Greg Miller created LUCENE-9952:
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Summary: FacetResult#value should consistently report doc count,
not field count
Key: LUCENE-9952
URL: https://issues.apache.org/jira/browse/LUCENE-9952
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}} is sometimes populated with the number of
_docs_ that contain a value, and other times is populated with the total number
of values. For single-valued cases, these two values are identical, but they
are not in multi-value cases. For example, if a multi-value doc has two value
for the same field being counted, it will count only once when doing a "doc
count," but twice if doing a "field count."
We should implement consistent behavior across all of our {{Facet}}
implementations. I propose that this behavior should be the doc count. If the
doc count isn't possible to calculate, we should populate {{FacetResult#value}}
with {{-1}} (which is what the taxonomy-based implementations currently do).
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