-- complain if script is sourced in psql, rather than via CREATE EXTENSION
\echo Use "ALTER EXTENSION vector UPDATE TO '0.5.0'" to load this file. \quit

CREATE FUNCTION l1_distance(vector, vector) RETURNS float8
	AS 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;

CREATE FUNCTION vector_mul(vector, vector) RETURNS vector
	AS 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;

CREATE OPERATOR * (
	LEFTARG = vector, RIGHTARG = vector, PROCEDURE = vector_mul,
	COMMUTATOR = *
);

CREATE FUNCTION vector_sum(double precision[]) RETURNS vector
	AS 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;

CREATE AGGREGATE sum(vector) (
	SFUNC = vector_accum,
	STYPE = double precision[],
	FINALFUNC = vector_sum,
	COMBINEFUNC = vector_combine,
	INITCOND = '{0}',
	PARALLEL = SAFE
);