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From "Mikhail Khludnev (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-9510) child level facet exclusions
Date Fri, 21 Oct 2016 07:51:58 GMT

    [ https://issues.apache.org/jira/browse/SOLR-9510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15594398#comment-15594398
] 

Mikhail Khludnev commented on SOLR-9510:
----------------------------------------

Yep. It make sense. Keep going! Let me rephrase a little:

What we really need is a way to specify additional filters for -any- a few (child level) at
once facets and be able to pick some of them for exclusion. 

> 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
>
> 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|https://issues.apache.org/jira/browse/SOLR-8998?focusedCommentId=15487095&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15487095]
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 params=$child.fq excludeTags=color v=$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 {{params=$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}
> 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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