Github user maropu commented on the issue:

    https://github.com/apache/spark/pull/22332
  
    I also can't find a strong reason to append a new API in `Dataset`... btw, 
to add a new API there, you'd be better to discuss in jira before making a pr, 
I think. cc: @rxin @cloud-fan @HyukjinKwon 


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