[LUCENE-9953] FacetResult#value is inaccurate in LongValueFacetCounts for multi-value docs

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 8.9
• Fix Version/s: 8.9
• Component/s: modules/facet
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Greg Miller
• Created: 10/May/21 18:50
• Updated: 28/Aug/22 16:21
• Resolved: 18/May/21 16:52

Description

As described in a dev@ list thread, the value of FacetResult#value should reflect the number of docs containing at least one value in a given facet path. LongValueFacetCounts counts the number of values contributed by all docs. In cases where all docs contain a single value, this is fine, but if a doc contains multiple values, FacetResult#value will be incorrect.

This is a simple fix so I think we can include it in 8.9.

Note: Spinning this off from LUCENE-9952 since fixing this for all cases (particularly SSDV) is trickier and may require non-backwards compatible changes.

Issue Links

• links to: GitHub Pull Request #131
• links to: GitHub Pull Request #2491