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Date: Sat, 21 Apr 2012 09:02:33 +0000 (UTC)
From: "Martijn van Groningen (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
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Subject: [jira] [Issue Comment Edited] (SOLR-2898) Support grouped faceting
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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 ] 

Martijn van Groningen edited comment on SOLR-2898 at 4/21/12 9:01 AM:
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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 and StatsComponent operate on a DocSet computed by the QueryComponent. The QueryComponent creates either a ungrouped DocSet or 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 ungrouped DocSet when group.truncate is enabled and the FacetComponent can operate on the grouped DocSet. This should be controlled with a special parameter. Maybe something like this: group.computeStats=GROUPED|UNGROUPED 
                
      was (Author: martijn.v.groningen):
    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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