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https://issues.apache.org/jira/browse/CALCITE-7492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yu Xu resolved CALCITE-7492.
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Fix Version/s: 1.42.0
Resolution: Fixed
Fixed in
[068c03d|https://github.com/apache/calcite/commit/068c03dfcc37798acfe60a369149888a97f1ba8c]
Thank you for the review [~mbudiu]
> Support expression that has a constant value within the group involving only
> GROUP BY keys as aggregate arguments
> -----------------------------------------------------------------------------------------------------------------
>
> Key: CALCITE-7492
> URL: https://issues.apache.org/jira/browse/CALCITE-7492
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.41.0
> Reporter: Yu Xu
> Assignee: Yu Xu
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.42.0
>
>
> 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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