[teiid-issues] [JBoss JIRA] (TEIID-5550) DISTINCT pushed down incorrectly in some cases
RH Bugzilla Integration (Jira)
issues at jboss.org
Thu Nov 22 11:56:00 EST 2018
[ https://issues.jboss.org/browse/TEIID-5550?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
RH Bugzilla Integration updated TEIID-5550:
-------------------------------------------
Bugzilla References: https://bugzilla.redhat.com/show_bug.cgi?id=1652324
Bugzilla Update: Perform
> 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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