Alan Woodward created LUCENE-7828:
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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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