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From "Hoss Man (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-4310) If groups.ngroups is specified, the docList's numFound should be the number of groups
Date Thu, 28 Feb 2013 19:51:12 GMT

    [ https://issues.apache.org/jira/browse/SOLR-4310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13589865#comment-13589865
] 

Hoss Man commented on SOLR-4310:
--------------------------------

Amit: distributed coordination code never uses DocLists and DocSlices directly (because those
are tied to the local index) so you should check the grouping code for SolrDocumentList objects
-- in particular look for usages of SolrDocumentList.setNumFound and SolrDocumentList.getNumFound
 

                
> If groups.ngroups is specified, the docList's numFound should be the number of groups
> -------------------------------------------------------------------------------------
>
>                 Key: SOLR-4310
>                 URL: https://issues.apache.org/jira/browse/SOLR-4310
>             Project: Solr
>          Issue Type: Improvement
>          Components: search
>    Affects Versions: 4.1
>            Reporter: Amit Nithian
>            Assignee: Hoss Man
>            Priority: Minor
>             Fix For: 4.2
>
>         Attachments: SOLR-4310_2.patch, SOLR-4310.patch
>
>
> If you group by a field, the response may look like this:
> <lst name="grouped">
> <lst name="series">
> <int name="matches">138</int>
> <int name="ngroups">1</int>
> <result name="doclist" numFound="138" start="0">
> <doc>
> <int name="id">267038365</int>
> <str name="name">
> Larry's Grand Ole Garage Country Dance - Pure Country
> </str>
> </doc>
> </result>
> </lst>
> </lst>
> and if you specify group.main then the doclist becomes the result and you lose all context
of the number of groups. If you want to keep your response format backwards compatible with
clients (i.e. clients who don't know about the grouped format), setting group.main=true solves
this BUT the numFound is the number of raw matches instead of the number of groups. This may
have downstream consequences.
> I'd like to propose that if the user specifies ngroups=true then when creating the returning
DocSlice, set the numFound to be the number of groups instead of the number of raw matches
to keep the response consistent with what the user would expect.

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