Skip site navigation (1) Skip section navigation (2)

Re: Proposed patch to make mergejoin cost estimation more symmetric

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Gregory Stark <stark(at)enterprisedb(dot)com>
Cc: pgsql-patches(at)postgresql(dot)org
Subject: Re: Proposed patch to make mergejoin cost estimation more symmetric
Date: 2007-12-07 14:55:12
Message-ID: 19673.1197039312@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-patches
Gregory Stark <stark(at)enterprisedb(dot)com> writes:
> What about a merge join against an empty table? I suppose there would just be
> no statistics?

Yeah.  The defenses against silly results in mergejoinscansel should be
enough to prevent it from doing anything really insane.

			regards, tom lane

In response to

pgsql-patches by date

Next:From: Alvaro HerreraDate: 2007-12-07 14:57:49
Subject: Re: Proposed patch to make mergejoin cost estimationmore symmetric
Previous:From: Tom LaneDate: 2007-12-07 14:48:42
Subject: Re: Proposed patch to make mergejoin cost estimation more symmetric

Privacy Policy | About PostgreSQL
Copyright © 1996-2014 The PostgreSQL Global Development Group