Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/21682
re: https://github.com/apache/spark/pull/21682#issuecomment-401676889 - I
couldn't recall related things about it. Thanks @gatorsmile. So, is it a
regression? shall we update the migration guide to note that the performance
effect?
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