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From hj...@apache.org
Subject [25/35] TAJO-1125: Separate logical plan and optimizer into a maven module.
Date Sun, 26 Oct 2014 19:27:31 GMT
http://git-wip-us.apache.org/repos/asf/tajo/blob/b143f991/tajo-core/src/main/java/org/apache/tajo/engine/planner/LogicalPlanner.java
----------------------------------------------------------------------
diff --git a/tajo-core/src/main/java/org/apache/tajo/engine/planner/LogicalPlanner.java b/tajo-core/src/main/java/org/apache/tajo/engine/planner/LogicalPlanner.java
deleted file mode 100644
index 89382f4..0000000
--- a/tajo-core/src/main/java/org/apache/tajo/engine/planner/LogicalPlanner.java
+++ /dev/null
@@ -1,2002 +0,0 @@
-/**
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you 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 at
- *
- *     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 org.apache.tajo.engine.planner;
-
-import com.google.common.annotations.VisibleForTesting;
-import com.google.common.base.Joiner;
-import com.google.common.collect.Lists;
-import com.google.common.collect.Sets;
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
-import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.fs.ContentSummary;
-import org.apache.hadoop.fs.FileStatus;
-import org.apache.hadoop.fs.FileSystem;
-import org.apache.hadoop.fs.Path;
-import org.apache.tajo.algebra.*;
-import org.apache.tajo.algebra.WindowSpec;
-import org.apache.tajo.catalog.*;
-import org.apache.tajo.catalog.partition.PartitionMethodDesc;
-import org.apache.tajo.catalog.proto.CatalogProtos;
-import org.apache.tajo.common.TajoDataTypes;
-import org.apache.tajo.datum.NullDatum;
-import org.apache.tajo.engine.eval.*;
-import org.apache.tajo.engine.exception.VerifyException;
-import org.apache.tajo.engine.optimizer.eval.EvalTreeOptimizer;
-import org.apache.tajo.engine.planner.LogicalPlan.QueryBlock;
-import org.apache.tajo.engine.planner.logical.*;
-import org.apache.tajo.engine.planner.nameresolver.NameResolvingMode;
-import org.apache.tajo.engine.planner.rewrite.ProjectionPushDownRule;
-import org.apache.tajo.engine.query.QueryContext;
-import org.apache.tajo.engine.utils.SchemaUtil;
-import org.apache.tajo.storage.StorageUtil;
-import org.apache.tajo.util.KeyValueSet;
-import org.apache.tajo.util.Pair;
-import org.apache.tajo.util.TUtil;
-
-import java.util.*;
-
-import static org.apache.tajo.algebra.CreateTable.PartitionType;
-import static org.apache.tajo.engine.planner.ExprNormalizer.ExprNormalizedResult;
-import static org.apache.tajo.engine.planner.LogicalPlan.BlockType;
-
-/**
- * This class creates a logical plan from a nested tajo algebra expression ({@link org.apache.tajo.algebra})
- */
-public class LogicalPlanner extends BaseAlgebraVisitor<LogicalPlanner.PlanContext, LogicalNode> {
-  private static Log LOG = LogFactory.getLog(LogicalPlanner.class);
-  private final CatalogService catalog;
-  private final LogicalPlanPreprocessor preprocessor;
-  private final EvalTreeOptimizer evalOptimizer;
-  private final ExprAnnotator exprAnnotator;
-  private final ExprNormalizer normalizer;
-
-  public LogicalPlanner(CatalogService catalog) {
-    this.catalog = catalog;
-    this.exprAnnotator = new ExprAnnotator(catalog);
-    this.preprocessor = new LogicalPlanPreprocessor(catalog, exprAnnotator);
-    this.normalizer = new ExprNormalizer();
-    this.evalOptimizer = new EvalTreeOptimizer();
-  }
-
-  public static class PlanContext {
-    QueryContext queryContext;
-    LogicalPlan plan;
-    QueryBlock queryBlock;
-    EvalTreeOptimizer evalOptimizer;
-    boolean debugOrUnitTests;
-
-    public PlanContext(QueryContext context, LogicalPlan plan, QueryBlock block, EvalTreeOptimizer evalOptimizer,
-                       boolean debugOrUnitTests) {
-      this.queryContext = context;
-      this.plan = plan;
-      this.queryBlock = block;
-      this.evalOptimizer = evalOptimizer;
-      this.debugOrUnitTests = debugOrUnitTests;
-    }
-
-    public PlanContext(PlanContext context, QueryBlock block) {
-      this.queryContext = context.queryContext;
-      this.plan = context.plan;
-      this.queryBlock = block;
-      this.evalOptimizer = context.evalOptimizer;
-      this.debugOrUnitTests = context.debugOrUnitTests;
-    }
-
-    public QueryBlock getQueryBlock() {
-      return queryBlock;
-    }
-
-    public String toString() {
-      return "block=" + queryBlock.getName() + ", relNum=" + queryBlock.getRelations().size() + ", "+
-          queryBlock.namedExprsMgr.toString();
-    }
-  }
-
-  /**
-   * This generates a logical plan.
-   *
-   * @param expr A relational algebraic expression for a query.
-   * @return A logical plan
-   */
-  public LogicalPlan createPlan(QueryContext context, Expr expr) throws PlanningException {
-    return createPlan(context, expr, false);
-  }
-
-  @VisibleForTesting
-  public LogicalPlan createPlan(QueryContext queryContext, Expr expr, boolean debug) throws PlanningException {
-
-    LogicalPlan plan = new LogicalPlan(this);
-
-    QueryBlock rootBlock = plan.newAndGetBlock(LogicalPlan.ROOT_BLOCK);
-    PlanContext context = new PlanContext(queryContext, plan, rootBlock, evalOptimizer, debug);
-    preprocessor.visit(context, new Stack<Expr>(), expr);
-    plan.resetGeneratedId();
-    LogicalNode topMostNode = this.visit(context, new Stack<Expr>(), expr);
-
-    // Add Root Node
-    LogicalRootNode root = plan.createNode(LogicalRootNode.class);
-    root.setInSchema(topMostNode.getOutSchema());
-    root.setChild(topMostNode);
-    root.setOutSchema(topMostNode.getOutSchema());
-    plan.getRootBlock().setRoot(root);
-
-    return plan;
-  }
-
-  public ExprAnnotator getExprAnnotator() {
-    return this.exprAnnotator;
-  }
-
-  public void preHook(PlanContext context, Stack<Expr> stack, Expr expr) throws PlanningException {
-    context.queryBlock.updateCurrentNode(expr);
-  }
-
-  public LogicalNode postHook(PlanContext context, Stack<Expr> stack, Expr expr, LogicalNode current)
-      throws PlanningException {
-
-
-    // Some generated logical nodes (e.g., implicit aggregation) without exprs will pass NULL as a expr parameter.
-    // We should skip them.
-    if (expr != null) {
-      // A relation list including a single ScanNode will return a ScanNode instance that already passed postHook.
-      // So, it skips the already-visited ScanNode instance.
-      if (expr.getType() == OpType.RelationList && current.getType() == NodeType.SCAN) {
-        return current;
-      }
-    }
-
-    QueryBlock queryBlock = context.queryBlock;
-    queryBlock.updateLatestNode(current);
-
-    // if this node is the topmost
-    if (stack.size() == 0) {
-      queryBlock.setRoot(current);
-    }
-
-    if (!stack.empty()) {
-      queryBlock.updateCurrentNode(stack.peek());
-    }
-    return current;
-  }
-
-  public LogicalNode visitExplain(PlanContext ctx, Stack<Expr> stack, Explain expr) throws PlanningException {
-    ctx.plan.setExplain();
-    return visit(ctx, stack, expr.getChild());
-  }
-
-  /*===============================================================================================
-    Data Manupulation Language (DML) SECTION
-   ===============================================================================================*/
-
-
-  /*===============================================================================================
-    PROJECTION SECTION
-   ===============================================================================================*/
-  @Override
-  public LogicalNode visitProjection(PlanContext context, Stack<Expr> stack, Projection projection)
-      throws PlanningException {
-
-
-    LogicalPlan plan = context.plan;
-    QueryBlock block = context.queryBlock;
-
-    // If a non-from statement is given
-    if (!projection.hasChild()) {
-      return buildPlanForNoneFromStatement(context, stack, projection);
-    }
-
-    String [] referenceNames;
-    // in prephase, insert all target list into NamedExprManagers.
-    // Then it gets reference names, each of which points an expression in target list.
-    Pair<String [], ExprNormalizer.WindowSpecReferences []> referencesPair = doProjectionPrephase(context, projection);
-    referenceNames = referencesPair.getFirst();
-
-    ////////////////////////////////////////////////////////
-    // Visit and Build Child Plan
-    ////////////////////////////////////////////////////////
-    stack.push(projection);
-    LogicalNode child = visit(context, stack, projection.getChild());
-
-    // check if it is implicit aggregation. If so, it inserts group-by node to its child.
-    if (block.isAggregationRequired()) {
-      child = insertGroupbyNode(context, child, stack);
-    }
-
-    if (block.hasWindowSpecs()) {
-      LogicalNode windowAggNode =
-          insertWindowAggNode(context, child, stack, referenceNames, referencesPair.getSecond());
-      if (windowAggNode != null) {
-        child = windowAggNode;
-      }
-    }
-    stack.pop();
-    ////////////////////////////////////////////////////////
-
-    ProjectionNode projectionNode;
-    Target [] targets;
-    targets = buildTargets(context, referenceNames);
-
-    // Set ProjectionNode
-    projectionNode = context.queryBlock.getNodeFromExpr(projection);
-    projectionNode.setInSchema(child.getOutSchema());
-    projectionNode.setTargets(targets);
-    projectionNode.setChild(child);
-
-    if (projection.isDistinct() && block.hasNode(NodeType.GROUP_BY)) {
-      throw new VerifyException("Cannot support grouping and distinct at the same time yet");
-    } else {
-      if (projection.isDistinct()) {
-        insertDistinctOperator(context, projectionNode, child, stack);
-      }
-    }
-
-    // It's for debugging and unit tests purpose.
-    // It sets raw targets, all of them are raw expressions instead of references.
-    if (context.debugOrUnitTests) {
-      setRawTargets(context, targets, referenceNames, projection);
-    }
-
-    verifyProjectedFields(block, projectionNode);
-    return projectionNode;
-  }
-
-  private void setRawTargets(PlanContext context, Target[] targets, String[] referenceNames,
-                             Projection projection) throws PlanningException {
-    LogicalPlan plan = context.plan;
-    QueryBlock block = context.queryBlock;
-
-    // It's for debugging or unit tests.
