Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/11427#issuecomment-200514378
Thank you! @liancheng
Now, this rule supports collapsing two continuous `Project` operators and
one upper `Project` and one lower `Aggregate`.
After rethinking it, maybe we also can collapse one upper `Aggregate` into
one lower `Project`. Will try to submit a PR for this. : )
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