PostgreSQL 8.4.2 Documentation
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# 51.4. Examples

The PostgreSQL source distribution includes several examples of index methods implemented using GiST. The core system currently provides text search support (indexing for `tsvector` and `tsquery`) as well as R-Tree equivalent functionality for some of the built-in geometric data types (see `src/backend/access/gist/gistproc.c`). The following `contrib` modules also contain GiST operator classes:

btree_gist

  B-Tree equivalent functionality for several data types

cube

  Indexing for multidimensional cubes

hstore

  Module for storing (key, value) pairs

intarray

  RD-Tree for one-dimensional array of int4 values

ltree

  Indexing for tree-like structures

pg_trgm

  Text similarity using trigram matching

seg

  Indexing for "float ranges"

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