-    Target [] rawTargets = new Target[projection.getNamedExprs().length];
-    for (int i = 0; i < projection.getNamedExprs().length; i++) {
-      NamedExpr namedExpr = projection.getNamedExprs()[i];
-      EvalNode evalNode = exprAnnotator.createEvalNode(context, namedExpr.getExpr(),
-          NameResolvingMode.RELS_AND_SUBEXPRS);
-      rawTargets[i] = new Target(evalNode, referenceNames[i]);
-    }
-    // it's for debugging or unit testing
-    block.setRawTargets(rawTargets);
-  }
-
-  private void insertDistinctOperator(PlanContext context, ProjectionNode projectionNode, LogicalNode child,
-                                      Stack<Expr> stack) throws PlanningException {
-    LogicalPlan plan = context.plan;
-    QueryBlock block = context.queryBlock;
-
-    Schema outSchema = projectionNode.getOutSchema();
-    GroupbyNode dupRemoval = context.plan.createNode(GroupbyNode.class);
-    dupRemoval.setChild(child);
-    dupRemoval.setInSchema(projectionNode.getInSchema());
-    dupRemoval.setTargets(PlannerUtil.schemaToTargets(outSchema));
-    dupRemoval.setGroupingColumns(outSchema.toArray());
-
-    block.registerNode(dupRemoval);
-    postHook(context, stack, null, dupRemoval);
-
-    projectionNode.setChild(dupRemoval);
-    projectionNode.setInSchema(dupRemoval.getOutSchema());
-  }
-
-  private Pair<String [], ExprNormalizer.WindowSpecReferences []> doProjectionPrephase(PlanContext context,
-                                                                                    Projection projection)
-      throws PlanningException {
-
-    QueryBlock block = context.queryBlock;
-
-    int finalTargetNum = projection.size();
-    String [] referenceNames = new String[finalTargetNum];
-    ExprNormalizedResult [] normalizedExprList = new ExprNormalizedResult[finalTargetNum];
-
-    List<ExprNormalizer.WindowSpecReferences> windowSpecReferencesList = TUtil.newList();
-
-    List<Integer> targetsIds = normalize(context, projection, normalizedExprList, new Matcher() {
-      @Override
-      public boolean isMatch(Expr expr) {
-        return ExprFinder.finds(expr, OpType.WindowFunction).size() == 0;
-      }
-    });
-
-    // Note: Why separate normalization and add(Named)Expr?
-    //
-    // ExprNormalizer internally makes use of the named exprs in NamedExprsManager.
-    // If we don't separate normalization work and addExprWithName, addExprWithName will find named exprs evaluated
-    // the same logical node. It will cause impossible evaluation in physical executors.
-    addNamedExprs(block, referenceNames, normalizedExprList, windowSpecReferencesList, projection, targetsIds);
-
-    targetsIds = normalize(context, projection, normalizedExprList, new Matcher() {
-      @Override
-      public boolean isMatch(Expr expr) {
-        return ExprFinder.finds(expr, OpType.WindowFunction).size() > 0;
-      }
-    });
-    addNamedExprs(block, referenceNames, normalizedExprList, windowSpecReferencesList, projection, targetsIds);
-
-    return new Pair<String[], ExprNormalizer.WindowSpecReferences []>(referenceNames,
-        windowSpecReferencesList.toArray(new ExprNormalizer.WindowSpecReferences[windowSpecReferencesList.size()]));
-  }
-
-  private interface Matcher {
-    public boolean isMatch(Expr expr);
-  }
-
-  public List<Integer> normalize(PlanContext context, Projection projection, ExprNormalizedResult [] normalizedExprList,
-                                 Matcher matcher) throws PlanningException {
-    List<Integer> targetIds = new ArrayList<Integer>();
-    for (int i = 0; i < projection.size(); i++) {
-      NamedExpr namedExpr = projection.getNamedExprs()[i];
-
-      if (PlannerUtil.existsAggregationFunction(namedExpr)) {
-        context.queryBlock.setAggregationRequire();
-      }
-
-      if (matcher.isMatch(namedExpr.getExpr())) {
-        // If a value is constant value, it adds the constant value with a proper name to the constant map
-        // of the current block
-        if (!namedExpr.hasAlias() && OpType.isLiteralType(namedExpr.getExpr().getType())) {
-          String generatedName = context.plan.generateUniqueColumnName(namedExpr.getExpr());
-          ConstEval constEval = (ConstEval) exprAnnotator.createEvalNode(context, namedExpr.getExpr(),
-              NameResolvingMode.RELS_ONLY);
-          context.getQueryBlock().addConstReference(generatedName, namedExpr.getExpr(), constEval);
-          normalizedExprList[i] = new ExprNormalizedResult(context, false);
-          normalizedExprList[i].baseExpr = new ColumnReferenceExpr(generatedName);
-
-        } else {
-          // dissect an expression into multiple parts (at most dissected into three parts)
-          normalizedExprList[i] = normalizer.normalize(context, namedExpr.getExpr());
-        }
-        targetIds.add(i);
-      }
-    }
-
-    return targetIds;
-  }
-
-  private void addNamedExprs(QueryBlock block, String [] referenceNames, ExprNormalizedResult [] normalizedExprList,
-                             List<ExprNormalizer.WindowSpecReferences> windowSpecReferencesList, Projection projection,
-                             List<Integer> targetIds) throws PlanningException {
-    for (int i : targetIds) {
-      NamedExpr namedExpr = projection.getNamedExprs()[i];
-      // Get all projecting references
-      if (namedExpr.hasAlias()) {
-        NamedExpr aliasedExpr = new NamedExpr(normalizedExprList[i].baseExpr, namedExpr.getAlias());
-        referenceNames[i] = block.namedExprsMgr.addNamedExpr(aliasedExpr);
-      } else {
-        referenceNames[i] = block.namedExprsMgr.addExpr(normalizedExprList[i].baseExpr);
-      }
-
-      // Add sub-expressions (i.e., aggregation part and scalar part) from dissected parts.
-      block.namedExprsMgr.addNamedExprArray(normalizedExprList[i].aggExprs);
-      block.namedExprsMgr.addNamedExprArray(normalizedExprList[i].scalarExprs);
-      block.namedExprsMgr.addNamedExprArray(normalizedExprList[i].windowAggExprs);
-
-      windowSpecReferencesList.addAll(normalizedExprList[i].windowSpecs);
-    }
-  }
-
-  /**
-   * It builds non-from statement (only expressions) like '<code>SELECT 1+3 as plus</code>'.
-   */
-  private EvalExprNode buildPlanForNoneFromStatement(PlanContext context, Stack<Expr> stack, Projection projection)
-      throws PlanningException {
-    LogicalPlan plan = context.plan;
-    QueryBlock block = context.queryBlock;
-
-    int finalTargetNum = projection.getNamedExprs().length;
-    Target [] targets = new Target[finalTargetNum];
-
-    for (int i = 0; i < targets.length; i++) {
-      NamedExpr namedExpr = projection.getNamedExprs()[i];
-      EvalNode evalNode = exprAnnotator.createEvalNode(context, namedExpr.getExpr(), NameResolvingMode.RELS_ONLY);
-      if (namedExpr.hasAlias()) {
-        targets[i] = new Target(evalNode, namedExpr.getAlias());
-      } else {
-        targets[i] = new Target(evalNode, context.plan.generateUniqueColumnName(namedExpr.getExpr()));
-      }
-    }
-    EvalExprNode evalExprNode = context.queryBlock.getNodeFromExpr(projection);
-    evalExprNode.setTargets(targets);
-    evalExprNode.setOutSchema(PlannerUtil.targetToSchema(targets));
-    // it's for debugging or unit testing
-    block.setRawTargets(targets);
-    return evalExprNode;
-  }
-
-  private Target [] buildTargets(PlanContext context, String[] referenceNames)
-      throws PlanningException {
-    QueryBlock block = context.queryBlock;
-
-    Target [] targets = new Target[referenceNames.length];
-
-    for (int i = 0; i < referenceNames.length; i++) {
-      String refName = referenceNames[i];
-      if (block.isConstReference(refName)) {
-        targets[i] = new Target(block.getConstByReference(refName), refName);
-      } else if (block.namedExprsMgr.isEvaluated(refName)) {
-        targets[i] = block.namedExprsMgr.getTarget(refName);
-      } else {
-        NamedExpr namedExpr = block.namedExprsMgr.getNamedExpr(refName);
-        EvalNode evalNode = exprAnnotator.createEvalNode(context, namedExpr.getExpr(),
-            NameResolvingMode.RELS_AND_SUBEXPRS);
-        block.namedExprsMgr.markAsEvaluated(refName, evalNode);
-        targets[i] = new Target(evalNode, refName);
-      }
-    }
-    return targets;
-  }
-
-  /**
-   * It checks if all targets of Projectable plan node can be evaluated from the child node.
-   * It can avoid potential errors which possibly occur in physical operators.
