Re: xlog location arithmetic

On 26-01-2012 06:19, Fujii Masao wrote:

Thanks for your review. Comments below.

> When I compiled the source with xlogdiff.patch, I got the following warnings.
>
> xlogfuncs.c:511:2: warning: format '%lX' expects argument of type
> 'long unsigned int *', but argument 3 has type 'uint64 *' [-Wformat]
>
What is your compiler? I'm using gcc 4.6.2. I refactored the patch so I'm now
using XLogRecPtr and %X.

> postgres=# SELECT pg_xlog_location_diff('0/2000074', '0/2000074');
> ERROR:  xrecoff "2000074" is out of valid range, 0..A4A534C
>
Ugh? I can't reproduce that. It seems to be related to long int used by the
prior version.

> Since pg_xlog_location_diff() can be executed during recovery,
> the above needs to be updated.
>
Fixed.

>> While the output was int8 I could use
>> pg_size_pretty but now I couldn't. I attached another patch that implements
>> pg_size_pretty(numeric).
>
I realized that it collides with the pg_size_pretty(int8) if we don't specify
a type. Hence, I decided to drop the pg_size_pretty(int8) in favor of
pg_size_pretty(numeric). It is slower than the former but it is not a
performance critical function.

> According to the above source code comment in pg_proc.h, ISTM
> pg_size_pretty() for numeric also needs to have its own DESCR().
>
Fixed.

> According to "man strcat", the dest string must have enough space for
> the result.
> "buf" has enough space?
>
Ops. Fixed.


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