Github user cloud-fan commented on the issue:

    https://github.com/apache/spark/pull/22494
  
    This PR is a no-op if users don't turn off #20023 . The benefit of this PR 
is: before we fully fix that bug, if a user hit it, he can turn off #20023 to 
temporarily work around it. So I don't see any harm of this PR.
    
    Turning off #20023  by default is another story and I'd like to get more 
feedback before doing it.


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