Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/6104#issuecomment-101524536
Oh, actually it was my bad, the `over` should be a independent function
call, not a method of `Column`.
The window definition should be quite independent also, and it can be given
a name, as @rxin said, it would be simpler if accommodating multiple functions.
And, it would be easier to create functions(aggregate/window function) via the
object `WindowFunctionDefinition` instead of the `DataFrame`, right?
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