Github user cloud-fan commented on the issue: https://github.com/apache/spark/pull/22514 It's definitely not a blocker, and we don't need to hold RC5 because of it. I think it needs a little more review, and I'm going to cut RC5 today(2.4.0 has already been far delayed), so it's very likely we can't get it into 2.4.0.
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