| From: | Joshua Tolley <eggyknap(at)gmail(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, "Lawrence, Ramon" <ramon(dot)lawrence(at)ubc(dot)ca>, Bryce Cutt <pandasuit(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Proposed Patch to Improve Performance of Multi-BatchHash Join for Skewed Data Sets |
| Date: | 2009-02-26 14:57:25 |
| Message-ID: | 20090226145724.GE6811@eddie |
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| Lists: | pgsql-hackers |
On Thu, Feb 26, 2009 at 08:22:52AM -0500, Robert Haas wrote:
> On Thu, Feb 26, 2009 at 4:22 AM, Heikki Linnakangas
> <heikki(dot)linnakangas(at)enterprisedb(dot)com> wrote:
> > Joshua, in the tests that you've been running, did you have to rig the
> > planner with "enable_mergjoin=off" or similar, to get the queries to use
> > hash joins?
>
> I didn't have to fiddle anything, but Josh's tests were more exhaustive.
The planner chose hash joins for the queries I was running, regardless
of whether the patch was applied. I didn't have to mess with any
settings to get hash joins.
- Josh
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