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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