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https://issues.apache.org/jira/browse/FLINK-3977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15318161#comment-15318161
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Aljoscha Krettek commented on FLINK-3977:
-----------------------------------------
The way to solve this is to make subclasses of {{InternalWindowFunction}}
extends {{OutputTypeConfigurable}}. When {{setOutputType()}} is called these
must check whether the wrapped function is {{OutputTypeConfigurable}} and
forward the call.
> 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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