Re: Proposed patch to make mergejoin cost estimation more symmetric

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Simon Riggs <simon(at)2ndquadrant(dot)com>
Cc: pgsql-patches(at)postgreSQL(dot)org
Subject: Re: Proposed patch to make mergejoin cost estimation more symmetric
Date: 2007-12-07 14:48:42
Message-ID: 19574.1197038922@sss.pgh.pa.us
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Simon Riggs <simon(at)2ndquadrant(dot)com> writes:
> I do have a longer term issue that there is no information provided by
> EXPLAIN to allow us to differentiate these two conditions.

Sure there is: the new startup condition affects the estimated plan
startup cost (only) and the existing termination condition affects the
estimated total cost (only).

regards, tom lane

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