What data types are supported and can be used in GIN indexes?

GIN indexes (Generalized Inverted Index) in PostgreSQL support a wide range of data types, especially those used for full-text search and working with arrays or JSON.

Main data types that can be indexed with GIN:

• Arrays (int[], text[], etc.) of various types.
• JSON and JSONB — for fast key-value lookups.
• Full-text documents (tsvector), enabling efficient full-text search.
• HSTORE — for indexing key-value pairs.

Example of creating a GIN index for a JSONB field:

CREATE INDEX idx_gin_jsonb ON my_table USING GIN (my_jsonb_column);

Thus, GIN indexes are suitable for structured and semi-structured data where quick search by elements of collections or keys is important.