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Posted to commits@asterixdb.apache.org by im...@apache.org on 2015/08/25 18:44:10 UTC

[22/51] [partial] incubator-asterixdb git commit: Change folder structure for Java repackage

http://git-wip-us.apache.org/repos/asf/incubator-asterixdb/blob/34d81630/asterix-algebra/src/main/java/org/apache/asterix/translator/AqlPlusExpressionToPlanTranslator.java
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diff --git a/asterix-algebra/src/main/java/org/apache/asterix/translator/AqlPlusExpressionToPlanTranslator.java b/asterix-algebra/src/main/java/org/apache/asterix/translator/AqlPlusExpressionToPlanTranslator.java
new file mode 100644
index 0000000..7bfa056
--- /dev/null
+++ b/asterix-algebra/src/main/java/org/apache/asterix/translator/AqlPlusExpressionToPlanTranslator.java
@@ -0,0 +1,1498 @@
+/*
+ * 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/org/apache/asterix/translator/AqlPositionWriter.java
----------------------------------------------------------------------
diff --git a/asterix-algebra/src/main/java/org/apache/asterix/translator/AqlPositionWriter.java b/asterix-algebra/src/main/java/org/apache/asterix/translator/AqlPositionWriter.java
new file mode 100644
index 0000000..da66fe4
--- /dev/null
+++ b/asterix-algebra/src/main/java/org/apache/asterix/translator/AqlPositionWriter.java
@@ -0,0 +1,33 @@
+/*
+ * 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);
+    }
+
+}