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https://issues.apache.org/jira/browse/SOLR-13912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16972054#comment-16972054
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Chris M. Hostetter commented on SOLR-13912:
-------------------------------------------

Munendra: I skimmed your patch w/o testing it in depth -- here are some misc 
thoughts....

* I'm surprised by the need for the new classes BaseDVAcc, CountMultiValuedAcc, 
SortedSetDVAcc, & SortedNumericAcc -- all of which are specific to 
CountValsAgg.  do we not have any existing general purpose abstractions for the 
differences between Accumulating values over SortedSetDV, SortedNumericDV that 
could be reuse here w/simple subclasses the _only_ worry about the "counting"
* new aggregations need to be covered in the ref guide: 
https://lucene.apache.org/solr/guide/8_2/json-facet-api.html#stat-facet-functions
* as noted in the parent issue SOLR-11695 we have existing commented out test 
coverage adapted from legacy facts+stats testing that refers to {{SOLR-1169}} 
in java comments -- if we're adding this functionality now, then those tests 
should be un-commented (and pass)

> Support Count aggregation in JSON facet module
> ----------------------------------------------
>
>                 Key: SOLR-13912
>                 URL: https://issues.apache.org/jira/browse/SOLR-13912
>             Project: Solr
>          Issue Type: Sub-task
>          Components: Facet Module
>            Reporter: Munendra S N
>            Priority: Major
>         Attachments: SOLR-13912.patch
>
>
> Add a count aggregation in JSON Facet module which behaves similar to 
> StatsComponent's count



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