Re: [PATCHES] updated hash functions for postgresql v1

Jeff Davis <[email protected]> Fri, 09 Jan 2009 14:00:39 -0800

Newsgroups	gmane.comp.db.postgresql.devel.general,gmane.comp.db.postgresql.devel.patches
Message-ID	<[email protected]>

On Fri, 2009-01-09 at 14:29 -0600, Kenneth Marshall wrote:
> Jeff,
> 
> Thanks for the review. I would not really expect any differences in hash
> index build times other than normal noise variances. The most definitive
> benchmark that I have seen was done with my original patch submission
> in March posted by Luke of Greenplum:
> 
>   "We just applied this and saw a 5 percent speedup on a hash aggregation
>    query with four columns in a 'group by' clause run against a single
>    TPC-H table."
> 
> I wonder if they would be willing to re-run their test? Thanks again.

Separating mix() and final() should have some performance benefit,
right?

Regards,
	Jeff Davis


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