[jira] [Commented] (CALCITE-1583) Wrong results for query with correlated subqueries with aggregate subquery expression

["Julian Hyde (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-1583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15827246#comment-15827246 ] 

Julian Hyde commented on CALCITE-1583:
--------------------------------------

[~vgarg], Can you give examples of scalar and IN sub-queries where this occurs?

> Wrong results for query with correlated subqueries with aggregate subquery expression
> -------------------------------------------------------------------------------------
>
>                 Key: CALCITE-1583
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1583
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Vineet Garg
>            Assignee: Julian Hyde
>              Labels: sub-query
>
> Following query produces wrong result:
> {code} select * from depts where exists (select sum(empno) from emps where depts.deptno = emps.deptno and 1=2) {code}
> Expected Result:
> {noformat}
> deptno |   name    
> --------+-----------
>      10 | Sales
>      20 | Marketing
>      30 | Accounts
> (3 rows)
> {noformat}
> Actual results
> {noformat} zero rows {noformat}
> Calcite rewrites such queries into JOIN which ignores the fact that aggregate functions such as {{sum}} always produce one row, effectively making {{EXISTS}} predicate always true.
> Same is the case with {{Scalar}} and {{IN}} sub-queries.



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