeDecl(TypeDecl td, Mutable<ILogicalOperator> arg)
-            throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitRecordTypeDefiniton(RecordTypeDefinition tre,
-            Mutable<ILogicalOperator> arg) throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitTypeReferenceExpression(TypeReferenceExpression tre,
-            Mutable<ILogicalOperator> arg) throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitNodegroupDecl(NodegroupDecl ngd, Mutable<ILogicalOperator> arg)
-            throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitLoadStatement(LoadStatement stmtLoad,
-            Mutable<ILogicalOperator> arg) throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitDropStatement(DropStatement del, Mutable<ILogicalOperator> arg)
-            throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitCreateIndexStatement(CreateIndexStatement cis,
-            Mutable<ILogicalOperator> arg) throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitOrderedListTypeDefiniton(OrderedListTypeDefinition olte,
-            Mutable<ILogicalOperator> arg) throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitUnorderedListTypeDefiniton(UnorderedListTypeDefinition ulte,
-            Mutable<ILogicalOperator> arg) throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitMetaVariableClause(MetaVariableClause mc,
-            Mutable<ILogicalOperator> tupSource) throws AsterixException {
-        return new Pair<ILogicalOperator, LogicalVariable>(metaScopeOp.get(mc.getVar()), null);
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitJoinClause(JoinClause jc, Mutable<ILogicalOperator> tupSource)
-            throws AsterixException {
-        // Pair<ILogicalOperator, LogicalVariable> leftSide =
-        // jc.getLeftExpr().accept(this, tupSource);
-        Mutable<ILogicalOperator> opRef = tupSource;
-        Pair<ILogicalOperator, LogicalVariable> leftSide = null;
-        for (Clause c : jc.getLeftClauses()) {
-            leftSide = c.accept(this, opRef);
-            opRef = new MutableObject<ILogicalOperator>(leftSide.first);
-        }
-
-        // Pair<ILogicalOperator, LogicalVariable> rightSide =
-        // jc.getRightExpr().accept(this, tupSource);
-        opRef = tupSource;
-        Pair<ILogicalOperator, LogicalVariable> rightSide = null;
-        for (Clause c : jc.getRightClauses()) {
-            rightSide = c.accept(this, opRef);
-            opRef = new MutableObject<ILogicalOperator>(rightSide.first);
-        }
-
-        Pair<ILogicalExpression, Mutable<ILogicalOperator>> whereCond = aqlExprToAlgExpression(jc.getWhereExpr(),
-                tupSource);
-
-        AbstractBinaryJoinOperator join;
-        switch (jc.getKind()) {
-            case INNER: {
-                join = new InnerJoinOperator(new MutableObject<ILogicalExpression>(whereCond.first));
-                break;
-            }
-            case LEFT_OUTER: {
-                join = new LeftOuterJoinOperator(new MutableObject<ILogicalExpression>(whereCond.first));
-                break;
-            }
-            default: {
-                throw new IllegalStateException();
-            }
-        }
-        join.getInputs().add(new MutableObject<ILogicalOperator>(leftSide.first));
-        join.getInputs().add(new MutableObject<ILogicalOperator>(rightSide.first));
-        return new Pair<ILogicalOperator, LogicalVariable>(join, null);
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitMetaVariableExpr(MetaVariableExpr me,
-            Mutable<ILogicalOperator> tupSource) throws AsterixException {
-        LogicalVariable var = context.newVar();
-        AssignOperator a = new AssignOperator(var, new MutableObject<ILogicalExpression>(
-                metaScopeExp.getVariableReferenceExpression(me.getVar())));
-        a.getInputs().add(tupSource);
-        return new Pair<ILogicalOperator, LogicalVariable>(a, var);
-    }
-
-    public void addOperatorToMetaScope(Identifier id, ILogicalOperator op) {
-        metaScopeOp.put(id, op);
-    }
-
-    public void addVariableToMetaScope(Identifier id, LogicalVariable var) {
-        metaScopeExp.put(id, var);
-    }
-
-    private ILogicalExpression makeUnnestExpression(ILogicalExpression expr) {
-        switch (expr.getExpressionTag()) {
-            case VARIABLE: {
-                return new UnnestingFunctionCallExpression(
-                        FunctionUtils.getFunctionInfo(AsterixBuiltinFunctions.SCAN_COLLECTION),
-                        new MutableObject<ILogicalExpression>(expr));
-            }
-            case FUNCTION_CALL: {
-                AbstractFunctionCallExpression fce = (AbstractFunctionCallExpression) expr;
-                if (fce.getKind() == FunctionKind.UNNEST) {
-                    return expr;
-                } else {
-                    return new UnnestingFunctionCallExpression(
-                            FunctionUtils.getFunctionInfo(AsterixBuiltinFunctions.SCAN_COLLECTION),
-                            new MutableObject<ILogicalExpression>(expr));
-                }
-            }
-            default: {
