Re: Compressed TOAST Slicing

On Fri, Nov 2, 2018 at 11:55 PM Paul Ramsey <pramsey(at)cleverelephant(dot)ca> wrote:
>
> As threatened, I have also added a patch to left() to also use sliced access.

Hi Paul,

The idea looks good and believing your performance evaluation it seems
like a practical one too.

I had a look at this patch and here are my initial comments,
1.
- if (dp != destend || sp != srcend)
+ if (!is_slice && (dp != destend || sp != srcend))
return -1;

A comment explaining how this check differs for is_slice case would be helpful.
2.
- int len = VARSIZE_ANY_EXHDR(str);
- int n = PG_GETARG_INT32(1);
- int rlen;
+ int n = PG_GETARG_INT32(1);

Looks like PG indentation is not followed here for n.

--
Regards,
Rafia Sabih
EnterpriseDB: http://www.enterprisedb.com/