Re: Exclusion constraints with time expressions

On 2012-11-06, Albe Laurenz <laurenz.albe@wien.gv.at> wrote:
> hari.fuchs@gmail.com wrote:
>> > I think the problem is that this + operator is implemented
>> > by the function "timestamptz_pl_interval", which is STABLE
>> > but not IMMUTABLE.
>> >
>> > I am not sure why this function cannot be IMMUTABLE, it
>> > seems to me that it should be.
>>
>> No: the result of e.g.
>>
>>   SELECT TIMESTAMPTZ '2012-10-28 01:30:00' + INTERVAL '24 hours';
>>
>> depends on the client's timezone and its DST rules.
>
> You are right; timestamptz_in itself is STABLE, and I forgot
> about daylight savings time.

The original poster had a timestamptz constant (using the naval
timezone 'Z') yet he still had the problem.,

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