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Posted to issues@flink.apache.org by "sunjincheng (JIRA)" <ji...@apache.org> on 2017/04/26 23:14:04 UTC
[jira] [Updated] (FLINK-6392) Change the alias of Window from
optional to essential.
[ https://issues.apache.org/jira/browse/FLINK-6392?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
sunjincheng updated FLINK-6392:
-------------------------------
Issue Type: Sub-task (was: Improvement)
Parent: FLINK-4557
> 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:
> {code}
> tab //Table('a,'b,'c)
> .window( Slide over 10.milli every 5.milli as 'w)
> .groupBy('w,'a,'b) // WindowGroupedTable
> .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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