[SOLR-2412] Multipath hierarchical faceting

• Type: New Feature
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 4.0
• Component/s: SearchComponents - other
• Labels: contrib patch

Environment

Fast IO when huge hierarchies are used

• Assignee: Unassigned
• Reporter: Toke Eskildsen
• Created: 09/Mar/11 10:39
• Updated: 18/Nov/14 23:24

Description

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.