Github user cloud-fan commented on the issue:

    https://github.com/apache/spark/pull/18849
  
    My main concern is, we should not change the write path if not necessary. 
For backward compatibility, the read path needs to handle all possible cases, 
and changing write path just adds more complexity to the read path.
    
    To be clear, if there are some new features that have to be implemented by 
some write path changes, we should do it. If you only wanna clean something up, 
changing the write path can only make it worse.


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