GitHub user ptkool opened a pull request:
https://github.com/apache/spark/pull/17899
[SPARK-20636] Add new optimization rule to flip adjacent Window expressions.
## What changes were proposed in this pull request?
Add new optimization rule to eliminate unnecessary shuffling by flipping
adjacent Window expressions.
## How was this patch tested?
Tested with unit tests, integration tests, and manual tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ptkool/spark adjacent_window_optimization
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17899.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #17899
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