[teiid-issues] [JBoss JIRA] Resolved: (TEIID-1508) Dependent join planning problem
Steven Hawkins (JIRA)
jira-events at lists.jboss.org
Tue Mar 15 21:30:45 EDT 2011
[ https://issues.jboss.org/browse/TEIID-1508?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steven Hawkins resolved TEIID-1508.
-----------------------------------
Resolution: Done
updated the dependent join logic to consider more accurately the affect of creating the dependent join and moved consideration for dependent joins into the determination of join ordering
> Dependent join planning problem
> -------------------------------
>
> 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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