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_gistB-tree equivalent functionality for several data types
cubeIndexing for multidimensional cubes
hstoreModule for storing (key, value) pairs
intarrayRD-Tree for one-dimensional array of int4 values
ltreeIndexing for tree-like structures
pg_trgmText similarity using trigram matching
segIndexing for “float ranges”
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