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https://issues.apache.org/jira/browse/FLINK-13854?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Metzger updated FLINK-13854:
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Component/s: API / DataStream
> Support Aggregating in Join and CoGroup
> ---------------------------------------
>
> Key: FLINK-13854
> URL: https://issues.apache.org/jira/browse/FLINK-13854
> Project: Flink
> Issue Type: New Feature
> Components: API / DataStream
> Affects Versions: 1.9.0
> Reporter: Jiayi Liao
> Priority: Major
>
> In WindowStream we can use windowStream.aggregate(AggregateFunction,
> WindowFunction) to aggregate input records in real-time.
> I think we should support similar api in JoinedStreams and CoGroupStreams,
> because it's a very huge cost by storing the records log in state backend,
> especially when we don't need the specific records.
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