[google-cloud-sql-discuss] I want to update MYSQL Variable on Google cloud server

here is my error 

[Err] 1418 - This function has none of DETERMINISTIC, NO SQL, or READS SQL DATA in its declaration and binary logging is enabled (you *might* want to use the less safe log_bin_trust_function_creators variable)

and here is my code

DROP FUNCTION IF EXISTS `SPLIT_STR`;

DELIMITER ;;

CREATE FUNCTION `SPLIT_STR`(x longtext,

  delim VARCHAR(12),

  pos INT) RETURNS varchar(255) CHARSET utf8

RETURN REPLACE(SUBSTRING(SUBSTRING_INDEX(x, delim, pos),

       LENGTH(SUBSTRING_INDEX(x, delim, pos -1)) + 1),

       delim, '')

;;

DELIMITER ;

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