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https://issues.apache.org/jira/browse/LUCENE-9619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17243094#comment-17243094
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Ignacio Vera commented on LUCENE-9619:
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{quote}
my thinking was that this API could be use to fill an int[] buffer only one
leaf at a time
{quote}
With the visitor pattern there is no control to visit one leaf at a time. I am
wondering if it make more sense to have and IntersectsAll method that just
return a DocIdIdIterator. In addition the Intersects method can return a
DocSetIterator as well and accept a Predicate function. Something like:
/** Visit all (document,value) pairs under the current node and return only the
ones that match
the given predicate. The iterator will contain at most \{@link #size()}
elements. */ public abstract DocIdSetIterator intersect(Predicate<byte[]>
matchesPredicate);
/** Return all documents under the current node. The iterator will contain
\{@link #size()} elements. */ public abstract DocIdSetIterator intersectAll();
I am actually more concern about the optimisation where we added a exact
bounding box to the leaf nodes as it needs to be treated carefully.
> 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
> Priority: Minor
>
> 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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