Is there any defect when use null column in postgresql?

From: leopay <leopay(at)gmail(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: Is there any defect when use null column in postgresql?
Date: 2009-03-16 03:30:16
Message-ID: e9369e430903152030s6de5e4bbpf4a9d9e27e2edad@mail.gmail.com
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I wanna if there is any defact when use null column in postgresql,
e.g. performance issue

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