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
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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

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