Re: Variadic aggregates vs. project policy - Mailing list pgsql-hackers

On 08/29/2013 05:37 PM, Josh Berkus wrote:
> Tom,
>
>> On further reflection, what the "policy" was actually about was not that
>> we should forbid users from creating potentially-confusing aggregates
>> themselves, but only that we'd avoid having any *built in* aggregates with
>> this hazard.  So maybe I'm overthinking this, and the correct reading is
>> just that we should have a policy against built-in variadic aggregates.
> Yes.  I think we can assume that anyone smart enough to create a
> variadic aggregate is smart enough to put ORDER BY in the right place.
>
>

It's not the creator who is in danger, though, it's the user of the 
aggregate function, AIUI. So unless you're saying that anyone smart 
enough to use a variadic aggregate can be assumed to be smart enough to 
put ORDER BY in the right place, I don't think this argument holds.

cheers

andrew