Benchao Li created CALCITE-5717:
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Summary: Prune Project's input if project has no InputRef and the
input has 1 row
Key: CALCITE-5717
URL: https://issues.apache.org/jira/browse/CALCITE-5717
Project: Calcite
Issue Type: Improvement
Components: core
Reporter: Benchao Li
Assignee: Benchao Li
The idea is to improve SQL
{code:sql}
select 1 from emps group ()
{code}
In this case, we can safely prune the Aggregate.
This idea is brought up in the discussion of CALCITE-5506
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