Hequn Cheng commented on FLINK-8594:

Then let me terminate the FLINK-8566 :)

> Make producesUpdates in DataStreamGroupAggregate return false if it is a 
> distinct group by without state retention configuration 
> ---------------------------------------------------------------------------------------------------------------------------------
>                 Key: FLINK-8594
>                 URL: https://issues.apache.org/jira/browse/FLINK-8594
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API & SQL
>            Reporter: Hequn Cheng
>            Assignee: Hequn Cheng
>            Priority: Major
> Internally, the {{DISTINCT}} is translated into a {{GROUP BY}} with all 
> distinct fields being keys and no aggregation functions. However, this kind 
> of \{{GROUP BY}} don't generate update at all if the state retention time has 
> not been configured. We can treat the result table as an append table. 
> Therefore, we can make the \{{producesUpdates}} function return false, so the 
> downstream group by will not choose the correspond retract agg function, 
> i.e., {{MaxWithRetractAggFunction}}

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