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https://issues.apache.org/jira/browse/FLINK-5963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15901518#comment-15901518
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ASF GitHub Bot commented on FLINK-5963:
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Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/3472
Thanks for the reviews @shaoxuan-wang and @sunjincheng121.
Will merge this PR
> Remove preparation mapper of DataSetAggregate
> ---------------------------------------------
>
> Key: FLINK-5963
> URL: https://issues.apache.org/jira/browse/FLINK-5963
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Affects Versions: 1.3.0
> Reporter: Fabian Hueske
> Assignee: Fabian Hueske
> Priority: Minor
>
> With the new UDAGG interface we do not need the preparation mapper anymore.
> It adds overhead because
> - it is another operator
> - it prevents to use {{AggregateFunction.accumulate()}} in a combiner or
> reducer.
> Hence, it should be removed.
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