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From blrun...@apache.org
Subject git commit: TAJO-741: GreedyHeuristicJoinOrderAlgorithm removes some join pairs. (jaehwa)
Date Fri, 18 Apr 2014 08:04:45 GMT
Repository: tajo
Updated Branches:
  refs/heads/branch-0.8.0 c89d8d6b1 -> d267c7ed9


TAJO-741: GreedyHeuristicJoinOrderAlgorithm removes some join pairs. (jaehwa)


Project: http://git-wip-us.apache.org/repos/asf/tajo/repo
Commit: http://git-wip-us.apache.org/repos/asf/tajo/commit/d267c7ed
Tree: http://git-wip-us.apache.org/repos/asf/tajo/tree/d267c7ed
Diff: http://git-wip-us.apache.org/repos/asf/tajo/diff/d267c7ed

Branch: refs/heads/branch-0.8.0
Commit: d267c7ed9529d73a3a9ddb6fd60931061f5f624a
Parents: c89d8d6
Author: blrunner <jhjung@gruter.com>
Authored: Fri Apr 18 17:04:08 2014 +0900
Committer: blrunner <jhjung@gruter.com>
Committed: Fri Apr 18 17:04:08 2014 +0900

----------------------------------------------------------------------
 CHANGES.txt                                     |   2 +
 .../apache/tajo/engine/eval/EvalTreeUtil.java   |  20 +-
 .../apache/tajo/engine/planner/PlannerUtil.java |  36 +--
 .../join/GreedyHeuristicJoinOrderAlgorithm.java |  11 +-
 .../engine/planner/logical/join/JoinGraph.java  |   2 +-
 .../planner/physical/HashFullOuterJoinExec.java |   5 +-
 .../engine/planner/physical/HashJoinExec.java   |   7 +-
 .../planner/physical/HashLeftOuterJoinExec.java |   4 +-
 .../planner/rewrite/FilterPushDownRule.java     | 210 ++++++++++------
 .../tajo/master/querymaster/QueryUnit.java      |   7 +
 .../tajo/master/querymaster/Repartitioner.java  |   8 +-
 .../tajo/engine/planner/TestLogicalPlanner.java | 251 ++++++++++++++++++-
 .../tajo/engine/planner/TestPlannerUtil.java    |  32 ++-
 .../tajo/engine/query/TestJoinBroadcast.java    |  15 +-
 .../apache/tajo/engine/query/TestJoinQuery.java |  28 +++
 .../testJoinWithMultipleJoinQual1.sql           |  20 ++
 .../testJoinWithMultipleJoinQual2.sql           |   8 +
 .../testJoinWithMultipleJoinQual3.sql           |   9 +
 .../testJoinWithMultipleJoinQual4.sql           |  10 +
 .../testJoinWithMultipleJoinQual1.result        |   2 +
 .../testJoinWithMultipleJoinQual2.result        |   3 +
 .../testJoinWithMultipleJoinQual3.result        |   5 +
 .../testJoinWithMultipleJoinQual4.result        |   4 +
 23 files changed, 565 insertions(+), 134 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/tajo/blob/d267c7ed/CHANGES.txt
----------------------------------------------------------------------
diff --git a/CHANGES.txt b/CHANGES.txt
index 516665e..d421d38 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -325,6 +325,8 @@ Release 0.8.0 - unreleased
 
   BUG FIXES
 
+    TAJO-741: GreedyHeuristicJoinOrderAlgorithm removes some join pairs. (jaehwa)
+
     TAJO-772: TajoDump cannot dump upper/lower mixed case database names.
     (hyunsik)
 

http://git-wip-us.apache.org/repos/asf/tajo/blob/d267c7ed/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/eval/EvalTreeUtil.java
----------------------------------------------------------------------
diff --git a/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/eval/EvalTreeUtil.java b/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/eval/EvalTreeUtil.java
index 0966ee0..7dcc26a 100644
--- a/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/eval/EvalTreeUtil.java
+++ b/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/eval/EvalTreeUtil.java
@@ -193,9 +193,23 @@ public class EvalTreeUtil {
     }    
   }
 
-  public static boolean isJoinQual(EvalNode expr) {
-    return AlgebraicUtil.isComparisonOperator(expr) &&
-        expr.getLeftExpr().getType() == EvalType.FIELD &&
+  /**
+   * If a given expression is join condition, it returns TRUE. Otherwise, it returns FALSE.
+   *
+   * @param expr EvalNode to be evaluated
+   * @param includeThetaJoin If true, it will return equi as well as non-equi join conditions.
+   *                         Otherwise, it only returns equi-join conditions.
+   * @return True if it is join condition.
+   */
+  public static boolean isJoinQual(EvalNode expr, boolean includeThetaJoin) {
+    boolean joinComparator;
+    if (includeThetaJoin) {
+      joinComparator = AlgebraicUtil.isComparisonOperator(expr);
+    } else {
+      joinComparator = expr.getType() == EvalType.EQUAL;
+    }
+
+    return joinComparator && expr.getLeftExpr().getType() == EvalType.FIELD &&
         expr.getRightExpr().getType() == EvalType.FIELD;
   }
   

http://git-wip-us.apache.org/repos/asf/tajo/blob/d267c7ed/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/PlannerUtil.java
----------------------------------------------------------------------
diff --git a/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/PlannerUtil.java b/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/PlannerUtil.java
index 5b43c5b..9f988bd 100644
--- a/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/PlannerUtil.java
+++ b/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/PlannerUtil.java
@@ -530,27 +530,10 @@ public class PlannerUtil {
     return schema;
   }
 
-  /**
-   * is it join qual or not?
-   *
-   * @param qual The condition to be checked
-   * @return true if two operands refers to columns and the operator is comparison,
-   */
-  public static boolean isJoinQual(EvalNode qual) {
-    if (AlgebraicUtil.isComparisonOperator(qual)) {
-      List<Column> left = EvalTreeUtil.findAllColumnRefs(qual.getLeftExpr());
-      List<Column> right = EvalTreeUtil.findAllColumnRefs(qual.getRightExpr());
-
-      if (left.size() == 1 && right.size() == 1 &&
-          !left.get(0).getQualifier().equals(right.get(0).getQualifier()))
-        return true;
-    }
-
-    return false;
-  }
-
   public static SortSpec[][] getSortKeysFromJoinQual(EvalNode joinQual, Schema outer, Schema inner) {
-    List<Column[]> joinKeyPairs = getJoinKeyPairs(joinQual, outer, inner);
+    // It is used for the merge join executor. The merge join only considers the equi-join.
+    // So, theta-join flag must be false.
+    List<Column[]> joinKeyPairs = getJoinKeyPairs(joinQual, outer, inner, false);
     SortSpec[] outerSortSpec = new SortSpec[joinKeyPairs.size()];
     SortSpec[] innerSortSpec = new SortSpec[joinKeyPairs.size()];
 
@@ -574,7 +557,7 @@ public class PlannerUtil {
    * @return the first array contains left table's columns, and the second array contains right table's columns.
    */
   public static Column[][] joinJoinKeyForEachTable(EvalNode joinQual, Schema leftSchema, Schema rightSchema) {
-    List<Column[]> joinKeys = getJoinKeyPairs(joinQual, leftSchema, rightSchema);
+    List<Column[]> joinKeys = getJoinKeyPairs(joinQual, leftSchema, rightSchema, true);
     Column[] leftColumns = new Column[joinKeys.size()];
     Column[] rightColumns = new Column[joinKeys.size()];
     for (int i = 0; i < joinKeys.size(); i++) {
@@ -585,24 +568,27 @@ public class PlannerUtil {
     return new Column[][]{leftColumns, rightColumns};
   }
 
