Github user HyukjinKwon commented on the issue:

    https://github.com/apache/spark/pull/20373
  
    I think it's fine in cloudpickle but Spark has the hijacking for regular 
pickling. I was thinking of a possibility for a deduplicated fix but might have 
to be investigated separately.
    
    Let's hold this on a bit until the release of 2.3.0 as it's going to go 
into master anyway (I think). Seems it's been delayed unexpectedly and we 
better keep the diff small between master and branch-2.3 for now. Will keep my 
eyes on this PR anyway.


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