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https://issues.apache.org/jira/browse/OAK-2926?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Mueller updated OAK-2926:
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Attachment: OAK-2926-c.patch
OAK-2926-c.patch (trunk; support for the "old" Lucene full-text index, and
support for "union" queries)
> Fast result size estimate
> -------------------------
>
> Key: OAK-2926
> URL: https://issues.apache.org/jira/browse/OAK-2926
> Project: Jackrabbit Oak
> Issue Type: New Feature
> Components: query
> Reporter: Thomas Mueller
> Assignee: Thomas Mueller
> Labels: performance
> Fix For: 1.3.1, 1.2.3, 1.0.15
>
> Attachments: OAK-2926-b-1.0.patch, OAK-2926-b-1.2.patch,
> OAK-2926-b.patch, OAK-2926-c.patch, OAK-2926.patch
>
>
> When asking for the correct result size of a query, the complete result needs
> to be read, so that access rights checks are made, and (unless the index is
> known to be up-to-date, and can process all conditions) so that the existence
> and all query conditions are checked.
> Jackrabbit 2.x supports a fast way to get an estimate of the result size,
> without doing access rights checks. See also JCR-3858.
> Please note that according to the JCR API, NodeIterator.getSize() may return
> -1 (for "unknown"), and in Oak this is currently done if counting is slow.
> This would also need to be disabled if a fast result size estimate is needed.
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