tests+docs

docs/en/sql-reference/functions/other-functions.md

@@ -405,7 +405,7 @@ Returns the name of the current user. In case of a distributed query, the name o
 SELECT currentUser();
 ```
 
-Alias: `user()`, `USER()`.
+Aliases: `user()`, `USER()`, `current_user()`. Aliases are case insensitive.
 
 **Returned values**
 

tests/queries/0_stateless/00990_function_current_user.reference

@@ -2,3 +2,7 @@
 1
 1	1
 1
+1
+1
+1	1	1
+1

tests/queries/0_stateless/00990_function_current_user.sql

@@ -3,3 +3,8 @@ select currentUser() IS NOT NULL;
 select length(currentUser()) > 0;
 select currentUser() = user(), currentUser() = USER();
 select currentUser() = initial_user from system.processes where query like '%$!@#%';
+
+select current_user() IS NOT NULL;
+select length(current_user()) > 0;
+select current_user() = user(), current_user() = USER(), current_user() = currentUser();
+select current_user() = initial_user from system.processes where query like '%$!@#%';