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http://issues.apache.org/jira/browse/SOLR-64?page=comments#action_12446675 ] 
            
Yonik Seeley commented on SOLR-64:
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Strict Facet Hierarchies:
- a response format that can more efficiently encapsulate hierarchies
  - maybe format flexible enough to encompass other hierarchies (non-tree, 
defined via solrconfig.xml, etc)
- strict hierarchy field faceting, with a single field value per document 
containing all the ordered constraints (a path)
  -  ability to select depth to return to the client
  - perhaps an ability to select a variable depth based on the number of items 
selected at that node
    - expand node if count > 100.... or maybe expand node if count > 10% of hits

http://www.nabble.com/Hierarchical-Facets--tf2560327.html#a7135353

> strict hierarchical facets
> --------------------------
>
>                 Key: SOLR-64
>                 URL: http://issues.apache.org/jira/browse/SOLR-64
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>            Reporter: Yonik Seeley
>
> Strict Facet Hierarchies... each tag has at most one parent (a tree).

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