Github user cjolif commented on the issue:
https://github.com/apache/flink/pull/3034
@aljoscha
We regularly empty the window because we can get lengthy windows with a lot
of elements, so it is good get rid of elements we already managed. But then if
we have no more elements and the window event time is triggered it does fire
the window function.
When we will get some spare cycle we are going to give a try to it as you
seem to have fix that according to the JIRA issue?
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