PostgreSQL 9.1.2 Documentation
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# 54.6. Examples

The PostgreSQL source distribution includes GIN operator classes for `tsvector` and for one-dimensional arrays of all internal types. Prefix searching in `tsvector` is implemented using the GIN partial match feature. The following `contrib` modules also contain GIN operator classes:

`btree_gin`

  B-tree equivalent functionality for several data types

`hstore`

  Module for storing (key, value) pairs

`intarray`

  Enhanced support for `int[]`

`pg_trgm`

  Text similarity using trigram matching

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