Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/1190#issuecomment-47177647
The `join/where` predicate push down has been done in
`PushPredicateThroughJoin` of the logical plan optimizer, I don't think we
really need to do it again here. Hence I wrote an new pattern
`ExtractEquiJoinKeys` to extract the join keys only, which should be more
specific.
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