[jira] [Commented] (SOLR-5002) optimize numDocs(Query,DocSet) when filterCache is null

["Uwe Schindler (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-5002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13699788#comment-13699788 ] 

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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