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https://issues.apache.org/jira/browse/CALCITE-1448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15592961#comment-15592961
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Julian Hyde commented on CALCITE-1448:
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Ah yes, missed that. Good one!
> Add rules to flatten and prune Intersect and Minus
> --------------------------------------------------
>
> Key: CALCITE-1448
> URL: https://issues.apache.org/jira/browse/CALCITE-1448
> Project: Calcite
> Issue Type: Sub-task
> Reporter: Pengcheng Xiong
> Assignee: Julian Hyde
> Fix For: 1.11.0
>
>
> similar to current unionMergeRule.
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