maria-developers team mailing list archive

[Jan Lindström <jan.lindstrom@xxxxxxxxxxx>]

Hi,

Sachin, naturally you may continue, this is open source, please read
https://mariadb.com/kb/en/mariadb/community-contributing-to-the-mariadb-project/
 From InnoDB point of view there is issue if you add a new system generated
column to the row. Firstly, existing tables will not have that column and
secondly it will effect e.g maximum row size and external tools like backup.

R: Jan

On Mon, Apr 11, 2016 at 12:33 PM, Sachin Setia <sachinsetia1001@xxxxxxxxx>
wrote:

> 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
>
>
>
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