Github user wangyangjun commented on the pull request:
https://github.com/apache/flink/pull/1527#issuecomment-199043205
Hi StephanEwen, sorry for replying this late.
This will join two window streams as long as slide size of these two
windows are equal. It can be two SlidingTimeWindows, one SlidingTimeWindow and
one TumblingTimeWindow. If slide size of windows are not equal, an exception
will be threw.
It doesn't support generic windows and triggers yet. Only TimeWindow is
allowed in the API.
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