Adrien Grand created LUCENE-9619:
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             Summary: Move Points from a visitor API to a custor-style API?
                 Key: LUCENE-9619
                 URL: https://issues.apache.org/jira/browse/LUCENE-9619
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Adrien Grand


Points' visitor API work well but there are a couple things we could make 
better if we moved to a cursor API, e.g.
 - Term queries could return a DocIdSetIterator without having to materialize a 
BitSet.
 - Nearest-neighbor search could work on top of the regular API instead of 
casting to BKDReader 
https://github.com/apache/lucene-solr/blob/6a7131ee246d700c2436a85ddc537575de2aeacf/lucene/sandbox/src/java/org/apache/lucene/sandbox/document/FloatPointNearestNeighbor.java#L296
 - We could optimize counting the number of matches of a query by adding the 
number of points in a leaf without visiting documents where there are no 
deleted documents and a leaf fully matches the query.



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