On 22 June 2010 10:46, Thom Brown <thombrown@gmail.com> wrote:
> On 22 June 2010 09:59, Satoshi Nagayasu <satoshi.nagayasu@gmail.com> wrote:
>> Magnus,
>>
>> Thanks for your advice. I've understood how it happens.
>>
>> However, it looks tricky and difficult to understand,
>> so I hope that the message could be more understandable
>> as Thom mentioned.
>>
>> Regards,
>>
>
> This does appear to be a gotcha, as the following returns a negative
> integer as expected:
>
> postgres=# SELECT -2147483648;
> ?column?
> -------------
> -2147483648
> (1 row)
>
> postgres=# SELECT pg_typeof(-2147483648);
> pg_typeof
> -----------
> integer
> (1 row)
>
> And just in case...
>
> postgres=# SELECT pg_typeof(test.my_num) FROM (SELECT -2147483648) AS
> test(my_num);
> pg_typeof
> -----------
> integer
> (1 row)
>
> So it's affected by the cast operator?
>
> Thom
>
Actually, come to think of it, shouldn't we have a gotchas page on the wiki?
Thom
