Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/8922#issuecomment-145926723
I'm not suggesting we specialize for UDFs that are Int => Boolean. I'm
suggesting that we generate a function for any predicate that only takes a
single attribute as input and then pass that generated function as a filter to
the data sources. That way this will work for more than just simple
comparisons with UDFs. We can do this for any predicates that are not matched
by the other filter patterns.
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