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https://issues.apache.org/jira/browse/CALCITE-551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14266390#comment-14266390
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Julian Hyde commented on CALCITE-551:
-------------------------------------
That would be one way -- a good way -- to implement queries like this. Right
now SQL-to-rel gets really tangled up when it sees a sub-query in an aggregate,
so it doesn't get as far as decorrelation.
> Sub-query inside aggregate function
> -----------------------------------
>
> Key: CALCITE-551
> URL: https://issues.apache.org/jira/browse/CALCITE-551
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
>
> Calcite SQL-to-rel translator cannot handle a sub-query inside an aggregate
> function. An example is SqlToRelConverterTest.testAggCaseInSubquery:
> {code}SELECT SUM(
> CASE WHEN deptno IN (SELECT deptno FROM dept) THEN 1
> ELSE 0 END)
> FROM emp{code}
> Similar issue CALCITE-516 involves IN with constant list inside an aggregate
> function, which is treated similarly to a sub-query but is simpler.
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