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From "Adrien Grand (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (LUCENE-7828) Improve PointValues visitor calls when all docs in a leaf share a value
Date Wed, 07 Jun 2017 17:01:18 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-7828?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Adrien Grand resolved LUCENE-7828.
----------------------------------
       Resolution: Fixed
    Fix Version/s: 6.7
                   master (7.0)

> Improve PointValues visitor calls when all docs in a leaf share a value
> -----------------------------------------------------------------------
>
>                 Key: LUCENE-7828
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7828
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Alan Woodward
>            Assignee: Nicholas Knize
>             Fix For: master (7.0), 6.7
>
>         Attachments: LUCENE-7828.patch
>
>
> When all the docs in a leaf node have the same value, range queries can waste a lot of
processing if the node itself returns CELL_CROSSES_QUERY when compare() is called, in effect
performing the same calculation in visit(int, byte[]) over and over again.  In the case I'm
looking at (very low cardinality indexed LongRange fields), this causes something of a perfect
storm for performance.  PointValues can detect up front if a given node has a single value
(because it's min value and max value will be equal), so this case should be fairly simple
to identify and shortcut.



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