Github user davies commented on the pull request:
https://github.com/apache/spark/pull/11585#issuecomment-194076759
After offline discussion with @sameeragarwal , we agreed that 1) the
constraints should only used in logical plan 2) we should use the `IsNotNull()`
inserted by #11372, 3) we do need to re-order the conditions anymore, just do
that in Filter. 4) The `IsNotNull` from join ares pushed down into it's
children, join requires nullability propagated from it's children, that's
another story.
I will update this PR based on these, and revert #11511
cc @yhuai @nongli
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