Re: Removing faulty hyperLogLog merge function

On 04/26/2016 07:23 PM, Robert Haas wrote:
> On Tue, Apr 26, 2016 at 9:35 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>>> I'm not prepared to commit this over the objection offered by Tomas
>>> Vondra on that thread.
>>
>> FWIW, I agree with Peter that we should remove this code. We know that it
>> is buggy. Leaving it there constitutes an "attractive nuisance" --- that
>> is, I'm afraid that someone will submit a patch that depends on that
>> function, and that we might forget that the function is broken and commit
>> said patch.
>>
>> Tomas' objection would be reasonable if a fix was simple, but so far as
>> I can tell from the thread, it's not. In particular, Peter doesn't trust
>> the upstream patch in question. But whether or not you trust it, doing
>> nothing is not a sane choice. The reasonable alternatives are to remove
>> the merge function or sync the upstream patch.
>
> Now I agree with that. And now we do not have a 1-1 tie on which
> alternative to prefer, which is a good start towards a consensus. Any
> other views?

I haven't followed this issue all that closely, but to me it seems
pretty clear. If the function is brand new to 9.6, buggy, and not even
used anywhere, I cannot imagine why we would leave it in the tree.

Joe

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