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Posted to dev@lucene.apache.org by "Nicholas Knize (JIRA)" <ji...@apache.org> on 2017/05/16 15:10:05 UTC

[jira] [Assigned] (LUCENE-7828) Improve PointValues visitor calls when all docs in a leaf share a value

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

Nicholas Knize reassigned LUCENE-7828:
--------------------------------------

    Assignee: Nicholas Knize

> 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
>
> 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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