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https://issues.apache.org/jira/browse/CALCITE-7493?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yu Xu resolved CALCITE-7493.
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Fix Version/s: 1.43.0
Resolution: Fixed
Fixed in
[7e646c9|https://github.com/apache/calcite/commit/7e646c9c20fd29f41ad3ec393dc923c7cb1da6aa]
Thank you for the review [~mbudiu]
> Support constant-result aggregates (e.g., STDDEV_POP, STDDEV) over GROUP BY
> keys
> --------------------------------------------------------------------------------
>
> Key: CALCITE-7493
> URL: https://issues.apache.org/jira/browse/CALCITE-7493
> 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: 1.43.0
>
>
> Sql like：
> {code:java}
> select sal, stddev(sal) as sd,
> stddev_pop(sal) as sdp, var_pop(sal) as vp, var_samp(sal) as vs
> from emp group by sal, deptno {code}
>
> It should be able to be optimized to:
> ||agg funcions||Better simplified results||
> |{{STDDEV(sal)}}|{{0}}|
> |{{STDDEV_POP(sal)}}|{{0}}|
> and current plan:
> {code:java}
> LogicalProject(SAL=[$0], SD=[$3], SDP=[$4], VP=[$5], VS=[$6])
> LogicalAggregate(group=[{0, 1}], SD=[STDDEV($0)], SDP=[STDDEV_POP($0)],
> VP=[VAR_POP($0)], VS=[VAR_SAMP($0)])
> LogicalProject(SAL=[$5], DEPTNO=[$7])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]]) {code}
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