Github user ggevay commented on the pull request:
https://github.com/apache/flink/pull/684#issuecomment-110739389
I did the Scala part, and added a Jira (FLINK-2145).
As for the placement:
@StephanEwen:
> I think we should put the code into a streaming operator library. The
streaming core is undergoing heavy changes, the windowing may be reworked in
the near future, and there are plans to use managed memory for window buffer
contents.
I am not sure how putting this into a separate library helps a future
refactoring of windowing. Most of the median code is inside the new
PreReducers, so it is probably already separated from the rest of the code as
well as it can be.
(Also, if you are worried about bloating the API for the users, I don't
think median would hurt in that respect either: the function of a method named
"median" should be pretty clear to the users.)
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