Robert Muir created LUCENE-8368:
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Summary: 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
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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