Github user marmbrus commented on the pull request:

    https://github.com/apache/spark/pull/3381#issuecomment-67383123
  
    Hi @adrian-wang, thanks for working on this and I'm very sorry for letting 
it fall out of date.  In general this seems like a reasonable change to make, 
but we do need to be very careful that we don't change the output types as 
those are part of the public API.  I could be wrong, but it doesn't seem like 
we are doing that now.
    
    So I propose the following:
     - Close this issue for now, and reopen it once it has been updated.  (we 
are trying very hard to keep the PR queue small and limited to active PRs so 
that things don't fall through the cracks).
     - Add tests to scala/java/python to make sure we are not changing the 
types that are output.
    
    What do you think?


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