| From: | Marti Raudsepp <marti(at)juffo(dot)org> |
|---|---|
| To: | Alexander Korotkov <aekorotkov(at)gmail(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Andreas Karlsson <andreas(at)proxel(dot)se>, David Rowley <dgrowleyml(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Andres Freund <andres(at)2ndquadrant(dot)com>, Martijn van Oosterhout <kleptog(at)svana(dot)org> |
| Subject: | Re: PoC: Partial sort |
| Date: | 2014-02-10 10:33:27 |
| Message-ID: | CABRT9RD77U1N+EkcXEp7K0njhg7fr9RAWB-KXA9nkwNv6sXMEQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Sun, Feb 9, 2014 at 7:37 PM, Alexander Korotkov <aekorotkov(at)gmail(dot)com> wrote:
> This is not only place that worry me about planning overhead. See
> get_cheapest_fractional_path_for_pathkeys. I had to estimate number of
> groups for each sorting column in order to get right fractional path.
AFAICT this only happens once per plan and the overhead is O(n) to the
number of pathkeys? I can't get worried about that, but I guess it's
better to test anyway.
PS: You didn't answer my questions about splitting the patch. I guess
I'll have to do that anyway to run the tests.
Regards,
Marti
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