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https://issues.apache.org/jira/browse/LUCENE-9620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17395870#comment-17395870
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Adrien Grand commented on LUCENE-9620:
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Hi [~gworah]. Actually I was thinking of keeping {{IndexSearcher#count}},
similarly to how we have {{IndexSearcher#search(Query, int)}} even though it is
possible to do the same easily by creating a collector. I like that Lucene
makes it simple to do simple things like counting hits or fetching top hits
without having to use experimental APIs like Weight and Collector.
> Add Weight#count(LeafReaderContext)
> -----------------------------------
>
> Key: LUCENE-9620
> URL: https://issues.apache.org/jira/browse/LUCENE-9620
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
>
> We have IndexSearcher#count today, which tries to optimize counting for
> TermQuery and MatchAllDocsQuery, and falls back to BulkScorer +
> TotalHitCountCollector otherwise.
> I'm considering moving this to Weight instead, where it'd be a better place
> to add counting optimizations for other queries, e.g. pure disjunctions over
> single-valued fields or range queries on points. The default implementation
> could use a BulkScorer+TotalHitCountCollector like IndexSearcher#count does
> today.
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