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https://issues.apache.org/jira/browse/SPARK-46468?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-46468.
---------------------------------
Fix Version/s: 4.0.0
Resolution: Fixed
Issue resolved by pull request 44451
[https://github.com/apache/spark/pull/44451]
> COUNT bug in lateral/exists subqueries
> --------------------------------------
>
> Key: SPARK-46468
> URL: https://issues.apache.org/jira/browse/SPARK-46468
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Andrey Gubichev
> Assignee: Andrey Gubichev
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
>
> Some further instances of a COUNT bug.
>
> One example is this test from join-lateral.sql
> [https://github.com/apache/spark/blame/master/sql/core/src/test/resources/sql-tests/results/join-lateral.sql.out#L757]
>
> According to PostgreSQL, the query should return 2 rows:
> c1 | c2 | sum
> ---{-}++{-}--{-}{-}----
> 0 | 1 | 2
> 1 | 2 | NULL
>
> whereas Spark SQL only returns the first one.
>
> Similar instance is the following query, which should return 1 row from t1
> but has an empty result now:
> {{create temporary view t1(c1, c2) as values (0, 1), (1, 2);}}
> {{create temporary view t2(c1, c2) as values (0, 2), (0, 3);}}
> {{SELECT tt1.c2}}
> {{FROM t1 as tt1}}
> {{WHERE tt1.c1 in (}}
> select max(tt2.c1)
> from t2 as tt2
> where tt1.c2 is null);
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