[jira] [Created] (OAK-4904) For unique indexes avoid consulting indexes other than property index

["Chetan Mehrotra (JIRA)" <ji...@apache.org>]

Chetan Mehrotra created OAK-4904:
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             Summary: 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: Chetan Mehrotra
             Fix For: 1.6


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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