-- Adjust this setting to control where the objects get created.
SET search_path = public;

-- Internal function for the aggregate
-- Is called for each item in an aggregation
CREATE OR REPLACE FUNCTION int_agg_state (int4, int4)
RETURNS int4
AS 'MODULE_PATHNAME','int_agg_state'
LANGUAGE 'C' IMMUTABLE STRICT;

-- Internal function for the aggregate
-- Is called at the end of the aggregation, and returns an array.
CREATE OR REPLACE FUNCTION int_agg_final_array (int4)
RETURNS int4[]
AS 'MODULE_PATHNAME','int_agg_final_array'
LANGUAGE 'C' IMMUTABLE STRICT;

-- The aggregate function itself
-- uses the above functions to create an array of integers from an aggregation.
CREATE AGGREGATE int_array_aggregate (
	BASETYPE = int4,
	SFUNC = int_agg_state,
	STYPE = int4,
	FINALFUNC = int_agg_final_array,
	INITCOND = 0
);

-- The enumeration function
-- returns each element in a one dimentional integer array
-- as a row.
CREATE OR REPLACE FUNCTION int_array_enum(int4[])
RETURNS setof integer
AS 'MODULE_PATHNAME','int_enum'
LANGUAGE 'C' IMMUTABLE STRICT;
