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https://issues.apache.org/jira/browse/FLINK-8689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16389561#comment-16389561
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ASF GitHub Bot commented on FLINK-8689:
---------------------------------------

Github user hequn8128 commented on the issue:

    https://github.com/apache/flink/pull/5555
  
    @walterddr Cool, thanks for your update. I will take a look during this 
weekend or early next week :-)


> Add runtime support of distinct filter using MapView 
> -----------------------------------------------------
>
>                 Key: FLINK-8689
>                 URL: https://issues.apache.org/jira/browse/FLINK-8689
>             Project: Flink
>          Issue Type: Sub-task
>            Reporter: Rong Rong
>            Assignee: Rong Rong
>            Priority: Major
>
> This ticket should cover distinct aggregate function support to codegen for 
> *AggregateCall*, where *isDistinct* fields is set to true.
> This can be verified using the following SQL, which is not currently 
> producing correct results.
> {code:java}
> SELECT
>   a,
>   SUM(b) OVER (PARTITION BY a ORDER BY proctime ROWS BETWEEN 5 PRECEDING AND 
> CURRENT ROW)
> FROM
>   MyTable{code}
>  
>  



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