From: | Atri Sharma <atri(dot)jiit(at)gmail(dot)com> |
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To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
Cc: | PgHacker <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Randomisation for ensuring nlogn complexity in quicksort |
Date: | 2013-07-02 12:04:37 |
Message-ID: | CAOeZVidTsYUL57Mjp0iPaXZ=5OOoeGfr4Sx_pAk805yixz+TjQ@mail.gmail.com |
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Lists: | pgsql-hackers |
On Tue, Jul 2, 2013 at 5:20 PM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> On Tue, Jul 2, 2013 at 12:33 AM, Atri Sharma <atri(dot)jiit(at)gmail(dot)com> wrote:
>>> If you want to get a useful response to your emails, consider
>>> including a statement of what you think the problem is and why you
>>> think your proposed changes will help. Consider offering a test case
>>> that performs badly and an analysis of the reason why.
>>
>> Right, thanks for that. I will keep that in mind.
>>
>> I was thinking about *mostly sorted* datasets, consider the following:
>>
>> 10 11 12 4 5 6 1 2
>
> I think if you'll try it you'll find that we perform quite well on
> data sets of this kind - and if you read the code you'll see why.
Right, let me read the code again from that viewpoint.
Thanks a ton for your help!
Regards,
Atri
--
Regards,
Atri
l'apprenant
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