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https://issues.apache.org/jira/browse/FLINK-5740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15978777#comment-15978777
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Tzu-Li (Gordon) Tai commented on FLINK-5740:
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I can take on this issue next week
> 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: Tzu-Li (Gordon) Tai
> 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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