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https://issues.apache.org/jira/browse/FLINK-7776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16198952#comment-16198952
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ASF GitHub Bot commented on FLINK-7776:
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Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/4785
Merging
> do not emit duplicated records in group aggregation
> ---------------------------------------------------
>
> Key: FLINK-7776
> URL: https://issues.apache.org/jira/browse/FLINK-7776
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Ruidong Li
> Assignee: Ruidong Li
>
> the current group aggregation will compare the last {{Row}} and current
> {{Row}} when {{generateRetraction}} is {{true}} and {{firstRow}} is {{false}}
> in {{GroupAggProcessFunction}},
> this logic should be applied to all cases when {{firstRow}} is false, if
> current {{Row}} is same with previous {{Row}}, we do not emit any records.
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