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https://issues.apache.org/jira/browse/OAK-2618?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Davide Giannella updated OAK-2618:
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Fix Version/s: (was: 1.3.12)
1.3.13
> Improve performance of queries with ORDER BY and multiple OR filters
> --------------------------------------------------------------------
>
> Key: OAK-2618
> URL: https://issues.apache.org/jira/browse/OAK-2618
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: query
> Reporter: Amit Jain
> Assignee: Amit Jain
> Labels: performance
> Fix For: 1.3.13
>
>
> When multiple OR constraints are specified in the XPATH query, itis broken up
> into union of multiple clauses. If query includes an order by clause, the
> sorting in this case is done by traversing the result set in memory leading
> to slow query performance.
> Possible improvements could include:
> * For indexes which can support multiple filters (like lucene, solr) such
> queries should be efficient and the query engine can pass-thru the query as
> is.
> ** Possibly also needed for other cases also. So, we can have some sort of
> capability advertiser for indexes which can hint the query engine
> and/or
> * Batched merging of the sorted iterators returned for the multiple union
> queries (possible externally).
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