Dear Developers,

I was doing prototype for this project as Mr Sergei Golubchik suggested 

"This task is about creating MI_UNIQUEDEF "uniques" instead of MI_KEYDEF
"keys" for long unique constraints."

Here is my output 

MariaDB [sachin]> create table tbl(int_key int primary key , blob_key blob unique);
Query OK, 0 rows affected (0.03 sec)

MariaDB [sachin]> insert into tbl values(1,1);
Query OK, 1 row affected (0.01 sec)

MariaDB [sachin]> insert into tbl values(2,1);
ERROR 1062 (23000): Duplicate entry '1' for key 'blob_key'
MariaDB [sachin]> insert into tbl values(2,2);
Query OK, 1 row affected (0.00 sec)

MariaDB [sachin]> insert into tbl values(3,3);
Query OK, 1 row affected (0.00 sec)

MariaDB [sachin]> select * from tbl;

+---------+----------+

| int_key | blob_key |

+---------+----------+

|       1 | 1        |

|       2 | 2        |

|       3 | 3        |

+---------+----------+

3 rows in set (0.00 sec)

I am assuming that unique blob will have 0 zero key .

Should i mail you the source code.Please let me know

Regards 

sachin