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https://issues.apache.org/jira/browse/SPARK-52531?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan reassigned SPARK-52531:
-----------------------------------
Assignee: Mihailo Timotic
> `OuterReference` in subquery aggregate is incorrectly tied to outer query
> aggregate
> -----------------------------------------------------------------------------------
>
> Key: SPARK-52531
> URL: https://issues.apache.org/jira/browse/SPARK-52531
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 4.1.0
> Reporter: Mihailo Timotic
> Assignee: Mihailo Timotic
> Priority: Major
>
> For a query like:
>
> {{}}
> {code:java}
> {code}
> {{SELECT MAX(a.col1) }}
> {{FROM VALUES (7) AS a(col1) }}
> {{GROUP BY a.col1 }}
> {{HAVING COUNT(*) = ( }}
> {{ SELECT COUNT(*) }}
> {{ FROM VALUES (7),(7),(8),(8) AS c(col1) }}
> {{ WHERE c.col1 >= a.col1 }}
> {{ GROUP BY c.col1 }}
> {{ LIMIT 1 }}
> {{) }}
> {{ORDER BY a.col1 DESC;}}
>
>
> Spark outputs result: `7`
> {{}}
> However, this is an incorrect result and both MySQL and DuckDB correctly
> output 0 rows
>
> !image-2025-06-19-10-08-02-417.png!
> !image-2025-06-19-10-08-15-034.png!
> This is because count(*) from the subquery under Having is incorrectly tied
> as an outer reference to the count(*) from the outer query:
>
> {{}}
> {code:java}
> Project [max(col1)#3081747] +- Sort [col1#3081725 DESC NULLS LAST], true
> +- Project [max(col1)#3081747, col1#3081725] +- Filter
> (count(1)#3081750L = scalar-subquery#3081727 [col1#3081725]) : +-
> GlobalLimit 1 : +- LocalLimit 1 : +- Aggregate
> [col1#3081726], [outer(count(1)#3081750L) AS count(1)#3081749L] :
> +- Filter (col1#3081726 >= outer(col1#3081725)) :
> +- SubqueryAlias c : +- LocalRelation
> [col1#3081726] +- Aggregate [col1#3081725], [max(col1#3081725) AS
> max(col1)#3081747, count(1) AS count(1)#3081750L, col1#3081725]
> +- SubqueryAlias a +- LocalRelation [col1#3081725]{code}
>
>
> The outer reference on count(*) is introduced in UpdateOuterReferences rule.
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