[teiid-issues] [JBoss JIRA] (TEIID-5933) Nested left joins return wrong results

[Steven Hawkins (Jira)]

     [ https://issues.redhat.com/browse/TEIID-5933?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Hawkins updated TEIID-5933:
----------------------------------
     Original Estimate: 3 hours
    Remaining Estimate: 3 hours


> 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
>
>   Original Estimate: 3 hours
>  Remaining Estimate: 3 hours
>
> 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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