Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/1527#issuecomment-195495184
I just saw that you updated this pull request (actually a few weeks ago
already)
A lot of it looks very good, some things we need to check a bit deeper
(like how triggers actually behave on the two separate windows, how windows are
matched).
Can you give a high level summary of how this should behave?
Especially given that you allow for custom triggers and window assigners
here, how are windows matched against each other (to determine that their
elements should be joined/co-grouped).
For tumbling time windows, the behavior is well defined and like discussed
in the JIRA issue, but for generic windows and triggers, how is it defined?
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