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https://issues.apache.org/jira/browse/FLINK-4691?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15568261#comment-15568261
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ASF GitHub Bot commented on FLINK-4691:
---------------------------------------

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

    https://github.com/apache/flink/pull/2562#discussion_r82884874
  
    --- Diff: 
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/expressions/aggregations.scala
 ---
    @@ -18,12 +18,15 @@
     package org.apache.flink.api.table.expressions
     
     import org.apache.calcite.rex.RexNode
    +import org.apache.calcite.sql.`type`.{OperandTypes, ReturnTypes, 
SqlTypeName}
    --- End diff --
    
    Clean up imports


> 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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