xiong duan created CALCITE-6945:
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Summary: 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
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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