Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/11565#issuecomment-194713298
In the latest PR: we added two more cases/rules into the Optimizer.
- After column pruning, if `Window` could contain an empty
`windowExpressions` list, we can remove it
- After column pruning, if `Aggregate` does not contain any
`AggregateExpression`, we can replace it by `Project`. Then, `Project` can be
collapsed or pushed down further.
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