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