peter-toth commented on pull request #31913:
URL: https://github.com/apache/spark/pull/31913#issuecomment-803548910


   The `Not(IsNull(e)) => IsNotNull(e)` and `Not(IsNotNull(e)) => IsNull(e)` 
optimizations were introduced in https://github.com/apache/spark/pull/25878 so 
the example query is a regression from 2.4 to 3.x, but I'm not sure that the 
issue doesn't come up in Spark 2.4 at all.


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