ASF GitHub Bot commented on FLINK-4691:

Github user twalthr commented on the issue:

    @fhueske I updated the PR. The only thing that is missing now are tests for 
the `DataStreamAggregate` class. I will add unit tests tomorrow.

> Add group-windows for streaming tables        
> ---------------------------------------
>                 Key: FLINK-4691
>                 URL: https://issues.apache.org/jira/browse/FLINK-4691
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table API & SQL
>            Reporter: Timo Walther
>            Assignee: Timo Walther
> Add Tumble, Slide, Session group-windows for streaming tables as described in 
> [FLIP-11|https://cwiki.apache.org/confluence/display/FLINK/FLIP-11%3A+Table+API+Stream+Aggregations].
> Implementation of group-windows on streaming tables. This includes 
> implementing the API of group-windows, the logical validation for 
> group-windows, and the definition of the “rowtime” and “systemtime” keywords. 
> Group-windows on batch tables won’t be initially supported and will throw an 
> exception.

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