Andres Freund <[email protected]> writes:
> On 2013-08-29 15:55:13 -0400, Tom Lane wrote:
>> For context see the thread starting here:
>> http://www.postgresql.org/message-id/[email protected]
>> In that thread we agreed that this "policy" might be rather squishy,
>> but we should at least think hard about whether it would be wise to create
>> built-in aggregates with the same name and different numbers of arguments.
> I vote for abolishing that policy or maybe weakinging it. As you comment
> somewhere downthread the policy just prohibits core functions, but even
> for those it looks too strong for me. There are some useful variadic
> aggregates I'd like to see and I don't think that the kind of errors
> prevented by the policy are frequent enough to warrant a blanket
> prohibition.
Well, I dunno. We had two different "bug reports" caused by this type of
confusion before string_agg even got out of beta, both from intelligent
people. So I'm not about to discount the potential for confusion.
As we said originally, this is a policy that might be broken for
sufficiently strong cause --- but I don't want to just forget about
the risks.
> I'd say we let the check in there but have a list of exceptions in it so
> that one has to explicitly think about the issue before adding the
> function.
That's pretty much how the tests in opr_sanity work now.
regards, tom lane
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