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