[teiid-issues] [JBoss JIRA] Created: (TEIID-1508) Dependent join planning problem
Steven Hawkins (JIRA)
jira-events at lists.jboss.org
Fri Mar 11 16:35:45 EST 2011
Dependent join planning problem
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Key: TEIID-1508
URL: https://issues.jboss.org/browse/TEIID-1508
Project: Teiid
Issue Type: Quality Risk
Components: Query Engine
Affects Versions: 7.4
Reporter: Steven Hawkins
Assignee: Steven Hawkins
Fix For: 7.4
Without a dependent join hint a composite cross source dependent join will not plan correctly unless the independent side can be pushed as a single query. The root of the issue is that join planning involving more than 1 independent table does not consider the effect of potential dependent joins early enough.
The workaround is to use a dependent join hint or set the cardinality of the independent tables small enough to trigger the proper dependent join.
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