Yu Xu created CALCITE-7492:
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Summary: Support deterministic expressions involving only GROUP BY
keys as aggregate arguments
Key: CALCITE-7492
URL: https://issues.apache.org/jira/browse/CALCITE-7492
Project: Calcite
Issue Type: Bug
Components: core
Affects Versions: 1.41.0
Reporter: Yu Xu
Sql like：
{code:java}
select sal, max(sal + 1) as max_plus from emp group by sal, deptno {code}
It should be optimized as follows (the calculation of the aggregate function
max is not necessary)：
{code:java}
select sal, sal + 1 as max_plus from emp group by sal, deptno {code}
and current plan:
{code:java}
LogicalProject(SAL=[$0], MAX_PLUS=[$2])
LogicalAggregate(group=[{0, 1}], MAX_PLUS=[MAX($2)])
LogicalProject(SAL=[$5], DEPTNO=[$7], $f2=[+($5, 1)])
LogicalTableScan(table=[[CATALOG, SALES, EMP]]) {code}
it may be optimized.
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