Syntax
------ 
CURRENT_USER, CURRENT_USER()
 
Description
----------- 
Returns the user name and host name combination for the
MariaDB account
that the server used to authenticate the current client.
This account
determines your access privileges. The return value is a
string in the
utf8 character set.
 
The value of CURRENT_USER() can differ from the value of
USER(). CURRENT_ROLE() returns the current active role.
 
Examples
-------- 
shell> mysql --user="anonymous"
 
MariaDB [(none)]> select user(),current_user();
+---------------------+----------------+
| user() | current_user() |
+---------------------+----------------+
| anonymous@localhost | @localhost |
+---------------------+----------------+
 
When calling CURRENT_USER() in a stored procedure, it
returns the owner of the stored procedure, as defined with
DEFINER.
 


URL: https://mariadb.com/kb/en/current_user/