Github user hvanhovell commented on the pull request:

    https://github.com/apache/spark/pull/6416#issuecomment-142309139
  
    @MLnick I guess it depends. The other ```dataframe.stat``` functions have 
not been implemented as UDAFs, so this is not nessecary. However I do think 
that CMS is a usefull UDAF to have.


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