[jira] [Created] (FLINK-12098) Add support for generating optimized logical plan for simple group aggregate on batch

[Shang Yuanchun (Jira)]

godfrey he created FLINK-12098:
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             Summary: Add support for generating optimized logical plan for simple group aggregate on batch
                 Key: FLINK-12098
                 URL: https://issues.apache.org/jira/browse/FLINK-12098
             Project: Flink
          Issue Type: New Feature
          Components: Table SQL / Planner
            Reporter: godfrey he
            Assignee: godfrey he


This issue only involves simple stream group aggregate, complex group aggregate(including GROUP SETS and DISTINCT) will also be finished in new issue.

A logical aggregate will be converted to StreamExecGroupAggregate, and a StreamExecGroupAggregate will be written to two-stage aggregates (StreamExecLocalGroupAggregate and StreamExecGlobalGroupAggregate) if mini-batch is enabled and all aggregate functions are mergeable.

Retraction rules will also be ported, because multiple level aggregates will produce retraction message.




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