cloud-fan commented on issue #27233: [WIP][SPARK-29701][SQL] Correct behaviours of group analytical queries when empty input given URL: https://github.com/apache/spark/pull/27233#issuecomment-575533810 what problems do you hit when dealing with sort/filter? I took a quick look and have no clue. If it's difficult, I'm ok to do it in optimizer too.
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