Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/11691#issuecomment-196434407
I tend to agree. We certainly could enumerate many more constraints, but I
think that we should limit the scope to those that we know we are going to use
later (`IsNotNull` for example is very useful for lots of things). Reasoning
about disjunctive predicates on the other hand is not super easy, so I'd want
to see concrete examples where this information was useful before going down
this path.
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