Github user srowen commented on the issue:
https://github.com/apache/spark/pull/18860
Yes, tough call on the back-port. I'd normally say we don't back-port
optimizations to maintenance branches. If the optimization relieved a
significant usability problem, you could consider it a bug fix. For this one
I'm on the fence about it, and would prefer to hear someone else in support of
it.
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