Github user jerryshao commented on the pull request:
https://github.com/apache/spark/pull/11129#issuecomment-217768853
>now, maximally devious would be to catch the exception and downgrade
Maybe we could do this in Spark side, though a little complicated but
doable.
Yes it is hard to test label related things in Spark side, at least we
could manually verify it locally.
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