[teiid-issues] [JBoss JIRA] Closed: (TEIID-1335) Customer requesting the ability to make query planner always create dependent joins.

Thu Mar 24 00:40:51 EDT 2011

     [ https://issues.jboss.org/browse/TEIID-1335?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Hawkins closed TEIID-1335.
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> Customer requesting the ability to make query planner always create dependent joins.
> ------------------------------------------------------------------------------------
>
>                 Key: TEIID-1335
>                 URL: https://issues.jboss.org/browse/TEIID-1335
>             Project: Teiid
>          Issue Type: Feature Request
>          Components: Server
>            Reporter: Debbie Steigner
>            Assignee: Steven Hawkins
>
> Customer is finding that the query planner often chooses to use a non-dependent join plan, even when cost statistics have been gathered on all source systems and a dependent plan would perform much better.
> I've showed them how to use option makedep to force a dependent join scenario. However, it requires careful analysis of each query to setup the proper makedep parameters, and may not be feasible when working with hibernate as the client.
> Thus, they ask: is there any way to tell the query planner to always use dependent join for every join, no matter what.

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