-  public static List<Column[]> getJoinKeyPairs(EvalNode joinQual, Schema leftSchema, Schema rightSchema) {
-    JoinKeyPairFinder finder = new JoinKeyPairFinder(leftSchema, rightSchema);
+  public static List<Column[]> getJoinKeyPairs(EvalNode joinQual, Schema leftSchema, Schema rightSchema,
+                                               boolean includeThetaJoin) {
+    JoinKeyPairFinder finder = new JoinKeyPairFinder(includeThetaJoin, leftSchema, rightSchema);
     joinQual.preOrder(finder);
     return finder.getPairs();
   }
 
   public static class JoinKeyPairFinder implements EvalNodeVisitor {
+    private boolean includeThetaJoin;
     private final List<Column[]> pairs = Lists.newArrayList();
     private Schema[] schemas = new Schema[2];
 
-    public JoinKeyPairFinder(Schema outer, Schema inner) {
+    public JoinKeyPairFinder(boolean includeThetaJoin, Schema outer, Schema inner) {
+      this.includeThetaJoin = includeThetaJoin;
       schemas[0] = outer;
       schemas[1] = inner;
     }
 
     @Override
     public void visit(EvalNode node) {
-      if (EvalTreeUtil.isJoinQual(node)) {
+      if (EvalTreeUtil.isJoinQual(node, includeThetaJoin)) {
         Column[] pair = new Column[2];
 
         for (int i = 0; i <= 1; i++) { // access left, right sub expression

http://git-wip-us.apache.org/repos/asf/tajo/blob/d267c7ed/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/logical/join/GreedyHeuristicJoinOrderAlgorithm.java
----------------------------------------------------------------------
diff --git a/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/logical/join/GreedyHeuristicJoinOrderAlgorithm.java b/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/logical/join/GreedyHeuristicJoinOrderAlgorithm.java
index ffa95fb..f2bcd77 100644
--- a/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/logical/join/GreedyHeuristicJoinOrderAlgorithm.java
+++ b/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/logical/join/GreedyHeuristicJoinOrderAlgorithm.java
@@ -162,7 +162,8 @@ public class GreedyHeuristicJoinOrderAlgorithm implements JoinOrderAlgorithm {
    *
    * @return If there is no join condition between two relation, it returns NULL value.
    */
-  private static JoinEdge findJoin(LogicalPlan plan, JoinGraph graph, LogicalNode outer, LogicalNode inner) throws PlanningException {
+  private static JoinEdge findJoin(LogicalPlan plan, JoinGraph graph, LogicalNode outer, LogicalNode inner)
+      throws PlanningException {
     JoinEdge foundJoinEdge = null;
 
     for (String outerName : PlannerUtil.getRelationLineageWithinQueryBlock(plan, outer)) {
@@ -171,7 +172,13 @@ public class GreedyHeuristicJoinOrderAlgorithm implements JoinOrderAlgorithm {
         // Find all joins between two relations and merge them into one join if possible
         if (graph.hasEdge(outerName, innerName)) {
           JoinEdge existJoinEdge = graph.getEdge(outerName, innerName);
-          foundJoinEdge = new JoinEdge(existJoinEdge.getJoinType(), outer, inner, existJoinEdge.getJoinQual());
+          if (foundJoinEdge == null) {
+            foundJoinEdge = new JoinEdge(existJoinEdge.getJoinType(), outer, inner,
+                existJoinEdge.getJoinQual());
+          } else {
+            foundJoinEdge.addJoinQual(AlgebraicUtil.createSingletonExprFromCNF(
+                existJoinEdge.getJoinQual()));
+          }
         }
       }
     }

http://git-wip-us.apache.org/repos/asf/tajo/blob/d267c7ed/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/logical/join/JoinGraph.java
----------------------------------------------------------------------
diff --git a/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/logical/join/JoinGraph.java b/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/logical/join/JoinGraph.java
index 2da1f4b..77e03ea 100644
--- a/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/logical/join/JoinGraph.java
+++ b/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/logical/join/JoinGraph.java
@@ -80,7 +80,7 @@ public class JoinGraph extends SimpleUndirectedGraph<String, JoinEdge> {
     Set<EvalNode> cnf = Sets.newHashSet(AlgebraicUtil.toConjunctiveNormalFormArray(joinNode.getJoinQual()));
     Set<EvalNode> nonJoinQuals = Sets.newHashSet();
     for (EvalNode singleQual : cnf) {
-      if (PlannerUtil.isJoinQual(singleQual)) {
+      if (EvalTreeUtil.isJoinQual(singleQual, true)) {
 
         String [] relations = guessRelationsFromJoinQual(block, singleQual);
         String leftExprRelName = relations[0];

http://git-wip-us.apache.org/repos/asf/tajo/blob/d267c7ed/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/physical/HashFullOuterJoinExec.java
----------------------------------------------------------------------
diff --git a/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/physical/HashFullOuterJoinExec.java b/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/physical/HashFullOuterJoinExec.java
index dc06bd9..65ebe2f 100644
--- a/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/physical/HashFullOuterJoinExec.java
+++ b/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/physical/HashFullOuterJoinExec.java
@@ -75,8 +75,9 @@ public class HashFullOuterJoinExec extends BinaryPhysicalExec {
     // we have a boolean flag, initially false (whether this join key had at least one match on the left operand)
     this.matched = new HashMap<Tuple, Boolean>(10000);
 
-    this.joinKeyPairs = PlannerUtil.getJoinKeyPairs(joinQual,
-        outer.getSchema(), inner.getSchema());
+    // HashJoin only can manage equi join key pairs.
+    this.joinKeyPairs = PlannerUtil.getJoinKeyPairs(joinQual, outer.getSchema(), inner.getSchema(),
+        false);
 
     leftKeyList = new int[joinKeyPairs.size()];
     rightKeyList = new int[joinKeyPairs.size()];

http://git-wip-us.apache.org/repos/asf/tajo/blob/d267c7ed/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/physical/HashJoinExec.java
----------------------------------------------------------------------
diff --git a/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/physical/HashJoinExec.java b/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/physical/HashJoinExec.java
index 0084031..dea0340 100644
--- a/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/physical/HashJoinExec.java
+++ b/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/physical/HashJoinExec.java
@@ -19,8 +19,6 @@
 package org.apache.tajo.engine.planner.physical;
 
 import org.apache.tajo.catalog.Column;
-import org.apache.tajo.datum.Datum;
-import org.apache.tajo.datum.Int4Datum;
 import org.apache.tajo.engine.eval.EvalNode;
 import org.apache.tajo.engine.planner.PlannerUtil;
 import org.apache.tajo.engine.planner.Projector;
@@ -67,8 +65,9 @@ public class HashJoinExec extends BinaryPhysicalExec {
     this.joinQual = plan.getJoinQual();
     this.tupleSlots = new HashMap<Tuple, List<Tuple>>(100000);
 
-    this.joinKeyPairs = PlannerUtil.getJoinKeyPairs(joinQual,
-        leftExec.getSchema(), rightExec.getSchema());
+    // HashJoin only can manage equi join key pairs.
+    this.joinKeyPairs = PlannerUtil.getJoinKeyPairs(joinQual, leftExec.getSchema(),
+        rightExec.getSchema(), false);
 
     leftKeyList = new int[joinKeyPairs.size()];
     rightKeyList = new int[joinKeyPairs.size()];

http://git-wip-us.apache.org/repos/asf/tajo/blob/d267c7ed/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/physical/HashLeftOuterJoinExec.java
----------------------------------------------------------------------
diff --git a/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/physical/HashLeftOuterJoinExec.java b/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/physical/HashLeftOuterJoinExec.java
index 6d57961..849dc38 100644
--- a/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/physical/HashLeftOuterJoinExec.java
+++ b/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/physical/HashLeftOuterJoinExec.java
@@ -72,7 +72,9 @@ public class HashLeftOuterJoinExec extends BinaryPhysicalExec {
     this.joinQual = plan.getJoinQual();
     this.tupleSlots = new HashMap<Tuple, List<Tuple>>(10000);
 
