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https://issues.apache.org/jira/browse/FLINK-3977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15323085#comment-15323085
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RWenden commented on FLINK-3977:
--------------------------------
I'm not familiar to the Flink framework internals (yet) and I think it's too
tricky for me to solve this, right now. I quit for this moment.
Any volunteers?
> Subclasses of InternalWindowFunction must support OutputTypeConfigurable
> ------------------------------------------------------------------------
>
> Key: FLINK-3977
> URL: https://issues.apache.org/jira/browse/FLINK-3977
> Project: Flink
> Issue Type: Bug
> Components: Streaming
> Reporter: Aljoscha Krettek
> Priority: Critical
>
> Right now, if they wrap functions and a wrapped function implements
> {{OutputTypeConfigurable}}, {{setOutputType}} is never called. This manifests
> itself, for example, in FoldFunction on a window with evictor not working.
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