Alex Parvulescu created OAK-937:
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Summary: Query engine index selection tweaks: shortcut and hint
Key: OAK-937
URL: https://issues.apache.org/jira/browse/OAK-937
Project: Jackrabbit Oak
Issue Type: Improvement
Components: core, query
Reporter: Alex Parvulescu
Priority: Minor
This issue covers 2 different changes related to the way the QueryEngine
selects a query index:
Firstly there could be a way to end the index selection process early via a
known constant value: if an index returns a known value token (like -1000) then
the query engine would effectively stop iterating through the existing index
impls and use that index directly.
Secondly it would be nice to be able to specify a desired index (if one is
known to perform better) thus skipping the existing selection mechanism (cost
calculation and comparison). This could be done via certain query hints [0].
[0] http://en.wikipedia.org/wiki/Hint_(SQL)
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