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From "sunjincheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-6228) Integrating the OVER windows in the Table API
Date Wed, 05 Apr 2017 14:46:41 GMT

    [ https://issues.apache.org/jira/browse/FLINK-6228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15956964#comment-15956964
] 

sunjincheng commented on FLINK-6228:
------------------------------------

Yes, Your right In SQL we should be consistent with the standard SQL semantics, I also think
in SQL we only support over with {{OverWindow}} just like current master code. About {{OverWindow}}
with {{groupBy}} , it's a little confused. Current tableAPI SlideWindow defined both 
window size and trigger frequency, e.g.: {{Slide over 2.rows every 1.rows }},So {{over}} with
{{sideWindow}} dose not make sense at current time.But how can we using overWindow expression
{{Tumble over 5.rows }} ?

> Integrating the OVER windows in the Table API
> ---------------------------------------------
>
>                 Key: FLINK-6228
>                 URL: https://issues.apache.org/jira/browse/FLINK-6228
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table API & SQL
>            Reporter: sunjincheng
>            Assignee: sunjincheng
>
> Syntax:
> {code}
> table
>    .overWindows(
>     (Rows|Range [ partitionBy value_expression , ... [ n ]] [ orderBy order_by_expression]

>       (preceding  UNBOUNDED|value_specification.(rows|milli|second|minute|hour|day|month|year)|CURRENTROW)
>      [following UNBOUNDED|value_specification.(rows|milli|second|minute|hour|day|month|year)|CURRENTROW]
>     as alias,...[n])
>    )
>   .select( [col1,...[n]], (agg(col1) OVER overWindowAlias, … [n])
> {code}
> Implement restrictions:
> * All OVER clauses in the same SELECT clause must be exactly the same.
> * The PARTITION BY clause is optional (no partitioning results in single threaded execution).
> * The ORDER BY Before the [FLINK-5884|https://issues.apache.org/jira/browse/FLINK-5884]
 implementation orderBy may only have ‘rowtime/’proctime(for stream)/‘specific-time-field(for
batch).
> * FOLLOWING is not supported.
> I will soon add a user interface design document.



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