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From: Tom Lane <tgl@sss.pgh.pa.us>
To: cluster <skrald@amossen.dk>
Cc: pgsql-performance@postgresql.org
Subject: Re: FK triggers misused?
Date: Mon, 16 Apr 2007 19:55:06 -0400
Message-ID: <12251.1176767706@sss.pgh.pa.us> (raw)
In-Reply-To: <f00vq0$2ncr$1@news.hub.org>
References: <evqm6g$29b1$1@news.hub.org>
	<26399.1176614941@sss.pgh.pa.us>
	<slrnf23eqp.10cj.andrew+nonews@atlantis.supernews.net>
	<102.1176650563@sss.pgh.pa.us>
	<slrnf258g3.10cj.andrew+nonews@atlantis.supernews.net>
	<f00vq0$2ncr$1@news.hub.org>

Idly thumbing through the code, I came across something that might
possibly explain your results.  Do the rows being updated contain
NULLs in the foreign-key columns?  I see that ri_KeysEqual() treats
two null values as not equal, which might be overzealous respect for
SQL null semantics in this context.

			regards, tom lane

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