Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/10128#issuecomment-169524856
How does this make a difference in join selection? I think the logic in
`ExtractEquiJoinKeys` is already smart enough to do this correctly. Even if
that was not the case we should not mix concerns here. Rules should be kept as
simple as possible to avoid bugs.
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