-   *
-   * @param block QueryBlock which includes the Projectable node
-   * @param projectable Projectable node to be valid
-   * @throws PlanningException
-   */
-  public static void verifyProjectedFields(QueryBlock block, Projectable projectable) throws PlanningException {
-    if (projectable instanceof GroupbyNode) {
-      GroupbyNode groupbyNode = (GroupbyNode) projectable;
-
-      if (!groupbyNode.isEmptyGrouping()) { // it should be targets instead of
-        int groupingKeyNum = groupbyNode.getGroupingColumns().length;
-
-        for (int i = 0; i < groupingKeyNum; i++) {
-          Target target = groupbyNode.getTargets()[i];
-          if (groupbyNode.getTargets()[i].getEvalTree().getType() == EvalType.FIELD) {
-            FieldEval grpKeyEvalNode = target.getEvalTree();
-            if (!groupbyNode.getInSchema().contains(grpKeyEvalNode.getColumnRef())) {
-              throwCannotEvaluateException(projectable, grpKeyEvalNode.getName());
-            }
-          }
-        }
-      }
-
-      if (groupbyNode.hasAggFunctions()) {
-        verifyIfEvalNodesCanBeEvaluated(projectable, groupbyNode.getAggFunctions());
-      }
-
-    } else if (projectable instanceof WindowAggNode) {
-      WindowAggNode windowAggNode = (WindowAggNode) projectable;
-
-      if (windowAggNode.hasPartitionKeys()) {
-        verifyIfColumnCanBeEvaluated(projectable.getInSchema(), projectable, windowAggNode.getPartitionKeys());
-      }
-
-      if (windowAggNode.hasAggFunctions()) {
-        verifyIfEvalNodesCanBeEvaluated(projectable, windowAggNode.getWindowFunctions());
-      }
-
-      if (windowAggNode.hasSortSpecs()) {
-        Column [] sortKeys = PlannerUtil.sortSpecsToSchema(windowAggNode.getSortSpecs()).toArray();
-        verifyIfColumnCanBeEvaluated(projectable.getInSchema(), projectable, sortKeys);
-      }
-
-      // verify targets except for function slots
-      for (int i = 0; i < windowAggNode.getTargets().length - windowAggNode.getWindowFunctions().length; i++) {
-        Target target = windowAggNode.getTargets()[i];
-        Set<Column> columns = EvalTreeUtil.findUniqueColumns(target.getEvalTree());
-        for (Column c : columns) {
-          if (!windowAggNode.getInSchema().contains(c)) {
-            throwCannotEvaluateException(projectable, c.getQualifiedName());
-          }
-        }
-      }
-
-    } else if (projectable instanceof RelationNode) {
-      RelationNode relationNode = (RelationNode) projectable;
-      verifyIfTargetsCanBeEvaluated(relationNode.getTableSchema(), (Projectable) relationNode);
-
-    } else {
-      verifyIfTargetsCanBeEvaluated(projectable.getInSchema(), projectable);
-    }
-  }
-
-  public static void verifyIfEvalNodesCanBeEvaluated(Projectable projectable, EvalNode[] evalNodes)
-      throws PlanningException {
-    for (EvalNode e : evalNodes) {
-      Set<Column> columns = EvalTreeUtil.findUniqueColumns(e);
-      for (Column c : columns) {
-        if (!projectable.getInSchema().contains(c)) {
-          throwCannotEvaluateException(projectable, c.getQualifiedName());
-        }
-      }
-    }
-  }
-
-  public static void verifyIfTargetsCanBeEvaluated(Schema baseSchema, Projectable projectable)
-      throws PlanningException {
-    for (Target target : projectable.getTargets()) {
-      Set<Column> columns = EvalTreeUtil.findUniqueColumns(target.getEvalTree());
-      for (Column c : columns) {
-        if (!baseSchema.contains(c)) {
-          throwCannotEvaluateException(projectable, c.getQualifiedName());
-        }
-      }
-    }
-  }
-
-  public static void verifyIfColumnCanBeEvaluated(Schema baseSchema, Projectable projectable, Column [] columns)
-      throws PlanningException {
-    for (Column c : columns) {
-      if (!baseSchema.contains(c)) {
-        throwCannotEvaluateException(projectable, c.getQualifiedName());
-      }
-    }
-  }
-
-  public static void throwCannotEvaluateException(Projectable projectable, String columnName) throws PlanningException {
-    if (projectable instanceof UnaryNode && ((UnaryNode) projectable).getChild().getType() == NodeType.GROUP_BY) {
-      throw new PlanningException(columnName
-          + " must appear in the GROUP BY clause or be used in an aggregate function at node ("
-          + projectable.getPID() + ")");
-    } else {
-      throw new PlanningException(String.format("Cannot evaluate the field \"%s\" at node (%d)",
-          columnName, projectable.getPID()));
-    }
-  }
-
-  private LogicalNode insertWindowAggNode(PlanContext context, LogicalNode child, Stack<Expr> stack,
-                                          String [] referenceNames,
-                                          ExprNormalizer.WindowSpecReferences [] windowSpecReferenceses)
-      throws PlanningException {
-    LogicalPlan plan = context.plan;
-    QueryBlock block = context.queryBlock;
-    WindowAggNode windowAggNode = context.plan.createNode(WindowAggNode.class);
-    if (child.getType() == NodeType.LIMIT) {
-      LimitNode limitNode = (LimitNode) child;
-      windowAggNode.setChild(limitNode.getChild());
-      windowAggNode.setInSchema(limitNode.getChild().getOutSchema());
-      limitNode.setChild(windowAggNode);
-    } else if (child.getType() == NodeType.SORT) {
-      SortNode sortNode = (SortNode) child;
-      windowAggNode.setChild(sortNode.getChild());
-      windowAggNode.setInSchema(sortNode.getChild().getOutSchema());
-      sortNode.setChild(windowAggNode);
-    } else {
-      windowAggNode.setChild(child);
-      windowAggNode.setInSchema(child.getOutSchema());
-    }
-
-    List<String> winFuncRefs = new ArrayList<String>();
-    List<WindowFunctionEval> winFuncs = new ArrayList<WindowFunctionEval>();
-    List<WindowSpec> rawWindowSpecs = Lists.newArrayList();
-    for (Iterator<NamedExpr> it = block.namedExprsMgr.getIteratorForUnevaluatedExprs(); it.hasNext();) {
-      NamedExpr rawTarget = it.next();
-      try {
-        EvalNode evalNode = exprAnnotator.createEvalNode(context, rawTarget.getExpr(),
-            NameResolvingMode.SUBEXPRS_AND_RELS);
-        if (evalNode.getType() == EvalType.WINDOW_FUNCTION) {
-          winFuncRefs.add(rawTarget.getAlias());
-          winFuncs.add((WindowFunctionEval) evalNode);
-          block.namedExprsMgr.markAsEvaluated(rawTarget.getAlias(), evalNode);
-
-          // TODO - Later, we also consider the possibility that a window function contains only a window name.
-          rawWindowSpecs.add(((WindowFunctionExpr) (rawTarget.getExpr())).getWindowSpec());
-        }
-      } catch (VerifyException ve) {
-      }
-    }
-
-    // we only consider one window definition.
-    if (windowSpecReferenceses[0].hasPartitionKeys()) {
-      Column [] partitionKeyColumns = new Column[windowSpecReferenceses[0].getPartitionKeys().length];
-      int i = 0;
-      for (String partitionKey : windowSpecReferenceses[0].getPartitionKeys()) {
-        if (block.namedExprsMgr.isEvaluated(partitionKey)) {
-          partitionKeyColumns[i++] = block.namedExprsMgr.getTarget(partitionKey).getNamedColumn();
-        } else {
-          throw new PlanningException("Each grouping column expression must be a scalar expression.");
-        }
-      }
-      windowAggNode.setPartitionKeys(partitionKeyColumns);
-    }
-
-    SortSpec [][] sortGroups = new SortSpec[rawWindowSpecs.size()][];
-
-    for (int winSpecIdx = 0; winSpecIdx < rawWindowSpecs.size(); winSpecIdx++) {
-      WindowSpec spec = rawWindowSpecs.get(winSpecIdx);
-      if (spec.hasOrderBy()) {
-        Sort.SortSpec [] sortSpecs = spec.getSortSpecs();
-        int sortNum = sortSpecs.length;
-        String [] sortKeyRefNames = windowSpecReferenceses[winSpecIdx].getOrderKeys();
-        SortSpec [] annotatedSortSpecs = new SortSpec[sortNum];
-
-        Column column;
-        for (int i = 0; i < sortNum; i++) {
-          if (block.namedExprsMgr.isEvaluated(sortKeyRefNames[i])) {
-            column = block.namedExprsMgr.getTarget(sortKeyRefNames[i]).getNamedColumn();
-          } else {
-            throw new IllegalStateException("Unexpected State: " + TUtil.arrayToString(sortSpecs));
-          }
-          annotatedSortSpecs[i] = new SortSpec(column, sortSpecs[i].isAscending(), sortSpecs[i].isNullFirst());
-        }
-
-        sortGroups[winSpecIdx] = annotatedSortSpecs;
-      } else {
-        sortGroups[winSpecIdx] = null;
-      }
-    }
-
-    for (int i = 0; i < winFuncRefs.size(); i++) {
-      WindowFunctionEval winFunc = winFuncs.get(i);
-      if (sortGroups[i] != null) {
-        winFunc.setSortSpecs(sortGroups[i]);
-      }
-    }
-
-    Target [] targets = new Target[referenceNames.length];
-    List<Integer> windowFuncIndices = Lists.newArrayList();
-    Projection projection = (Projection) stack.peek();
-    int windowFuncIdx = 0;
-    for (NamedExpr expr : projection.getNamedExprs()) {
-      if (expr.getExpr().getType() == OpType.WindowFunction) {
-        windowFuncIndices.add(windowFuncIdx);
-      }
-      windowFuncIdx++;
-    }
-    windowAggNode.setWindowFunctions(winFuncs.toArray(new WindowFunctionEval[winFuncs.size()]));
-
-    int targetIdx = 0;
-    for (int i = 0; i < referenceNames.length ; i++) {
-      if (!windowFuncIndices.contains(i)) {
-        if (block.isConstReference(referenceNames[i])) {
-          targets[targetIdx++] = new Target(block.getConstByReference(referenceNames[i]), referenceNames[i]);
-        } else {
-          targets[targetIdx++] = block.namedExprsMgr.getTarget(referenceNames[i]);
-        }
-      }
-    }
-    for (int i = 0; i < winFuncRefs.size(); i++) {
-      targets[targetIdx++] = block.namedExprsMgr.getTarget(winFuncRefs.get(i));
-    }
-    windowAggNode.setTargets(targets);
-    verifyProjectedFields(block, windowAggNode);
-
-    block.registerNode(windowAggNode);
-    postHook(context, stack, null, windowAggNode);
-
-    if (child.getType() == NodeType.LIMIT) {
-      LimitNode limitNode = (LimitNode) child;
-      limitNode.setInSchema(windowAggNode.getOutSchema());
-      limitNode.setOutSchema(windowAggNode.getOutSchema());
-      return null;
-    } else if (child.getType() == NodeType.SORT) {
-      SortNode sortNode = (SortNode) child;
-      sortNode.setInSchema(windowAggNode.getOutSchema());
-      sortNode.setOutSchema(windowAggNode.getOutSchema());
-      return null;
-    } else {
-      return windowAggNode;
-    }
-  }
-
-  /**
-   * Insert a group-by operator before a sort or a projection operator.
-   * It is used only when a group-by clause is not given.
-   */
-  private LogicalNode insertGroupbyNode(PlanContext context, LogicalNode child, Stack<Expr> stack)
-      throws PlanningException {
-
-    LogicalPlan plan = context.plan;
-    QueryBlock block = context.queryBlock;
-    GroupbyNode groupbyNode = context.plan.createNode(GroupbyNode.class);
-    groupbyNode.setChild(child);
-    groupbyNode.setInSchema(child.getOutSchema());
-
-    groupbyNode.setGroupingColumns(new Column[] {});
-
-    Set<String> aggEvalNames = new LinkedHashSet<String>();
-    Set<AggregationFunctionCallEval> aggEvals = new LinkedHashSet<AggregationFunctionCallEval>();
-    boolean includeDistinctFunction = false;
-    for (Iterator<NamedExpr> it = block.namedExprsMgr.getIteratorForUnevaluatedExprs(); it.hasNext();) {
-      NamedExpr rawTarget = it.next();
-      try {
-        // check if at least distinct aggregation function
-        includeDistinctFunction |= PlannerUtil.existsDistinctAggregationFunction(rawTarget.getExpr());
-        EvalNode evalNode = exprAnnotator.createEvalNode(context, rawTarget.getExpr(),
-            NameResolvingMode.SUBEXPRS_AND_RELS);
-        if (evalNode.getType() == EvalType.AGG_FUNCTION) {
-          aggEvalNames.add(rawTarget.getAlias());
-          aggEvals.add((AggregationFunctionCallEval) evalNode);
-          block.namedExprsMgr.markAsEvaluated(rawTarget.getAlias(), evalNode);
-        }
-      } catch (VerifyException ve) {
-      }
-    }
-
-    groupbyNode.setDistinct(includeDistinctFunction);
-    groupbyNode.setAggFunctions(aggEvals.toArray(new AggregationFunctionCallEval[aggEvals.size()]));
-    Target [] targets = ProjectionPushDownRule.buildGroupByTarget(groupbyNode, null,
-        aggEvalNames.toArray(new String[aggEvalNames.size()]));
-    groupbyNode.setTargets(targets);
-
-    // this inserted group-by node doesn't pass through preprocessor. So manually added.
