Horton

Re: pg_upgrade bug found!

Jeff Davis <pgsql@j-davis.com>

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From: Jeff Davis <pgsql@j-davis.com>
To: Bruce Momjian <bruce@momjian.us>
Cc: RhodiumToad on IRC <andrew@tao11.riddles.org.uk>, Robert Haas <robertmhaas@gmail.com>, Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>, Alvaro Herrera <alvherre@commandprompt.com>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2011-04-07T21:26:05Z
Lists: pgsql-hackers 
On Thu, 2011-04-07 at 17:06 -0400, Bruce Momjian wrote:
> I want to avoid anything that requires a compile because they are hard
> for many sites to install so TransactionIdPrecedes() is out.  We will
> need to do this in PL/pgSQL probably.

PL/pgSQL can't see dead rows, so that would not be correct. It's
guaranteed to be the same value you see from the heap or newer; because
if it's not visible in the heap, it's not going to be visible in the
toast table.

Regards,
	Jeff Davis