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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-6334) Refactoring UDTF interface
Date Fri, 28 Apr 2017 06:27:04 GMT

    [ https://issues.apache.org/jira/browse/FLINK-6334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15988284#comment-15988284

ASF GitHub Bot commented on FLINK-6334:

Github user sunjincheng121 commented on the issue:

    HI @Xpray Thanks for the update. I think the PR is in a pretty good shape for me. Except
for the name of `TableFunctionConversions`.  looking forward to @fhueske 's opinion.

> 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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