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https://issues.apache.org/jira/browse/FLINK-12098?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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godfrey he updated FLINK-12098:
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Summary: Add support for generating optimized logical plan for simple group
aggregate on stream (was: Add support for generating optimized logical plan
for simple group aggregate on batch)
> Add support for generating optimized logical plan for simple group aggregate
> on stream
> --------------------------------------------------------------------------------------
>
> 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
> Priority: Major
>
> 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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