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https://issues.apache.org/jira/browse/FLINK-6334?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ruidong Li reassigned FLINK-6334:
---------------------------------

    Assignee: Ruidong Li

> Refactoring UDTF interface
> --------------------------
>
>                 Key: FLINK-6334
>                 URL: https://issues.apache.org/jira/browse/FLINK-6334
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API & SQL
>            Reporter: Ruidong Li
>            Assignee: Ruidong Li
>
> The current UDTF leverages the table.join(expression) interface, which is not 
> a proper interface in terms of semantics. We would like to refactor this to 
> let UDTF use table.join(table) interface. Very briefly,  UDTF's apply method 
> will return a Table Type, so Join(UDTF('a, 'b, ...) as 'c) shall be viewed as 
> join(Table)



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