Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/18945
@logannc, mind adding the JIRA number in this PR title as described in the
guide line?
I definitely also think this needs a JIRA as before and after are not
virtually same and it looks a non-trivial change - this even could be a
regression if SPARK-21163 was resolved in 2.2.0. I believe tests are required
here too.
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