CREATE FUNCTION "URX_PUBLIC"."_raster_constraint_info_coverage_tile"(rastschema name, rasttable name, rastcolumn name) 
 RETURNS boolean AS 
$BODY$
	SELECT
		TRUE
	FROM pg_class c, pg_namespace n, pg_attribute a, pg_constraint s
	WHERE n.nspname = $1
		AND c.relname = $2
		AND a.attname = $3
		AND a.attrelid = c.oid
		AND s.connamespace = n.oid
		AND s.conrelid = c.oid
		AND a.attnum = ANY (s.conkey)
		AND s.consrc LIKE '%st_iscoveragetile(%';
	$BODY$
 LANGUAGE 'sql' STABLESTRICT ;