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https://issues.apache.org/jira/browse/SOLR-8998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16465131#comment-16465131
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ASF subversion and git services commented on SOLR-8998:
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Commit beaf3a47ebe6ad79572bccaeafc2551dc86f19c6 in lucene-solr's branch
refs/heads/master from [~mkhludnev]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=beaf3a4 ]
SOLR-8998: documentation fix.
> 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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