[teiid-issues] [JBoss JIRA] (TEIID-5550) DISTINCT pushed down incorrectly in some cases

[Steven Hawkins (Jira)]

     [ https://issues.jboss.org/browse/TEIID-5550?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Hawkins resolved TEIID-5550.
-----------------------------------
    Fix Version/s: 11.1.2
                   12.0
                   11.2.1
       Resolution: Done


Updated the readability of the suspect logic and ensured that we don't look at dup removal nodes above a parent join.

> DISTINCT pushed down incorrectly in some cases
> ----------------------------------------------
>
>                 Key: TEIID-5550
>                 URL: https://issues.jboss.org/browse/TEIID-5550
>             Project: Teiid
>          Issue Type: Bug
>          Components: Query Engine
>    Affects Versions: 8.12.15.6_4
>         Environment: JDV 6.4.5
>            Reporter: Marc Shirley
>            Assignee: Steven Hawkins
>            Priority: Major
>             Fix For: 11.1.2, 12.0, 11.2.1
>
>
> The parent DISTINCT is being removed over joins in particular situations.  This is a regression from TEIID-3063 TEIID-3062.
> Conditions:
> - basic query structure is select distinct col from a join b on a.col2 = b.col2
> - a sort merge join variant must have been planned
> - the sort must not be pushed to one of the children
> - the projection related conditions of TEIID-3062 / TEIID-3063 must be met
> - there is a one to many relationship
> The result is that the parent distinct will be inappropriately removed, such that the output of the join can contain repetition of the col value when it should be distinct.



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