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https://issues.apache.org/jira/browse/SPARK-43718?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Dongjoon Hyun resolved SPARK-43718.
-----------------------------------
Fix Version/s: 3.3.3
3.5.0
3.4.1
Resolution: Fixed
Issue resolved by pull request 41267
[https://github.com/apache/spark/pull/41267]
> References to a specific side's key in a USING join can have wrong nullability
> ------------------------------------------------------------------------------
>
> Key: SPARK-43718
> URL: https://issues.apache.org/jira/browse/SPARK-43718
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.3.2, 3.4.0, 3.5.0
> Reporter: Bruce Robbins
> Assignee: Bruce Robbins
> Priority: Major
> Labels: correctness
> Fix For: 3.3.3, 3.5.0, 3.4.1
>
>
> Assume this data:
> {noformat}
> create or replace temp view t1 as values (1), (2), (3) as (c1);
> create or replace temp view t2 as values (2), (3), (4) as (c1);
> {noformat}
> The following query produces incorrect results:
> {noformat}
> spark-sql (default)> select explode(array(t1.c1, t2.c1)) as x1
> from t1
> full outer join t2
> using (c1);
> 1
> -1 <== should be null
> 2
> 2
> 3
> 3
> -1 <== should be null
> 4
> Time taken: 0.663 seconds, Fetched 8 row(s)
> spark-sql (default)>
> {noformat}
> Similar issues occur with right outer join and left outer join.
> {{t1.c1}} and {{t2.c1}} have the wrong nullability at the time the array is
> resolved, so the array's {{containsNull}} value is incorrect.
> Queries that don't use arrays also can get wrong results. Assume this data:
> {noformat}
> create or replace temp view t1 as values (0), (1), (2) as (c1);
> create or replace temp view t2 as values (1), (2), (3) as (c1);
> create or replace temp view t3 as values (1, 2), (3, 4), (4, 5) as (a, b);
> {noformat}
> The following query produces incorrect results:
> {noformat}
> select t1.c1 as t1_c1, t2.c1 as t2_c1, b
> from t1
> full outer join t2
> using (c1),
> lateral (
> select b
> from t3
> where a = coalesce(t2.c1, 1)
> ) lt3;
> 1 1 2
> NULL 3 4
> Time taken: 2.395 seconds, Fetched 2 row(s)
> spark-sql (default)>
> {noformat}
> The result should be the following:
> {noformat}
> 0 NULL 2
> 1 1 2
> NULL 3 4
> {noformat}
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