Github user twalthr commented on the issue:
https://github.com/apache/flink/pull/2562
Thanks for reviewing this PR @fhueske. I hope I could fix all the feedback
you gave me. I also added documentation for the website in my last commit.
Regarding the two big changes you mentioned:
1. IMHO window properties also summarize the data. So they can be
considered as an aggregation of the data in a window. I also chose this
approach to keep the code clean and readable (window properties and
aggregations have more in common than window properties and grouping keys).
Otherwise we have to somehow hack the window property into the record after the
aggregation happened. I will try to improve this but I'm not sure if the
outcome will be a nicer solution.
2. Once #2595 is merged I will rebase this PR and convert ITCases to unit
tests.
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