[teiid-issues] [JBoss JIRA] (TEIID-5932) LATERAL LEFT JOIN can return duplicate rows at batch boundaries

[Steven Hawkins (Jira)]

     [ https://issues.redhat.com/browse/TEIID-5932?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Hawkins updated TEIID-5932:
----------------------------------
    Summary: LATERAL LEFT JOIN can return duplicate rows at batch boundaries  (was: HAVING in combination with LEFT JOIN of two XMLTABLE sub-queries returns an incorrect result)


> LATERAL LEFT JOIN can return duplicate rows at batch boundaries
> ---------------------------------------------------------------
>
>                 Key: TEIID-5932
>                 URL: https://issues.redhat.com/browse/TEIID-5932
>             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: 4 hours
>          Time Spent: 5 hours, 30 minutes
>  Remaining Estimate: 0 minutes
>
> HAVING in combination with LEFT JOIN of two XMLTABLE sub-queries returns an incorrect result if one of XMLTABLE sub-queries has INNER, LEFT or CROSS JOIN instead of a lateral one and amount of rows in the source is equal or more than 1024. For example, the query:
> {code:sql}
> SELECT
> 	xt.event_id
> FROM test_dwh_pg.test_having AS d
> --here
> INNER JOIN XMLTABLE(
> 			'/root'
> 			PASSING JSONTOXML('root', d.str)
> 			COLUMNS
> 				event_id string PATH 'eventid'
> 		) xt
> 	ON TRUE
> LEFT JOIN XMLTABLE(
> 			'/anything'
> 			PASSING JSONTOXML('anything', d.str)
> 			COLUMNS
> 				some_col string PATH 'anything'
> 		) xt2 
> 	ON xt.event_id = 'xxx'
> 	GROUP BY event_id
> 	HAVING COUNT(*) > 1 ;;
> {code}
> will return a result but it should return no results as there are no duplicates in test data.



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