-                return expr;
-            }
-        }
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitInsertStatement(InsertStatement insert,
-            Mutable<ILogicalOperator> arg) throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitDeleteStatement(DeleteStatement del,
-            Mutable<ILogicalOperator> arg) throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitUpdateStatement(UpdateStatement update,
-            Mutable<ILogicalOperator> arg) throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitUpdateClause(UpdateClause del, Mutable<ILogicalOperator> arg)
-            throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitDataverseDecl(DataverseDecl dv, Mutable<ILogicalOperator> arg)
-            throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitDatasetDecl(DatasetDecl dd, Mutable<ILogicalOperator> arg)
-            throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitSetStatement(SetStatement ss, Mutable<ILogicalOperator> arg)
-            throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitWriteStatement(WriteStatement ws, Mutable<ILogicalOperator> arg)
-            throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitCreateDataverseStatement(CreateDataverseStatement del,
-            Mutable<ILogicalOperator> arg) throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitIndexDropStatement(IndexDropStatement del,
-            Mutable<ILogicalOperator> arg) throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitNodeGroupDropStatement(NodeGroupDropStatement del,
-            Mutable<ILogicalOperator> arg) throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitDataverseDropStatement(DataverseDropStatement del,
-            Mutable<ILogicalOperator> arg) throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitTypeDropStatement(TypeDropStatement del,
-            Mutable<ILogicalOperator> arg) throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitDisconnectFeedStatement(DisconnectFeedStatement del,
-            Mutable<ILogicalOperator> arg) throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visit(CreateFunctionStatement cfs, Mutable<ILogicalOperator> arg)
-            throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitFunctionDropStatement(FunctionDropStatement del,
-            Mutable<ILogicalOperator> arg) throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitConnectFeedStatement(ConnectFeedStatement del,
-            Mutable<ILogicalOperator> arg) throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitDropFeedStatement(FeedDropStatement del,
-            Mutable<ILogicalOperator> arg) throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitCompactStatement(CompactStatement del,
-            Mutable<ILogicalOperator> arg) throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-    
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitCreatePrimaryFeedStatement(CreatePrimaryFeedStatement del,
-            Mutable<ILogicalOperator> arg) throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitCreateSecondaryFeedStatement(CreateSecondaryFeedStatement del,
-            Mutable<ILogicalOperator> arg) throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitCreateFeedPolicyStatement(CreateFeedPolicyStatement cfps,
-            Mutable<ILogicalOperator> arg) throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Pair<ILogicalOperator, LogicalVariable> visitDropFeedPolicyStatement(FeedPolicyDropStatement dfs,
-            Mutable<ILogicalOperator> arg) throws AsterixException {
-        // TODO Auto-generated method stub
-        return null;
-    }
-}

http://git-wip-us.apache.org/repos/asf/incubator-asterixdb/blob/34d81630/asterix-algebra/src/main/java/edu/uci/ics/asterix/translator/AqlPositionWriter.java
----------------------------------------------------------------------
diff --git a/asterix-algebra/src/main/java/edu/uci/ics/asterix/translator/AqlPositionWriter.java b/asterix-algebra/src/main/java/edu/uci/ics/asterix/translator/AqlPositionWriter.java
deleted file mode 100644
index da66fe4..0000000
--- a/asterix-algebra/src/main/java/edu/uci/ics/asterix/translator/AqlPositionWriter.java
+++ /dev/null
@@ -1,33 +0,0 @@
-/*
- * Copyright 2009-2013 by The Regents of the University of California
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * you may obtain a copy of the License from
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package edu.uci.ics.asterix.translator;
-
-import java.io.DataOutput;
-import java.io.IOException;
-import java.io.Serializable;
-
-import edu.uci.ics.asterix.om.types.BuiltinType;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IUnnestingPositionWriter;
-
-public class AqlPositionWriter implements IUnnestingPositionWriter, Serializable {
-    private static final long serialVersionUID = 1L;
-
-    @Override
-    public void write(DataOutput dataOutput, long position) throws IOException {
-        dataOutput.writeByte(BuiltinType.AINT64.getTypeTag().serialize());
-        dataOutput.writeLong(position);
-    }
-
-}


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