Tom Lane wrote:
Andrew Dunstan <> writes:
Bruce Momjian wrote:
FYI, I test pg_upgrade by loading the old cluster's regression database
from a pg_dump output file, then after the upgrade, I dump the
regression database of the new cluster and diff the changes.

The problem I just encountered is that pg_dump uses
extra_float_digits=-3 for 9.0, while previous releases used '2'.  I had
to do hack each server version to get a dump output that would match
without rounding errors --- it did eventually work and validated.

That sounds like a disaster waiting to happen. The server version is going to affect much more than just this behaviour, surely. Wouldn't it be better to provide a pg_dump option to provide the extra_float_digits setting?

What disaster?  That's only for test purposes, it has nothing to do with
actual data transfer.


Maybe I have misunderstood. How exactly is the server version being hacked here? I know it's only for testing, but it still seems to me that lying to a program as heavily version dependant as pg_dump is in general a bad idea.



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