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https://issues.apache.org/jira/browse/FLINK-25595?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17488661#comment-17488661
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godfrey he commented on FLINK-25595:
------------------------------------

This is an invalid issue. HashAgg is the best choose if all the agg function 
has fixed-length agg buffer, otherwise SortAgg is the fallback choose. This is 
the current behavior in the planner. cc [~monster#12][~jingzhang]

> Specify hash/sort aggregate strategy in SQL hint
> ------------------------------------------------
>
>                 Key: FLINK-25595
>                 URL: https://issues.apache.org/jira/browse/FLINK-25595
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table SQL / Planner
>            Reporter: Jing Zhang
>            Assignee: ZhuoYu Chen
>            Priority: Major
>




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