SET timestamp=UNIX_TIMESTAMP('2014-09-30 08:00:00');

CREATE FUNCTION f1(str char(20))
RETURNS CHAR(100)
RETURN CONCAT('Hello, ', str, '!');
SELECT * FROM mysql.proc WHERE name like 'f1';
SELECT f1('world');

--error ER_SP_ALREADY_EXISTS
CREATE FUNCTION f1(str char(20))
RETURNS TEXT
RETURN CONCAT('Hello2, ', str, '!');
SELECT body FROM mysql.proc WHERE name like 'f1';

CREATE FUNCTION IF NOT EXISTS f1(str char(20))
RETURNS CHAR(100)
RETURN CONCAT('Hello3, ', str, '!');
SELECT body FROM mysql.proc WHERE name like 'f1';

--error ER_WRONG_USAGE
CREATE OR REPLACE FUNCTION IF NOT EXISTS f1(str char(20))
RETURNS CHAR(100)
RETURN CONCAT('Hello4, ', str, '!');
SELECT body FROM mysql.proc WHERE name like 'f1';

CREATE OR REPLACE FUNCTION f1(str char(20))
RETURNS CHAR(100)
RETURN CONCAT('Hello5, ', str, '!');
SELECT body FROM mysql.proc WHERE name like 'f1';

DROP FUNCTION f1;
CREATE FUNCTION IF NOT EXISTS f1(str char(20))
RETURNS CHAR(100)
RETURN CONCAT('Hello6, ', str, '!');
SELECT body FROM mysql.proc WHERE name like 'f1';
SELECT f1('world');

DROP FUNCTION IF EXISTS f1;
SELECT body FROM mysql.proc WHERE name like 'f1';
DROP FUNCTION IF EXISTS f1;