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https://issues.apache.org/jira/browse/CALCITE-7579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18086006#comment-18086006
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Chloe Zhang commented on CALCITE-7579:
--------------------------------------
https://github.com/apache/calcite/pull/4990
> REGR_COUNT arguments are dropped in RelNode
> -------------------------------------------
>
> Key: CALCITE-7579
> URL: https://issues.apache.org/jira/browse/CALCITE-7579
> Project: Calcite
> Issue Type: Bug
> Reporter: Chloe Zhang
> Assignee: Chloe Zhang
> Priority: Major
>
> When parses {{REGR_COUNT(y, x)}} the SqlKind is mistakenly set to
> {{SqlKind.COUNT}} instead of {{{}SqlKind.REGR_COUNT{}}}, the agg builder then
> drop the args {{y}} and {{x}} and replace with {{{}*{}}}, leading to empty
> arg list of the agg call at RelNode stage.
> A way to repro it is, parse and plan it, then convert it back to SQL, it
> would be:
> REGR_COUNT(y, x) -> REGR_COUNT(*)
> which is semantically incorrect
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