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https://issues.apache.org/jira/browse/OAK-4904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15554980#comment-15554980
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Thomas Mueller commented on OAK-4904:
-------------------------------------
http://svn.apache.org/r1763756 (trunk)
> For unique indexes avoid consulting indexes other than property index
> ---------------------------------------------------------------------
>
> Key: OAK-4904
> URL: https://issues.apache.org/jira/browse/OAK-4904
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: query
> Reporter: Chetan Mehrotra
> Assignee: Thomas Mueller
> Labels: performance
> Fix For: 1.5.12
>
> Attachments: OAK-4904-v1.patch, OAK-4904-v2.patch
>
>
> Currently for queries involving unique index like
> {noformat}
> SELECT * FROM [nt:base] WHERE [jcr:uuid] = $id
> {noformat}
> QueryEngine would start consulting all types of index in order of minimum
> cost. Where minimum cost are
> * PropertyIndex - 2.0
> * LucenePropertyIndex - 2.1
> For such queries in case of match property index returns a cost of (base) 2 +
> (count) 1 = 3 due to which QE has to consult Lucene index also. Given such
> queries a very frequent it would be better to avoid consulting Lucene index
> as that adds unnecessary overhead
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