[teiid-issues] [JBoss JIRA] (TEIID-3183) Join sort order altered inappropriately
Steven Hawkins (JIRA)
issues at jboss.org
Fri Mar 13 10:24:29 EDT 2015
[ https://issues.jboss.org/browse/TEIID-3183?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steven Hawkins closed TEIID-3183.
---------------------------------
> Join sort order altered inappropriately
> ---------------------------------------
>
> Key: TEIID-3183
> URL: https://issues.jboss.org/browse/TEIID-3183
> Project: Teiid
> Issue Type: Bug
> Components: Query Engine
> Affects Versions: 8.4
> Reporter: Steven Hawkins
> Assignee: Steven Hawkins
> Priority: Critical
> Fix For: 8.7.1, 8.9
>
>
> If a merge or other join configuration is chosen and there is a subquery affecting only a side of the join that is to be sorted such that the subquery can be rewritten as a semi/anti-semi join, then the subquery rewrite will alter the intended sort order of the original join. This can result in incorrect results.
> An example query:
> select pm2.g2.e1 from pm1.g1 inner join pm2.g2 on (pm1.g1.e1 = pm2.g2.e1) where pm2.g2.e2 in /*+ mj */ (select count(e2) FROM pm1.g2 group by e1 having e1 < pm2.g2.e3)
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