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https://issues.apache.org/jira/browse/FLINK-7986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16240113#comment-16240113
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Fabian Hueske commented on FLINK-7986:
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Yes, this rule makes a lot of sense.
> Introduce FilterSetOpTransposeRule to Flink
> -------------------------------------------
>
> Key: FLINK-7986
> URL: https://issues.apache.org/jira/browse/FLINK-7986
> Project: Flink
> Issue Type: Improvement
> Reporter: Ruidong Li
> Assignee: Ruidong Li
> Priority: Trivial
>
> A.unionAll(B).where.groupBy.select
> =>
> A.where.unionAll(B.where).groupBy.select
> this rule will reduce networkIO
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