To: Guillaume Lelarge <guillaume@lelarge.info>
cc: Wells Oliver <wellsoliver@gmail.com>, pgsql-admin@postgresql.org
Subject: Re: Dump/restore casts 
In-reply-to: <4DD0E83D.2050805@lelarge.info> 
References: <BANLkTi=zbWZkJf8HZEGHnF-pVkKHyBmv+g@mail.gmail.com>
	<4DD0E83D.2050805@lelarge.info>
Comments: In-reply-to Guillaume Lelarge <guillaume@lelarge.info>
	message dated "Mon, 16 May 2011 11:02:53 +0200"
Date: Mon, 16 May 2011 10:33:09 -0400
Message-ID: <15453.1305556389@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>

Guillaume Lelarge <guillaume@lelarge.info> writes:
> Le 05/12/2011 03:52 AM, Wells Oliver a écrit :
>> If I'm understanding things, pg_dump will not dump casts b/c they are system
>> objects and belong to neither schema nor database.

> It doesn't dump system casts because they are system objects, and so
> always available. But it does dump user casts.

Of course the trick is to tell which is which.  According to the pg_dump
code the current rule is

     * As per discussion we dump casts if one or more of the underlying
     * objects (the conversion function and the two data types) are not
     * builtin AND if all of the non-builtin objects are included in the dump.
     * Builtin meaning, the namespace name does not start with "pg_".

Possibly Oliver is falling foul of that rule somehow --- it's certainly
not perfect, especially in a partial dump scenario.

			regards, tom lane