groonga/groonga — pull request #25 by kou (2012-08-10 08:28:32+00:00)
Title: Support custom selector definition

Selector is a function that collects matched records into resultset
table. Selector works fast because it can use index.

geo_in_circle() and geo_in_rectangle() are existing selectors. They
are defined by the mechanism intruduced in the change.