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https://issues.apache.org/jira/browse/LUCENE-8368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16522148#comment-16522148
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Robert Muir commented on LUCENE-8368:
-------------------------------------
Alan it doesn't hold me up here, and I havent looked outside of facets to see
what the impact would be. In general the numeric range stuff here is geared at
(potentially updatable) numericdv... but this is different enough in that it
isnt updateable and all the "ranges" are contiguous: probably best to just
tease it apart from that.
> facet by polygon
> ----------------
>
> Key: LUCENE-8368
> URL: https://issues.apache.org/jira/browse/LUCENE-8368
> Project: Lucene - Core
> Issue Type: New Feature
> Components: modules/facet
> Reporter: Robert Muir
> Priority: Major
> Attachments: LUCENE-8368.patch, LUCENE-8368_hacky_grid.patch,
> LUCENE-8368_hacky_grid.patch, LUCENE-8368_hacky_grid.patch
>
>
> This can give some nice flexibility if you are working with search results on
> a map. Of course if everything about your use-case is static, its better to
> compute this up-front and index string values, but its not always the case.
> Also it can be helpful if your polygons are changing often, since you don't
> have to reindex.
> Polygon2D already supports multipolygons, but today it only returns a boolean
> value. This patch adds a {{find}} method that returns the polygon that
> actually matched, or -1 if it doesn't match. {{contains}} is then just
> written as {{find >= 0}}.
> Then we can solve the problem with just some sugar over the existing range
> faceting, as each multipolygon is just a range of ids coming back from
> {{find}} that correspond with it. e.g. if you were faceting by country, you
> might have ~200 countries with 100,000 total polygons, and polygons
> 22,000-32,000 correspond to Canada or whatever.
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