WL#1679: Produce warning for conflicting options to CREATE/ALTER

Affects: Server-7.1   —   Status: Un-Assigned   —   Priority: Very High

mysql> create table t1 (a char) engine=heap engine=myisam;
Query OK, 0 rows affected (0.07 sec)

The above statement is an example of conflicting options.
We should produce either warning or error. Monty prefers warning.


Related statements:

CREATE DATABASE
CREATE TABLE
CREATE INDEX
CREATE FUNCTION
CREATE PROCEDURE
and others, including ALTERs for all the above cases.