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From "Jukka Zitting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-2715) Improved join query performance
Date Tue, 19 Oct 2010 07:56:29 GMT

    [ https://issues.apache.org/jira/browse/JCR-2715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12922476#action_12922476
] 

Jukka Zitting commented on JCR-2715:
------------------------------------

Yes, I'm still working on fixing some remaining issues before I plug the new implementation
in as the QueryObjectModelImpl.execute() method. I also have some pending work on tighter
integrating the new join query code with the underlying Lucene index so we can avoid the extra
layer of SQL1 queries that the implementation now uses.

For now it's possible to use this implementation by directly instantiating the QueryEngine
class like this:

    QueryObjectModel qom = ...;
    QueryResult result  = new QueryEngine(session).execute(
            qom.getColumns(), qom.getSource(),
            qom.getConstraint(), qom.getOrderings());


> Improved join query performance
> -------------------------------
>
>                 Key: JCR-2715
>                 URL: https://issues.apache.org/jira/browse/JCR-2715
>             Project: Jackrabbit Content Repository
>          Issue Type: Improvement
>          Components: jackrabbit-core, query
>            Reporter: Jukka Zitting
>            Assignee: Jukka Zitting
>             Fix For: 2.2.0
>
>
> Our current implementation of SQL2 join queries does not perform very well on pretty
much any non-trivial data set.

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