Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/6104#issuecomment-101551800
@chenghao-intel - I think it's better to follow SQL more closely here. I
don't think it is much harder to write multiple aggregates, since the user can
easily just add a function to create the window statement. On the contrary, it
is more clear how many aggregates we are applying if we put this in the front.
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