Github user sameeragarwal commented on the pull request:
https://github.com/apache/spark/pull/11953#issuecomment-201172780
cc @davies: I verified that this patch fixes `union20` in
`HiveCompatibilitySuite`. The issue apparently was that when `NullFiltering`
rule removed the filters for non-nullable attributes, we lost track of their
corresponding constraints (and they'd then be pushed back by
`InferFiltersFromConstraints`)
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