[jira] [Created] (FLINK-3977) Subclasses of InternalWindowFunction must support OutputTypeConfigurable

[Shang Yuanchun (Jira)]

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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