maria-developers team mailing list archive

[Oleksandr Byelkin <sanja@xxxxxxxxxxxxxxxx>]

Hi, Christian!

On 06.03.2016 12:23, Christian Massey wrote:
> Hi everyone,
>
> I am Christian Massey a computer science student at York University 
> and I wish to work on Providing import and export functions for 
> popular data formats like JSON, XML , PHP, ... for Connector/C and 
> MariaDB Server. I have been inspecting the code to understand how the 
> dynamic column packed string is encoded and I see kind on big endian 
> encoding( Correct me if I am wrong please).
>
> Also I see that the old format already work like arrays and it uses 3 
> bits for encoding type which is the main reason why not all types  in 
> the enum are supported in this old format.
>
>  DBUG_ASSERT(((type - 1) & (~7)) == 0); /* fit in 3 bits */
>
> (Again please correct me if I am wrong. The encoding is not easy to 
> understand)

You are right.

> My Question is do we need to create a completely new type to support 
> arrays or do we change the old format which already work like arrays 
> in a way but lacks support for some types(I don't know which of the 
> enums yet).

How it is done internally not so important. But "externally" it should 
be new type because:
1) we should read old types
2) we can't use old "as is" because it lack types

But "internally" code can be of course reused.

> Please, I wish to write a proposal for this project and hope to 
> discuss more with mentors for more clarification on how we are going 
> to implement this as it seems to be a very important if not the most 
> critical part of this project.
>
>
> Cheers,
> Kris.
>
>
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