-- complain if script is sourced in psql, rather than via CREATE EXTENSION
\echo Use "ALTER EXTENSION vector UPDATE TO '0.6.3'" to load this file. \quit

CREATE FUNCTION hamming_distance(bit, bit) RETURNS float8
	AS 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;

CREATE OPERATOR <~> (
	LEFTARG = bit, RIGHTARG = bit, PROCEDURE = hamming_distance,
	COMMUTATOR = '<~>'
);

CREATE OPERATOR CLASS bit_hamming_ops
	FOR TYPE bit USING hnsw AS
	OPERATOR 1 <~> (bit, bit) FOR ORDER BY float_ops,
	FUNCTION 1 hamming_distance(bit, bit);