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https://issues.apache.org/jira/browse/SOLR-5002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13701953#comment-13701953
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Shalin Shekhar Mangar commented on SOLR-5002:
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[~thetaphi], the change log is not correct. On branch_4x, under 4.4 bug fixes I
can see SOLR-5002 but there is no such entry in the trunk change log. I noticed
this because of a merge conflict.
> 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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