BUG #5001: can not prepare for where $1 is null

From: "" <94487509(at)qq(dot)com>
To: pgsql-bugs(at)postgresql(dot)org
Subject: BUG #5001: can not prepare for where $1 is null
Date: 2009-08-21 08:41:18
Message-ID: 200908210841.n7L8fIQq083062@wwwmaster.postgresql.org
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The following bug has been logged online:

Bug reference: 5001
Logged by:
Email address: 94487509(at)qq(dot)com
PostgreSQL version: 8.3.3
Operating system: linux
Description: can not prepare for where $1 is null
Details:

why can not prepare like this? thanks!
prepare ssss as select * from test where $1 is null;
ERROR: could not determine data type of parameter $1

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