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From "Toke Eskildsen (JIRA)" <>
Subject [jira] Created: (SOLR-2412) Multipath hierarchical faceting
Date Wed, 09 Mar 2011 10:40:59 GMT
Multipath hierarchical faceting

                 Key: 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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