Github user yhuai commented on the pull request:

    https://github.com/apache/spark/pull/7583#issuecomment-124569702
  
    @cloud-fan I am probably missing the context at here. What's the problem 
(and why we need to revert #4169)? Do you mean that the old and new aggregation 
code path have different output schema when `retainGroupColumns` is true (one 
has literals and one does not literals?)? Can you give an example and explain 
what is the difference? It is also good to provide details about the problem 
(what is the symptom and what is the root cause) in the description, which can 
help other people understand the problem when they look at commit history.


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