[jira] [Created] (FLINK-8594) Make producesUpdates in DataStreamGroupAggregate return false if it is a distinct group by without state retention configuration

[Shang Yuanchun (Jira)]

Hequn Cheng created FLINK-8594:
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             Summary: 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


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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