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https://issues.apache.org/jira/browse/SOLR-8998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15243133#comment-15243133
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Yonik Seeley commented on SOLR-8998:
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Desirable features:
- ability to "pretend" that parent documents have all values of their child
documents ( a union() set rollup?)
- numeric rollups (min, max, avg, etc) and the ability to use range faceting
over these values
Ideas:
- we already have a syntax for rolling up values over a bucket (avg(field1),
min(field2) etc), re-use that as much as possible
Use cases:
We have products, which have multiple SKUs, and we want to facet by color on
the products.
{code}
Parent1: { type:product, name:"Solr T-Shirt" }
Child1: { type:SKU, size:L, color:Red, inStock:true}
Child2: { type:SKU, size:L, color:Blue, inStock:false}
Child3: { type:SKU, size:M, color:Red, inStock:true}
Child4: { type:SKU, size:S, color:Blue, inStock:true}
Now, we want to facet by "color" and get back numbers of products (not number
of SKUs). Hence if our query is inStock:true, we want {Blue:1 and Red:1}.
Put another way, we want a virtual "color" field on Parent1 containing all the
colors of matching child documents.
{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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