[teiid-issues] [JBoss JIRA] (TEIID-5933) Nested left joins return wrong results
Steven Hawkins (Jira)
issues at jboss.org
Fri Apr 10 15:44:04 EDT 2020
[ https://issues.redhat.com/browse/TEIID-5933?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steven Hawkins updated TEIID-5933:
----------------------------------
Story Points: 0.5
Sprint: DV Sprint 62
> Nested left joins return wrong results
> --------------------------------------
>
> Key: TEIID-5933
> URL: https://issues.redhat.com/browse/TEIID-5933
> Project: Teiid
> Issue Type: Bug
> Components: Query Engine
> Affects Versions: 13.1
> Reporter: Dmitrii Pogorelov
> Assignee: Steven Hawkins
> Priority: Blocker
> Fix For: 14.0, 13.0.3, 13.1.1
>
>
> Nested left joins in combination with a where x is null (on a left joined column) return wrong results:
> {code:sql}
> -- wrong result
> SELECT *
> FROM test_dwh_pg.test_1 a
> LEFT JOIN ( SELECT x.c1
> FROM test_dwh_pg.test_2 x
> LEFT JOIN (SELECT * FROM test_dwh_pg.test_3 WHERE c1 <> '123') y ON x.c1 = y.c1 WHERE y.c1 IS NULL
> ) b ON a.c1 = b.c1
> WHERE b.c1 IS NULL ;;
>
> -- correct result
> SELECT *
> FROM test_dwh_pg.test_1 a
> LEFT JOIN ( SELECT x.c1
> FROM test_dwh_pg.test_2 x
> LEFT JOIN (SELECT * FROM test_dwh_pg.test_3 WHERE c1 <> '123') y ON x.c1 = y.c1 WHERE y.c1 IS NULL
> LIMIT 1000000000
> ) b ON a.c1 = b.c1
> WHERE b.c1 IS NULL ;;
> {code}
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