[GitHub] [spark] JoshRosen edited a comment on issue #24765: [SPARK-27915][SQL][WIP] Update logical Filter's output nullability based on IsNotNull conditions

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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.
   
   **Update**: on closer reading, it sounds like I might actually need the code removed in #23508 in order for this to work.

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