Hoss Man created SOLR-11695:
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Summary: JSON FacetModule needs equivilents for StatsComponent's
"count" and "missing" features
Key: SOLR-11695
URL: https://issues.apache.org/jira/browse/SOLR-11695
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Reporter: Hoss Man
StatsComponent supports stats named "count" and "missing":
* count: for the set of documents we're computing stats over, "how many
_non-distinct_ values exist in those documents in the specified field?" (or in
the case of an arbitrary function: "in how many of these documents does
true==ValueSource.exist()" ?)
** no to be confused with the number of _unique_ values (aprox "cardinality" or
exact "countDistinct")
* missing: for the set of documents we're computing stats over, "how many of
those documents do not have any value in the specified field?" (or in the case
of an arbitrary function: "in how many of thse documents does
false==ValueSource.exist()" ?)
(NOTE: for a single valued field, these are essentially inveses of each other,
but for multivalued fields "count" actaully returns the total number of "value
instances" not just the number of docs that have at least one value)
AFAICT there is no equivalent functionality supported by the JSON FacetModule,
which will be a blocker preventing some users from migrating from using
stats.field (or facet.pivot+stats.field) to json.facet.
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