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https://issues.apache.org/jira/browse/OAK-1263?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Davide Giannella updated OAK-1263:
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Attachment: OAK-1263-r1b.patch
Attached a new version of patch {OAK-1263-r1b.patch}.
[~tmueller] the headers where already there. Don't want you looked at the old
version of the patch file.
I tried to apply all the suggestions with the reserve of the PATH vs path
(uppercase variable vs lowercase) as in the use case you highlighted it's a
constant (final) and by java conventions it should be uppercase. Anyhow I'm not
strict on those aspect so if you think it should be lowercase tell me and I'll
convert it.
> optimize oak index to support 'fast ORDER BY' queries to support sorting &
> pagination for large set of children
> ---------------------------------------------------------------------------------------------------------------
>
> Key: OAK-1263
> URL: https://issues.apache.org/jira/browse/OAK-1263
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: query
> Affects Versions: 0.12
> Reporter: Stefan Egli
> Assignee: Alex Parvulescu
> Fix For: 0.18
>
> Attachments: OAK-1263-r1.patch, OAK-1263-r1a.patch,
> OAK-1263-r1b.patch, benchmark-20140228112150.log,
> benchmark-20140228120718.log, benchmark-20140228125248.log
>
>
> We have a use case where we'd like to be able to use an index in a
> "pagination-like" fashion. That is, we'd like to be able to have an index on
> a subtree on a certain property, and then run a query which does ORDER BY
> that property combined with OFFSET. That way, essentially allowing pagination
> of child nodes of a particular parent based on 'sorted by a certain property'.
> AFAIU currently the oak index is not optimized to support ORDER BY queries in
> a fast manner. The index keeps 'the child nodes unsorted', ie to process an
> ORDER BY, the child nodes would have to be 'manually sorted' which can result
> in bad performance given a large number of child nodes.
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