PostgreSQL trigger: loop through the columns of the source table

gistfile1.sql

DECLARE
	_name text;
BEGIN
	FOR _name IN SELECT column_name FROM information_schema.Columns WHERE table_schema = TG_TABLE_SCHEMA AND table_name = TG_TABLE_NAME LOOP
		RAISE NOTICE 'Column is %', _name;
	END LOOP;
	RETURN NEW;
END