Hello Developers,
Hi this is sachin.Actually i was currently experimenting with with
blob uniques in innodb
there is three main problems
1.Unique blob
2.Blob Forigen key
3.Blob primary key

1. For blob unique we can simply store hash in unclustered index
2. Blob Forigen key i am currently working on it
3. Blob primary key :- for this i thought we create a 4 byte column
which stores the hash of blob primary key.Internally this column will work as
primary key and key for clustered index. I already successufully tested this
here is my output

MariaDB [sachin]> create table t4 (abc blob primary key);
Query OK, 0 rows affected (0.10 sec)

MariaDB [sachin]> insert into t4 values('sachin');
Query OK, 1 row affected (0.01 sec)

MariaDB [sachin]> insert into t4 values('sachin');
ERROR 1062 (23000): Duplicate entry 'sachin' for key 'PRIMARY'
MariaDB [sachin]> insert into t4 values('sachin setiya');
Query OK, 1 row affected (0.00 sec)

MariaDB [sachin]> insert into t4 values('sachin setiya');
ERROR 1062 (23000): Duplicate entry 'sachin setiya' for key 'PRIMARY'

MariaDB [sachin]> desc t4;
+-------+------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+------+------+-----+---------+-------+
| abc   | blob | NO   | PRI | NULL    |       |
+-------+------+------+-----+---------+-------+
1 row in set (0.01 sec)

MariaDB [sachin]> select * from t4;
+---------------+
| abc           |
+---------------+
| sachin        |
| sachin setiya |
+---------------+
2 rows in set (0.01 sec)

@Sergei hi! Actually i invested arround 2 months in mariadb So for me now it  does not matter either i got selected in gsoc i want to do work in innodb blob unique from today.Please sir allow me to do this

I am including the patch file and t4.ibd and t4.frm file
Regards
sachin