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https://issues.apache.org/jira/browse/FLINK-30242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17641107#comment-17641107
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Runkang He commented on FLINK-30242:
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We have already done this work, and have a presentation in FFA 2022 a few days
ago, we will try to bring back it to the community.
> Push localHashAggregate pass the union node
> -------------------------------------------
>
> Key: FLINK-30242
> URL: https://issues.apache.org/jira/browse/FLINK-30242
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Planner
> Reporter: Aitozi
> Priority: Major
>
> The local hash aggregate after union will have an extra shuffle stage. We can
> swap it with the union node so the local hash aggregate can chain with the
> mapper stage saving the unnecessary shuffle, especially in the batch job.
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