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Supported versions: 16 / 15 / 14
Unsupported versions: 13 / 12 / 11 / 10 / 9.6 / 9.5 / 9.4 / 9.3 / 9.2
Historical version. PostgreSQL 9.5 reached end of support in February 2021. See the current manual for supported releases.
PostgreSQL 9.5.25 Documentation
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60.5. 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.

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