September 26, 2024: PostgreSQL 17 Released!
Supported Versions: 16 / 15 / 14 / 13 / 12
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56.4. 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.