The Postgres Pro 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