-    block.registerNode(groupbyNode);
-    postHook(context, stack, null, groupbyNode);
-
-    verifyProjectedFields(block, groupbyNode);
-    return groupbyNode;
-  }
-
-  /*===============================================================================================
-    SORT SECTION
-  ===============================================================================================*/
-  @Override
-  public LimitNode visitLimit(PlanContext context, Stack<Expr> stack, Limit limit) throws PlanningException {
-    QueryBlock block = context.queryBlock;
-
-    EvalNode firstFetNum;
-    LogicalNode child;
-    if (limit.getFetchFirstNum().getType() == OpType.Literal) {
-      firstFetNum = exprAnnotator.createEvalNode(context, limit.getFetchFirstNum(),
-          NameResolvingMode.RELS_ONLY);
-
-      ////////////////////////////////////////////////////////
-      // Visit and Build Child Plan
-      ////////////////////////////////////////////////////////
-      stack.push(limit);
-      child = visit(context, stack, limit.getChild());
-      stack.pop();
-      ////////////////////////////////////////////////////////
-    } else {
-      ExprNormalizedResult normalizedResult = normalizer.normalize(context, limit.getFetchFirstNum());
-      String referName = block.namedExprsMgr.addExpr(normalizedResult.baseExpr);
-      block.namedExprsMgr.addNamedExprArray(normalizedResult.aggExprs);
-      block.namedExprsMgr.addNamedExprArray(normalizedResult.scalarExprs);
-
-      ////////////////////////////////////////////////////////
-      // Visit and Build Child Plan
-      ////////////////////////////////////////////////////////
-      stack.push(limit);
-      child = visit(context, stack, limit.getChild());
-      stack.pop();
-      ////////////////////////////////////////////////////////
-
-      if (block.namedExprsMgr.isEvaluated(referName)) {
-        firstFetNum = block.namedExprsMgr.getTarget(referName).getEvalTree();
-      } else {
-        NamedExpr namedExpr = block.namedExprsMgr.getNamedExpr(referName);
-        firstFetNum = exprAnnotator.createEvalNode(context, namedExpr.getExpr(), NameResolvingMode.SUBEXPRS_AND_RELS);
-        block.namedExprsMgr.markAsEvaluated(referName, firstFetNum);
-      }
-    }
-    LimitNode limitNode = block.getNodeFromExpr(limit);
-    limitNode.setChild(child);
-    limitNode.setInSchema(child.getOutSchema());
-    limitNode.setOutSchema(child.getOutSchema());
-
-    limitNode.setFetchFirst(firstFetNum.eval(null, null).asInt8());
-
-    return limitNode;
-  }
-
-  @Override
-  public LogicalNode visitSort(PlanContext context, Stack<Expr> stack, Sort sort) throws PlanningException {
-    QueryBlock block = context.queryBlock;
-
-    int sortKeyNum = sort.getSortSpecs().length;
-    Sort.SortSpec[] sortSpecs = sort.getSortSpecs();
-    String [] referNames = new String[sortKeyNum];
-
-    ExprNormalizedResult [] normalizedExprList = new ExprNormalizedResult[sortKeyNum];
-    for (int i = 0; i < sortKeyNum; i++) {
-      normalizedExprList[i] = normalizer.normalize(context, sortSpecs[i].getKey());
-    }
-    for (int i = 0; i < sortKeyNum; i++) {
-      referNames[i] = block.namedExprsMgr.addExpr(normalizedExprList[i].baseExpr);
-      block.namedExprsMgr.addNamedExprArray(normalizedExprList[i].aggExprs);
-      block.namedExprsMgr.addNamedExprArray(normalizedExprList[i].scalarExprs);
-    }
-
-    ////////////////////////////////////////////////////////
-    // Visit and Build Child Plan
-    ////////////////////////////////////////////////////////
-    stack.push(sort);
-    LogicalNode child = visit(context, stack, sort.getChild());
-    if (block.isAggregationRequired()) {
-      child = insertGroupbyNode(context, child, stack);
-    }
-    stack.pop();
-    ////////////////////////////////////////////////////////
-
-    SortNode sortNode = block.getNodeFromExpr(sort);
-    sortNode.setChild(child);
-    sortNode.setInSchema(child.getOutSchema());
-    sortNode.setOutSchema(child.getOutSchema());
-
-
-    // Building sort keys
-    Column column;
-    List<SortSpec> annotatedSortSpecs = Lists.newArrayList();
-    for (int i = 0; i < sortKeyNum; i++) {
-      String refName = referNames[i];
-      if (block.isConstReference(refName)) {
-        continue;
-      } else if (block.namedExprsMgr.isEvaluated(refName)) {
-        column = block.namedExprsMgr.getTarget(refName).getNamedColumn();
-      } else {
-        throw new IllegalStateException("Unexpected State: " + TUtil.arrayToString(sortSpecs));
-      }
-      annotatedSortSpecs.add(new SortSpec(column, sortSpecs[i].isAscending(), sortSpecs[i].isNullFirst()));
-    }
-
-    if (annotatedSortSpecs.size() == 0) {
-      return child;
-    } else {
-      sortNode.setSortSpecs(annotatedSortSpecs.toArray(new SortSpec[annotatedSortSpecs.size()]));
-      return sortNode;
-    }
-  }
-
-  /*===============================================================================================
-    GROUP BY SECTION
-   ===============================================================================================*/
-
-  @Override
-  public LogicalNode visitHaving(PlanContext context, Stack<Expr> stack, Having expr) throws PlanningException {
-    QueryBlock block = context.queryBlock;
-
-    ExprNormalizedResult normalizedResult = normalizer.normalize(context, expr.getQual());
-    String referName = block.namedExprsMgr.addExpr(normalizedResult.baseExpr);
-    block.namedExprsMgr.addNamedExprArray(normalizedResult.aggExprs);
-    block.namedExprsMgr.addNamedExprArray(normalizedResult.scalarExprs);
-
-    ////////////////////////////////////////////////////////
-    // Visit and Build Child Plan
-    ////////////////////////////////////////////////////////
-    stack.push(expr);
-    LogicalNode child = visit(context, stack, expr.getChild());
-    stack.pop();
-    ////////////////////////////////////////////////////////
-
-    HavingNode having = context.queryBlock.getNodeFromExpr(expr);
-    having.setChild(child);
-    having.setInSchema(child.getOutSchema());
-    having.setOutSchema(child.getOutSchema());
-
-    EvalNode havingCondition;
-    if (block.namedExprsMgr.isEvaluated(referName)) {
-      havingCondition = block.namedExprsMgr.getTarget(referName).getEvalTree();
-    } else {
-      NamedExpr namedExpr = block.namedExprsMgr.getNamedExpr(referName);
-      havingCondition = exprAnnotator.createEvalNode(context, namedExpr.getExpr(),
-          NameResolvingMode.SUBEXPRS_AND_RELS);
-      block.namedExprsMgr.markAsEvaluated(referName, havingCondition);
-    }
-
-    // set having condition
-    having.setQual(havingCondition);
-
-    return having;
-  }
-
-  @Override
-  public LogicalNode visitGroupBy(PlanContext context, Stack<Expr> stack, Aggregation aggregation)
-      throws PlanningException {
-
-    // Initialization Phase:
-    LogicalPlan plan = context.plan;
-    QueryBlock block = context.queryBlock;
-
-    // Normalize grouping keys and add normalized grouping keys to NamedExprManager
-    int groupingKeyNum = aggregation.getGroupSet()[0].getGroupingSets().length;
-    ExprNormalizedResult [] normalizedResults = new ExprNormalizedResult[groupingKeyNum];
-    for (int i = 0; i < groupingKeyNum; i++) {
-      Expr groupingKey = aggregation.getGroupSet()[0].getGroupingSets()[i];
-      normalizedResults[i] = normalizer.normalize(context, groupingKey);
-    }
-
-    String [] groupingKeyRefNames = new String[groupingKeyNum];
-    for (int i = 0; i < groupingKeyNum; i++) {
-      groupingKeyRefNames[i] = block.namedExprsMgr.addExpr(normalizedResults[i].baseExpr);
-      block.namedExprsMgr.addNamedExprArray(normalizedResults[i].aggExprs);
-      block.namedExprsMgr.addNamedExprArray(normalizedResults[i].scalarExprs);
-    }
-
-    ////////////////////////////////////////////////////////
-    // Visit and Build Child Plan
-    ////////////////////////////////////////////////////////
-    stack.push(aggregation);
-    LogicalNode child = visit(context, stack, aggregation.getChild());
-    stack.pop();
-    ////////////////////////////////////////////////////////
-    GroupbyNode groupingNode = context.queryBlock.getNodeFromExpr(aggregation);
-    groupingNode.setChild(child);
-    groupingNode.setInSchema(child.getOutSchema());
-
-    // Set grouping sets
-    List<Column> groupingColumns = Lists.newArrayList();
-    for (int i = 0; i < groupingKeyRefNames.length; i++) {
-      String refName = groupingKeyRefNames[i];
-      if (context.getQueryBlock().isConstReference(refName)) {
-        continue;
-      } else if (block.namedExprsMgr.isEvaluated(groupingKeyRefNames[i])) {
-        groupingColumns.add(block.namedExprsMgr.getTarget(groupingKeyRefNames[i]).getNamedColumn());
-      } else {
-        throw new PlanningException("Each grouping column expression must be a scalar expression.");
-      }
-    }
-
-    int effectiveGroupingKeyNum = groupingColumns.size();
-    groupingNode.setGroupingColumns(groupingColumns.toArray(new Column[effectiveGroupingKeyNum]));
-
-    ////////////////////////////////////////////////////////
-    // Visit and Build Child Plan
-    ////////////////////////////////////////////////////////
-
-    // create EvalNodes and check if each EvalNode can be evaluated here.
-    List<String> aggEvalNames = TUtil.newList();
-    List<AggregationFunctionCallEval> aggEvalNodes = TUtil.newList();
-    boolean includeDistinctFunction = false;
-    for (Iterator<NamedExpr> iterator = block.namedExprsMgr.getIteratorForUnevaluatedExprs(); iterator.hasNext();) {
-      NamedExpr namedExpr = iterator.next();
-      try {
-        includeDistinctFunction |= PlannerUtil.existsDistinctAggregationFunction(namedExpr.getExpr());
-        EvalNode evalNode = exprAnnotator.createEvalNode(context, namedExpr.getExpr(),
-            NameResolvingMode.SUBEXPRS_AND_RELS);
-        if (evalNode.getType() == EvalType.AGG_FUNCTION) {
-          block.namedExprsMgr.markAsEvaluated(namedExpr.getAlias(), evalNode);
-          aggEvalNames.add(namedExpr.getAlias());
-          aggEvalNodes.add((AggregationFunctionCallEval) evalNode);
-        }
-      } catch (VerifyException ve) {
-      }
-    }
-    // if there is at least one distinct aggregation function
-    groupingNode.setDistinct(includeDistinctFunction);
-    groupingNode.setAggFunctions(aggEvalNodes.toArray(new AggregationFunctionCallEval[aggEvalNodes.size()]));
-
-    Target [] targets = new Target[effectiveGroupingKeyNum + aggEvalNames.size()];
-
-    // In target, grouping columns will be followed by aggregation evals.
-    //
-    // col1, col2, col3,   sum(..),  agv(..)
