Github user sameeragarwal commented on the pull request:
https://github.com/apache/spark/pull/11649#issuecomment-195238973
@gatorsmile this change makes sense to me, however what are your thoughts
on slightly widening the scope of this change and not generating `IsNotNull`
constraints for any compound expression (in `constructIsNotNullConstraints`)?
As you pointed out, I can't think of an optimization that can make use of these
non-nullability constraints for compound expressions. Later, we can always
extend `constructIsNotNullConstraints` to infer `isNotNull` constraints for
individual attributes from compound expressions.
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