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https://issues.apache.org/jira/browse/LUCENE-6754?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand updated LUCENE-6754:
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Attachment: LUCENE-6754.patch
Here is a patch. count(MatchAllDocsQuery) returns reader.numDocs() and
count(TermQuery) returns the sum of the doc freqs if there are no deletions.
> Optimize IndexSearcher.count for simple queries
> -----------------------------------------------
>
> Key: LUCENE-6754
> URL: https://issues.apache.org/jira/browse/LUCENE-6754
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-6754.patch
>
>
> IndexSearcher.count currently always create a collector to compute the number
> of hits, but it could optimize some queries like MatchAllDocsQuery or
> TermQuery.
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