Github user vanzin commented on the issue:

    https://github.com/apache/spark/pull/18004
  
    Sorry, forgot one comment.
    
    > With what you propose, the implementation will be much more complex and I 
think that it is not valuable yet while there is no concrete need of this 
mechanism.
    
    Yes, the implementation might become a little more complex (I disagree with 
"much more"), but as I've tried to say multiple times, there are concrete needs 
and it's a much better solution to the more general problem. 
    
    It also happens to make the code more unit testable by isolating that 
behavior in a separate class.



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