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https://issues.apache.org/jira/browse/FLINK-4692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15817829#comment-15817829
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ASF GitHub Bot commented on FLINK-4692:
---------------------------------------

Github user twalthr commented on the issue:

    https://github.com/apache/flink/pull/2938
  
    Thanks for fixing the bug. The collection execution mode is on purpose 
because we have too many IT cases at the moment. We should only test the 
subclasses of `FlinkRel` like `DataSetUnion`, `DataStreamAggregate` etc. with 
IT cases. Once this is the case we can reenable the cluster mode.


> Add tumbling group-windows for batch tables
> -------------------------------------------
>
>                 Key: FLINK-4692
>                 URL: https://issues.apache.org/jira/browse/FLINK-4692
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table API & SQL
>            Reporter: Timo Walther
>            Assignee: Jark Wu
>
> Add Tumble group-windows for batch tables as described in 
> [FLIP-11|https://cwiki.apache.org/confluence/display/FLINK/FLIP-11%3A+Table+API+Stream+Aggregations].
>  



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