CREATE FUNCTION "URX_PUBLIC"."_raster_constraint_info_regular_blocking"(rastschema name, rasttable name, rastcolumn name) 
 RETURNS boolean AS 
$BODY$
	DECLARE
		covtile boolean;
		spunique boolean;
	BEGIN
		-- check existance of constraints
		-- coverage tile constraint
		covtile := COALESCE( "URX_PUBLIC"._raster_constraint_info_coverage_tile($1, $2, $3), FALSE);

		-- spatially unique constraint
		spunique := COALESCE( "URX_PUBLIC"._raster_constraint_info_spatially_unique($1, $2, $3), FALSE);

		RETURN (covtile AND spunique);
	END;
	$BODY$
 LANGUAGE 'plpgsql' STABLESTRICT ;