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https://issues.apache.org/jira/browse/FLINK-12081?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kurt Young closed FLINK-12081.
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Resolution: Implemented
Fix Version/s: 1.9.0
fixed in 518cf6a10ba105d655de738ce5fccc5fffc8e8a6
> Introduce aggregation operator code generator to blink batch
> ------------------------------------------------------------
>
> Key: FLINK-12081
> URL: https://issues.apache.org/jira/browse/FLINK-12081
> Project: Flink
> Issue Type: New Feature
> Components: Table SQL / Planner
> Reporter: Jingsong Lee
> Assignee: Jingsong Lee
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.9.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> 1.Introduce aggregation code generator without keys.
> 2.Introduce sort aggregation code generator to deal with all aggregate
> functions with keys. (Require input in keys order.)
> 3.Introduce hash aggregation code generator to deal with
> DeclarativeAggregateFunction and aggregateBuffers can be update(e.g.: setInt)
> in BinaryRow. (Hash Aggregate performs much better than Sort Aggregate)
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