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https://issues.apache.org/jira/browse/SOLR-8998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15487095#comment-15487095
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Mikhail Khludnev commented on SOLR-8998:
----------------------------------------
ok. one more try with parent level query. Here is how we can calculate child
level facet with roll up to parents (see {{in_books}} below), and get
exclusions for them too. .The idea is that when we calculate child level facets
we can apply a necessary subset of child filters via {{{type:query, q:"foo",
domain:{blockChildren:".."}}}}. ie. it's done via manual inclusion instead of
_exclusion_.
Beware of + to %2B escaping. Child level filters can be cached with
{{filter(..)}}, then they can be referred with {{\{!v=$childq}}} instead of
repeating.
{code}
q={!parent which=type_s:book}comment_t:* %2Bauthor_s:yonik %2Bstars_i:(5
3)&wt=json&indent=on&rrrows=0&json.facet={
comments_for_author:{
type:query,
q:"comment_t:* %2Bstars_i:(5 3)",
"//note":"author filter is excluded",
domain:{
blockChildren:"type_s:book"
}, facet:{
authors:{
type:terms,
field:author_s,
facet: {
in_books: "unique(_root_)"
}
}
}
} ,
comments_for_stars:{
type:query,
q:"comment_t:* %2Bauthor_s:yonik",
"//note":"stars_i filter is excluded",
domain:{
blockChildren:"type_s:book"
}, facet:{
stars:{
type:terms,
field:stars_i,
facet: {
in_books: "unique(_root_)"
}
}
}
}
}
{code}
> 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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