Github user dongjoon-hyun commented on the pull request:
https://github.com/apache/spark/pull/12719#issuecomment-215619413
Actually, `Sort` is dead end, we can not propagate up anymore.
So, in that case, removing looks more efficient.
Do you mean more generalized `FoldablePropagation` like `NullPropagation`
by 'not only Sort'?
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