Syntax
------

NAME_CONST(name,value)

Description
-----------

Returns the given value. When used to produce a result set column,
NAME_CONST() causes the column to have the given name. The arguments should be
constants.

This function is used internally when replicating stored procedures. It makes
little sense to use it explicitly in SQL statements, and it was not supposed
to be used like that.

SELECT NAME_CONST('myname', 14);
+--------+
| myname |
+--------+
|     14 |
+--------+

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