Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/19497 I agree this was focussed more on the regression introduced and it should be good enough already, and I am talking about a different thing for behaviour change. Let me organise my idea and and try to file a JIRA later. I think strictly this is separate anyway if I haven't missed something or simply I was wrong.
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