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https://issues.apache.org/jira/browse/SOLR-8998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15652081#comment-15652081
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Nikita Pchelintsev commented on SOLR-8998:
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Very promising solution, I've tried it on my own setup and one problem I see
with it is that the exclusions work differently to the way "normal"
(non-BlockJoin) exclusions do. Normal exclusions allow to go beyond the root
domain and widen it before calculating facets. As I understand, JSON Facet API
doesn't allow that and the above exclusions only exclude children documents
from the otherwise fixed parent document set. Or am I missing something?
> 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
>
> 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.
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