The docs say "readonly — Restricts permissions for all types of queries except DDL queries"

But if I do:

SET readonly=2
SET allow_ddl=1
create table test_ddl (id String) engine = Merge('default', 'test_ddl' )

I get :

Code: 164. DB::Exception: Received from localhost:9000. DB::Exception: default: Cannot execute query in readonly mode. (READONLY)

what's the correct way to allow executing DDL queries in readonly mode? The docs say readonly should not restrict DDL queries.