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https://issues.apache.org/jira/browse/SOLR-11695?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16970788#comment-16970788
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Munendra S N commented on SOLR-11695:
-------------------------------------

I have created sub-task SOLR-13912 and SOLR-13913 for missing and count 
aggregation support respectively.

> 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
>          Components: Facet Module
>            Reporter: Chris M. Hostetter
>            Priority: Major
>
> 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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