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https://issues.apache.org/jira/browse/FLINK-3977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15335763#comment-15335763
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ASF GitHub Bot commented on FLINK-3977:
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Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/2118
LGTM!
> 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
> Assignee: Fabian Hueske
> 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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