[teiid-issues] [JBoss JIRA] (TEIID-3237) Prevent processing cross joins with unknown cardinalities
Steven Hawkins (JIRA)
issues at jboss.org
Tue Dec 2 09:32:40 EST 2014
[ https://issues.jboss.org/browse/TEIID-3237?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steven Hawkins resolved TEIID-3237.
-----------------------------------
Resolution: Done
Modified the join region logic to not penalize joins with unknown costs with predicates and to check if criteria is marked as optional to build a better tree in certain situations.
> Prevent processing cross joins with unknown cardinalities
> ---------------------------------------------------------
>
> Key: TEIID-3237
> URL: https://issues.jboss.org/browse/TEIID-3237
> Project: Teiid
> Issue Type: Quality Risk
> Components: Query Engine
> Reporter: Steven Hawkins
> Assignee: Steven Hawkins
> Fix For: 8.10
>
>
> The optimizer will select plans with cross joins (particularly with a parent dependent join) when the join is to be processed in Teiid and the cardinality of both sides of the join are unknown.
> We should prefer non cross join plans in these scenarios.
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