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differnt behaviour of NULL in an aggregate and with an operator

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To: pgsql-general@xxxxxxxxxxxxxx
Subject: differnt behaviour of NULL in an aggregate and with an operator
From: "Willy-Bas Loos" <willybas@xxxxxxxxx>
Date: Tue, 12 Aug 2008 10:29:57 +0200

Hi,

Why is it that
SELECT 1+null
evaluates to NULL, but
SELECT sum(foo) FROM (VALUES(1), (NULL)) AS v(foo)
evaluates to 1 ?

WBL

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