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https://issues.apache.org/jira/browse/OAK-7390?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Davide Giannella updated OAK-7390:
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Fix Version/s: 1.12
> QueryResult.getSize() can be slow for many "or" or "union" conditions
> ---------------------------------------------------------------------
>
> Key: OAK-7390
> URL: https://issues.apache.org/jira/browse/OAK-7390
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: query
> Reporter: Thomas Mueller
> Assignee: Thomas Mueller
> Priority: Major
> Fix For: 1.10.0, 1.12
>
>
> For queries with many union conditions, the "fast" getSize method can
> actually be slower than iterating over the result.
> The reason is, the number of index calls grows exponential with regards to
> number of subqueries: (3x + x^2) / 2, where x is the number of subqueries.
> For this to have a measurable affect, the number of subqueries needs to be
> large (more than 100), and the index needs to be slow.
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