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https://issues.apache.org/jira/browse/SOLR-12398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16702007#comment-16702007
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ASF subversion and git services commented on SOLR-12398:
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Commit e466b007619b9f1235ab87a6c029e6da3a5fb9e8 in lucene-solr's branch
refs/heads/branch_7x from [~dsmiley]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=e466b00 ]
SOLR-12398: retroactively add CHANGES.txt back-compat break for 7.5
(cherry picked from commit 2611c22b6b00d73f6ae1fc6996e029f73ee7458d)
> 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
> Fix For: 7.5
>
> Attachments: SOLR-12398.patch, SOLR-12398.patch,
> repro-facet-heatmaps-response-format-change.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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