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https://issues.apache.org/jira/browse/FLINK-5740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15894168#comment-15894168
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Aljoscha Krettek commented on FLINK-5740:
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I didn't yet find time to work on this. If you're interested,
[~sunjincheng121], you can take it over.
> Make WrappingFunction an interface and move to flink-core
> ---------------------------------------------------------
>
> Key: FLINK-5740
> URL: https://issues.apache.org/jira/browse/FLINK-5740
> Project: Flink
> Issue Type: Improvement
> Components: Core
> Reporter: Aljoscha Krettek
> Assignee: Aljoscha Krettek
> Priority: Blocker
> Fix For: 1.3.0
>
>
> Making it an interface and having an {{AbstractWrappingFunction}} will allow
> implementations to have different classes as base classes. Also, we should
> change {{FunctionUtils}} to work like {{StreamingFunctionUtils}} so that
> wrapping functions don't have to implement the methods of {{RichFunction}}.
> These tests are disabled for now because we cannot properly implement the
> required features:
> - WindowFoldITCase.testFoldWithProcessWindowFunction() (Scala)
> - WindowFunctionITCase.testRichProcessWindowFunction() (Scala)
> - WindowReduceITCase.testReduceWithProcessWindowFunction (Scala)
> Because of the ignored tests I'm updating to "blocker".
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