is a special cost for external sort?

From: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
To: PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: is a special cost for external sort?
Date: 2013-07-18 16:14:41
Message-ID: CAFj8pRDNJwkJxHGNrFR_+kBB7DPt_MwgUfx8gwMRAkqwny=1BA@mail.gmail.com
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Hello

I found a slow query with large external sort. I expect, so external
sort should be penalized. Is it?

Regards

Pavel

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