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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 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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