Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/21543
This should go into branch-2.3 too.
I also think this is a little fragile (which is why I filed SPARK-24532),
and I've been playing with some alternative code, but it feels like a bit too
much code to avoid a little extra work on every release...
https://github.com/vanzin/spark/tree/SPARK-24532
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