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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