Thomas Mueller created OAK-2023:
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Summary: 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
Fix For: 1.1
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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