MySQL 8.0 Release Notes
MySQL 8.0 Source Code Documentation
Pre-General Availability Draft: 2017-07-17
This section describes user-defined functions (UDFs) that are specific to individual keyring plugins. Currently, no keyring plugin in MySQL 8.0 has plugin-specific UDFs. For information about general-purpose keyring UDFs, see Section 6.5.4.4, “General-Purpose Keyring Key-Management Functions”.