Creating User-defined Functions
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User-defined functions allow MariaDB to be extended with a new function that works like a native (built-in) MariaDB function such as ABS() or CONCAT(). There are alternative ways to add a new function: writing a native function (which requires modifying and compiling the server source code), or writing a stored function.
Statements making use of user-defined functions are not safe for replication.
Functions are written in C or C++, and to make use of them, the operating system must support dynamic loading.
For an example, see sql/udf_example.cc in the source tree. For a collection of existing UDFs see http://www.mysqludf.org/.
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