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https://issues.apache.org/jira/browse/SOLR-8998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16465528#comment-16465528
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Mikhail Khludnev edited comment on SOLR-8998 at 5/7/18 2:23 PM:
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Further improvement might be:
* handling numeric fields in {{uniqueBlock(id)}} SOLR-12324
* using filters for aggregating hits for better performance eg 
{{uniqueBlockQuery(parent:true)}} SOLR-12325
I'm not able to work on it soon.  


was (Author: mkhludnev):
Further improvement might be:
* handling numeric fields in {{uniqueBlock(id)}}
* using filters for aggregating hits for better performance eg 
{{uniqueBlockQuery(parent:true)}}
I can create issues for those who want to take part. I'm not able to work on it 
soon.  

> JSON Facet API child roll-ups
> -----------------------------
>
>                 Key: SOLR-8998
>                 URL: https://issues.apache.org/jira/browse/SOLR-8998
>             Project: Solr
>          Issue Type: New Feature
>          Components: Facet Module
>            Reporter: Yonik Seeley
>            Assignee: Mikhail Khludnev
>            Priority: Major
>             Fix For: 7.4, master (8.0)
>
>         Attachments: SOLR-8998-api-doc.patch, SOLR-8998-doc.patch, 
> SOLR-8998.patch, SOLR-8998.patch, SOLR-8998.patch, SOLR_8998.patch, 
> SOLR_8998.patch, SOLR_8998.patch
>
>
> The JSON Facet API currently has the ability to map between parents and 
> children ( see http://yonik.com/solr-nested-objects/ )
> This issue is about adding a true rollup ability where parents would take on 
> derived values from their children.  The most important part (and the most 
> difficult part) will be the external API.
> [~mkhludnev] says
> {quote}
> The bottom line is to introduce {{uniqueBlock(\_root_)}} aggregation, which 
> is supposed to be faster than {{unique(\_root_)}} and purposed for blocked 
> index only. For now it it supports singlevalue string fields, docValues 
> usually make sense.   
> {quote}



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