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Date: Fri, 18 Mar 2011 16:22:29 +0000 (UTC)
From: "Alex Parvulescu (JIRA)" <jira@apache.org>
To: dev@jackrabbit.apache.org
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Subject: [jira] Updated: (JCR-2852) Support multi-selector OR constraints in
 join queries
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     [ https://issues.apache.org/jira/browse/JCR-2852?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alex Parvulescu updated JCR-2852:
---------------------------------

    Attachment: JCR-2852-outer-join-test.patch

Attached a simple Outer Join test

> Support multi-selector OR constraints in join queries
> -----------------------------------------------------
>
>                 Key: JCR-2852
>                 URL: https://issues.apache.org/jira/browse/JCR-2852
>             Project: Jackrabbit Content Repository
>          Issue Type: Improvement
>          Components: jackrabbit-core, query
>            Reporter: Jukka Zitting
>         Attachments: JCR-2852-NPE.patch, JCR-2852-outer-join-test.patch, JCR-2852.patch
>
>
> Our current join implementation doesn't support OR constraints that refer to more than one selector. For example the following query is not possible:
>     SELECT a.* FROM [my:type] AS a INNER JOIN [my:type] as b ON a.foo = b.bar WHERE a.baz = 'x' OR b.baz = 'y'
> This limitation is a result of the way the join execution splits the query into per-selector components and merges the result based on the given join condition.
> A simple but often inefficient solution would be to process such OR constraints as post-processing filters like we already do for some other more complex constraint types.

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