63.7. 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 - int[]
- pg_trgm
- Text similarity using trigram matching