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https://issues.apache.org/jira/browse/SOLR-9510?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mikhail Khludnev resolved SOLR-9510.
------------------------------------
       Resolution: Fixed
    Fix Version/s: master (8.0)
                   7.3

> child level facet exclusions
> ----------------------------
>
>                 Key: SOLR-9510
>                 URL: https://issues.apache.org/jira/browse/SOLR-9510
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: Facet Module, faceting, query parsers
>            Reporter: Mikhail Khludnev
>            Priority: Major
>             Fix For: 7.3, master (8.0)
>
>         Attachments: SOLR-9510.patch, SOLR_9510.patch, SOLR_9510.patch, 
> SOLR_9510.patch, SOLR_9510.patch, SOLR_9510.patch, SOLR_9510.patch, 
> SOLR_9510.patch, SOLR_9510.patch, SOLR_9510.patch, SOLR_9510.patch, 
> SOLR_9510.patch, SOLR_9510.patch, SOLR_9510.patch, SOLR_9510.patch, 
> SOLR_9510.patch
>
>
> h2. Challenge
>  * Since SOLR-5743 achieved block join child level facets with counts roll-up 
> to parents, there is a demand for filter exclusions.
> h2. Context
>  * Then, it's worth to consider JSON Facets as an engine for this 
> functionality rather than support a separate component.
>  * During a discussion in SOLR-8998 a solution for block join with child 
> level exclusion has been found.
> h2. Proposal
> It's proposed to provide a bit of syntax sugar to make it user friendly, 
> believe it or not.
> h2. List of improvements
>  * introducing a local parameter {{filters}} for {{{!parent}} query parser 
> referring to _multiple_ filters queries via parameter name: {{{!parent 
> filters=$child.fq ..}..&child.fq=color:Red&child.fq=size:XL}}
>  these _filters_ are intersected with a child query supplied as a subordinate 
> clause.
>  * introducing \{{{!filters param=$child.fq excludeTags=color 
> v=$subq}&subq=text:word&child.fq= \{!tag=color}color:Red&child.fq=size:XL}} 
> it intersects a subordinate clause (here it's {{subq}} param, and the trick 
> is to refer to the same query from {{{!parent}}}), with multiple filters 
> supplied via parameter name {{param=$child.fq}}, it also supports 
> {{excludeTags}}.
> h2. Notes
> Regarding the latter parser, the alternative approach might be to move into 
> {{domain:{..}}} instruction of json facet. From the implementation 
> perspective, it's desired to optimize with bitset processing, however I 
> suppose it's might be deferred until some initial level of maturity.
> h2. Example
> {code:java}
> q={!parent which=type_s:book filters=$child.fq 
> v=$childquery}&childquery=comment_t:good&child.fq={!tag=author}author_s:yonik&child.fq={!tag=stars}stars_i:(5
>  3)&wt=json&indent=on&json.facet={
> comments_for_author:{
>   type:query,
>   q:"{!filters params=$child.fq excludeTags=author v=$childquery}",
>   "//note":"author filter is excluded",
>   domain:{
>      blockChildren:"type_s:book",
>      "//":"applying filters here might be more promising"
>    }, facet:{
>    authors:{
>       type:terms,
>       field:author_s,
>       facet: {
>           in_books: "unique(_root_)"
>         }
>     }
>    }
> } ,
> comments_for_stars:{
>   type:query,
>  q:"{!filters params=$child.fq excludeTags=stars v=$childquery}",
>   "//note":"stars_i filter is excluded",
>   domain:{
>      blockChildren:"type_s:book"
>    }, facet:{
>    stars:{
>       type:terms,
>       field:stars_i,
>       facet: {
>           in_books: "unique(_root_)"
>         }
>     }
>   }
> }
> }
> {code}
> Votes? Opinions?



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