Re: Proposed Patch to Improve Performance of Multi-BatchHash Join for Skewed Data Sets

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.linnakangas@enterprisedb.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