| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Vlad Marchenko" <marchenko(at)gmail(dot)com> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: 8.3RC2 vs 8.2.6 testing results |
| Date: | 2008-01-29 18:56:26 |
| Message-ID: | 23933.1201632986@sss.pgh.pa.us |
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| Lists: | pgsql-general |
"Vlad Marchenko" <marchenko(at)gmail(dot)com> writes:
> I'm curious if that new hash aggregation algorithm was put in 8.3 with the
> performance increase as a goal
Yes.
http://archives.postgresql.org/pgsql-hackers/2007-05/msg01179.php
http://archives.postgresql.org/pgsql-committers/2007-06/msg00007.php
(and nearby messages)
> or it was simply a required change to support
> some other new feature of 8.3? Right now the switch from 8.2 to 8.3 doesn't
> seems a favorable step for the type of application that we have...
You are condemning a demonstrably better algorithm on the basis of one
test case. If you poke around a bit harder you will find other cases
where it is faster than 8.2 because of having better distribution.
regards, tom lane
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