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https://issues.apache.org/jira/browse/FLINK-6334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15995546#comment-15995546
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ASF GitHub Bot commented on FLINK-6334:
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Github user asfgit closed the pull request at:
https://github.com/apache/flink/pull/3791
> 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
> Priority: Blocker
> Fix For: 1.3.0
>
>
> 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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