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https://issues.apache.org/jira/browse/SOLR-2898?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13258815#comment-13258815
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Martijn van Groningen commented on SOLR-2898:
---------------------------------------------

Bjorn: Right now I don't have an idea when this will be added. If you want you 
can make a new Jira issue to support grouped range and query facets.

David: The FacetComponent operates on a DocSet computed by the QueryComponent. 
Grouped facets works only as expected on the ungrouped DocSet which is created 
by default. The QueryComponent creates a grouped DocSet when group.truncate is 
enabled. So instead of creating one DocSet, the QueryComponent then needs to 
generate two DocSets (grouped & ungrouped), so that the StatsComponent can 
operate on the grouped DocSet when group.truncate is enabled and the 
FacetComponent can operate on the ungrouped docset when group.facet is enabled.
                
> 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
>             Fix For: 4.0
>
>         Attachments: SOLR-2898.patch, SOLR-2898.patch, SOLR-2898.patch, 
> SOLR-2898.patch
>
>
> Support grouped faceting. As described in LUCENE-3097 (matrix counts).

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