Github user HyukjinKwon commented on the issue:

    https://github.com/apache/spark/pull/21427
  
    How about we just start to have configurations classified for each version 
if it sounds better to have configurations for each behaviour change? For 
example, we could have postfix like spark_23 in the configuration name. Once we 
properly set this, I think this should get rid of all such overhead like this.
    
    For now, I am less sure what we are making it configurable. You guys really 
think https://github.com/apache/spark/pull/21427#issuecomment-393351811 makes 
any sense? This isn't really purely positional vs vs named now. See 
https://github.com/apache/spark/pull/21427#issuecomment-392070950, this 
actually covers both cases.


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