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https://issues.apache.org/jira/browse/CALCITE-1447?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15593867#comment-15593867
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Julian Hyde commented on CALCITE-1447:
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Thanks; I'll take a look tomorrow.
> Support INTERSECT DISTINCT
> --------------------------
>
> Key: CALCITE-1447
> URL: https://issues.apache.org/jira/browse/CALCITE-1447
> Project: Calcite
> Issue Type: Sub-task
> Reporter: Pengcheng Xiong
> Assignee: Pengcheng Xiong
> Attachments: CALCITE-1447.01.patch
>
>
> Interesect distinct will be rewritten as
> {code}
> Rewrite: (GB-Union All-GB)-GB-FIL-Proj
> Example: R1 Intersect All R2
> R3 = GB(R1 on all attributes + count() as c) union all GB(R2 on all
> attributes + count() as c)
> R4 = GB(R3 on all attributes + count(c) as cnt)
> R5 = Fil ( cnt == #branch )
> R6 = Proj(R5 on all attributes)
> {code}
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