mysql> select column_name from information_schema.columns where table_name='mysql.user';
+-----------------------+
| column_name           |
+-----------------------+
| Host                  |
| User                  |
| Password              |
| Select_priv           |
| Insert_priv           |
| Update_priv           |
| Delete_priv           |
| Create_priv           |
| Drop_priv             |
| Reload_priv           |
| Shutdown_priv         |
| Process_priv          |
| File_priv             |
| Grant_priv            |
| References_priv       |
| Index_priv            |
| Alter_priv            |
| Show_db_priv          |
| Super_priv            |
| Create_tmp_table_priv |
| Lock_tables_priv      |
| Execute_priv          |
| Repl_slave_priv       |
| Repl_client_priv      |
| Create_view_priv      |
| Show_view_priv        |
| Create_routine_priv   |
| Alter_routine_priv    |
| Create_user_priv      |
| ssl_type              |
| ssl_cipher            |
| x509_issuer           |
| x509_subject          |
| max_questions         |
| max_updates           |
| max_connections       |
| max_user_connections  |
+-----------------------+
37 rows in set