Andrew Dunstan <andrew@dunslane.net> writes:
> However, I don't think we can promise never to change the ondisk
> representation of data, nor the page layout. Sometimes an inplace
> upgrade just won't work, ISTM.
We have talked about batching on-disk changes so that they'd only occur
once every few release cycles. But until we have a pg_upgrade, there is
no reason to adopt such a policy.
regards, tom lane