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Re: Improving planning of outer joins

From: Christopher Kings-Lynne <chriskl(at)familyhealth(dot)com(dot)au>
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 02:19:20
Message-ID: 43A22428.6090208@familyhealth.com.au (view raw or flat)
Thread:
Lists: pgsql-hackers
> 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.
> 
> Does this seem like a reasonable agenda, or am I thinking too small?
> 
> 			regards, tom lane
> 
> ---------------------------(end of broadcast)---------------------------
> TIP 6: explain analyze is your friend



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