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https://issues.apache.org/jira/browse/LUCENE-5735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14311747#comment-14311747
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ASF subversion and git services commented on LUCENE-5735:
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Commit 1658300 from [~dsmiley] in branch 'dev/branches/branch_5x'
[ https://svn.apache.org/r1658300 ]
LUCENE-5735: spatial PrefixTreeFacetCounter (for faceting on SpatialPrefixTrees)
> 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
> Fix For: 5.x
>
> Attachments: LUCENE-5735.patch, LUCENE-5735.patch,
> LUCENE-5735__PrefixTreeFacetCounter.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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