MySQL 9.5 Reference Manual Including MySQL NDB Cluster 9.5
      The ENABLED_ROLES table provides
      information about the roles that are enabled within the current
      session.
    
      The ENABLED_ROLES table has these
      columns:
    
          ROLE_NAME
        
The user name part of the granted role.
          ROLE_HOST
        
The host name part of the granted role.
          IS_DEFAULT
        
          YES or NO, depending on
          whether the role is a default role.
        
          IS_MANDATORY
        
          YES or NO, depending on
          whether the role is mandatory.