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https://issues.apache.org/jira/browse/CALCITE-4748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17402706#comment-17402706
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Julian Hyde commented on CALCITE-4748:
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After CALCITE-1824, we apply {{RelBuilder.rewriteAggregateWithGroupId}} only
when there is a call to the {{GROUP_ID}} function. I think we need to apply the
same logic if there are duplicate grouping sets, even if {{GROUP_ID}} is not
present.
> duplicate columnName in grouping sets get the wrong result
> ----------------------------------------------------------
>
> Key: CALCITE-4748
> URL: https://issues.apache.org/jira/browse/CALCITE-4748
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.27.0
> Reporter: duan xiong
> Assignee: duan xiong
> Priority: Critical
>
> When run SQL1:
> {code:java}
> select prod_id from foodmart.sales_fact_1997 as s group by grouping
> sets(prod_id,prod_id){code}
> and SQL2:
> {code:java}
> select prod_id from foodmart.sales_fact_1997 as s group by grouping
> sets(prod_id){code}
> get the SAME result. This is wrong. SQL1 return result's number = SQL2 return
> result*2 number
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