| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Miroslav Šulc <miroslav(dot)sulc(at)startnet(dot)cz> |
| Cc: | pgsql-performance(at)postgresql(dot)org, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: [PERFORM] How to read query plan |
| Date: | 2005-03-14 15:04:25 |
| Message-ID: | 13476.1110812665@sss.pgh.pa.us |
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| Lists: | pgsql-hackers pgsql-performance |
=?windows-1250?Q?Miroslav_=8Aulc?= <miroslav(dot)sulc(at)startnet(dot)cz> writes:
> Tom Lane wrote:
>> Actually, we already had a pending patch (from Atsushi Ogawa) that
>> eliminates that particular O(N^2) behavior in another way. After
>> applying it, I get about a factor-of-4 reduction in the runtime for
>> Miroslav's example.
>>
> Is there a chance we will see this patch in the 8.0.2 release?
No. We are not in the habit of making non-bug-fix changes in stable
branches. Ogawa's patch is in CVS for 8.1.
regards, tom lane
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