Managing ClickHouseMore...System Tablescurrent_rolescurrent_rolesContains active roles of a current user. SET ROLE changes the contents of this table.Columns:role_name (String)) — Role name.with_admin_option (UInt8) — Flag that shows whether current_role is a role with ADMIN OPTION privilege.is_default (UInt8) — Flag that shows whether current_role is a default role.