ASF GitHub Bot commented on FLINK-4691:

Github user fhueske commented on a diff in the pull request:

    --- Diff: 
    @@ -23,6 +23,8 @@ import org.apache.flink.api.table.Row
     import java.math.BigDecimal
     import java.math.BigInteger
    +import org.apache.flink.streaming.api.windowing.windows.Window
    --- End diff --
    Please undo the reformatting changes and unnecessary import on this file. 
Please check the other `Aggregate` implementations as well.

> 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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