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https://issues.apache.org/jira/browse/SOLR-2564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13048307#comment-13048307
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Michael McCandless commented on SOLR-2564:
------------------------------------------

Patch looks great Martijn... only thing pending (I think?) is to perhaps 
disable caching collector when the query is MatchAllDocsQuery instance, since 
we know cache only hurts perf in this case.

Else, +1 to commit!  I don't think we should hold this pending the Java 1.6 
discussion.

> 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
>            Priority: Blocker
>             Fix For: 4.0
>
>         Attachments: LUCENE-2564.patch, SOLR-2564.patch, SOLR-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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