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From "Marcel Reutegger (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-800) Child Axis support in order by clause
Date Mon, 16 Feb 2009 13:01:02 GMT

    [ https://issues.apache.org/jira/browse/JCR-800?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12673871#action_12673871
] 

Marcel Reutegger commented on JCR-800:
--------------------------------------

> Question about the RelPathScoreDocComparator.sortValue(ScoreDoc i) : Will for every comparison
the property value be refetched
> through the ISM?

That's correct.

> If so, temporal storing the result of sortValue might be necessary because this easily
blows up cpu if it is not cached temporarily.

when you say temporarily, do you mean while a single result is sorted, or for a longer period.
The problem with caching here is, when the cache needs to be invalidated. e.g. a node might
get moved that is part of a relative path to a sort property.

> Perhaps it might be easier to constrain sorting on child axis only for childnodes that
are indexed through aggregates.

This will not work, because aggregates only consist of content that are fulltext indexed on
the node scope. But my idea is, to extend the indexing configuration with entries for properties
with a relative path. Those properties are then to the node where they are referenced from.
Similarly to how aggregates work.

> Child Axis support in order by clause
> -------------------------------------
>
>                 Key: JCR-800
>                 URL: https://issues.apache.org/jira/browse/JCR-800
>             Project: Jackrabbit Content Repository
>          Issue Type: Improvement
>          Components: jackrabbit-core, jackrabbit-spi-commons, xpath
>            Reporter: Savvas Triantafyllou
>             Fix For: 1.6.0
>
>         Attachments: JCR-800-core.patch, JCR-800-spi-commons.patch
>
>
> Hi, 
> since child axis is supported in XPath predicates, it would be nice to support it in
order by clause as well
> Queries of type
> //element(*, type) [ foo/@bar ]  order by foo/@bar asc
> can become very useful
> BR, 
> Savvas

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