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https://issues.apache.org/jira/browse/CALCITE-5420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18102338#comment-18102338
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Yu Xu commented on CALCITE-5420:
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I had add a test case to cover it: https://github.com/apache/calcite/pull/5159
> SqlToRel should populate the correlate id of a Project for queries with
> aggregates
> ----------------------------------------------------------------------------------
>
> Key: CALCITE-5420
> URL: https://issues.apache.org/jira/browse/CALCITE-5420
> Project: Calcite
> Issue Type: Bug
> Reporter: James Starr
> Assignee: James Starr
> Priority: Major
> Labels: pull-request-available
>
> The following query does not populate correlate id in the project when
> SqlToRel.expand=false:
> {code:sql}
> SELECT SUM(
> (select char_length(dname) from "scott".dept where dept.deptno =
> emp.empno)) as s
> FROM "scott".emp
> {code}
> Having the correlate id populated is important for expanding nested queries.
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