| From: | David Fetter <david(at)fetter(dot)org> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Itagaki Takahiro <itagaki(dot)takahiro(at)gmail(dot)com>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: MULTISET and additional functions for ARRAY |
| Date: | 2010-11-15 19:14:37 |
| Message-ID: | 20101115191437.GB22943@fetter.org |
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| Lists: | pgsql-hackers |
On Mon, Nov 15, 2010 at 10:13:40AM -0500, Tom Lane wrote:
> Itagaki Takahiro <itagaki(dot)takahiro(at)gmail(dot)com> writes:
> > Another issue for sorting is that we have 4 kinds of sorting: ASC/DESC
> > and NULLS FIRST/LAST.
>
> We have a lot more kinds than that. See USING.
USING pretty much gives us no chance of optimizing at all. Could we
maybe see about optimizing the 99% case, which those two bits cover?
Cheers,
David.
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