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https://issues.apache.org/jira/browse/LUCENE-5735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14238045#comment-14238045
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David Smiley commented on LUCENE-5735:
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Hello [~shaie]. I did take a quick look even before your suggestion now and
there isn't much congruency between both. For one thing, the facet module
yields a LabelAndValue for each count yet for the faceting I did, I
deliberately avoided computing the label String for each value and instead
return a int[] for a higher level bucket. So if you facet by day, you'll get a
month "parent" with a label and an int array of size 31 (or sometimes 30 or
28). Also, I don't know what to make of the "dim" and "path" stuff. So it
doesn't seem like a good fit, and might erroneously suggest to users some sort
of integration with the facets module that doesn't actually exist.
> 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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