Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/13619
FYI, it passes in branch-1.6 because it does not check whether the count is
0 or not. This checking is introduced in
https://github.com/apache/spark/commit/101663f1ae222a919fc40510aa4f2bad22d1be6f.
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