| From: | Peter Geoghegan <peter(at)2ndquadrant(dot)com> |
|---|---|
| To: | Bruce Momjian <bruce(at)momjian(dot)us> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Noah Misch <noah(at)leadboat(dot)com>, Jay Levitt <jay(dot)levitt(at)gmail(dot)com>, "Jim Decibel! Nasby" <decibel(at)decibel(dot)org>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PG Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Progress on fast path sorting, btree index creation time |
| Date: | 2012-02-09 17:29:00 |
| Message-ID: | CAEYLb_UCYjNL3kPG+2p3JHA86rwf=vaZOBz6F+eBmReWSHBS0A@mail.gmail.com |
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| Lists: | pgsql-hackers |
On 9 February 2012 17:16, Bruce Momjian <bruce(at)momjian(dot)us> wrote:
>> Yes, I am. The main reason that the loops exist in those functions
>> (which is the only way that they substantially differ) is because they
>> each have to get the other keys through various ways that characterise
>> the tuple class that they encapsulate (index_getattr(),
>> heap_getattr(), etc).
>
> Does this help all types for sorting, including strings?
Yes, it does, though of course that's not expected to make too much
difference with text when the C locale isn't used, because the
comparisons are inherently much more expensive, and there isn't a
whole lot we can do about that, at least here.
--
Peter Geoghegan http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training and Services
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