-    this.joinKeyPairs = PlannerUtil.getJoinKeyPairs(joinQual, leftChild.getSchema(), rightChild.getSchema());
+    // HashJoin only can manage equi join key pairs.
+    this.joinKeyPairs = PlannerUtil.getJoinKeyPairs(joinQual, leftChild.getSchema(),
+        rightChild.getSchema(), false);
 
     leftKeyList = new int[joinKeyPairs.size()];
     rightKeyList = new int[joinKeyPairs.size()];

http://git-wip-us.apache.org/repos/asf/tajo/blob/d267c7ed/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/rewrite/FilterPushDownRule.java
----------------------------------------------------------------------
diff --git a/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/rewrite/FilterPushDownRule.java b/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/rewrite/FilterPushDownRule.java
index f1daec9..63b426f 100644
--- a/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/rewrite/FilterPushDownRule.java
+++ b/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/rewrite/FilterPushDownRule.java
@@ -111,94 +111,94 @@ public class FilterPushDownRule extends BasicLogicalPlanVisitor<Set<EvalNode>, L
     if (joinQual != null && isOuterJoin(joinType)) {
 
       // if both are fields
-       if (joinQual.getLeftExpr().getType() == EvalType.FIELD && joinQual.getRightExpr().getType() == EvalType.FIELD) {
-
-          String leftTableName = ((FieldEval) joinQual.getLeftExpr()).getQualifier();
-          String rightTableName = ((FieldEval) joinQual.getRightExpr()).getQualifier();
-          List<String> nullSuppliers = Lists.newArrayList();
-          Set<String> leftTableSet = Sets.newHashSet(PlannerUtil.getRelationLineageWithinQueryBlock(plan,
-              joinNode.getLeftChild()));
-          Set<String> rightTableSet = Sets.newHashSet(PlannerUtil.getRelationLineageWithinQueryBlock(plan,
-              joinNode.getRightChild()));
-
-          // some verification
-          if (joinType == JoinType.FULL_OUTER) {
-             nullSuppliers.add(leftTableName);
-             nullSuppliers.add(rightTableName);
-
-             // verify that these null suppliers are indeed in the left and right sets
-             if (!rightTableSet.contains(nullSuppliers.get(0)) && !leftTableSet.contains(nullSuppliers.get(0))) {
-                throw new InvalidQueryException("Incorrect Logical Query Plan with regard to outer join");
-             }
-             if (!rightTableSet.contains(nullSuppliers.get(1)) && !leftTableSet.contains(nullSuppliers.get(1))) {
-                throw new InvalidQueryException("Incorrect Logical Query Plan with regard to outer join");
-             }
-
-          } else if (joinType == JoinType.LEFT_OUTER) {
-             nullSuppliers.add(((RelationNode)joinNode.getRightChild()).getCanonicalName());
-             //verify that this null supplier is indeed in the right sub-tree
-             if (!rightTableSet.contains(nullSuppliers.get(0))) {
-                 throw new InvalidQueryException("Incorrect Logical Query Plan with regard to outer join");
-             }
-          } else if (joinType == JoinType.RIGHT_OUTER) {
-            if (((RelationNode)joinNode.getRightChild()).getCanonicalName().equals(rightTableName)) {
-              nullSuppliers.add(leftTableName);
-            } else {
-              nullSuppliers.add(rightTableName);
-            }
+      if (joinQual.getLeftExpr().getType() == EvalType.FIELD && joinQual.getRightExpr().getType() == EvalType.FIELD) {
+
+        String leftTableName = ((FieldEval) joinQual.getLeftExpr()).getQualifier();
+        String rightTableName = ((FieldEval) joinQual.getRightExpr()).getQualifier();
+        List<String> nullSuppliers = Lists.newArrayList();
+        Set<String> leftTableSet = Sets.newHashSet(PlannerUtil.getRelationLineageWithinQueryBlock(plan,
+            joinNode.getLeftChild()));
+        Set<String> rightTableSet = Sets.newHashSet(PlannerUtil.getRelationLineageWithinQueryBlock(plan,
+            joinNode.getRightChild()));
+
+        // some verification
+        if (joinType == JoinType.FULL_OUTER) {
+          nullSuppliers.add(leftTableName);
+          nullSuppliers.add(rightTableName);
+
+          // verify that these null suppliers are indeed in the left and right sets
+          if (!rightTableSet.contains(nullSuppliers.get(0)) && !leftTableSet.contains(nullSuppliers.get(0))) {
+            throw new InvalidQueryException("Incorrect Logical Query Plan with regard to outer join");
+          }
+          if (!rightTableSet.contains(nullSuppliers.get(1)) && !leftTableSet.contains(nullSuppliers.get(1))) {
+            throw new InvalidQueryException("Incorrect Logical Query Plan with regard to outer join");
+          }
 
-            // verify that this null supplier is indeed in the left sub-tree
-            if (!leftTableSet.contains(nullSuppliers.get(0))) {
-              throw new InvalidQueryException("Incorrect Logical Query Plan with regard to outer join");
-            }
+        } else if (joinType == JoinType.LEFT_OUTER) {
+          nullSuppliers.add(((RelationNode)joinNode.getRightChild()).getCanonicalName());
+          //verify that this null supplier is indeed in the right sub-tree
+          if (!rightTableSet.contains(nullSuppliers.get(0))) {
+            throw new InvalidQueryException("Incorrect Logical Query Plan with regard to outer join");
+          }
+        } else if (joinType == JoinType.RIGHT_OUTER) {
+          if (((RelationNode)joinNode.getRightChild()).getCanonicalName().equals(rightTableName)) {
+            nullSuppliers.add(leftTableName);
+          } else {
+            nullSuppliers.add(rightTableName);
           }
 
-         // retain in this outer join node's JoinQual those selection predicates
-         // related to the outer join's null supplier(s)
-         List<EvalNode> matched2 = Lists.newArrayList();
-         for (EvalNode eval : cnf) {
-
-            Set<Column> columnRefs = EvalTreeUtil.findUniqueColumns(eval);
-            Set<String> tableNames = Sets.newHashSet();
-            // getting distinct table references
-            for (Column col : columnRefs) {
-              if (!tableNames.contains(col.getQualifier())) {
-                tableNames.add(col.getQualifier());
-              }
-            }
+          // verify that this null supplier is indeed in the left sub-tree
+          if (!leftTableSet.contains(nullSuppliers.get(0))) {
+            throw new InvalidQueryException("Incorrect Logical Query Plan with regard to outer join");
+          }
+        }
 
-            //if the predicate involves any of the null suppliers
-            boolean shouldKeep=false;
-            Iterator<String> it2 = nullSuppliers.iterator();
-            while(it2.hasNext()){
-              if(tableNames.contains(it2.next()) == true) {
-                   shouldKeep = true;
-              }
+        // retain in this outer join node's JoinQual those selection predicates
+        // related to the outer join's null supplier(s)
+        List<EvalNode> matched2 = Lists.newArrayList();
+        for (EvalNode eval : cnf) {
+
+          Set<Column> columnRefs = EvalTreeUtil.findUniqueColumns(eval);
+          Set<String> tableNames = Sets.newHashSet();
+          // getting distinct table references
+          for (Column col : columnRefs) {
+            if (!tableNames.contains(col.getQualifier())) {
+              tableNames.add(col.getQualifier());
             }
+          }
 
-            if(shouldKeep == true) {
-                matched2.add(eval);
+          //if the predicate involves any of the null suppliers
+          boolean shouldKeep=false;
+          Iterator<String> it2 = nullSuppliers.iterator();
+          while(it2.hasNext()){
+            if(tableNames.contains(it2.next()) == true) {
+              shouldKeep = true;
             }
-
           }
 
-          //merge the retained predicates and establish them in the current outer join node. Then remove them from the cnf
-          EvalNode qual2 = null;
-          if (matched2.size() > 1) {
-             // merged into one eval tree
-             qual2 = AlgebraicUtil.createSingletonExprFromCNF(
-                 matched2.toArray(new EvalNode[matched2.size()]));
-          } else if (matched2.size() == 1) {
-             // if the number of matched expr is one
-             qual2 = matched2.get(0);
+          if(shouldKeep == true) {
+            matched2.add(eval);
           }
 
