| From: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | pgsql-hackers(at)postgreSQL(dot)org |
| Subject: | Re: Improving planning of outer joins |
| Date: | 2005-12-16 19:41:53 |
| Message-ID: | 1134762113.2964.53.camel@localhost.localdomain |
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| Lists: | pgsql-hackers |
On Wed, 2005-12-14 at 21:27 -0500, Tom Lane wrote:
> I've spent some time looking into how we can improve our planning of outer
> joins.
Sounds good.
> I'm not sure whether we'd need any additional planner knobs to control
> this. I think that the existing join_collapse_limit GUC variable should
> continue to exist, but its effect on left/right joins will be the same as
> for inner joins. If anyone wants to force join order for outer joins more
> than for inner joins, we'd need some other control setting, but I don't
> currently see why that would be very useful.
Agreed. No additional GUCs required.
> Does this seem like a reasonable agenda
Yup - tis good.
Best Regards, Simon Riggs
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