The core PostgreSQL distribution includes the GIN operator classes previously shown in Table 66.1. 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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https://www.postgresql.org/docs/13/gin-examples.html