Maryann Xue created PHOENIX-4599:

             Summary: Push LIMIT down to sort-merge-join's preserved side
                 Key: PHOENIX-4599
             Project: Phoenix
          Issue Type: Improvement
            Reporter: Maryann Xue
            Assignee: Maryann Xue

In OUTER sort-merge-joins, LIMIT being pushed down to one/both of its child 
plans will lead to less bytes being scanned or sorted and can have a 
significant performance impact.

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