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Posted to issues@calcite.apache.org by "Zhenghua Gao (JIRA)" <ji...@apache.org> on 2017/01/06 03:45:58 UTC
[jira] [Commented] (CALCITE-1558) Wrong field mapping of top level
aggregate for cases when groupKey is used in aggregate function
[ https://issues.apache.org/jira/browse/CALCITE-1558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15803437#comment-15803437 ]
Zhenghua Gao commented on CALCITE-1558:
---------------------------------------
Created a pull request https://github.com/apache/calcite/pull/347 for this issue.
> Wrong field mapping of top level aggregate for cases when groupKey is used in aggregate function
> ------------------------------------------------------------------------------------------------
>
> Key: CALCITE-1558
> URL: https://issues.apache.org/jira/browse/CALCITE-1558
> Project: Calcite
> Issue Type: Bug
> Reporter: Zhenghua Gao
> Assignee: Julian Hyde
> Attachments: patch_1558.v1
>
>
> In AggregateExpandDistinctAggregatesRule.convertSingletonDistinct,
> if the groupKey is also used in some aggregate function,
> the field mappting of top level aggregate would be messy.
> Bad cases are:
> // Equivalent SQL:
> // SELECT deptno, COUNT(deptno), SUM(DISTINCT sal)
> // FROM emp
> // GROUP BY deptno
> // SELECT deptno, SUM(cnt), SUM(sal)
> // FROM
> // SELECT deptno, COUNT(deptno) AS cnt, sal
> // FROM emp
> // GROUP BY deptno, sal
> // GROUP BY deptno
> or a more complex case:
> // Equivalent SQL:
> // SELECT deptno, SUM(deptno), SUM(DISTINCT sal), MAX(deptno), MAX(comm)
> // FROM emp
> // GROUP BY deptno
> // SELECT deptno, SUM(sumOfInnerComm), SUM(sal), MAX(maxOfInnerDeptno), MAX(maxOfInnerComm)
> // FROM
> // SELECT deptno, sal, SUM(deptno) as sumOfInnerDeptno, MAX(deptno) as maxOfInnerDeptno, MAX(comm) AS maxOfInnerComm
> // FROM emp
> // GROUP BY deptno, sal
> // GROUP BY deptno
> I have fixed these cases, and will provide a patch later after more tests.
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