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From "Munendra S N (Jira)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-11695) JSON FacetModule needs equivilents for StatsComponent's "count" and "missing" features
Date Sat, 09 Nov 2019 13:00:00 GMT

    [ 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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