JoshRosen edited a comment on issue #24765: [SPARK-27915][SQL][WIP] Update logical Filter's output nullability based on IsNotNull conditions URL: https://github.com/apache/spark/pull/24765#issuecomment-511259953 /cc @maropu, who submitted a very similar change ~1 year prior in #21148 (I was unaware of that PR when I created this one). Chasing down references from that PR, I discovered https://github.com/apache/spark/pull/23390 and https://github.com/apache/spark/pull/23508, both of which are concerned with fixing up nullability in attribute references; maybe one of those holds the blocker identified in my previous comment.
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