-          if (qual2 != null) {
-             EvalNode conjQual2 = AlgebraicUtil.createSingletonExprFromCNF(joinNode.getJoinQual(), qual2);
-             joinNode.setJoinQual(conjQual2);
-             cnf.removeAll(matched2);
-          } // for the remaining cnf, push it as usual
-       }
+        }
+
+        //merge the retained predicates and establish them in the current outer join node. Then remove them from the cnf
+        EvalNode qual2 = null;
+        if (matched2.size() > 1) {
+          // merged into one eval tree
+          qual2 = AlgebraicUtil.createSingletonExprFromCNF(
+              matched2.toArray(new EvalNode[matched2.size()]));
+        } else if (matched2.size() == 1) {
+          // if the number of matched expr is one
+          qual2 = matched2.get(0);
+        }
+
+        if (qual2 != null) {
+          EvalNode conjQual2 = AlgebraicUtil.createSingletonExprFromCNF(joinNode.getJoinQual(), qual2);
+          joinNode.setJoinQual(conjQual2);
+          cnf.removeAll(matched2);
+        } // for the remaining cnf, push it as usual
+      }
     }
 
     if (joinNode.hasJoinQual()) {
@@ -238,9 +238,63 @@ public class FilterPushDownRule extends BasicLogicalPlanVisitor<Set<EvalNode>, L
   }
 
   @Override
+  public LogicalNode visitTableSubQuery(Set<EvalNode> cnf, LogicalPlan plan, LogicalPlan.QueryBlock block,
+                                        TableSubQueryNode node, Stack<LogicalNode> stack) throws PlanningException {
+    List<EvalNode> matched = Lists.newArrayList();
+    for (EvalNode eval : cnf) {
+      if (LogicalPlanner.checkIfBeEvaluatedAtRelation(block, eval, node)) {
+        matched.add(eval);
+      }
+    }
+
+    Map<String, String> columnMap = new HashMap<String, String>();
+    for (int i = 0; i < node.getInSchema().size(); i++) {
+      LogicalNode childNode = node.getSubQuery();
+      if (childNode.getOutSchema().getColumn(i).hasQualifier()) {
+      columnMap.put(node.getInSchema().getColumn(i).getQualifiedName(),
+          childNode.getOutSchema().getColumn(i).getQualifiedName());
+      } else {
+        NamedExprsManager namedExprsMgr = plan.getBlock(node.getSubQuery()).getNamedExprsManager();
+        columnMap.put(node.getInSchema().getColumn(i).getQualifiedName(),
+          namedExprsMgr.getOriginalName(childNode.getOutSchema().getColumn(i).getQualifiedName()));
+      }
+    }
+
+    Set<EvalNode> transformed = new HashSet<EvalNode>();
+
+    // Rename from upper block's one to lower block's one
+    for (EvalNode matchedEval : matched) {
+      EvalNode copy;
+      try {
+        copy = (EvalNode) matchedEval.clone();
+      } catch (CloneNotSupportedException e) {
+        throw new PlanningException(e);
+      }
+
+      Set<Column> columns = EvalTreeUtil.findUniqueColumns(copy);
+      for (Column c : columns) {
+        if (columnMap.containsKey(c.getQualifiedName())) {
+          EvalTreeUtil.changeColumnRef(copy, c.getQualifiedName(), columnMap.get(c.getQualifiedName()));
+        } else {
+          throw new PlanningException(
+              "Invalid Filter PushDown on SubQuery: No such a corresponding column '"
+                  + c.getQualifiedName());
+        }
+      }
+
+      transformed.add(copy);
+    }
+
+    visit(transformed, plan, plan.getBlock(node.getSubQuery()));
+
+    cnf.removeAll(matched);
+
+    return node;
+  }
+
+  @Override
   public LogicalNode visitScan(Set<EvalNode> cnf, LogicalPlan plan, LogicalPlan.QueryBlock block, ScanNode scanNode,
                                Stack<LogicalNode> stack) throws PlanningException {
-
     List<EvalNode> matched = Lists.newArrayList();
     for (EvalNode eval : cnf) {
       if (LogicalPlanner.checkIfBeEvaluatedAtRelation(block, eval, scanNode)) {

http://git-wip-us.apache.org/repos/asf/tajo/blob/d267c7ed/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/master/querymaster/QueryUnit.java
----------------------------------------------------------------------
diff --git a/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/master/querymaster/QueryUnit.java b/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/master/querymaster/QueryUnit.java
index d0fde4f..42fbf8a 100644
--- a/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/master/querymaster/QueryUnit.java
+++ b/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/master/querymaster/QueryUnit.java
@@ -19,6 +19,7 @@
 package org.apache.tajo.master.querymaster;
 
 import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Objects;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
@@ -647,5 +648,11 @@ public class QueryUnit implements EventHandler<TaskEvent> {
     public String getPullAddress() {
       return pullHost + ":" + port;
     }
+
+    @Override
+    public int hashCode() {
+      return Objects.hashCode(taskId, attemptId, partId, pullHost, port);
+    }
+
   }
 }

http://git-wip-us.apache.org/repos/asf/tajo/blob/d267c7ed/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/master/querymaster/Repartitioner.java
----------------------------------------------------------------------
diff --git a/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/master/querymaster/Repartitioner.java b/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/master/querymaster/Repartitioner.java
index 6704230..31d433d 100644
--- a/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/master/querymaster/Repartitioner.java
+++ b/tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/master/querymaster/Repartitioner.java
@@ -114,8 +114,6 @@ public class Repartitioner {
       }
     }
 
-    //LOG.info(String.format("Left Volume: %d, Right Volume: %d", stats[0], stats[1]));
-
     // If one of inner join tables has no input data,
     // it should return zero rows.
     JoinNode joinNode = PlannerUtil.findMostBottomNode(execBlock.getPlan(), NodeType.JOIN);
@@ -180,7 +178,11 @@ public class Repartitioner {
             int emptyPartitionId = 0;
             if (hashEntries.containsKey(emptyPartitionId)) {
               Map<String, List<IntermediateEntry>> tbNameToInterm = hashEntries.get(emptyPartitionId);
-              tbNameToInterm.put(scan.getCanonicalName(), new ArrayList<IntermediateEntry>());
+              if (tbNameToInterm.containsKey(scan.getCanonicalName()))
+                tbNameToInterm.get(scan.getCanonicalName())
+                    .addAll(new ArrayList<IntermediateEntry>());
+              else
+                tbNameToInterm.put(scan.getCanonicalName(), new ArrayList<IntermediateEntry>());
             } else {
               Map<String, List<IntermediateEntry>> tbNameToInterm = new HashMap<String, List<IntermediateEntry>>();
               tbNameToInterm.put(scan.getCanonicalName(), new ArrayList<IntermediateEntry>());

http://git-wip-us.apache.org/repos/asf/tajo/blob/d267c7ed/tajo-core/tajo-core-backend/src/test/java/org/apache/tajo/engine/planner/TestLogicalPlanner.java
----------------------------------------------------------------------
diff --git a/tajo-core/tajo-core-backend/src/test/java/org/apache/tajo/engine/planner/TestLogicalPlanner.java b/tajo-core/tajo-core-backend/src/test/java/org/apache/tajo/engine/planner/TestLogicalPlanner.java
index 6dda611..b586f56 100644
--- a/tajo-core/tajo-core-backend/src/test/java/org/apache/tajo/engine/planner/TestLogicalPlanner.java
+++ b/tajo-core/tajo-core-backend/src/test/java/org/apache/tajo/engine/planner/TestLogicalPlanner.java
@@ -18,6 +18,7 @@
 
 package org.apache.tajo.engine.planner;
 
