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https://issues.apache.org/jira/browse/SOLR-4212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14383792#comment-14383792
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Steve Molloy commented on SOLR-4212:
------------------------------------

Indeed, we need to find a way to reconcile, but as the JSON API will be 
experimental in 5.1, I don't think we should stop this new functionality from 
getting in. It's in line with all the other work under this unbrella, some of 
which is already in 5.0. Whether it ends up in Lucene, Solr facet component or 
facet module, the functionality is something needed and I don't think we should 
hold it up as it is still the official facet implementation after all...

> Let facet queries hang off of pivots
> ------------------------------------
>
>                 Key: SOLR-4212
>                 URL: https://issues.apache.org/jira/browse/SOLR-4212
>             Project: Solr
>          Issue Type: Sub-task
>          Components: search
>    Affects Versions: 4.0
>            Reporter: Steve Molloy
>            Assignee: Shalin Shekhar Mangar
>             Fix For: 4.9, Trunk
>
>         Attachments: SOLR-4212-multiple-q.patch, SOLR-4212-multiple-q.patch, 
> SOLR-4212.patch, SOLR-4212.patch, SOLR-4212.patch, SOLR-4212.patch, 
> SOLR-4212.patch, SOLR-4212.patch, SOLR-6353-6686-4212.patch, 
> SOLR-6353-6686-4212.patch, patch-4212.txt
>
>
> Facet pivot provide hierarchical support for computing data used to populate 
> a treemap or similar visualization. TreeMaps usually offer users extra 
> information by applying an overlay color on top of the existing square sizes 
> based on hierarchical counts. This second count is based on user choices, 
> representing, usually with gradient, the proportion of the square that fits 
> the user's choices.
> The proposition is to use local parameters to specify facet query to apply 
> for pivot which matches a tag set on facet query. Parameter format would look 
> like:
> facet.pivot={!query=r1}category,manufacturer
> facet.query={!tag=r1}somequery
> facet.query={!tag=r1}somedate:[NOW-1YEAR TO NOW]



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