[jira] [Updated] (SOLR-8998) JSON Facet API child roll-ups

["Dr Oleg Savrasov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-8998?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dr Oleg Savrasov updated SOLR-8998:
-----------------------------------
    Attachment: SOLR_8998.patch

Unfortunately definition like

facet: {
    productsCount: "unique(_root_)"
}

assumes iterating one by one through all the facet values and creating appropriate docset for each of them.
In order to leverage algorithm implemented in BlockJoinFieldFacetAccumulator, I propose to introduce a new keyword for JSON facet:

rollup : <Parent documents query>.

The example of request should look like:

curl http://localhost:8983/solr/collection1/query -d 'q={!parent which=type_s:parent}type_s:child&rows=0&
json.facet={
filter_by_children: {
type:query,
q:"type_s:child",
domain: { blockChildren : "type_s:parent" },
facet:{
colors:{
type : terms,
field : COLOR_s,
rollup : "type_s:parent"
},
sizes:{
type : terms,
field : SIZE_s,
rollup : "type_s:parent"
}}}}

The patch for proposed solution is attached. For the above request it returns

facets=={ count:1,
 filter_by_children:{count:2,
 colors:{buckets:[ {val:Blue, count:1, rollup:1},
                   {val:Red,  count:1, rollup:1} ]},
 sizes:{buckets:[  {val:XL,   count:2, rollup:1} ]}}}}

See TestFacetRollup.

> 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
>         Attachments: 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.



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