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https://issues.apache.org/jira/browse/FLINK-30242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17641111#comment-17641111
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Aitozi commented on FLINK-30242:
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Hi [~Runking], Sorry I have not noticed that. If you have already done, you can
take this ticket :)
BTW, can you share your presentation link, I'd like to take a look
> 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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