Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/10362#issuecomment-165615441
@gatorsmile My feeling is that when we process an inner `AND`, in general,
we do not know what is the outer predicate. So, we do not know if it is safe to
just push one side of the `AND`. It is the reason that I an removing this
partial pushdown logic for inner `AND`.
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