Github user HyukjinKwon commented on the issue:

    https://github.com/apache/spark/pull/19492
  
    I am actually still hesitant. FWIW, there's another PR for this if I am not 
mistaken - `https://github.com/apache/spark/pull/21439`. I don't quite like 
that approach too but at least that has smaller change though. This can be of 
course useful but am hesitant about the approach or the amount of changes.
    
    Since I don't have a better idea, one of them could be merged by someone 
else. I don't object.


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