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https://issues.apache.org/jira/browse/OAK-2926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14567079#comment-14567079
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Davide Giannella commented on OAK-2926:
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Linking the related OAK-2807
> 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
>
> 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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