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https://issues.apache.org/jira/browse/SOLR-5002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13701984#comment-13701984
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Robert Muir commented on SOLR-5002:
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guys please get your own issue! i will remove all these comments, they are
inappropriate here!
> optimize numDocs(Query,DocSet) when filterCache is null
> -------------------------------------------------------
>
> Key: SOLR-5002
> URL: https://issues.apache.org/jira/browse/SOLR-5002
> Project: Solr
> Issue Type: Improvement
> Reporter: Robert Muir
> Fix For: 5.0, 4.4
>
> Attachments: SOLR-5002.patch
>
>
> getDocSet(Query, DocSet) has this opto, but numDocs does not.
> Especially in this case, where we just want the intersection count, its
> faster to do a filtered query with TotalHitCountCollector and not create
> bitsets at all...
>
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