Re: Function call order dependency

> pgsql(at)mohawksoft(dot)com writes:
>> For example I'll use the Oracle "contains" function, though this is not
>> exactly what I'm doing, it just illustrates the issue clearly.
>
>> select *, score(1) from mytable where contains(mytable.title, 'Winding
>> Road', 1) order by score(1);
>
>> The "contains" function does a match against mytable.title for the term
>> 'Winding Road' and both returns and saves an integer score which may be
>> retrieved later using the "score(...)" function.
>
> This is just a bad, bad idea. Side-effects in a WHERE-clause function
> are guaranteed to cause headaches. When (not if) it breaks, you get
> to keep both pieces.

I was kind of afraid of that. So, how could one implement such a function
set?