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https://issues.apache.org/jira/browse/LUCENE-5735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14238022#comment-14238022
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Shai Erera commented on LUCENE-5735:
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Would it make sense to use the facet/ module Facets and FacetResult? I haven't
looked at the patch, but if we can, it will be good since those facets could be
used together with other facets (e.g. range faceting on numeric fields).
> Faceting for DateRangePrefixTree
> --------------------------------
>
> Key: LUCENE-5735
> URL: https://issues.apache.org/jira/browse/LUCENE-5735
> Project: Lucene - Core
> Issue Type: New Feature
> Components: modules/spatial
> Reporter: David Smiley
> Assignee: David Smiley
> Attachments: LUCENE-5735.patch
>
>
> The newly added DateRangePrefixTree (DRPT) encodes terms in a fashion
> amenable to faceting by meaningful time buckets. The motivation for this
> feature is to efficiently populate a calendar bar chart or
> [heat-map|http://bl.ocks.org/mbostock/4063318]. It's not hard if you have
> date instances like many do but it's challenging for date ranges.
> Internally this is going to iterate over the terms using seek/next with
> TermsEnum as appropriate. It should be quite efficient; it won't need any
> special caches. I should be able to re-use SPT traversal code in
> AbstractVisitingPrefixTreeFilter. If this goes especially well; the
> underlying implementation will be re-usable for geospatial heat-map faceting.
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