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https://issues.apache.org/jira/browse/SOLR-12398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16520321#comment-16520321
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David Smiley commented on SOLR-12398:
-------------------------------------

Updated patch with Solr Ref Guide stuff.
 * New section on the JSON Facet API page.  It has an example request & 
response, though I didn't document the parameters here – instead I pointed to 
the existing docs on the Spatial Search page.
 * Updated the Spatial Search page's heatmap section to note the existence of 
the JSON Facet API as an option.

Precommit is happy and tests pass so I think it's all committable.

> Make JSON Facet API support Heatmap Facet
> -----------------------------------------
>
>                 Key: SOLR-12398
>                 URL: https://issues.apache.org/jira/browse/SOLR-12398
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: Facet Module, faceting, JSON Request API, spatial
>            Reporter: Jaime Yap
>            Assignee: David Smiley
>            Priority: Major
>              Labels: heatmap
>         Attachments: SOLR-12398.patch, SOLR-12398.patch
>
>
> The JSON query Facet API does not support Heatmap facets. For companies that 
> have standardized around generating queries for the JSON query API, it is a 
> major wart to need to also support falling back to the param encoding API in 
> order to make use of them.
> More importantly however, given it's more natural support for nested 
> subfacets, the JSON Query facet API is be able to compute more interesting 
> Heatmap layers for each facet bucket. Without resorting to the older (and 
> much more awkward) facet pivot syntax.



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