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https://issues.apache.org/jira/browse/FLINK-12401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16846681#comment-16846681
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Hequn Cheng commented on FLINK-12401:
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[~jark] Hi, incremental emit under AccRetract mode has been covered by
[Flip-29|https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=97552739].
The `emitValueWithRetract` method will be used to emit incremental
values(under AccRetract mode). There are also some examples in the doc. The
`emitValueWithRetract` method will be used in preference to the `emitValue`
method as it is considered to be more efficient.
> Support incremental emit for non-window streaming FlatAggregate on Table API
> ----------------------------------------------------------------------------
>
> Key: FLINK-12401
> URL: https://issues.apache.org/jira/browse/FLINK-12401
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / API
> Reporter: Hequn Cheng
> Assignee: Hequn Cheng
> Priority: Major
>
> As described in
> [Flip-29|https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=97552739],
> there are two output modes for non-window streaming flatAggregate. One is
> emitting with full values, the other is emitting with incremental values.
> [FLINK-10977|https://issues.apache.org/jira/browse/FLINK-10977] supports the
> former one, this jira is going to support the latter one.
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