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https://issues.apache.org/jira/browse/LUCENE-9620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17417802#comment-17417802
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Gautam Worah commented on LUCENE-9620:
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Thanks for the bug-fix [~jpountz]. I should've been more careful with the
docs=0 case!
> 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
> Fix For: main (9.0)
>
> Time Spent: 4h 40m
> Remaining Estimate: 0h
>
> 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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