Github user gatorsmile commented on the issue: https://github.com/apache/spark/pull/14815 In 2.0, we combined the PPD rules. Now, only two PPD rules left, `PushPredicateThroughJoin` and `PushDownPredicate`. IMO, the major reason why we did not combine them into the same one is because PPD for `Join` is a little bit special.
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