+import com.google.common.base.Preconditions;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Sets;
 import org.apache.tajo.LocalTajoTestingUtility;
@@ -30,7 +31,8 @@ import org.apache.tajo.catalog.*;
 import org.apache.tajo.catalog.proto.CatalogProtos.FunctionType;
 import org.apache.tajo.catalog.proto.CatalogProtos.StoreType;
 import org.apache.tajo.common.TajoDataTypes.Type;
-import org.apache.tajo.engine.eval.EvalType;
+import org.apache.tajo.datum.TextDatum;
+import org.apache.tajo.engine.eval.*;
 import org.apache.tajo.engine.function.builtin.SumInt;
 import org.apache.tajo.engine.json.CoreGsonHelper;
 import org.apache.tajo.engine.parser.SQLAnalyzer;
@@ -39,6 +41,7 @@ import org.apache.tajo.master.TajoMaster;
 import org.apache.tajo.master.session.Session;
 import org.apache.tajo.util.CommonTestingUtil;
 import org.apache.tajo.util.FileUtil;
+import org.apache.tajo.util.TUtil;
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
 import org.junit.Test;
@@ -50,6 +53,7 @@ import java.util.*;
 import static org.apache.tajo.TajoConstants.DEFAULT_DATABASE_NAME;
 import static org.apache.tajo.TajoConstants.DEFAULT_TABLESPACE_NAME;
 import static org.junit.Assert.*;
+import static org.junit.Assert.assertEquals;
 
 public class TestLogicalPlanner {
   private static TajoTestingCluster util;
@@ -412,6 +416,251 @@ public class TestLogicalPlanner {
     assertSchema(expected, plan.getOutSchema());
   }
 
+  private final void findJoinQual(EvalNode evalNode, Map<BinaryEval, Boolean> qualMap,
+                                  EvalType leftType, EvalType rightType)
+      throws IOException, PlanningException {
+    Preconditions.checkArgument(evalNode instanceof BinaryEval);
+    BinaryEval qual = (BinaryEval)evalNode;
+
+    if (qual.getLeftExpr().getType() == leftType && qual.getRightExpr().getType() == rightType) {
+      assertEquals(qual.getLeftExpr().getType(), EvalType.FIELD);
+      FieldEval leftField = (FieldEval)qual.getLeftExpr();
+
+      for (Map.Entry<BinaryEval, Boolean> entry : qualMap.entrySet()) {
+        FieldEval leftJoinField = (FieldEval)entry.getKey().getLeftExpr();
+
+        if (qual.getRightExpr().getType() == entry.getKey().getRightExpr().getType()) {
+          if (rightType == EvalType.FIELD) {
+            FieldEval rightField = (FieldEval)qual.getRightExpr();
+            FieldEval rightJoinField = (FieldEval)entry.getKey().getRightExpr();
+
+            if (leftJoinField.getColumnRef().getQualifiedName().equals(leftField.getColumnRef().getQualifiedName())
+                && rightField.getColumnRef().getQualifiedName().equals(rightJoinField.getColumnRef().getQualifiedName())) {
+              qualMap.put(entry.getKey(), Boolean.TRUE);
+            }
+          } else if (rightType == EvalType.CONST) {
+            ConstEval rightField = (ConstEval)qual.getRightExpr();
+            ConstEval rightJoinField = (ConstEval)entry.getKey().getRightExpr();
+
+            if (leftJoinField.getColumnRef().getQualifiedName().equals(leftField.getColumnRef().getQualifiedName()) &&
+                rightField.getValue().equals(rightJoinField.getValue())) {
+              qualMap.put(entry.getKey(), Boolean.TRUE);
+            }
+          } else if (rightType == EvalType.ROW_CONSTANT) {
+            RowConstantEval rightField = (RowConstantEval)qual.getRightExpr();
+            RowConstantEval rightJoinField = (RowConstantEval)entry.getKey().getRightExpr();
+
+            if (leftJoinField.getColumnRef().getQualifiedName().equals(leftField.getColumnRef().getQualifiedName())) {
+              assertEquals(rightField.getValues().length, rightJoinField.getValues().length);
+              for (int i = 0; i < rightField.getValues().length; i++) {
+                assertEquals(rightField.getValues()[i], rightJoinField.getValues()[i]);
+              }
+              qualMap.put(entry.getKey(), Boolean.TRUE);
+            }
+          }
+        }
+      }
+    }
+  }
+
+  @Test
+  public final void testJoinWithMultipleJoinQual1() throws IOException, PlanningException {
+    Expr expr = sqlAnalyzer.parse(
+        FileUtil.readTextFile(new File
+            ("src/test/resources/queries/TestJoinQuery/testJoinWithMultipleJoinQual1.sql")));
+
+    LogicalPlan plan = planner.createPlan(LocalTajoTestingUtility.createDummySession(),expr);
+    LogicalNode node = plan.getRootBlock().getRoot();
+    testJsonSerDerObject(node);
+
+    Schema expected = tpch.getOutSchema("q2");
+    assertSchema(expected, node.getOutSchema());
+
+    LogicalOptimizer optimizer = new LogicalOptimizer(util.getConfiguration());
+    optimizer.optimize(plan);
+
+    LogicalNode[] nodes = PlannerUtil.findAllNodes(node, NodeType.JOIN);
+    Map<BinaryEval, Boolean> qualMap = TUtil.newHashMap();
+    BinaryEval joinQual = new BinaryEval(EvalType.EQUAL
+        , new FieldEval(new Column("default.n.n_regionkey", Type.INT4))
+        , new FieldEval(new Column("default.ps.ps_suppkey", Type.INT4))
+        );
+    qualMap.put(joinQual, Boolean.FALSE);
+
+    for(LogicalNode eachNode : nodes) {
+      JoinNode joinNode = (JoinNode)eachNode;
+      EvalNode[] evalNodes = AlgebraicUtil.toConjunctiveNormalFormArray(joinNode.getJoinQual());
+
+      for(EvalNode evalNode : evalNodes) {
+        findJoinQual(evalNode, qualMap, EvalType.FIELD, EvalType.FIELD);
+      }
+    }
+
+    for (Map.Entry<BinaryEval, Boolean> entry : qualMap.entrySet()) {
+      if (!entry.getValue().booleanValue()) {
+        Preconditions.checkArgument(false,
+            "JoinQual not found. -> required JoinQual:" + entry.getKey().toJson());
+      }
+    }
+  }
+
+  @Test
+  public final void testJoinWithMultipleJoinQual2() throws IOException, PlanningException {
+    Expr expr = sqlAnalyzer.parse(
+        FileUtil.readTextFile(new File
+            ("src/test/resources/queries/TestJoinQuery/testJoinWithMultipleJoinQual2.sql")));
+
+    LogicalPlan plan = planner.createPlan(LocalTajoTestingUtility.createDummySession(),expr);
+    LogicalNode node = plan.getRootBlock().getRoot();
+    testJsonSerDerObject(node);
+
+    LogicalOptimizer optimizer = new LogicalOptimizer(util.getConfiguration());
+    optimizer.optimize(plan);
+
+    LogicalNode[] nodes = PlannerUtil.findAllNodes(node, NodeType.SCAN);
+    Map<BinaryEval, Boolean> qualMap = TUtil.newHashMap();
+    BinaryEval joinQual = new BinaryEval(EvalType.EQUAL
+        , new FieldEval(new Column("default.n.n_name", Type.TEXT))
+        , new ConstEval(new TextDatum("MOROCCO"))
+    );
+    qualMap.put(joinQual, Boolean.FALSE);
+
+    for(LogicalNode eachNode : nodes) {
+      ScanNode scanNode = (ScanNode)eachNode;
+      if (scanNode.hasQual()) {
+        EvalNode[] evalNodes = AlgebraicUtil.toConjunctiveNormalFormArray(scanNode.getQual());
+
+        for(EvalNode evalNode : evalNodes) {
+          findJoinQual(evalNode, qualMap, EvalType.FIELD, EvalType.CONST);
+        }
+      }
+    }
+
+    for (Map.Entry<BinaryEval, Boolean> entry : qualMap.entrySet()) {
+      if (!entry.getValue().booleanValue()) {
+        Preconditions.checkArgument(false,
+            "SelectionQual not found. -> required JoinQual:" + entry.getKey().toJson());
+      }
+    }
+  }
+
+  @Test
+  public final void testJoinWithMultipleJoinQual3() throws IOException, PlanningException {
+    Expr expr = sqlAnalyzer.parse(
+        FileUtil.readTextFile(new File
+            ("src/test/resources/queries/TestJoinQuery/testJoinWithMultipleJoinQual3.sql")));
+
+    LogicalPlan plan = planner.createPlan(LocalTajoTestingUtility.createDummySession(),expr);
+    LogicalNode node = plan.getRootBlock().getRoot();
+    testJsonSerDerObject(node);
+
+    LogicalOptimizer optimizer = new LogicalOptimizer(util.getConfiguration());
+    optimizer.optimize(plan);
+
+    LogicalNode[] nodes = PlannerUtil.findAllNodes(node, NodeType.SCAN);
+    Map<BinaryEval, Boolean> qualMap = TUtil.newHashMap();
+    TextDatum[] datums = new TextDatum[3];
+    datums[0] = new TextDatum("ARGENTINA");
+    datums[1] = new TextDatum("ETHIOPIA");
+    datums[2] = new TextDatum("MOROCCO");
+
+    BinaryEval joinQual = new BinaryEval(EvalType.EQUAL
+        , new FieldEval(new Column("default.n.n_name", Type.TEXT))
+        , new RowConstantEval(datums)
+    );
+    qualMap.put(joinQual, Boolean.FALSE);
+
+    for(LogicalNode eachNode : nodes) {
+      ScanNode scanNode = (ScanNode)eachNode;
+      if (scanNode.hasQual()) {
+        EvalNode[] evalNodes = AlgebraicUtil.toConjunctiveNormalFormArray(scanNode.getQual());
+
+        for(EvalNode evalNode : evalNodes) {
+          findJoinQual(evalNode, qualMap, EvalType.FIELD, EvalType.ROW_CONSTANT);
+        }
+      }
+    }
+
+    for (Map.Entry<BinaryEval, Boolean> entry : qualMap.entrySet()) {
+      if (!entry.getValue().booleanValue()) {
+        Preconditions.checkArgument(false,
+            "ScanQual not found. -> required JoinQual:" + entry.getKey().toJson());
+      }
+    }
+  }
+
+
+  @Test
+  public final void testJoinWithMultipleJoinQual4() throws IOException, PlanningException {
+    Expr expr = sqlAnalyzer.parse(
+        FileUtil.readTextFile(new File
+            ("src/test/resources/queries/TestJoinQuery/testJoinWithMultipleJoinQual4.sql")));
+
+    LogicalPlan plan = planner.createPlan(LocalTajoTestingUtility.createDummySession(),expr);
+    LogicalNode node = plan.getRootBlock().getRoot();
+    testJsonSerDerObject(node);
+
+    LogicalOptimizer optimizer = new LogicalOptimizer(util.getConfiguration());
+    optimizer.optimize(plan);
+
+    Map<BinaryEval, Boolean> scanMap = TUtil.newHashMap();
+    TextDatum[] datums = new TextDatum[3];
+    datums[0] = new TextDatum("ARGENTINA");
+    datums[1] = new TextDatum("ETHIOPIA");
+    datums[2] = new TextDatum("MOROCCO");
+
+    BinaryEval scanQual = new BinaryEval(EvalType.EQUAL
+        , new FieldEval(new Column("default.n.n_name", Type.TEXT))
+        , new RowConstantEval(datums)
+    );
+    scanMap.put(scanQual, Boolean.FALSE);
+
+    Map<BinaryEval, Boolean> joinQualMap = TUtil.newHashMap();
+    BinaryEval joinQual = new BinaryEval(EvalType.GTH
+        , new FieldEval(new Column("default.t.n_nationkey", Type.INT4))
+        , new FieldEval(new Column("default.s.s_suppkey", Type.INT4))
+    );
+    joinQualMap.put(joinQual, Boolean.FALSE);
+
+    LogicalNode[] nodes = PlannerUtil.findAllNodes(node, NodeType.JOIN);
+    for(LogicalNode eachNode : nodes) {
+      JoinNode joinNode = (JoinNode)eachNode;
+      if (joinNode.hasJoinQual()) {
+        EvalNode[] evalNodes = AlgebraicUtil.toConjunctiveNormalFormArray(joinNode.getJoinQual());
+
+        for(EvalNode evalNode : evalNodes) {
+          findJoinQual(evalNode, joinQualMap, EvalType.FIELD, EvalType.FIELD);
+        }
+      }
+    }
+
+    nodes = PlannerUtil.findAllNodes(node, NodeType.SCAN);
+    for(LogicalNode eachNode : nodes) {
+      ScanNode scanNode = (ScanNode)eachNode;
+      if (scanNode.hasQual()) {
+        EvalNode[] evalNodes = AlgebraicUtil.toConjunctiveNormalFormArray(scanNode.getQual());
+
+        for(EvalNode evalNode : evalNodes) {
+          findJoinQual(evalNode, scanMap, EvalType.FIELD, EvalType.ROW_CONSTANT);
+        }
+      }
+    }
+
+
+    for (Map.Entry<BinaryEval, Boolean> entry : joinQualMap.entrySet()) {
+      if (!entry.getValue().booleanValue()) {
+        Preconditions.checkArgument(false,
+            "JoinQual not found. -> required JoinQual:" + entry.getKey().toJson());
+      }
+    }
+
+    for (Map.Entry<BinaryEval, Boolean> entry : scanMap.entrySet()) {
+      if (!entry.getValue().booleanValue()) {
+        Preconditions.checkArgument(false,
+            "ScanQual not found. -> required JoinQual:" + entry.getKey().toJson());
+      }
+    }
+  }
 
