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https://issues.apache.org/jira/browse/FLINK-10978?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hequn Cheng reassigned FLINK-10978:
-----------------------------------
Assignee: Hequn Cheng
> Add UnBounded FlatAggregate operator to batch Table API
> -------------------------------------------------------
>
> Key: FLINK-10978
> URL: https://issues.apache.org/jira/browse/FLINK-10978
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: sunjincheng
> Assignee: Hequn Cheng
> Priority: Major
> Fix For: 1.8.0
>
>
> Add FlatAggregate operator to batch Table API as described in [Google
> doc|https://docs.google.com/document/d/1tnpxg31EQz2-MEzSotwFzqatsB4rNLz0I-l_vPa5H4Q/edit#heading=h.q23rny2iglsr]
> .
> The usage:
> {code:java}
> val res = tab
> .groupBy('a) // leave out groupBy-clause to define global table aggregates
> .flatAgg(fun: TableAggregateFunction) // output has columns 'a, 'b, 'c
> .select('a, 'c)
> {code}
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