[jira] [Closed] (CALCITE-4154) Add a rule to merge a Project onto an Aggregate

["Andrei Sereda (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-4154?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrei Sereda closed CALCITE-4154.
----------------------------------

Released as part of 1.25 ([68b02dfd4af15bc|https://github.com/apache/calcite/commit/68b02dfd4af15bc94a91a0cd2a30655d04439555])

> Add a rule to merge a Project onto an Aggregate
> -----------------------------------------------
>
>                 Key: CALCITE-4154
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4154
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Julian Hyde
>            Assignee: Julian Hyde
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.25.0
>
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> Add a rule to merge a {{Project}} onto an {{Aggregate}}. In practice, it means that aggregate functions that are not used in the Project are removed from the Aggregate.
> For example,
> {code:java}
> SELECT deptno, sum_sal
> FROM (
>   SELECT deptno, job, SUM(sal) AS sum_sal, MIN(ename) AS min_ename
>   FROM emp
>   GROUP BY deptno, job)
> {code}
> becomes
> {code:java}
> SELECT deptno, sum_sal
> FROM (
>   SELECT deptno, job, SUM(sal) AS sum_sal
>   FROM emp
>   GROUP BY deptno, job)
> {code}
> Note that {{min_ename}} is removed from the {{Aggregate}} (because it is not used by the {{Project}}). {{job}} is not used, but it remains because it is a {{GROUP BY}} key.



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