[jira] [Commented] (SOLR-8998) JSON Facet API child roll-ups

["Mikhail Khludnev (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-8998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15622209#comment-15622209 ] 

Mikhail Khludnev commented on SOLR-8998:
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[~yseeley@gmail.com], 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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