[jira] [Commented] (SOLR-4310) If groups.ngroups is specified, the docList's numFound should be the number of groups

["Tomás Fernández Löbbe (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-4310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13555349#comment-13555349 ] 

Tomás Fernández Löbbe commented on SOLR-4310:
---------------------------------------------

+1 on the idea. I always thought this is how it should work in this case.
                
> 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
>            Priority: Minor
>             Fix For: 4.1
>
>         Attachments: 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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