[jira] [Assigned] (FLINK-9959) Add JoinWindowFunction to allow access Window

["boshu Zheng (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-9959?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

boshu Zheng reassigned FLINK-9959:
----------------------------------

    Assignee: boshu Zheng

> Add JoinWindowFunction to allow access Window
> ---------------------------------------------
>
>                 Key: FLINK-9959
>                 URL: https://issues.apache.org/jira/browse/FLINK-9959
>             Project: Flink
>          Issue Type: Improvement
>          Components: DataStream API
>    Affects Versions: 1.5.1, 1.6.0
>            Reporter: Bowen Li
>            Assignee: boshu Zheng
>            Priority: Major
>             Fix For: 1.8.0
>
>
> e.g. currently, a windowed join looks like this, and the JoinFunction doesn't have access to the Window it runs against.
> {code:java}
> A.join(B)
> 	.where(...)
> 	.equalTo(...)
> 	.window(...)
> 	.apply(new JoinFunction<IN1, IN2, OUT>() {});
> {code}
> We can allow users to query window information by having
> {code:java}
> A.join(B)
> 	.where(...)
> 	.equalTo(...)
> 	.window(...)
> 	.apply(new JoinWindowFunction<IN1, IN2, OUT, Window>() {});
> {code}



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