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https://issues.apache.org/jira/browse/LUCENE-7828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16010649#comment-16010649
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Alan Woodward commented on LUCENE-7828:
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I'm trying out a few ideas here; the one I think shows the most promise is to
change IntersectVisitor.visit(int, byte[]) to take an array of docids. This
also opens up the possibility of speeding things up when a leaf only contains a
few different values.
> 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
>
> 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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