[teiid-issues] [JBoss JIRA] (TEIID-1617) Incorrect rewrite of subquery
Steven Hawkins (JIRA)
jira-events at lists.jboss.org
Thu Feb 23 10:14:41 EST 2012
[ https://issues.jboss.org/browse/TEIID-1617?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steven Hawkins closed TEIID-1617.
---------------------------------
> Incorrect rewrite of subquery
> -----------------------------
>
> Key: TEIID-1617
> URL: https://issues.jboss.org/browse/TEIID-1617
> Project: Teiid
> Issue Type: Bug
> Components: Query Engine
> Affects Versions: 7.4
> Reporter: Steven Hawkins
> Assignee: Steven Hawkins
> Priority: Critical
> Fix For: 7.4.1, 7.5
>
>
> when performing a semi-join against a query with a key preserved in the semi join criteria and a non-distinct subquery the planner will incorrectly created an unnested query that does not preserve the semi-join. This can happen with either the explicit mj hint or with the query unnesting property set.
> e.g.
> select col2 from tbl where keyCol IN (select dupCol from tbl2)
> will become
> select col2 from tbl, tbl2 where keyCol = tbl2
> rather than
> select col2 from tbl, (select distinct dupCol from tbl2) x where keyCol = tbl2
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