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https://issues.apache.org/jira/browse/SOLR-11695?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16269554#comment-16269554
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Yonik Seeley commented on SOLR-11695:
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We already use "count" for the number of documents in a bucket, so for the
non-unique number of values, how about something like nvals or nvalues or
numvals?
For a terms facet, there is missing:true which creates a missing bucket that
has all sub-facets as well as the count. But you're right that we should have
a missing function as well (one could do it themselves as a query sub0facet of
"-field:[* TO *]", but we should make it easier and more functional).
> 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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