-    // ^^^^^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^
-    //  grouping keys      aggregation evals
-
-    // Build grouping keys
-    for (int i = 0; i < effectiveGroupingKeyNum; i++) {
-      Target target = block.namedExprsMgr.getTarget(groupingNode.getGroupingColumns()[i].getQualifiedName());
-      targets[i] = target;
-    }
-
-    for (int i = 0, targetIdx = effectiveGroupingKeyNum; i < aggEvalNodes.size(); i++, targetIdx++) {
-      targets[targetIdx] = block.namedExprsMgr.getTarget(aggEvalNames.get(i));
-    }
-
-    groupingNode.setTargets(targets);
-    block.unsetAggregationRequire();
-
-    verifyProjectedFields(block, groupingNode);
-    return groupingNode;
-  }
-
-  private static final Column[] ALL= Lists.newArrayList().toArray(new Column[0]);
-
-  public static List<Column[]> generateCuboids(Column[] columns) {
-    int numCuboids = (int) Math.pow(2, columns.length);
-    int maxBits = columns.length;
-
-    List<Column[]> cube = Lists.newArrayList();
-    List<Column> cuboidCols;
-
-    cube.add(ALL);
-    for (int cuboidId = 1; cuboidId < numCuboids; cuboidId++) {
-      cuboidCols = Lists.newArrayList();
-      for (int j = 0; j < maxBits; j++) {
-        int bit = 1 << j;
-        if ((cuboidId & bit) == bit) {
-          cuboidCols.add(columns[j]);
-        }
-      }
-      cube.add(cuboidCols.toArray(new Column[cuboidCols.size()]));
-    }
-    return cube;
-  }
-
-  @Override
-  public SelectionNode visitFilter(PlanContext context, Stack<Expr> stack, Selection selection)
-      throws PlanningException {
-    QueryBlock block = context.queryBlock;
-
-    ExprNormalizedResult normalizedResult = normalizer.normalize(context, selection.getQual());
-    block.namedExprsMgr.addExpr(normalizedResult.baseExpr);
-    if (normalizedResult.aggExprs.size() > 0 || normalizedResult.scalarExprs.size() > 0) {
-      throw new VerifyException("Filter condition cannot include aggregation function");
-    }
-
-    ////////////////////////////////////////////////////////
-    // Visit and Build Child Plan
-    ////////////////////////////////////////////////////////
-    stack.push(selection);
-    LogicalNode child = visit(context, stack, selection.getChild());
-    stack.pop();
-    ////////////////////////////////////////////////////////
-
-    SelectionNode selectionNode = context.queryBlock.getNodeFromExpr(selection);
-    selectionNode.setChild(child);
-    selectionNode.setInSchema(child.getOutSchema());
-    selectionNode.setOutSchema(child.getOutSchema());
-
-    // Create EvalNode for a search condition.
-    EvalNode searchCondition = exprAnnotator.createEvalNode(context, selection.getQual(),
-        NameResolvingMode.RELS_AND_SUBEXPRS);
-    EvalNode simplified = context.evalOptimizer.optimize(context, searchCondition);
-    // set selection condition
-    selectionNode.setQual(simplified);
-
-    return selectionNode;
-  }
-
-  /*===============================================================================================
-    JOIN SECTION
-   ===============================================================================================*/
-
-  @Override
-  public LogicalNode visitJoin(PlanContext context, Stack<Expr> stack, Join join)
-      throws PlanningException {
-    // Phase 1: Init
-    LogicalPlan plan = context.plan;
-    QueryBlock block = context.queryBlock;
-
-    if (join.hasQual()) {
-      ExprNormalizedResult normalizedResult = normalizer.normalize(context, join.getQual(), true);
-      block.namedExprsMgr.addExpr(normalizedResult.baseExpr);
-      if (normalizedResult.aggExprs.size() > 0 || normalizedResult.scalarExprs.size() > 0) {
-        throw new VerifyException("Filter condition cannot include aggregation function");
-      }
-    }
-
-    ////////////////////////////////////////////////////////
-    // Visit and Build Child Plan
-    ////////////////////////////////////////////////////////
-    stack.push(join);
-    LogicalNode left = visit(context, stack, join.getLeft());
-    LogicalNode right = visit(context, stack, join.getRight());
-    stack.pop();
-    ////////////////////////////////////////////////////////
-
-    JoinNode joinNode = context.queryBlock.getNodeFromExpr(join);
-    joinNode.setJoinType(join.getJoinType());
-    joinNode.setLeftChild(left);
-    joinNode.setRightChild(right);
-
-    // Set A merged input schema
-    Schema merged;
-    if (join.isNatural()) {
-      merged = getNaturalJoinSchema(left, right);
-    } else {
-      merged = SchemaUtil.merge(left.getOutSchema(), right.getOutSchema());
-    }
-    joinNode.setInSchema(merged);
-
-    // Create EvalNode for a search condition.
-    EvalNode joinCondition = null;
-    if (join.hasQual()) {
-      EvalNode evalNode = exprAnnotator.createEvalNode(context, join.getQual(), NameResolvingMode.LEGACY);
-      joinCondition = context.evalOptimizer.optimize(context, evalNode);
-    }
-
-    List<String> newlyEvaluatedExprs = getNewlyEvaluatedExprsForJoin(context, joinNode, stack);
-    List<Target> targets = TUtil.newList(PlannerUtil.schemaToTargets(merged));
-
-    for (String newAddedExpr : newlyEvaluatedExprs) {
-      targets.add(block.namedExprsMgr.getTarget(newAddedExpr, true));
-    }
-    joinNode.setTargets(targets.toArray(new Target[targets.size()]));
-
-    // Determine join conditions
-    if (join.isNatural()) { // if natural join, it should have the equi-join conditions by common column names
-      EvalNode njCond = getNaturalJoinCondition(joinNode);
-      joinNode.setJoinQual(njCond);
-    } else if (join.hasQual()) { // otherwise, the given join conditions are set
-      joinNode.setJoinQual(joinCondition);
-    }
-
-    return joinNode;
-  }
-
-  private List<String> getNewlyEvaluatedExprsForJoin(PlanContext context, JoinNode joinNode, Stack<Expr> stack) {
-    QueryBlock block = context.queryBlock;
-
-    EvalNode evalNode;
-    List<String> newlyEvaluatedExprs = TUtil.newList();
-    for (Iterator<NamedExpr> it = block.namedExprsMgr.getIteratorForUnevaluatedExprs(); it.hasNext();) {
-      NamedExpr namedExpr = it.next();
-      try {
-        evalNode = exprAnnotator.createEvalNode(context, namedExpr.getExpr(), NameResolvingMode.LEGACY);
-        if (LogicalPlanner.checkIfBeEvaluatedAtJoin(block, evalNode, joinNode, stack.peek().getType() != OpType.Join)) {
-          block.namedExprsMgr.markAsEvaluated(namedExpr.getAlias(), evalNode);
-          newlyEvaluatedExprs.add(namedExpr.getAlias());
-        }
-      } catch (VerifyException ve) {
-      } catch (PlanningException e) {
-      }
-    }
-    return newlyEvaluatedExprs;
-  }
-
-  private static Schema getNaturalJoinSchema(LogicalNode left, LogicalNode right) {
-    Schema joinSchema = new Schema();
-    Schema commons = SchemaUtil.getNaturalJoinColumns(left.getOutSchema(), right.getOutSchema());
-    joinSchema.addColumns(commons);
-    for (Column c : left.getOutSchema().getColumns()) {
-      if (!joinSchema.contains(c.getQualifiedName())) {
-        joinSchema.addColumn(c);
-      }
-    }
-
-    for (Column c : right.getOutSchema().getColumns()) {
-      if (!joinSchema.contains(c.getQualifiedName())) {
-        joinSchema.addColumn(c);
-      }
-    }
-    return joinSchema;
-  }
-
-  private static EvalNode getNaturalJoinCondition(JoinNode joinNode) {
-    Schema leftSchema = joinNode.getLeftChild().getInSchema();
-    Schema rightSchema = joinNode.getRightChild().getInSchema();
-    Schema commons = SchemaUtil.getNaturalJoinColumns(leftSchema, rightSchema);
-
-    EvalNode njQual = null;
-    EvalNode equiQual;
-    Column leftJoinKey;
-    Column rightJoinKey;
-
-    for (Column common : commons.getColumns()) {
-      leftJoinKey = leftSchema.getColumn(common.getQualifiedName());
-      rightJoinKey = rightSchema.getColumn(common.getQualifiedName());
-      equiQual = new BinaryEval(EvalType.EQUAL,
-          new FieldEval(leftJoinKey), new FieldEval(rightJoinKey));
-      if (njQual == null) {
-        njQual = equiQual;
-      } else {
-        njQual = new BinaryEval(EvalType.AND, njQual, equiQual);
-      }
-    }
-
-    return njQual;
-  }
-
-  private LogicalNode createCartesianProduct(PlanContext context, LogicalNode left, LogicalNode right)
-      throws PlanningException {
-    LogicalPlan plan = context.plan;
-    QueryBlock block = context.queryBlock;
-
-    Schema merged = SchemaUtil.merge(left.getOutSchema(), right.getOutSchema());
-    JoinNode join = plan.createNode(JoinNode.class);
-    join.init(JoinType.CROSS, left, right);
-    join.setInSchema(merged);
-
-    EvalNode evalNode;
-    List<String> newlyEvaluatedExprs = TUtil.newList();
-    for (Iterator<NamedExpr> it = block.namedExprsMgr.getIteratorForUnevaluatedExprs(); it.hasNext();) {
-      NamedExpr namedExpr = it.next();
-      try {
-        evalNode = exprAnnotator.createEvalNode(context, namedExpr.getExpr(), NameResolvingMode.LEGACY);
-        if (EvalTreeUtil.findDistinctAggFunction(evalNode).size() == 0) {
-          block.namedExprsMgr.markAsEvaluated(namedExpr.getAlias(), evalNode);
-          newlyEvaluatedExprs.add(namedExpr.getAlias());
-        }
-      } catch (VerifyException ve) {}
-    }
-
-    List<Target> targets = TUtil.newList(PlannerUtil.schemaToTargets(merged));
-    for (String newAddedExpr : newlyEvaluatedExprs) {
-      targets.add(block.namedExprsMgr.getTarget(newAddedExpr, true));
-    }
-    join.setTargets(targets.toArray(new Target[targets.size()]));
-    return join;
-  }
-
-  @Override
-  public LogicalNode visitRelationList(PlanContext context, Stack<Expr> stack, RelationList relations)
-      throws PlanningException {
-
-    LogicalNode current = visit(context, stack, relations.getRelations()[0]);
-
-    LogicalNode left;
-    LogicalNode right;
-    if (relations.size() > 1) {
-
-      for (int i = 1; i < relations.size(); i++) {
-        left = current;
-        right = visit(context, stack, relations.getRelations()[i]);
-        current = createCartesianProduct(context, left, right);
-      }
-    }
-    context.queryBlock.registerNode(current);
-
-    return current;
-  }
-
-  @Override
-  public ScanNode visitRelation(PlanContext context, Stack<Expr> stack, Relation expr)
-      throws PlanningException {
-    QueryBlock block = context.queryBlock;
-
-    ScanNode scanNode = block.getNodeFromExpr(expr);
-    updatePhysicalInfo(scanNode.getTableDesc());
-
-    // Find expression which can be evaluated at this relation node.
-    // Except for column references, additional expressions used in select list, where clause, order-by clauses
-    // can be evaluated here. Their reference names are kept in newlyEvaluatedExprsRef.