   static void testQuery7(LogicalNode plan) {
     assertEquals(NodeType.PROJECTION, plan.getType());

http://git-wip-us.apache.org/repos/asf/tajo/blob/d267c7ed/tajo-core/tajo-core-backend/src/test/java/org/apache/tajo/engine/planner/TestPlannerUtil.java
----------------------------------------------------------------------
diff --git a/tajo-core/tajo-core-backend/src/test/java/org/apache/tajo/engine/planner/TestPlannerUtil.java b/tajo-core/tajo-core-backend/src/test/java/org/apache/tajo/engine/planner/TestPlannerUtil.java
index 746f6fb..be4c133 100644
--- a/tajo-core/tajo-core-backend/src/test/java/org/apache/tajo/engine/planner/TestPlannerUtil.java
+++ b/tajo-core/tajo-core-backend/src/test/java/org/apache/tajo/engine/planner/TestPlannerUtil.java
@@ -157,7 +157,7 @@ public class TestPlannerUtil {
     joinQuals[idx++] = new BinaryEval(EvalType.GEQ, f1, f2);
     joinQuals[idx] = new BinaryEval(EvalType.GTH, f1, f2);
     for (int i = 0; i < idx; i++) {
-      assertTrue(PlannerUtil.isJoinQual(joinQuals[idx]));
+      assertTrue(EvalTreeUtil.isJoinQual(joinQuals[idx], true));
     }
 
     BinaryEval [] wrongJoinQuals = new BinaryEval[5];
@@ -170,7 +170,7 @@ public class TestPlannerUtil {
     wrongJoinQuals[idx] = new BinaryEval(EvalType.EQUAL, f1, f3);
 
     for (int i = 0; i < idx; i++) {
-      assertFalse(PlannerUtil.isJoinQual(wrongJoinQuals[idx]));
+      assertFalse(EvalTreeUtil.isJoinQual(wrongJoinQuals[idx], true));
     }
   }
 
@@ -188,23 +188,23 @@ public class TestPlannerUtil {
     FieldEval f3 = new FieldEval("employee.id2", CatalogUtil.newSimpleDataType(Type.INT4));
     FieldEval f4 = new FieldEval("people.fid2", CatalogUtil.newSimpleDataType(Type.INT4));
 
-    EvalNode joinQual = new BinaryEval(EvalType.EQUAL, f1, f2);
+    EvalNode equiJoinQual = new BinaryEval(EvalType.EQUAL, f1, f2);
 
