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PostgreSQL 8.4.22 Documentation
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52.6. 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 int4[]
pg_trgm: Text similarity using trigram matching

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