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https://issues.apache.org/jira/browse/SOLR-2564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13045002#comment-13045002
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Yonik Seeley commented on SOLR-2564:
------------------------------------

Browsing around this a bit more... the existing solr code selected the string 
based collectors for any ValueSource of StrFieldSource.  This patch resorts to 
exact getClass() checks against string and text fields which won't match in as 
many cases (either derived fields, or user custom fields that don't derive from 
either of the these field types)

> Integrating grouping module into Solr 4.0
> -----------------------------------------
>
>                 Key: SOLR-2564
>                 URL: https://issues.apache.org/jira/browse/SOLR-2564
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Martijn van Groningen
>            Assignee: Martijn van Groningen
>             Fix For: 4.0
>
>         Attachments: LUCENE-2564.patch, SOLR-2564.patch, SOLR-2564.patch, 
> SOLR-2564.patch, SOLR-2564.patch
>
>
> Since work on grouping module is going well. I think it is time to wire this 
> up in Solr.
> Besides the current grouping features Solr provides, Solr will then also 
> support second pass caching and total count based on groups.

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