Per internal table ACL access rules. 
This class is an interface. Per table(s) specific access rule should be implemented in a subclass. 
- See also
 - ACL_internal_schema_access 
 
 
Check access to an internal table. 
When a privilege is granted, this method add the requested privilege to save_priv. 
- Parameters
 - 
  
     | want_access | the privileges requested  | 
    | [in,out] | save_priv | the privileges granted  | 
     | any_combination_will_do | true if it's enough to have any privilege for any combination of the table columns.  | 
  
   
- Return values
 - 
  
    | ACL_INTERNAL_ACCESS_GRANTED | All the requested privileges are granted, and saved in save_priv.  | 
    | ACL_INTERNAL_ACCESS_DENIED | At least one of the requested privileges was denied.  | 
    | ACL_INTERNAL_ACCESS_CHECK_GRANT | No requested privilege was denied, and grant should be checked for at least one privilege. Requested privileges that are granted, if any, are saved in save_priv.  | 
  
   
Implemented in PFS_readonly_acl, PFS_truncatable_acl, PFS_updatable_acl, PFS_editable_acl, PFS_unknown_acl, PFS_readonly_world_acl, PFS_truncatable_world_acl, and PFS_readonly_processlist_acl.