为什么我的 function 不能在 DB2 LUW 上使用相同的关键字？

Question

I have following function on IBM i DB2 and want to use it on DB2 LUW (Linux). The error I receive is "Multiple or conflicting keywords involving the "FENCED" clause are present.. SQLCODE=-628, SQLSTATE=42613". Why can I not use it? The documentation lists the keywords, so I do not understand...

CREATE OR REPLACE FUNCTION getHex2Char(IN_HEXCHAR VARCHAR(8))
RETURNS INT
DETERMINISTIC
RETURNS NULL ON NULL INPUT
NO EXTERNAL ACTION 
BEGIN
-- Do some SQL stuff and return result
END

Answer 1

The currently supported Db2-LUW versions allow the clause called on null input ( the syntax null call has the same meaning ) with the create function statement.

But the function can return a NULL or a NOT NULL value, when the input is null.

The Db2 for i implementation of returns null on null input is not currently in the Db2-LUW implementation.

Reference Db2-LUW documentation link .