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https://issues.apache.org/jira/browse/SOLR-8998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15622209#comment-15622209
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Mikhail Khludnev commented on SOLR-8998:
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[[email protected]], is it possible to implement {{rollup(type_s:parent)}}
which does what {{unique(_root_)}} in a way how
{{o.a.s.s.join.BlockJoinFieldFacetAccumulator}} enumerating docset once,
without running through per value docsets one by one as it happens with
{{unique()}} now?
> 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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