@Test
  public final void testRightOuter_MergeJoin3() throws IOException, TajoException {
    Expr expr = analyzer.parse(QUERIES[3]);
    LogicalNode plan = planner.createPlan(defaultContext, expr).getRootBlock().getRoot();
    JoinNode joinNode = PlannerUtil.findTopNode(plan, NodeType.JOIN);
    Enforcer enforcer = new Enforcer();
    enforcer.enforceJoinAlgorithm(joinNode.getPID(), JoinAlgorithm.MERGE_JOIN);

    FileFragment[] emp3Frags =
        FileTablespace.splitNG(
            conf, EMP3_NAME, emp3.getMeta(), new Path(emp3.getUri()), Integer.MAX_VALUE);
    FileFragment[] dep4Frags =
        FileTablespace.splitNG(
            conf, DEP4_NAME, dep4.getMeta(), new Path(dep4.getUri()), Integer.MAX_VALUE);
    FileFragment[] merged = TUtil.concat(emp3Frags, dep4Frags);

    Path workDir =
        CommonTestingUtil.getTestDir(
            TajoTestingCluster.DEFAULT_TEST_DIRECTORY + "/testRightOuter_MergeJoin3");
    TaskAttemptContext ctx =
        new TaskAttemptContext(
            new QueryContext(conf), LocalTajoTestingUtility.newTaskAttemptId(), merged, workDir);
    ctx.setEnforcer(enforcer);

    PhysicalPlanner phyPlanner = new PhysicalPlannerImpl(conf);
    PhysicalExec exec = phyPlanner.createPlan(ctx, plan);

    ProjectionExec proj = (ProjectionExec) exec;
    assertTrue(proj.getChild() instanceof RightOuterMergeJoinExec);

    int count = 0;
    exec.init();

    while (exec.next() != null) {
      // TODO check contents
      count = count + 1;
    }
    assertNull(exec.next());
    exec.close();
    assertEquals(13, count);
  }