cost_hashjoin

From: Simon Riggs <simon(at)2ndQuadrant(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Subject: cost_hashjoin
Date: 2010-08-30 09:18:54
Message-ID: 1283159934.1800.1845.camel@ebony
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cost_hashjoin() has some treatment of what occurs when numbatches > 1
but that additional cost is not proportional to numbatches.

The associated comment talks about "an extra time", making it sound like
we think numbatches would only ever be 2 (or 1).

Can someone explain the current code, or is there an oversight there?

--
Simon Riggs www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Training and Services

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