Github user dongjoon-hyun commented on the pull request:
https://github.com/apache/spark/pull/12719#issuecomment-215620369
If that's just about how to handle `Sort(_, Project(_,_))` expressions in
`EliminateSorts`, I can easily modify this PR according to your advice.
After moving up the foldables, and the existing `case` statement removes
them eventually.
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