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Historical version. PostgreSQL 8.3 reached end of support in February 2013. See the current manual for supported releases.
PostgreSQL 8.3.23 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. The following contrib modules also contain GIN operator classes:

hstore

Module for storing (key, value) pairs

intarray

Enhanced support for int4[]

pg_trgm

Text similarity using trigram matching

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