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From "Alex Parvulescu (JIRA)" <j...@apache.org>
Subject [jira] Updated: (JCR-2852) Support multi-selector OR constraints in join queries
Date Wed, 09 Mar 2011 18:08:59 GMT

     [ 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.patch

Patch to split an affected query (one that has an OR that spans over both sides of a JOIN),
run the 2 splits and then merge the results.

> 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.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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