Greg Miller created LUCENE-9953:
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Summary: FacetResult#value is inaccurate in LongValueFacetCounts
for multi-value docs
Key: LUCENE-9953
URL: https://issues.apache.org/jira/browse/LUCENE-9953
Project: Lucene - Core
Issue Type: Bug
Components: modules/facet
Affects Versions: 8.9
Reporter: Greg Miller
As described in a dev@ list
[thread|http://mail-archives.apache.org/mod_mbox/lucene-dev/202105.mbox/%3CCANJ0CDo-9zt0U_pxWNOBkfiJpaAXZGGwOEJPnENAP6JzWz_t9Q%40mail.gmail.com%3E],
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.
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