Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/3285
@VenturaDelMonte I opened this:
https://issues.apache.org/jira/browse/FLINK-5740. I want to make
`WrappingFunction` an interface because, as you noted,
`RichProcessWindowFunction` does currently not work.
I would merge this then. If you want you can pick up the work on the
all-window case again and carry it to an end in the same way. What do you think?
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