30th September 2021: PostgreSQL 14 Released!
Supported Versions: Current (14) / 13 / 12 / 11 / 10 / 9.6
Development Versions: devel
Unsupported versions: 9.5 / 9.4 / 9.3 / 9.2
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You may want to view the same page for the current version, or one of the other supported versions listed above instead.

57.5. Examples

The PostgreSQL source distribution includes several examples of index operator classes for SP-GiST. The core system currently provides radix trees over text columns and two types of trees over points: quad-tree and k-d tree. Look into src/backend/access/spgist/ to see the code.