Re: Exclusion constraint issue

On Fri, Sep 24, 2010 at 05:22:15PM -0400, Tom Lane wrote:
> Eric McKeeth <eldin00(at)gmail(dot)com> writes:
> > why would I get the following error, since the period() function
> > is in fact declared as immutable?
>
> > test=# ALTER TABLE test3 ADD exclude using
> > gist(period(effect_date::timestamptz, expire_date::timestamptz)
> > with && ); ERROR: functions in index expression must be marked
> > IMMUTABLE
>
> period() might be immutable, but those casts from date to
> timestamptz are not, because they depend on the TimeZone parameter.

How hard would it be to point out the first expression found to be
mutable? All of them?

Cheers,
David.
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