algebricks/algebricks-rewriter/src/main/java/org/apache/hyracks/algebricks/rewriter/rules/subplan/IntroduceGroupByForSubplanRule.java [107:134]:
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    @Override
    public boolean rewritePre(Mutable<ILogicalOperator> opRef, IOptimizationContext context)
            throws AlgebricksException {
        return false;
    }

    @Override
    public boolean rewritePost(Mutable<ILogicalOperator> opRef, IOptimizationContext context)
            throws AlgebricksException {
        AbstractLogicalOperator op0 = (AbstractLogicalOperator) opRef.getValue();
        if (op0.getOperatorTag() != LogicalOperatorTag.SUBPLAN) {
            return false;
        }
        SubplanOperator subplan = (SubplanOperator) op0;

        Iterator<ILogicalPlan> plansIter = subplan.getNestedPlans().iterator();
        ILogicalPlan p = null;
        while (plansIter.hasNext()) {
            p = plansIter.next();
        }
        if (p == null) {
            return false;
        }
        if (p.getRoots().size() != 1) {
            return false;
        }
        Mutable<ILogicalOperator> subplanRoot = p.getRoots().get(0);
        AbstractLogicalOperator op1 = (AbstractLogicalOperator) subplanRoot.getValue();
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algebricks/algebricks-rewriter/src/main/java/org/apache/hyracks/algebricks/rewriter/rules/subplan/IntroduceLeftOuterJoinForSubplanRule.java [38:65]:
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    @Override
    public boolean rewritePre(Mutable<ILogicalOperator> opRef, IOptimizationContext context)
            throws AlgebricksException {
        return false;
    }

    @Override
    public boolean rewritePost(Mutable<ILogicalOperator> opRef, IOptimizationContext context)
            throws AlgebricksException {
        AbstractLogicalOperator op0 = (AbstractLogicalOperator) opRef.getValue();
        if (op0.getOperatorTag() != LogicalOperatorTag.SUBPLAN) {
            return false;
        }
        SubplanOperator subplan = (SubplanOperator) op0;

        Iterator<ILogicalPlan> plansIter = subplan.getNestedPlans().iterator();
        ILogicalPlan p = null;
        while (plansIter.hasNext()) {
            p = plansIter.next();
        }
        if (p == null) {
            return false;
        }
        if (p.getRoots().size() != 1) {
            return false;
        }
        Mutable<ILogicalOperator> subplanRoot = p.getRoots().get(0);
        AbstractLogicalOperator op1 = (AbstractLogicalOperator) subplanRoot.getValue();
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