Github user aokolnychyi commented on the issue:
https://github.com/apache/spark/pull/18692
@cloud-fan which rule do you mean? `PushPredicateThroughJoin` seems to be
the closest by logic but it has a slightly different purpose and does not cover
this use case. In fact, I used the proposed rule in conjunction with
`PushPredicateThroughJoin` in the tests.
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