CREATE OR REPLACE FUNCTION schema.abort_adding_column()
RETURNS event_trigger
LANGUAGE plpgsql
AS $$

DECLARE
obj record;

BEGIN
For obj IN SELECT * FROM information_schema.tables AND table_schema IN ('schema1') AND table_catalog = 'database1';
LOOP
RAISE EXCEPTION 'command % is not allowed on %s, see blah blah for more details.', tg_tag;
END LOOP;
END;
$$;