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https://issues.apache.org/jira/browse/CALCITE-2490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16594157#comment-16594157
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Julian Hyde commented on CALCITE-2490:
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OK in principle. However, cost:benefit. Let's not spend more developer time on
this than users are likely to spend. We don't promise a bug-free product.
> Wrong results when grouping set is repeated
> -------------------------------------------
>
> Key: CALCITE-2490
> URL: https://issues.apache.org/jira/browse/CALCITE-2490
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.17.0
> Reporter: Vladimir Sitnikov
> Assignee: Julian Hyde
> Priority: Major
>
> The following query produces 2 rows in PostgreSQL and just one in Calcite
> {code:sql}select count(*)
> from (select * from (values(1)) as t(a))
> group by grouping sets ((a), (a)){code}
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