Robert Haas <robertmhaas@gmail.com> writes:
> On Tue, Jan 27, 2015 at 9:50 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> That's certainly impossible for the system catalogs, which means you
>> have to be able to deal with relfilenode discrepancies for them, which
>> means that maintaining the same relfilenodes for user tables is of
>> dubious value.
> Why is that impossible for the system catalogs?
New versions aren't guaranteed to have the same system catalogs, let alone
the same relfilenodes for them.
regards, tom lane