-    Set<String> newlyEvaluatedExprsReferences = new LinkedHashSet<String>();
-    for (Iterator<NamedExpr> iterator = block.namedExprsMgr.getIteratorForUnevaluatedExprs(); iterator.hasNext();) {
-      NamedExpr rawTarget = iterator.next();
-      try {
-        EvalNode evalNode = exprAnnotator.createEvalNode(context, rawTarget.getExpr(),
-            NameResolvingMode.RELS_ONLY);
-        if (checkIfBeEvaluatedAtRelation(block, evalNode, scanNode)) {
-          block.namedExprsMgr.markAsEvaluated(rawTarget.getAlias(), evalNode);
-          newlyEvaluatedExprsReferences.add(rawTarget.getAlias()); // newly added exr
-        }
-      } catch (VerifyException ve) {
-      }
-    }
-
-    // Assume that each unique expr is evaluated once.
-    LinkedHashSet<Target> targets = createFieldTargetsFromRelation(block, scanNode, newlyEvaluatedExprsReferences);
-
-    // The fact the some expr is included in newlyEvaluatedExprsReferences means that it is already evaluated.
-    // So, we get a raw expression and then creates a target.
-    for (String reference : newlyEvaluatedExprsReferences) {
-      NamedExpr refrer = block.namedExprsMgr.getNamedExpr(reference);
-      EvalNode evalNode = exprAnnotator.createEvalNode(context, refrer.getExpr(), NameResolvingMode.RELS_ONLY);
-      targets.add(new Target(evalNode, reference));
-    }
-
-    scanNode.setTargets(targets.toArray(new Target[targets.size()]));
-
-    verifyProjectedFields(block, scanNode);
-    return scanNode;
-  }
-
-  private static LinkedHashSet<Target> createFieldTargetsFromRelation(QueryBlock block, RelationNode relationNode,
-                                                      Set<String> newlyEvaluatedRefNames) {
-    LinkedHashSet<Target> targets = Sets.newLinkedHashSet();
-    for (Column column : relationNode.getTableSchema().getColumns()) {
-      String aliasName = block.namedExprsMgr.checkAndGetIfAliasedColumn(column.getQualifiedName());
-      if (aliasName != null) {
-        targets.add(new Target(new FieldEval(column), aliasName));
-        newlyEvaluatedRefNames.remove(aliasName);
-      } else {
-        targets.add(new Target(new FieldEval(column)));
-      }
-    }
-    return targets;
-  }
-
-  private void updatePhysicalInfo(TableDesc desc) {
-    if (desc.getPath() != null) {
-      try {
-        FileSystem fs = desc.getPath().getFileSystem(new Configuration());
-        FileStatus status = fs.getFileStatus(desc.getPath());
-        if (desc.getStats() != null && (status.isDirectory() || status.isFile())) {
-          ContentSummary summary = fs.getContentSummary(desc.getPath());
-          if (summary != null) {
-            long volume = summary.getLength();
-            desc.getStats().setNumBytes(volume);
-          }
-        }
-      } catch (Throwable t) {
-        LOG.warn(t);
-      }
-    }
-  }
-
-  public TableSubQueryNode visitTableSubQuery(PlanContext context, Stack<Expr> stack, TablePrimarySubQuery expr)
-      throws PlanningException {
-    QueryBlock block = context.queryBlock;
-
-    QueryBlock childBlock = context.plan.getBlock(context.plan.getBlockNameByExpr(expr.getSubQuery()));
-    PlanContext newContext = new PlanContext(context, childBlock);
-    LogicalNode child = visit(newContext, new Stack<Expr>(), expr.getSubQuery());
-    TableSubQueryNode subQueryNode = context.queryBlock.getNodeFromExpr(expr);
-    context.plan.connectBlocks(childBlock, context.queryBlock, BlockType.TableSubQuery);
-    subQueryNode.setSubQuery(child);
-
-    // Add additional expressions required in upper nodes.
-    Set<String> newlyEvaluatedExprs = TUtil.newHashSet();
-    for (NamedExpr rawTarget : block.namedExprsMgr.getAllNamedExprs()) {
-      try {
-        EvalNode evalNode = exprAnnotator.createEvalNode(context, rawTarget.getExpr(),
-            NameResolvingMode.RELS_ONLY);
-        if (checkIfBeEvaluatedAtRelation(block, evalNode, subQueryNode)) {
-          block.namedExprsMgr.markAsEvaluated(rawTarget.getAlias(), evalNode);
-          newlyEvaluatedExprs.add(rawTarget.getAlias()); // newly added exr
-        }
-      } catch (VerifyException ve) {
-      }
-    }
-
-    // Assume that each unique expr is evaluated once.
-    LinkedHashSet<Target> targets = createFieldTargetsFromRelation(block, subQueryNode, newlyEvaluatedExprs);
-
-    for (String newAddedExpr : newlyEvaluatedExprs) {
-      targets.add(block.namedExprsMgr.getTarget(newAddedExpr, true));
-    }
-
-    subQueryNode.setTargets(targets.toArray(new Target[targets.size()]));
-
-    return subQueryNode;
-  }
-
-    /*===============================================================================================
-    SET OPERATION SECTION
-   ===============================================================================================*/
-
-  @Override
-  public LogicalNode visitUnion(PlanContext context, Stack<Expr> stack, SetOperation setOperation)
-      throws PlanningException {
-    return buildSetPlan(context, stack, setOperation);
-  }
-
-  @Override
-  public LogicalNode visitExcept(PlanContext context, Stack<Expr> stack, SetOperation setOperation)
-      throws PlanningException {
-    return buildSetPlan(context, stack, setOperation);
-  }
-
-  @Override
-  public LogicalNode visitIntersect(PlanContext context, Stack<Expr> stack, SetOperation setOperation)
-      throws PlanningException {
-    return buildSetPlan(context, stack, setOperation);
-  }
-
-  private LogicalNode buildSetPlan(PlanContext context, Stack<Expr> stack, SetOperation setOperation)
-      throws PlanningException {
-
-    // 1. Init Phase
-    LogicalPlan plan = context.plan;
-    QueryBlock block = context.queryBlock;
-
-    ////////////////////////////////////////////////////////
-    // Visit and Build Left Child Plan
-    ////////////////////////////////////////////////////////
-    QueryBlock leftBlock = context.plan.getBlockByExpr(setOperation.getLeft());
-    PlanContext leftContext = new PlanContext(context, leftBlock);
-    stack.push(setOperation);
-    LogicalNode leftChild = visit(leftContext, new Stack<Expr>(), setOperation.getLeft());
-    stack.pop();
-    // Connect left child and current blocks
-    context.plan.connectBlocks(leftContext.queryBlock, context.queryBlock, BlockType.TableSubQuery);
-
-    ////////////////////////////////////////////////////////
-    // Visit and Build Right Child Plan
-    ////////////////////////////////////////////////////////
-    QueryBlock rightBlock = context.plan.getBlockByExpr(setOperation.getRight());
-    PlanContext rightContext = new PlanContext(context, rightBlock);
-    stack.push(setOperation);
-    LogicalNode rightChild = visit(rightContext, new Stack<Expr>(), setOperation.getRight());
-    stack.pop();
-    // Connect right child and current blocks
-    context.plan.connectBlocks(rightContext.queryBlock, context.queryBlock, BlockType.TableSubQuery);
-
-    BinaryNode setOp;
-    if (setOperation.getType() == OpType.Union) {
-      setOp = block.getNodeFromExpr(setOperation);
-    } else if (setOperation.getType() == OpType.Except) {
-      setOp = block.getNodeFromExpr(setOperation);
-    } else if (setOperation.getType() == OpType.Intersect) {
-      setOp = block.getNodeFromExpr(setOperation);
-    } else {
-      throw new VerifyException("Invalid Type: " + setOperation.getType());
-    }
-    setOp.setLeftChild(leftChild);
-    setOp.setRightChild(rightChild);
-
-    // An union statement can be derived from two query blocks.
-    // For one union statement between both relations, we can ensure that each corresponding data domain of both
-    // relations are the same. However, if necessary, the schema of left query block will be used as a base schema.
-    Target [] leftStrippedTargets = PlannerUtil.stripTarget(
-        PlannerUtil.schemaToTargets(leftBlock.getRoot().getOutSchema()));
-
-    setOp.setInSchema(leftChild.getOutSchema());
-    Schema outSchema = PlannerUtil.targetToSchema(leftStrippedTargets);
-    setOp.setOutSchema(outSchema);
-
-    return setOp;
-  }
-
-  /*===============================================================================================
-    INSERT SECTION
-   ===============================================================================================*/
-
-  public LogicalNode visitInsert(PlanContext context, Stack<Expr> stack, Insert expr) throws PlanningException {
-    stack.push(expr);
-    LogicalNode subQuery = super.visitInsert(context, stack, expr);
-    stack.pop();
-
-    InsertNode insertNode = context.queryBlock.getNodeFromExpr(expr);
-    insertNode.setOverwrite(expr.isOverwrite());
-    insertNode.setSubQuery(subQuery);
-
-    if (expr.hasTableName()) { // INSERT (OVERWRITE) INTO TABLE ...
-      return buildInsertIntoTablePlan(context, insertNode, expr);
-    } else if (expr.hasLocation()) { // INSERT (OVERWRITE) INTO LOCATION ...
-      return buildInsertIntoLocationPlan(context, insertNode, expr);
-    } else {
-      throw new IllegalStateException("Invalid Query");
-    }
-  }
-
-  /**
-   * Builds a InsertNode with a target table.
-   *
-   * ex) INSERT OVERWRITE INTO TABLE ...
-   * <br />
-   *
-   * We use the following terms, such target table, target column
-   * <pre>
-   * INSERT INTO    [DATABASE_NAME.]TB_NAME        (col1, col2)          SELECT    c1,   c2        FROM ...
-   *                 ^^^^^^^^^^^^^^ ^^^^^^^        ^^^^^^^^^^^^                  ^^^^^^^^^^^^
-   *               target database target table  target columns (or schema)     projected columns (or schema)
-   * </pre>
-   */
-  private InsertNode buildInsertIntoTablePlan(PlanContext context, InsertNode insertNode, Insert expr)
-      throws PlanningException {
-    // Get and set a target table
-    String databaseName;
-    String tableName;
-    if (CatalogUtil.isFQTableName(expr.getTableName())) {
-      databaseName = CatalogUtil.extractQualifier(expr.getTableName());
-      tableName = CatalogUtil.extractSimpleName(expr.getTableName());
-    } else {
-      databaseName = context.queryContext.getCurrentDatabase();
-      tableName = expr.getTableName();
-    }
-    TableDesc desc = catalog.getTableDesc(databaseName, tableName);
-    insertNode.setTargetTable(desc);
-
-    //
-    // When we use 'INSERT (OVERWIRTE) INTO TABLE statements, there are two cases.
-    //
-    // First, when a user specified target columns
-    // INSERT (OVERWRITE)? INTO table_name (col1 type, col2 type) SELECT ...
-    //
-    // Second, when a user do not specified target columns
-    // INSERT (OVERWRITE)? INTO table_name SELECT ...
-    //
-    // In the former case is, target columns' schema and corresponding projected columns' schema
-    // must be equivalent or be available to cast implicitly.
