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From "Jukka Zitting (JIRA)" <j...@apache.org>
Subject [jira] Created: (JCR-2852) Support multi-selector OR constraints in join queries
Date Wed, 22 Dec 2010 09:22:00 GMT
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

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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