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https://issues.apache.org/jira/browse/SOLR-2564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13045027#comment-13045027
 ] 

Yonik Seeley commented on SOLR-2564:
------------------------------------

I've been checking out the performance, and it generally seems fine.  But of 
course we normally short circuit based on comparators and often don't get 
beyond that... so to exercise & isolate the rest of the code, I tried a 
worst-case scenario where the short circuit wouldn't work (sort=_docid_ desc) 
and solr trunk with this patch is ~16% slower than without it.  Any ideas what 
the problem might be?

{code}
http://localhost:8983/solr/select?q=*:*&sort=_docid_ 
desc&group=true&group.cacheMB=0&group.field=single1000_i
{code}

Note: the single1000_i field is a single valued int field with 1000 unique 
values

> 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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