Very cool!

What you've essentially described is a way of indexing & searching lat-lon
box shapes, and the cool thing is that you were able to do this without
custom coding / hacking of Solr.  Sweet!  I do have some observations about
this approach:
1. Doesn't support variable number of shapes per document. (LatLonType
doesn't either, by the way)
2. The use of function queries on CenterX, CenterY, HalfWidth, and
HalfHeight means that all these values (just the distinct ones) will be put
into RAM in Lucene's FieldCache.  Not a big deal but something to be noted.
3. The function query is going to be evaluated on every document matching
the keyword search.  That will probably perform okay; not so sure for large
indexes with a *:* query.

Again, nice job.  Could you please share an example of your ranking query?

~ David Smiley

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 Author: https://www.packtpub.com/solr-1-4-enterprise-search-server/book
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