Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/21427
btw, we should really mark this as experimental and allow a bit of
behaviour changes really. I guess that's what we meat by Experimental:
https://github.com/apache/spark/blob/39e2bad6a866d27c3ca594d15e574a1da3ee84cc/common/tags/src/main/java/org/apache/spark/annotation/Experimental.java#L25
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