Multipath hierarchical faceting
-------------------------------

                 Key: SOLR-2412
                 URL: https://issues.apache.org/jira/browse/SOLR-2412
             Project: Solr
          Issue Type: New Feature
          Components: SearchComponents - other
    Affects Versions: 4.0
         Environment: Fast IO when huge hierarchies are used
            Reporter: Toke Eskildsen


Hierarchical faceting with slow startup, low memory overhead and fast response. 
Distinguishing features as compared to SOLR-64 and SOLR-792 are

  * Multiple paths per document
  * Query-time analysis of the facet-field; no special requirements for 
indexing besides retaining separator characters in the terms used for faceting
  * Optional custom sorting of tag values
  * Recursive counting of references to tags at all levels of the output

This is a shell around LUCENE-2369, making it work with the Solr API. The 
underlying principle is to reference terms by their ordinals and create an 
index wide documents to tags map, augmented with a compressed representation of 
hierarchical levels.

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