Steve Molloy created SOLR-4212:
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             Summary: Support for facet pivot query for filtered count
                 Key: SOLR-4212
                 URL: https://issues.apache.org/jira/browse/SOLR-4212
             Project: Solr
          Issue Type: Improvement
          Components: search
    Affects Versions: 4.0
            Reporter: Steve Molloy


Facet pivot provide hierarchical support for computing data used to populate a 
treemap or similar visualization. TreeMaps usually offer users extra 
information by applying an overlay color on top of the existing square sizes 
based on hierarchical counts. This second count is based on user choices, 
representing, usually with gradient, the proportion of the square that fits the 
user's choices.

The proposition is to add a facet.pivot.q parameter that would allow to specify 
a query (per field) that would be intersected with DocSet used to calculate 
pivot count, stored in separate q-count.

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