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https://issues.apache.org/jira/browse/CALCITE-5420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17643609#comment-17643609
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Julian Hyde commented on CALCITE-5420:
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This feature sounds important and useful. But can you refresh my memory: is
there any other decorrelation code besides SqlToRelConverter? I have a feeling
that there are some planner rules. If so, do those already work, or could this
work be done there?
> SqlToRel should populate projects corralate id 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
>
> The following query does not populate correlate id in the project:
> {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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