Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/18895 Guys, I am sorry but I think I have to revert this by few explicit objections, for now. Maybe, I am now rushing to revert it but please don't mind because we are close to 2.3.0. Please join in the discussion about the original implementation details in https://github.com/apache/spark/pull/16793. Thanks.
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