[teiid-issues] [JBoss JIRA] (TEIID-5937) Union All followed by except returns wrong results

[Steven Hawkins (Jira)]

     [ https://issues.redhat.com/browse/TEIID-5937?focusedWorklogId=12450848&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-12450848 ]

Steven Hawkins logged work on TEIID-5937:
-----------------------------------------

                Author: Steven Hawkins
            Created on: 17/Apr/20 11:55 AM
            Start Date: 17/Apr/20 11:55 AM
    Worklog Time Spent: 3 hours 

Issue Time Tracking
-------------------

    Remaining Estimate: 1 hour  (was: 4 hours)
            Time Spent: 3 hours
            Worklog Id:     (was: 12450848)


> Union All followed by except returns wrong results
> --------------------------------------------------
>
>                 Key: TEIID-5937
>                 URL: https://issues.redhat.com/browse/TEIID-5937
>             Project: Teiid
>          Issue Type: Bug
>          Components: Query Engine
>    Affects Versions: 13.1
>            Reporter: Dmitrii Pogorelov
>            Assignee: Steven Hawkins
>            Priority: Blocker
>             Fix For: 13.1, 14.0, 13.0.3
>
>   Original Estimate: 4 hours
>          Time Spent: 3 hours
>  Remaining Estimate: 1 hour
>
> The following queries return wrong results:
> {code:sql}
> -- <null> though should return 1 
> select * from views.test2 except select * from views.test1
> UNION ALL
> select * from views.test1 except select * from views.test2 ;;
>  
> -- <null> though should return 1
> (select * from views.test2 except select * from views.test1
> UNION ALL
> select * from views.test1) except select * from views.test2 ;;
> {code}



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