Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/16799
thanks @gatorsmile, @actuaryzhang @wangmiao1981
we did see it on the [other
PR](https://github.com/apache/spark/pull/16794#issuecomment-277378323) but I
didn't put the two together. And sorry for missing the fact that Jenkins was
never run on the PR that broken the build - comment threads were too long and
AppVeyor green checkmark was there (need to follow up) - will be more careful
the next time.
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