| From: | Bruce Momjian <bruce(at)momjian(dot)us> |
|---|---|
| To: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> |
| Cc: | PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Document aggregate functions better w.r.t. ORDER BY |
| Date: | 2023-10-25 23:22:29 |
| Message-ID: | ZTmjNdH23NWO9A6g@momjian.us |
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| Thread: | |
| Lists: | pgsql-hackers |
On Wed, Oct 25, 2023 at 04:14:11PM -0700, David G. Johnston wrote:
> Yeah, we punt on the entire concept in the data type section:
>
> "Managing these errors and how they propagate through calculations is the
> subject of an entire branch of mathematics and computer science and will not be
> discussed here," ...
>
> Also, I'm now led to believe that the relevant IEEE 754 floating point addition
> is indeed commutative. Given that, I am inclined to simply not add the order
> by clause at all to those four functions. (actually, you already got rid of the
> avg()s but the sum()s are still present, so just those two).
Ah, yes, sum() removed. Updated patch attached.
--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EDB https://enterprisedb.com
Only you can decide what is important to you.
| Attachment | Content-Type | Size |
|---|---|---|
| agg_order.diff | text/x-diff | 5.4 KB |
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