Multipath hierarchical faceting
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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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