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https://issues.apache.org/jira/browse/CALCITE-6945?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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xiong duan resolved CALCITE-6945.
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Fix Version/s: 1.40.0
Resolution: Fixed
> Use LITERAL_AGG to simplify SubQueryRemoveRule by avoiding the extra Project
> -----------------------------------------------------------------------------
>
> Key: CALCITE-6945
> URL: https://issues.apache.org/jira/browse/CALCITE-6945
> Project: Calcite
> Issue Type: Bug
> Reporter: xiong duan
> Assignee: xiong duan
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.40.0
>
>
> For example, when rewriting sub-queries (see {{{}SubQueryRemoveRule{}}}) we
> introduce add "true as indicator" to the SELECT clause of sub-queries. It can
> be used to detect rows generated by an outer join. If it is an aggregate
> query, we would have to write "min(true) as indicator", which necessitates an
> extra {{Project}} below the {{Aggregate}} to provide the "true" value. The
> LITERAL_AGG aggregate function allows us to avoid the extra {{{}Project{}}}.
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