Github user snodawn commented on the issue:
https://github.com/apache/spark/pull/15667
Sorry, I'm later, for preparing the environment for testing cost me a lot
of time. I have tested the performance before and after the patch. But it seems
to improve a few after patching, where it costs 531 seconds before patching,
and costs 518 seconds after patching. So I think I need to do more testing to
find out the problem.
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