Github user sun-rui commented on the pull request:

    https://github.com/apache/spark/pull/12836#issuecomment-219621230
  
    @felixcheung, could you demonstrate your thought more clearly? I am not 
sure If I understand it. this PR aims to allow applying an R function on 
groups, while agg is pre-defined functionality and involves no user-supplied 
code.


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