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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_ginB-tree equivalent functionality for several data types
hstoreModule for storing (key, value) pairs
intarrayEnhanced support for int[]
pg_trgmText similarity using trigram matching
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