[LUCENE-10484] Add support for concurrent facets random sampling

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 9.2
• Component/s: modules/facet
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Luca Cavanna
• Created: 25/Mar/22 10:25
• Updated: 28/Aug/22 16:38
• Resolved: 05/Apr/22 06:54

Description

While FacetsCollectorManager exists to allows users to concurrently do facets collection through FacetsCollector, RandomSamplingFacetsCollector does not have a corresponding collector manager that easily allows users to concurrently do random sampling. The needed collector manager would be very similar to FacetsCollectorManager, yet it would need to expose a specialized reduced RandomSamplingFacetsCollector, and the reduction should call getOriginalMatchingDocs instead of getMatchingDocs, which modifies the internal totalHits when called.

This relates to LUCENE-10002 and would allow to use a collector manager instead of a collector when doing random sampling, in the effort of reducing usages of IndexSearcher#search(Query, Collector).

Issue Links

• links to: GitHub Pull Request #765