Contains active roles of a current user. `SET ROLE` changes the contents of this table.
Columns:
-`role_name` ([String](../../sql-reference/data-types/string.md))) — Role name.
-`with_admin_option` ([UInt8](../../sql-reference/data-types/int-uint.md#uint-ranges)) — Flag that shows whether `current_role` is a role with `ADMIN OPTION` privilege.
-`is_default` ([UInt8](../../sql-reference/data-types/int-uint.md#uint-ranges)) — Flag that shows whether `current_role` is a default role.