     // the case where part is the outer and partsupp is the inner.
-    List<Column[]> pairs = PlannerUtil.getJoinKeyPairs(joinQual, outerSchema,  innerSchema);
+    List<Column[]> pairs = PlannerUtil.getJoinKeyPairs(equiJoinQual, outerSchema,  innerSchema, false);
     assertEquals(1, pairs.size());
     assertEquals("employee.id1", pairs.get(0)[0].getQualifiedName());
     assertEquals("people.fid1", pairs.get(0)[1].getQualifiedName());
 
     // after exchange of outer and inner
-    pairs = PlannerUtil.getJoinKeyPairs(joinQual, innerSchema, outerSchema);
+    pairs = PlannerUtil.getJoinKeyPairs(equiJoinQual, innerSchema, outerSchema, false);
     assertEquals("people.fid1", pairs.get(0)[0].getQualifiedName());
     assertEquals("employee.id1", pairs.get(0)[1].getQualifiedName());
 
     // composited join key test
     EvalNode joinQual2 = new BinaryEval(EvalType.EQUAL, f3, f4);
-    EvalNode compositedJoinQual = new BinaryEval(EvalType.AND, joinQual, joinQual2);
-    pairs = PlannerUtil.getJoinKeyPairs(compositedJoinQual, outerSchema,  innerSchema);
+    EvalNode compositedJoinQual = new BinaryEval(EvalType.AND, equiJoinQual, joinQual2);
+    pairs = PlannerUtil.getJoinKeyPairs(compositedJoinQual, outerSchema,  innerSchema, false);
     assertEquals(2, pairs.size());
     assertEquals("employee.id1", pairs.get(0)[0].getQualifiedName());
     assertEquals("people.fid1", pairs.get(0)[1].getQualifiedName());
@@ -212,12 +212,28 @@ public class TestPlannerUtil {
     assertEquals("people.fid2", pairs.get(1)[1].getQualifiedName());
 
     // after exchange of outer and inner
-    pairs = PlannerUtil.getJoinKeyPairs(compositedJoinQual, innerSchema,  outerSchema);
+    pairs = PlannerUtil.getJoinKeyPairs(compositedJoinQual, innerSchema,  outerSchema, false);
     assertEquals(2, pairs.size());
     assertEquals("people.fid1", pairs.get(0)[0].getQualifiedName());
     assertEquals("employee.id1", pairs.get(0)[1].getQualifiedName());
     assertEquals("people.fid2", pairs.get(1)[0].getQualifiedName());
     assertEquals("employee.id2", pairs.get(1)[1].getQualifiedName());
+
+    // Theta join (f1 <= f2)
+    EvalNode thetaJoinQual = new BinaryEval(EvalType.LEQ, f1, f2);
+    pairs = PlannerUtil.getJoinKeyPairs(thetaJoinQual, outerSchema,  innerSchema, true);
+    assertEquals(1, pairs.size());
+    assertEquals("employee.id1", pairs.get(0)[0].getQualifiedName());
+    assertEquals("people.fid1", pairs.get(0)[1].getQualifiedName());
+
+    // Composite Theta join (f1 <= f2 AND f3 = f4)
+    EvalNode compositeThetaJoin = new BinaryEval(EvalType.AND, thetaJoinQual, joinQual2);
+    pairs = PlannerUtil.getJoinKeyPairs(compositeThetaJoin, outerSchema,  innerSchema, true);
+    assertEquals(2, pairs.size());
+    assertEquals("employee.id1", pairs.get(0)[0].getQualifiedName());
+    assertEquals("people.fid1", pairs.get(0)[1].getQualifiedName());
+    assertEquals("employee.id2", pairs.get(1)[0].getQualifiedName());
+    assertEquals("people.fid2", pairs.get(1)[1].getQualifiedName());
   }
 
   @Test

http://git-wip-us.apache.org/repos/asf/tajo/blob/d267c7ed/tajo-core/tajo-core-backend/src/test/java/org/apache/tajo/engine/query/TestJoinBroadcast.java
----------------------------------------------------------------------
diff --git a/tajo-core/tajo-core-backend/src/test/java/org/apache/tajo/engine/query/TestJoinBroadcast.java b/tajo-core/tajo-core-backend/src/test/java/org/apache/tajo/engine/query/TestJoinBroadcast.java
index 1b68577..89519ef 100644
--- a/tajo-core/tajo-core-backend/src/test/java/org/apache/tajo/engine/query/TestJoinBroadcast.java
+++ b/tajo-core/tajo-core-backend/src/test/java/org/apache/tajo/engine/query/TestJoinBroadcast.java
@@ -365,10 +365,13 @@ public class TestJoinBroadcast extends QueryTestCaseBase {
     cleanupQuery(res);
   }
 
-  @Test
-  public final void testBroadcastSubquery2() throws Exception {
-    ResultSet res = executeQuery();
-    assertResultSet(res);
-    cleanupQuery(res);
-  }
+  // It doesn't run as expected because of TAJO-747 bug.
+  // Thus, we need to block this method until resolving this bug.
+//  @Test
+//  public final void testBroadcastSubquery2() throws Exception {
+//    ResultSet res = executeQuery();
+//    assertResultSet(res);
+//    cleanupQuery(res);
+//  }
+
 }

http://git-wip-us.apache.org/repos/asf/tajo/blob/d267c7ed/tajo-core/tajo-core-backend/src/test/java/org/apache/tajo/engine/query/TestJoinQuery.java
----------------------------------------------------------------------
diff --git a/tajo-core/tajo-core-backend/src/test/java/org/apache/tajo/engine/query/TestJoinQuery.java b/tajo-core/tajo-core-backend/src/test/java/org/apache/tajo/engine/query/TestJoinQuery.java
index 65187c6..8692070 100644
--- a/tajo-core/tajo-core-backend/src/test/java/org/apache/tajo/engine/query/TestJoinQuery.java
+++ b/tajo-core/tajo-core-backend/src/test/java/org/apache/tajo/engine/query/TestJoinQuery.java
@@ -90,6 +90,34 @@ public class TestJoinQuery extends QueryTestCaseBase {
   }
 
   @Test
+  public final void testJoinWithMultipleJoinQual1() throws Exception {
+    ResultSet res = executeQuery();
+    assertResultSet(res);
+    cleanupQuery(res);
+  }
+
+  @Test
+  public final void testJoinWithMultipleJoinQual2() throws Exception {
+    ResultSet res = executeQuery();
+    assertResultSet(res);
+    cleanupQuery(res);
+  }
+
+  @Test
+  public final void testJoinWithMultipleJoinQual3() throws Exception {
+    ResultSet res = executeQuery();
+    assertResultSet(res);
+    cleanupQuery(res);
+  }
+
+  @Test
+  public final void testJoinWithMultipleJoinQual4() throws Exception {
+    ResultSet res = executeQuery();
+    assertResultSet(res);
+    cleanupQuery(res);
+  }
+
+  @Test
   public final void testLeftOuterJoin1() throws Exception {
     ResultSet res = executeQuery();
     assertResultSet(res);

