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https://issues.apache.org/jira/browse/OAK-2023?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Mueller resolved OAK-2023.
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Resolution: Won't Fix
No longer needed due to OAK-2944.
Also related to OAK-1617.
> Optimal index usage for XPath queries with "order by" combined with "or"
> ------------------------------------------------------------------------
>
> Key: OAK-2023
> URL: https://issues.apache.org/jira/browse/OAK-2023
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: query
> Reporter: Thomas Mueller
> Assignee: Thomas Mueller
> Labels: performance
> Fix For: 1.3.4
>
>
> XPath queries with "or" are converted to union, even if there is an "order
> by" clause. In such cases, sorting is done in memory. See also OAK-2022.
> For some queries, it might be better to not use union, but use an ordered
> index instead. This is tricky to decide up-front, but it would be possible to
> estimate the cost of both variants and pick the one that seems better.
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