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https://issues.apache.org/jira/browse/FLINK-6392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15986554#comment-15986554
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ASF GitHub Bot commented on FLINK-6392:
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Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/3786
Thanks for the PR @sunjincheng121 and all refactoring!
Will change some class names and merge it.
> Change the alias of Window from optional to essential.
> ------------------------------------------------------
>
> Key: FLINK-6392
> URL: https://issues.apache.org/jira/browse/FLINK-6392
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Affects Versions: 1.3.0
> Reporter: sunjincheng
> Assignee: sunjincheng
> Fix For: 1.3.0
>
>
> Currently, The window clause use case looks like as following:
> {code}
> tab //Table('a,'b,'c)
> .window( Slide over 10.milli every 5.milli as 'w)
> .groupBy('w,'a,'b)
> .select('a, 'b, 'c.sum, 'w.start, 'w.end)
> {code}
> As we see the alias of window is essential. But the current implementation of
> the TableAPI does not have the constraint for the alias,So we must
> refactoring the API definition using TYPE SYSTEM lead to constraint for the
> alias.
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