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From "Alan Woodward (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-7828) Improve PointValues visitor calls when all docs in a leaf share a value
Date Mon, 15 May 2017 14:54:04 GMT
Alan Woodward created LUCENE-7828:
-------------------------------------

             Summary: 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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