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https://issues.apache.org/jira/browse/CALCITE-1448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15583883#comment-15583883
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Julian Hyde commented on CALCITE-1448:
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Ah, I see, "intersect merge" is not syntax, it is a planner rule. Makes sense.
> Add a rule to merge INTERSECT with its children INTERSECT
> ---------------------------------------------------------
>
> Key: CALCITE-1448
> URL: https://issues.apache.org/jira/browse/CALCITE-1448
> Project: Calcite
> Issue Type: Sub-task
> Reporter: Pengcheng Xiong
> Assignee: Pengcheng Xiong
>
> similar to current unionMergeRule.
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