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https://issues.apache.org/jira/browse/LUCENE-8867?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ignacio Vera resolved LUCENE-8867.
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Fix Version/s: 8.2
Assignee: Ignacio Vera
Resolution: Fixed
Thanks [~sokolov], indeed it can be resolved.
> Optimise BKD tree for low cardinality leaves
> --------------------------------------------
>
> Key: LUCENE-8867
> URL: https://issues.apache.org/jira/browse/LUCENE-8867
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Ignacio Vera
> Assignee: Ignacio Vera
> Priority: Major
> Fix For: 8.2
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> Currently if a leaf on the BKD tree contains only few values, then the leaf
> is treated the same way as it all values are different. It many cases it can
> be much more efficient to store the distinct values with the cardinality.
> In addition, in this case the method IntersectVisitor#visit(docId, byte[]) is
> called n times with the same byte array but different docID. This issue
> proposes to add a new method to the interface that accepts an array of docs
> so it can be override by implementors and gain search performance.
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