Github user sameeragarwal commented on the pull request:
https://github.com/apache/spark/pull/11649#issuecomment-195611317
@marmbrus the reason for adding these inferred filters in the logical plan
is because we currently only propagate constraints in the logical plan (and
they are not directly accessible during code generation).
In theory, we can propagate constraints in the physical plan instead but
that'd be slightly unclean (since we'd then need to add propagation logic for
all individual physical operators). @nongli, @yhuai and I briefly discussed the
pros and cons of the 2 approaches yesterday and then decided to go with the
current approach.
PS: Added comments in https://github.com/apache/spark/pull/11665.
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