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https://issues.apache.org/jira/browse/OAK-1529?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Mueller resolved OAK-1529.
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Resolution: Fixed
OAK-894
> The storage backends should have an estimate on the number of nodes below a
> given path
> --------------------------------------------------------------------------------------
>
> Key: OAK-1529
> URL: https://issues.apache.org/jira/browse/OAK-1529
> Project: Jackrabbit Oak
> Issue Type: New Feature
> Components: core, query
> Reporter: Thomas Mueller
> Priority: Minor
> Fix For: 1.2
>
>
> The traversal index currently can't do a good estimate on how many nodes are
> to be traversed below a given path. To find out, it has to traverse the
> nodes. That's unfortunate, as some queries would be much faster if traversal
> is used.
> One way to solve the problem is to let the storage backends keep a estimated
> count of the number of nodes below a given path. That estimation doesn't need
> to be accurate. It could be updated (for example) on average for every 100th
> added / removed node in a background thread (with a probability 1%, adjust
> descendant counts for paths in memory and periodically flush to disk).
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