Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/8200#issuecomment-132056044
@cloud-fan Conjunctions (`And` predicates) are more friendlier to filter
push-down optimization. Because it doesn't require both branches to be
convertible. Take predicate `a <= 1 AND someUdf(b)` as an example, UDF is not
pushable, but it's still safe to push `a <= 1`. On the other hand, if you got
`a > 1 OR !someUdf(b)`, you can't push down `a > 1`.
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