weihua zhang created CALCITE-7242:
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Summary: implement a rule to get rid of the LITERAL_AGG into other
database can handle
Key: CALCITE-7242
URL: https://issues.apache.org/jira/browse/CALCITE-7242
Project: Calcite
Issue Type: Improvement
Components: core
Reporter: weihua zhang
Calcite can create an Aggregate RelNode with a single LITERAL_AGG AggregateCall
to check for existence in a subquery. In this case, the Aggregate will do a
group by, and just spit out a literal value for each row.
The LITERAL_AGG function does not exist in other databases. In order to create
a RelNode structure that other databases supports, this Aggregate is turned
into an Aggregate that still does the "group by" on the relevant groups, but
places a Project RelNode on top that returns the literal value.
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