-    //
-    // In the later case, the target table's schema and projected column's
-    // schema of select clause can be different to each other. In this case,
-    // we use only a sequence of preceding columns of target table's schema
-    // as target columns.
-    //
-    // For example, consider a target table and an 'insert into' query are give as follows:
-    //
-    // CREATE TABLE TB1                  (col1 int,  col2 int, col3 long);
-    //                                      ||          ||
-    // INSERT OVERWRITE INTO TB1 SELECT  order_key,  part_num               FROM ...
-    //
-    // In this example, only col1 and col2 are used as target columns.
-
-    if (expr.hasTargetColumns()) { // when a user specified target columns
-
-      if (expr.getTargetColumns().length > insertNode.getChild().getOutSchema().size()) {
-        throw new PlanningException("Target columns and projected columns are mismatched to each other");
-      }
-
-      // See PreLogicalPlanVerifier.visitInsert.
-      // It guarantees that the equivalence between the numbers of target and projected columns.
-      String [] targets = expr.getTargetColumns();
-      Schema targetColumns = new Schema();
-      for (int i = 0; i < targets.length; i++) {
-        Column targetColumn = desc.getLogicalSchema().getColumn(targets[i]);
-        targetColumns.addColumn(targetColumn);
-      }
-      insertNode.setTargetSchema(targetColumns);
-      insertNode.setOutSchema(targetColumns);
-      buildProjectedInsert(context, insertNode);
-
-    } else { // when a user do not specified target columns
-
-      // The output schema of select clause determines the target columns.
-      Schema tableSchema = desc.getLogicalSchema();
-      Schema projectedSchema = insertNode.getChild().getOutSchema();
-
-      Schema targetColumns = new Schema();
-      for (int i = 0; i < projectedSchema.size(); i++) {
-        targetColumns.addColumn(tableSchema.getColumn(i));
-      }
-      insertNode.setTargetSchema(targetColumns);
-      buildProjectedInsert(context, insertNode);
-    }
-
-    if (desc.hasPartition()) {
-      insertNode.setPartitionMethod(desc.getPartitionMethod());
-    }
-    return insertNode;
-  }
-
-  private void buildProjectedInsert(PlanContext context, InsertNode insertNode) {
-    Schema tableSchema = insertNode.getTableSchema();
-    Schema targetColumns = insertNode.getTargetSchema();
-
-    LogicalNode child = insertNode.getChild();
-
-    if (child.getType() == NodeType.UNION) {
-      child = makeProjectionForInsertUnion(context, insertNode);
-    }
-
-    if (child instanceof Projectable) {
-      Projectable projectionNode = (Projectable) insertNode.getChild();
-
-      // Modifying projected columns by adding NULL constants
-      // It is because that table appender does not support target columns to be written.
-      List<Target> targets = TUtil.newList();
-      for (int i = 0, j = 0; i < tableSchema.size(); i++) {
-        Column column = tableSchema.getColumn(i);
-
-        if(targetColumns.contains(column) && j < projectionNode.getTargets().length) {
-          targets.add(projectionNode.getTargets()[j++]);
-        } else {
-          targets.add(new Target(new ConstEval(NullDatum.get()), column.getSimpleName()));
-        }
-      }
-      projectionNode.setTargets(targets.toArray(new Target[targets.size()]));
-
-      insertNode.setInSchema(projectionNode.getOutSchema());
-      insertNode.setOutSchema(projectionNode.getOutSchema());
-      insertNode.setProjectedSchema(PlannerUtil.targetToSchema(targets));
-    } else {
-      throw new RuntimeException("Wrong child node type: " +  child.getType() + " for insert");
-    }
-  }
-
-  private ProjectionNode makeProjectionForInsertUnion(PlanContext context, InsertNode insertNode) {
-    LogicalNode child = insertNode.getChild();
-    // add (projection - subquery) to RootBlock and create new QueryBlock for UnionNode
-    TableSubQueryNode subQueryNode = context.plan.createNode(TableSubQueryNode.class);
-    subQueryNode.init(context.queryBlock.getName(), child);
-    subQueryNode.setTargets(PlannerUtil.schemaToTargets(subQueryNode.getOutSchema()));
-
-    ProjectionNode projectionNode = context.plan.createNode(ProjectionNode.class);
-    projectionNode.setChild(subQueryNode);
-    projectionNode.setInSchema(subQueryNode.getInSchema());
-    projectionNode.setTargets(subQueryNode.getTargets());
-
-    context.queryBlock.registerNode(projectionNode);
-    context.queryBlock.registerNode(subQueryNode);
-
-    // add child QueryBlock to the UnionNode's QueryBlock
-    UnionNode unionNode = (UnionNode)child;
-    context.queryBlock.unregisterNode(unionNode);
-
-    QueryBlock unionBlock = context.plan.newQueryBlock();
-    unionBlock.registerNode(unionNode);
-    unionBlock.setRoot(unionNode);
-
-    QueryBlock leftBlock = context.plan.getBlock(unionNode.getLeftChild());
-    QueryBlock rightBlock = context.plan.getBlock(unionNode.getRightChild());
-
-    context.plan.disconnectBlocks(leftBlock, context.queryBlock);
-    context.plan.disconnectBlocks(rightBlock, context.queryBlock);
-
-    context.plan.connectBlocks(unionBlock, context.queryBlock, BlockType.TableSubQuery);
-    context.plan.connectBlocks(leftBlock, unionBlock, BlockType.TableSubQuery);
-    context.plan.connectBlocks(rightBlock, unionBlock, BlockType.TableSubQuery);
-
-    // set InsertNode's child with ProjectionNode which is created.
-    insertNode.setChild(projectionNode);
-
-    return projectionNode;
-  }
-
-  /**
-   * Build a InsertNode with a location.
-   *
-   * ex) INSERT OVERWRITE INTO LOCATION 'hdfs://....' ..
-   */
-  private InsertNode buildInsertIntoLocationPlan(PlanContext context, InsertNode insertNode, Insert expr) {
-    // INSERT (OVERWRITE)? INTO LOCATION path (USING file_type (param_clause)?)? query_expression
-
-    LogicalNode child = insertNode.getChild();
-
-    if (child.getType() == NodeType.UNION) {
-      child = makeProjectionForInsertUnion(context, insertNode);
-    }
-
-    Schema childSchema = child.getOutSchema();
-    insertNode.setInSchema(childSchema);
-    insertNode.setOutSchema(childSchema);
-    insertNode.setTableSchema(childSchema);
-    insertNode.setTargetLocation(new Path(expr.getLocation()));
-
-    if (expr.hasStorageType()) {
-      insertNode.setStorageType(CatalogUtil.getStoreType(expr.getStorageType()));
-    }
-    if (expr.hasParams()) {
-      KeyValueSet options = new KeyValueSet();
-      options.putAll(expr.getParams());
-      insertNode.setOptions(options);
-    }
-    return insertNode;
-  }
-
-  /*===============================================================================================
-    Data Definition Language (DDL) SECTION
-   ===============================================================================================*/
-
-  @Override
-  public LogicalNode visitCreateDatabase(PlanContext context, Stack<Expr> stack, CreateDatabase expr)
-      throws PlanningException {
-    CreateDatabaseNode createDatabaseNode = context.queryBlock.getNodeFromExpr(expr);
-    createDatabaseNode.init(expr.getDatabaseName(), expr.isIfNotExists());
-    return createDatabaseNode;
-  }
-
-  @Override
-  public LogicalNode visitDropDatabase(PlanContext context, Stack<Expr> stack, DropDatabase expr)
-      throws PlanningException {
-    DropDatabaseNode dropDatabaseNode = context.queryBlock.getNodeFromExpr(expr);
-    dropDatabaseNode.init(expr.getDatabaseName(), expr.isIfExists());
-    return dropDatabaseNode;
-  }
-
-  public LogicalNode handleCreateTableLike(PlanContext context, CreateTable expr, CreateTableNode createTableNode)
-    throws PlanningException {
-    String parentTableName = expr.getLikeParentTableName();
-
-    if (CatalogUtil.isFQTableName(parentTableName) == false) {
-      parentTableName =
-	CatalogUtil.buildFQName(context.queryContext.getCurrentDatabase(),
-				parentTableName);
-    }
-    TableDesc parentTableDesc = catalog.getTableDesc(parentTableName);
-    if(parentTableDesc == null)
-      throw new PlanningException("Table '"+parentTableName+"' does not exist");
-    PartitionMethodDesc partitionDesc = parentTableDesc.getPartitionMethod();
-    createTableNode.setTableSchema(parentTableDesc.getSchema());
-    createTableNode.setPartitionMethod(partitionDesc);
-
-    createTableNode.setStorageType(parentTableDesc.getMeta().getStoreType());
-    createTableNode.setOptions(parentTableDesc.getMeta().getOptions());
-
-    createTableNode.setExternal(parentTableDesc.isExternal());
-    if(parentTableDesc.isExternal()) {
-      createTableNode.setPath(parentTableDesc.getPath());
-    }
-    return createTableNode;
-  }
-
-
-  @Override
-  public LogicalNode visitCreateTable(PlanContext context, Stack<Expr> stack, CreateTable expr)
-      throws PlanningException {
-
-    CreateTableNode createTableNode = context.queryBlock.getNodeFromExpr(expr);
-    createTableNode.setIfNotExists(expr.isIfNotExists());
-
-    // Set a table name to be created.
-    if (CatalogUtil.isFQTableName(expr.getTableName())) {
-      createTableNode.setTableName(expr.getTableName());
-    } else {
-      createTableNode.setTableName(
-          CatalogUtil.buildFQName(context.queryContext.getCurrentDatabase(), expr.getTableName()));
-    }
-    // This is CREATE TABLE <tablename> LIKE <parentTable>
-    if(expr.getLikeParentTableName() != null)
-      return handleCreateTableLike(context, expr, createTableNode);
-
-    if (expr.hasStorageType()) { // If storage type (using clause) is specified
-      createTableNode.setStorageType(CatalogUtil.getStoreType(expr.getStorageType()));
-    } else { // otherwise, default type
-      createTableNode.setStorageType(CatalogProtos.StoreType.CSV);
-    }
-
-    // Set default storage properties to be created.
-    KeyValueSet keyValueSet = StorageUtil.newPhysicalProperties(createTableNode.getStorageType());
-    if (expr.hasParams()) {
-      keyValueSet.putAll(expr.getParams());
-    }
-
-    createTableNode.setOptions(keyValueSet);
-
-    if (expr.hasPartition()) {
-      if (expr.getPartitionMethod().getPartitionType().equals(PartitionType.COLUMN)) {
-        createTableNode.setPartitionMethod(getPartitionMethod(context, expr.getTableName(), expr.getPartitionMethod()));
-      } else {
-        throw new PlanningException(String.format("Not supported PartitonType: %s",
-            expr.getPartitionMethod().getPartitionType()));
-      }
-    }
-
-    if (expr.hasSubQuery()) { // CREATE TABLE .. AS SELECT
-      stack.add(expr);
-      LogicalNode subQuery = visit(context, stack, expr.getSubQuery());
-      stack.pop();
-      createTableNode.setChild(subQuery);
-      createTableNode.setInSchema(subQuery.getOutSchema());
-
-      // If the table schema is defined
-      // ex) CREATE TABLE tbl(col1 type, col2 type) AS SELECT ...
