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https://issues.apache.org/jira/browse/SOLR-5002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13699788#comment-13699788
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Uwe Schindler commented on SOLR-5002:
-------------------------------------
bq. one trick is we cant actually use FilteredQuery because of some sneaky
stuff in UninvertedField (which also uses this method). See the comment.
I am nervous if this is a hidden bug in solr that could be affect other stuff.
If a UninvertedField.doNegative() handles deleted documents in a wrong way and
you are able to create a filter out of it, it could lead to wrong results, if
the filter is applied down-low (random access).
> 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
> 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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