Github user holdenk commented on the issue:
https://github.com/apache/spark/pull/15960
Arguing on the for-side: if we do want to add a rule like this adding it
closer to the start of the 2.X series is probably the time to do it - any
backports will hopefully not need to go back very far. (Otherwise we could
leave it for the start of the 3.X since backports across major versions are
already normally a bit painful).
Maybe it would make sense to run spark-perf & spark-sql-perf on this branch
and see if there is any meaningful performance improvement?
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