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From "Vikas Saurabh (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (OAK-6735) Lucene Index: improved cost estimation by using document count per field
Date Wed, 01 Nov 2017 08:51:00 GMT

     [ https://issues.apache.org/jira/browse/OAK-6735?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vikas Saurabh resolved OAK-6735.
--------------------------------
       Resolution: Fixed
    Fix Version/s: 1.7.11

Fixed on trunk at [r1813955|https://svn.apache.org/r1813955].

> Lucene Index: improved cost estimation by using document count per field
> ------------------------------------------------------------------------
>
>                 Key: OAK-6735
>                 URL: https://issues.apache.org/jira/browse/OAK-6735
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: lucene, query
>    Affects Versions: 1.7.4
>            Reporter: Thomas Mueller
>            Assignee: Vikas Saurabh
>            Priority: Major
>             Fix For: 1.8, 1.7.11
>
>         Attachments: IndexReadPattern.txt, LuceneIndexReadPattern.java, OAK-6735.patch
>
>
> The cost estimation of the Lucene index is somewhat inaccurate because (by default) it
just used the number of documents in the index (as of Oak 1.7.4 by default, due to OAK-6333).
> Instead, it should use the number of documents for the given fields (the minimum, if
there are multiple fields with restrictions). 
> Plus divided by the number of restrictions (as we do now already).



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