Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/11809#issuecomment-199443463
Yeah, also agree with @marmbrus .
This is a general issue. When fixing `isNotNull` Constraints, we also have
to fix the related reasoning parts for using these Constraints. If possible, we
really need to have a fundamental way to do it easily. Otherwise, we might fix
many small bugs again and again.
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