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https://issues.apache.org/jira/browse/SOLR-12711?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16649537#comment-16649537
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Yonik Seeley commented on SOLR-12711:
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Could think of it like a block limit I guess. One way to specify would be a
sort and a limit (i.e. you could select the 3 latest child documents).
This could also be extended beyond blocks to buckets/domains.
> Count dominating child field values
> -----------------------------------
>
> Key: SOLR-12711
> URL: https://issues.apache.org/jira/browse/SOLR-12711
> Project: Solr
> Issue Type: New Feature
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Facet Module
> Reporter: Mikhail Khludnev
> Priority: Major
>
> h2. Context
> {{uniqueBlock(_root_)}} which was introduced in SOLR-8998 allows to count
> child field facet grouping hits by parents, ie hitting every parent only once.
> h2. Problem
> How to count only dominating child field value. ie if a product has 5 Red
> skus and 2 Blue, it contributes {{Red(1)}}, {{Blue(0)}}
> h2. Suggestion
> Introduce {{dominatingBlock(_root_)}} which aggregate hits per parent,
> chooses the dominating one and incs only it.
> h2. Further Work
> Judge dominating value not by number of child hits, but by the given function
> value. Like pick the most popular, best selling, random child field value as
> dominating.
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