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Posted to issues@spark.apache.org by "Wenchen Fan (Jira)" <ji...@apache.org> on 2023/10/19 02:37:00 UTC
[jira] [Resolved] (SPARK-45507) Correctness bug in correlated scalar subqueries with COUNT aggregates
[ https://issues.apache.org/jira/browse/SPARK-45507?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Wenchen Fan resolved SPARK-45507.
---------------------------------
Fix Version/s: 4.0.0
Resolution: Fixed
Issue resolved by pull request 43341
[https://github.com/apache/spark/pull/43341]
> Correctness bug in correlated scalar subqueries with COUNT aggregates
> ---------------------------------------------------------------------
>
> Key: SPARK-45507
> URL: https://issues.apache.org/jira/browse/SPARK-45507
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 4.0.0
> Reporter: Andy Lam
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
>
> {code:java}
>
> create view if not exists t1(a1, a2) as values (0, 1), (1, 2);
> create view if not exists t2(b1, b2) as values (0, 2), (0, 3);
> create view if not exists t3(c1, c2) as values (0, 2), (0, 3);
> -- Example 1
> select (
> select SUM(l.cnt + r.cnt)
> from (select count(*) cnt from t2 where t1.a1 = t2.b1 having cnt = 0) l
> join (select count(*) cnt from t3 where t1.a1 = t3.c1 having cnt = 0) r
> on l.cnt = r.cnt
> ) from t1
> -- Correct answer: (null, 0)
> +----------------------+
> |scalarsubquery(c1, c1)|
> +----------------------+
> |null |
> |null |
> +----------------------+
> -- Example 2
> select ( select sum(cnt) from (select count(*) cnt from t2 where t1.c1 = t2.c1) ) from t1
> -- Correct answer: (2, 0)
> +------------------+
> |scalarsubquery(c1)|
> +------------------+
> |2 |
> |null |
> +------------------+
> -- Example 3
> select ( select count(*) from (select count(*) cnt from t2 where t1.c1 = t2.c1) ) from t1
> -- Correct answer: (1, 1)
> +------------------+
> |scalarsubquery(c1)|
> +------------------+
> |1 |
> |0 |
> +------------------+ {code}
>
>
> DB fiddle for correctness check:[https://www.db-fiddle.com/f/4jyoMCicNSZpjMt4jFYoz5/10403#]
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