Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/20003
I am also backporting this to branch-2.2 and branch-2.1 too. Currently, we
don't run AppVeyor on those branches so it's fine but we will potentially meet
this test failure if we start to run.
Also, I remember I manually run this before each release. It should be
useful to backport.
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