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

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

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

ASF GitHub Bot updated CALCITE-4154:
------------------------------------
    Labels: pull-request-available  (was: )

> 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
>          Time Spent: 10m
>  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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