-      if (expr.hasTableElements()) {
-        createTableNode.setOutSchema(convertTableElementsSchema(expr.getTableElements()));
-        createTableNode.setTableSchema(convertTableElementsSchema(expr.getTableElements()));
-      } else {
-        // if no table definition, the select clause's output schema will be used.
-        // ex) CREATE TABLE tbl AS SELECT ...
-
-        if (expr.hasPartition()) {
-          PartitionMethodDesc partitionMethod = createTableNode.getPartitionMethod();
-
-          Schema queryOutputSchema = subQuery.getOutSchema();
-          Schema partitionExpressionSchema = partitionMethod.getExpressionSchema();
-          if (partitionMethod.getPartitionType() == CatalogProtos.PartitionType.COLUMN &&
-              queryOutputSchema.size() < partitionExpressionSchema.size()) {
-            throw new VerifyException("Partition columns cannot be more than table columns.");
-          }
-          Schema tableSchema = new Schema();
-          for (int i = 0; i < queryOutputSchema.size() - partitionExpressionSchema.size(); i++) {
-            tableSchema.addColumn(queryOutputSchema.getColumn(i));
-          }
-          createTableNode.setOutSchema(tableSchema);
-          createTableNode.setTableSchema(tableSchema);
-        } else {
-          // Convert the schema of subquery into the target table's one.
-          Schema schema = new Schema(subQuery.getOutSchema());
-          schema.setQualifier(createTableNode.getTableName());
-          createTableNode.setOutSchema(schema);
-          createTableNode.setTableSchema(schema);
-        }
-      }
-
-      return createTableNode;
-
-    } else { // if CREATE AN EMPTY TABLE
-      Schema tableSchema = convertColumnsToSchema(expr.getTableElements());
-      createTableNode.setTableSchema(tableSchema);
-
-      if (expr.isExternal()) {
-        createTableNode.setExternal(true);
-      }
-
-      if (expr.hasLocation()) {
-        createTableNode.setPath(new Path(expr.getLocation()));
-      }
-
-      return createTableNode;
-    }
-  }
-
-  private PartitionMethodDesc getPartitionMethod(PlanContext context,
-                                                 String tableName,
-                                                 CreateTable.PartitionMethodDescExpr expr) throws PlanningException {
-    PartitionMethodDesc partitionMethodDesc;
-
-    if(expr.getPartitionType() == PartitionType.COLUMN) {
-      CreateTable.ColumnPartition partition = (CreateTable.ColumnPartition) expr;
-      String partitionExpression = Joiner.on(',').join(partition.getColumns());
-
-      partitionMethodDesc = new PartitionMethodDesc(context.queryContext.getCurrentDatabase(), tableName,
-          CatalogProtos.PartitionType.COLUMN, partitionExpression, convertColumnsToSchema(partition.getColumns()));
-    } else {
-      throw new PlanningException(String.format("Not supported PartitonType: %s", expr.getPartitionType()));
-    }
-    return partitionMethodDesc;
-  }
-
-  /**
-   * It transforms table definition elements to schema.
-   *
-   * @param elements to be transformed
-   * @return schema transformed from table definition elements
-   */
-  private Schema convertColumnsToSchema(ColumnDefinition[] elements) {
-    Schema schema = new Schema();
-
-    for (ColumnDefinition columnDefinition: elements) {
-      schema.addColumn(convertColumn(columnDefinition));
-    }
-
-    return schema;
-  }
-
-  /**
-   * It transforms table definition elements to schema.
-   *
-   * @param elements to be transformed
-   * @return schema transformed from table definition elements
-   */
-  private Schema convertTableElementsSchema(ColumnDefinition[] elements) {
-    Schema schema = new Schema();
-
-    for (ColumnDefinition columnDefinition: elements) {
-      schema.addColumn(convertColumn(columnDefinition));
-    }
-
-    return schema;
-  }
-
-  private Column convertColumn(ColumnDefinition columnDefinition) {
-    return new Column(columnDefinition.getColumnName(), convertDataType(columnDefinition));
-  }
-
-  public static TajoDataTypes.DataType convertDataType(DataTypeExpr dataType) {
-    TajoDataTypes.Type type = TajoDataTypes.Type.valueOf(dataType.getTypeName());
-
-    TajoDataTypes.DataType.Builder builder = TajoDataTypes.DataType.newBuilder();
-    builder.setType(type);
-    if (dataType.hasLengthOrPrecision()) {
-      builder.setLength(dataType.getLengthOrPrecision());
-    }
-    return builder.build();
-  }
-
-
-  @Override
-  public LogicalNode visitDropTable(PlanContext context, Stack<Expr> stack, DropTable dropTable) {
-    DropTableNode dropTableNode = context.queryBlock.getNodeFromExpr(dropTable);
-    String qualified;
-    if (CatalogUtil.isFQTableName(dropTable.getTableName())) {
-      qualified = dropTable.getTableName();
-    } else {
-      qualified = CatalogUtil.buildFQName(context.queryContext.getCurrentDatabase(), dropTable.getTableName());
-    }
-    dropTableNode.init(qualified, dropTable.isIfExists(), dropTable.isPurge());
-    return dropTableNode;
-  }
-
-  public LogicalNode visitAlterTablespace(PlanContext context, Stack<Expr> stack, AlterTablespace alterTablespace) {
-    AlterTablespaceNode alter = context.queryBlock.getNodeFromExpr(alterTablespace);
-    alter.setTablespaceName(alterTablespace.getTablespaceName());
-    alter.setLocation(alterTablespace.getLocation());
-    return alter;
-  }
-
-  @Override
-  public LogicalNode visitAlterTable(PlanContext context, Stack<Expr> stack, AlterTable alterTable) {
-    AlterTableNode alterTableNode = context.queryBlock.getNodeFromExpr(alterTable);
-    alterTableNode.setTableName(alterTable.getTableName());
-    alterTableNode.setNewTableName(alterTable.getNewTableName());
-    alterTableNode.setColumnName(alterTable.getColumnName());
-    alterTableNode.setNewColumnName(alterTable.getNewColumnName());
-
-    if (null != alterTable.getAddNewColumn()) {
-      alterTableNode.setAddNewColumn(convertColumn(alterTable.getAddNewColumn()));
-    }
-    alterTableNode.setAlterTableOpType(alterTable.getAlterTableOpType());
-    return alterTableNode;
-  }
-
-  @Override
-  public LogicalNode visitTruncateTable(PlanContext context, Stack<Expr> stack, TruncateTable truncateTable)
-      throws PlanningException {
-    TruncateTableNode truncateTableNode = context.queryBlock.getNodeFromExpr(truncateTable);
-    truncateTableNode.setTableNames(truncateTable.getTableNames());
-    return truncateTableNode;
-  }
-
-  /*===============================================================================================
-    Util SECTION
-  ===============================================================================================*/
-
-  public static boolean checkIfBeEvaluatedAtWindowAgg(EvalNode evalNode, WindowAggNode node) {
-    Set<Column> columnRefs = EvalTreeUtil.findUniqueColumns(evalNode);
-
-    if (columnRefs.size() > 0 && !node.getInSchema().containsAll(columnRefs)) {
-      return false;
-    }
-
-    if (EvalTreeUtil.findDistinctAggFunction(evalNode).size() > 0) {
-      return false;
-    }
-
-    return true;
-  }
-
-  public static boolean checkIfBeEvaluatedAtGroupBy(EvalNode evalNode, GroupbyNode node) {
-    Set<Column> columnRefs = EvalTreeUtil.findUniqueColumns(evalNode);
-
-    if (columnRefs.size() > 0 && !node.getInSchema().containsAll(columnRefs)) {
-      return false;
-    }
-
-    if (EvalTreeUtil.findEvalsByType(evalNode, EvalType.WINDOW_FUNCTION).size() > 0) {
-      return false;
-    }
-
-    return true;
-  }
-
-  public static boolean checkIfBeEvaluatedAtJoin(QueryBlock block, EvalNode evalNode, JoinNode node,
-                                                 boolean isTopMostJoin) {
-    Set<Column> columnRefs = EvalTreeUtil.findUniqueColumns(evalNode);
-
-    if (EvalTreeUtil.findDistinctAggFunction(evalNode).size() > 0) {
-      return false;
-    }
-
-    if (EvalTreeUtil.findEvalsByType(evalNode, EvalType.WINDOW_FUNCTION).size() > 0) {
-      return false;
-    }
-
-    if (columnRefs.size() > 0 && !node.getInSchema().containsAll(columnRefs)) {
-      return false;
-    }
-
-    // When a 'case-when' is used with outer join, the case-when expression must be evaluated
-    // at the topmost join operator.
-    // TODO - It's also valid that case-when is evalauted at the topmost outer operator.
-    //        But, how can we know there is no further outer join operator after this node?
-    if (containsOuterJoin(block)) {
-      if (!isTopMostJoin) {
-        Collection<EvalNode> found = EvalTreeUtil.findOuterJoinSensitiveEvals(evalNode);
-        if (found.size() > 0) {
-          return false;
-        }
-      }
-    }
-
-    return true;
-  }
-
-  public static boolean isOuterJoin(JoinType joinType) {
-    return joinType == JoinType.LEFT_OUTER || joinType == JoinType.RIGHT_OUTER || joinType==JoinType.FULL_OUTER;
-  }
-
-  public static boolean containsOuterJoin(QueryBlock block) {
-    return block.containsJoinType(JoinType.LEFT_OUTER) || block.containsJoinType(JoinType.RIGHT_OUTER) ||
-        block.containsJoinType(JoinType.FULL_OUTER);
-  }
-
-  /**
-   * It checks if evalNode can be evaluated at this @{link RelationNode}.
-   */
-  public static boolean checkIfBeEvaluatedAtRelation(QueryBlock block, EvalNode evalNode, RelationNode node) {
-    Set<Column> columnRefs = EvalTreeUtil.findUniqueColumns(evalNode);
-
-    // aggregation functions cannot be evaluated in scan node
-    if (EvalTreeUtil.findDistinctAggFunction(evalNode).size() > 0) {
-      return false;
-    }
-
-    // aggregation functions cannot be evaluated in scan node
-    if (EvalTreeUtil.findEvalsByType(evalNode, EvalType.WINDOW_FUNCTION).size() > 0) {
-      return false;
-    }
-
-    if (columnRefs.size() > 0 && !node.getTableSchema().containsAll(columnRefs)) {
-      return false;
-    }
-
-    // Why? - When a {case when} is used with outer join, case when must be evaluated at topmost outer join.
-    if (containsOuterJoin(block)) {
-      Collection<EvalNode> found = EvalTreeUtil.findOuterJoinSensitiveEvals(evalNode);
-      if (found.size() > 0) {
-        return false;
-      }
-    }
-
-    return true;
-  }
-
-  public static boolean checkIfBeEvaluatedAtThis(EvalNode evalNode, LogicalNode node) {
-    Set<Column> columnRefs = EvalTreeUtil.findUniqueColumns(evalNode);
-    if (columnRefs.size() > 0 && !node.getInSchema().containsAll(columnRefs)) {
-      return false;
-    }
-
-    return true;
-  }
-}


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