Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/15482
I think he met this in
https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/66954/testReport/
which seems a possibly flaky test. It seems several latest tests gone fine
though. Maybe it'd be great if we identify the cause and a proper fix.
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