Github user yhuai commented on the issue:
https://github.com/apache/spark/pull/19448
@HyukjinKwon branch-2.2 is in a maintenance branch, I am not sure it is
appropriate to merge this change to branch-2.2 since it is not really a bug
fix. If the doc is not accurate, we should fix the doc. For a maintenance
branch, we need to be very careful on what we merge and we should always avoid
of unnecessary changes.
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