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From "Marcel Reutegger (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-1365) Query path constraints like foo//*/bar do not scale
Date Tue, 12 Feb 2008 16:57:09 GMT

    [ https://issues.apache.org/jira/browse/JCR-1365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12568209#action_12568209
] 

Marcel Reutegger commented on JCR-1365:
---------------------------------------

Implemented a first series of improvements:

- ChildAxisQuery does not look up child nodes anymore using the PARENT field. This is slow
and there is no cache for this kind of information. Instead it now uses the HierarchyResolver
like DescendantSelfAxisQuery. If no name test is specified ChildAxisQuery now looks up the
child node entries on the respective NodeStates. This may cause access to the Persistence
Manager.

- Generalized DescendantSelfAxisQuery to work with any given level between context and sub
query. So far only zero and one were supported. Zero made DescendantSelfAxisQuery act like
the XPath descendant-or-self axis and one like a descendant axis.

- ChildAxisQuery and DescendantSelfAxisQuery now optimize certain combinations of axis queries
into a more compact form, which performs better.

Committed in revision: 620859

> Query path constraints like foo//*/bar do not scale
> ---------------------------------------------------
>
>                 Key: JCR-1365
>                 URL: https://issues.apache.org/jira/browse/JCR-1365
>             Project: Jackrabbit
>          Issue Type: Improvement
>          Components: jackrabbit-core
>            Reporter: Marcel Reutegger
>            Priority: Minor
>
> To resolve the * step the LuceneQueryBuilder currently creates a MatchAllQuery and checks
every node for a foo ancestor. Instead, it should search for bar nodes and check for foo ancestors
with at least one arbitrary hierarchy level in between.

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