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From "Marcel Reutegger (JIRA)" <j...@apache.org>
Subject [jira] [Created] (JCR-3603) Index aggreate with property include does not speed up order by
Date Thu, 30 May 2013 09:59:20 GMT
Marcel Reutegger created JCR-3603:

             Summary: Index aggreate with property include does not speed up order by
                 Key: JCR-3603
                 URL: https://issues.apache.org/jira/browse/JCR-3603
             Project: Jackrabbit Content Repository
          Issue Type: Bug
          Components: jackrabbit-core
    Affects Versions: 2.6, 2.4, 2.3, 2.2
            Reporter: Marcel Reutegger

JCR-800 introduced support for order by with a relative path in Jackrabbit 1.6. The feature
introduced two ways how sorting is implemented. One is based on reading the sort value from
the persistence manager and the second one uses internal lucene functionality to perform more
efficient sorting. The latter requires a customized indexing configuration with an aggregate
definition with a include-property for the property to order by. See also documentation on
the wiki: http://wiki.apache.org/jackrabbit/IndexingConfiguration

Starting with Jackrabbit 2.2 the second sort mechanism is broken and the repository always
falls back to the first mechanism, which is considerably slower when the number of results

The root cause is a subtle change of Path.computeRelativePath() in Jackrabbit 2.2. Previously
the implementation would return a *normalized* relative path. Starting with 2.2 the returned
path is not normalized and starts with a current node element.

That is, previously (pseudo code):
"/foo/bar".computeRelativePath("/foo") returned "bar"

"/foo/bar".computeRelativePath("/foo") returns "./bar"

The JavaDoc of the method does not say whether the returned path is normalized or not. From
this perspective the change in behavior is with the specified contract.

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