Aljoscha Krettek created FLINK-3977:
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Summary: 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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