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https://issues.apache.org/jira/browse/SOLR-8998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15483290#comment-15483290
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Mikhail Khludnev commented on SOLR-8998:
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bq. query facet that does the block join child->parent
but it returns only parent count, there will be no fields, nor relevancy ranking
bq. topdocs() to get the top parents
however SOLR-7830 is still in progress
bq. field facet (a sub-facet) on the parents (including any rollups)
I might not understand correctly but it may return all ids, without any other
fields beside, and there is no ranking again.
What's is the most probable direction?
> 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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