cloud-fan commented on issue #25925: [SPARK-29239][SPARK-29221][SQL] Subquery should not cause NPE when eliminating subexpression URL: https://github.com/apache/spark/pull/25925#issuecomment-535351458 thanks, merging to master! @viirya can you send another PR to 2.4? I tried to backport but it has conflicts.
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