Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/11565#issuecomment-193614610
After think about it more, I think the `projectList` maybe useful to do
column pruning for `Window`.
If there is a `Project` above `Window`, it's easy to filter out unnecessary
window expressions. However, it's hard to propagate this information top down.
The `projectList` can store this information and continue to do column pruning
under `Window`.
Any ideas? cc @yhuai
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