Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/2070
Hi,
I wrote in the issue that you opened. This is a duplicate of
https://issues.apache.org/jira/browse/FLINK-3977 and the way to fix it is to
make `InternalWindowFunction` properly forward calls to `setOutputType`. If you
want, could you please change your fix to that and open a PR against the older
issue?
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