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Showing content from https://mariadb.com/docs/server/reference/sql-statements/data-definition/alter/alter-function below:

ALTER FUNCTION | MariaDB Documentation

1. Reference
2. SQL Statements
3. Data Definition (DDL)
4. ALTER

ALTER FUNCTION func_name [characteristic ...]

characteristic:
    { CONTAINS SQL | NO SQL | READS SQL DATA | MODIFIES SQL DATA }
  | SQL SECURITY { DEFINER | INVOKER }
  | COMMENT 'string'

This statement can be used to change the characteristics of a stored function. More than one change may be specified in an ALTER FUNCTION statement. However, you cannot change the parameters or body of a stored function using this statement; to make such changes, you must drop and re-create the function using DROP FUNCTION and CREATE FUNCTION.

You must have the ALTER ROUTINE privilege for the function. (That privilege is granted automatically to the function creator.) If binary logging is enabled, the ALTER FUNCTION statement might also require the SUPER privilege, as described in Binary Logging of Stored Routines.

ALTER FUNCTION hello SQL SECURITY INVOKER;

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