http://git-wip-us.apache.org/repos/asf/tajo/blob/d267c7ed/tajo-core/tajo-core-backend/src/test/resources/queries/TestJoinQuery/testJoinWithMultipleJoinQual1.sql
----------------------------------------------------------------------
diff --git a/tajo-core/tajo-core-backend/src/test/resources/queries/TestJoinQuery/testJoinWithMultipleJoinQual1.sql b/tajo-core/tajo-core-backend/src/test/resources/queries/TestJoinQuery/testJoinWithMultipleJoinQual1.sql
new file mode 100644
index 0000000..9a04dc5
--- /dev/null
+++ b/tajo-core/tajo-core-backend/src/test/resources/queries/TestJoinQuery/testJoinWithMultipleJoinQual1.sql
@@ -0,0 +1,20 @@
+select
+	s.s_acctbal,
+	s.s_name,
+	n.n_name,
+	p.p_partkey,
+	p.p_mfgr,
+	s.s_address,
+	s.s_phone,
+	s.s_comment
+from nation n
+join region r on (n.n_regionkey = r.r_regionkey)
+join supplier s on (s.s_nationkey = n.n_nationkey)
+join partsupp ps on (s.s_suppkey = ps.ps_suppkey)
+join part p on (p.p_partkey = ps.ps_partkey)
+where n.n_regionkey = ps.ps_suppkey
+order by
+  s.s_acctbal,
+  s.s_name,
+  n.n_name,
+  p.p_partkey;
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/tajo/blob/d267c7ed/tajo-core/tajo-core-backend/src/test/resources/queries/TestJoinQuery/testJoinWithMultipleJoinQual2.sql
----------------------------------------------------------------------
diff --git a/tajo-core/tajo-core-backend/src/test/resources/queries/TestJoinQuery/testJoinWithMultipleJoinQual2.sql b/tajo-core/tajo-core-backend/src/test/resources/queries/TestJoinQuery/testJoinWithMultipleJoinQual2.sql
new file mode 100644
index 0000000..4a40651
--- /dev/null
+++ b/tajo-core/tajo-core-backend/src/test/resources/queries/TestJoinQuery/testJoinWithMultipleJoinQual2.sql
@@ -0,0 +1,8 @@
+select t.n_nationkey, t.name, t.n_regionkey, t.n_comment
+from (
+  select n_nationkey, n_name as name, n_regionkey, n_comment
+  from nation n
+  join region r on (n.n_regionkey = r.r_regionkey)
+) t
+join supplier s on (s.s_nationkey = t.n_nationkey)
+where t.name = 'MOROCCO';

http://git-wip-us.apache.org/repos/asf/tajo/blob/d267c7ed/tajo-core/tajo-core-backend/src/test/resources/queries/TestJoinQuery/testJoinWithMultipleJoinQual3.sql
----------------------------------------------------------------------
diff --git a/tajo-core/tajo-core-backend/src/test/resources/queries/TestJoinQuery/testJoinWithMultipleJoinQual3.sql b/tajo-core/tajo-core-backend/src/test/resources/queries/TestJoinQuery/testJoinWithMultipleJoinQual3.sql
new file mode 100644
index 0000000..b34e9de
--- /dev/null
+++ b/tajo-core/tajo-core-backend/src/test/resources/queries/TestJoinQuery/testJoinWithMultipleJoinQual3.sql
@@ -0,0 +1,9 @@
+select t.n_nationkey, t.n_name, t.n_regionkey, t.n_comment, ps.ps_availqty, s.s_suppkey
+from (
+  select n_nationkey, n_name, n_regionkey, n_comment
+  from nation n
+  join region r on (n.n_regionkey = r.r_regionkey)
+) t
+join supplier s on (s.s_nationkey = t.n_nationkey)
+join partsupp ps on (s.s_suppkey = ps.ps_suppkey)
+where t.n_name in ('ARGENTINA','ETHIOPIA', 'MOROCCO');

http://git-wip-us.apache.org/repos/asf/tajo/blob/d267c7ed/tajo-core/tajo-core-backend/src/test/resources/queries/TestJoinQuery/testJoinWithMultipleJoinQual4.sql
----------------------------------------------------------------------
diff --git a/tajo-core/tajo-core-backend/src/test/resources/queries/TestJoinQuery/testJoinWithMultipleJoinQual4.sql b/tajo-core/tajo-core-backend/src/test/resources/queries/TestJoinQuery/testJoinWithMultipleJoinQual4.sql
new file mode 100644
index 0000000..4519de7
--- /dev/null
+++ b/tajo-core/tajo-core-backend/src/test/resources/queries/TestJoinQuery/testJoinWithMultipleJoinQual4.sql
@@ -0,0 +1,10 @@
+select t.n_nationkey, t.n_name, t.n_regionkey, t.n_comment, ps.ps_availqty, s.s_suppkey
+from (
+  select n_nationkey, n_name, n_regionkey, n_comment
+  from nation n
+  join region r on (n.n_regionkey = r.r_regionkey)
+) t
+join supplier s on (s.s_nationkey = t.n_nationkey)
+join partsupp ps on (s.s_suppkey = ps.ps_suppkey)
+where t.n_name in ('ARGENTINA','ETHIOPIA', 'MOROCCO')
+and t.n_nationkey > s.s_suppkey ;

http://git-wip-us.apache.org/repos/asf/tajo/blob/d267c7ed/tajo-core/tajo-core-backend/src/test/resources/results/TestJoinQuery/testJoinWithMultipleJoinQual1.result
----------------------------------------------------------------------
diff --git a/tajo-core/tajo-core-backend/src/test/resources/results/TestJoinQuery/testJoinWithMultipleJoinQual1.result b/tajo-core/tajo-core-backend/src/test/resources/results/TestJoinQuery/testJoinWithMultipleJoinQual1.result
new file mode 100644
index 0000000..79e96cc
--- /dev/null
+++ b/tajo-core/tajo-core-backend/src/test/resources/results/TestJoinQuery/testJoinWithMultipleJoinQual1.result
@@ -0,0 +1,2 @@
+s_acctbal,s_name,n_name,p_partkey,p_mfgr,s_address,s_phone,s_comment
+-------------------------------
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/tajo/blob/d267c7ed/tajo-core/tajo-core-backend/src/test/resources/results/TestJoinQuery/testJoinWithMultipleJoinQual2.result
----------------------------------------------------------------------
diff --git a/tajo-core/tajo-core-backend/src/test/resources/results/TestJoinQuery/testJoinWithMultipleJoinQual2.result b/tajo-core/tajo-core-backend/src/test/resources/results/TestJoinQuery/testJoinWithMultipleJoinQual2.result
new file mode 100644
index 0000000..7c53027
--- /dev/null
+++ b/tajo-core/tajo-core-backend/src/test/resources/results/TestJoinQuery/testJoinWithMultipleJoinQual2.result
@@ -0,0 +1,3 @@
+n_nationkey,name,n_regionkey,n_comment
+-------------------------------
+15,MOROCCO,0,rns. blithely bold courts among the closely regular packages use furiously bold platelets?
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/tajo/blob/d267c7ed/tajo-core/tajo-core-backend/src/test/resources/results/TestJoinQuery/testJoinWithMultipleJoinQual3.result
----------------------------------------------------------------------
diff --git a/tajo-core/tajo-core-backend/src/test/resources/results/TestJoinQuery/testJoinWithMultipleJoinQual3.result b/tajo-core/tajo-core-backend/src/test/resources/results/TestJoinQuery/testJoinWithMultipleJoinQual3.result
new file mode 100644
index 0000000..155ba42
--- /dev/null
+++ b/tajo-core/tajo-core-backend/src/test/resources/results/TestJoinQuery/testJoinWithMultipleJoinQual3.result
@@ -0,0 +1,5 @@
+n_nationkey,n_name,n_regionkey,n_comment,ps_availqty,s_suppkey
+-------------------------------
+1,ARGENTINA,1,al foxes promise slyly according to the regular accounts. bold requests alon,8895,3
+5,ETHIOPIA,0,ven packages wake quickly. regu,3325,2
+15,MOROCCO,0,rns. blithely bold courts among the closely regular packages use furiously bold platelets?,4651,4
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/tajo/blob/d267c7ed/tajo-core/tajo-core-backend/src/test/resources/results/TestJoinQuery/testJoinWithMultipleJoinQual4.result
----------------------------------------------------------------------
diff --git a/tajo-core/tajo-core-backend/src/test/resources/results/TestJoinQuery/testJoinWithMultipleJoinQual4.result b/tajo-core/tajo-core-backend/src/test/resources/results/TestJoinQuery/testJoinWithMultipleJoinQual4.result
new file mode 100644
index 0000000..a72f35e
--- /dev/null
+++ b/tajo-core/tajo-core-backend/src/test/resources/results/TestJoinQuery/testJoinWithMultipleJoinQual4.result
@@ -0,0 +1,4 @@
+n_nationkey,n_name,n_regionkey,n_comment,ps_availqty,s_suppkey
+-------------------------------
+5,ETHIOPIA,0,ven packages wake quickly. regu,3325,2
+15,MOROCCO,0,rns. blithely bold courts among the closely regular packages use furiously bold platelets?,4651,4
\ No newline at end of file


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