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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