[LUCENE-10356] Special-case singleton doc values for general taxonomy facet counting

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 9.1, 10.0 (main)
• Component/s: modules/facet
• Lucene Fields: New
• Assignee: Greg Miller
• Reporter: Greg Miller
• Created: 04/Jan/22 23:42
• Updated: 28/Aug/22 16:34
• Resolved: 10/Jan/22 18:44

Description

Inspired by https://github.com/apache/lucene/pull/574, we should also special-case singleton dvs in the general count path (#573 specialized it for countAll).

Issue Links

• links to: GitHub Pull Request #585