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https://issues.apache.org/jira/browse/SOLR-4212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14158374#comment-14158374
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Steve Molloy commented on SOLR-4212:
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That's what I'm starting to realize by looking into SOLR-6351... :) It makes a
lot of sense, I'll try to adapt and see if I can get facet ranges (SOLR-6353)
covered at the same time, they should be similar with your proposed approach.
> Support for facet pivot query for filtered count
> ------------------------------------------------
>
> Key: SOLR-4212
> URL: https://issues.apache.org/jira/browse/SOLR-4212
> Project: Solr
> Issue Type: Improvement
> Components: search
> Affects Versions: 4.0
> Reporter: Steve Molloy
> 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, 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 add a facet.pivot.q parameter that would allow to
> specify one or more queries (per field) that would be intersected with DocSet
> used to calculate pivot count, stored in separate qcounts list, each entry
> keyed by the query.
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