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https://issues.apache.org/jira/browse/SOLR-2898?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martijn van Groningen updated SOLR-2898:
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    Attachment: SOLR-2898.patch

Attached a new patch that takes another approach. Patch contains the 
TermGroupFacetCollector class that performs the grouped faceting. Grouped 
faceting is now per segment instead of top level. Grouped faceting works the 
same as in the previous patch.

I think this approach is cleaner and grouped faceting isn't just a hack any 
more.

The TermGroupFacetCollector collector is located in the grouping module. I'll 
open a new Lucene issue with the purpose of getting this collector committed to 
the grouping module. This issue will then depend on the new Lucene issue.
                
> Support grouped faceting
> ------------------------
>
>                 Key: SOLR-2898
>                 URL: https://issues.apache.org/jira/browse/SOLR-2898
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Martijn van Groningen
>         Attachments: SOLR-2898.patch, SOLR-2898.patch, SOLR-2898.patch
>
>
> Support grouped faceting. As described in LUCENE-3097 (matrix counts).

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