The ADMINISTRABLE_ROLE_AUTHORIZATIONS
      table provides information about which roles applicable for the
      current user or role can be granted to other users or roles.
    
      The ADMINISTRABLE_ROLE_AUTHORIZATIONS
      table has these columns:
- USER- The user name part of the current user account. 
- HOST- The host name part of the current user account. 
- GRANTEE- The user name part of the account to which the role is granted. 
- GRANTEE_HOST- The host name part of the account to which the role is granted. 
- ROLE_NAME- The user name part of the granted role. 
- ROLE_HOST- The host name part of the granted role. 
- IS_GRANTABLE- YESor- NO, depending on whether the role is grantable to other accounts.
- IS_DEFAULT- YESor- NO, depending on whether the role is a default role.
- IS_MANDATORY- YESor- NO, depending on whether the role is mandatory.