5.7.2 Obtaining User-Defined Function Information

The Performance Schema user_defined_functions table contains information about the currently installed user-defined functions (UDFs):

SELECT * FROM performance_schema.user_defined_functions;

The mysql.func system table also lists installed UDFs, but only those installed using CREATE FUNCTION. The user_defined_functions table lists UDFs installed using CREATE FUNCTION as well as UDFs installed automatically by server components or plugins. This difference makes user_defined_functions preferable to mysql.func for checking which UDFs are installed. See Section 26.12.19.9, “The user_defined_functions Table”.