Re: pg_upgrade and extra_float_digits

Bruce Momjian <bruce@momjian.us> writes:
> Andrew Dunstan wrote:
>> But do earlier server versions accept a value of 3? The 8.4 docs say 
>> "The value can be set as high as 2".

> That is the other thing I had to hack --- the 8.4 backend version had to
> be changed to accept '3'.  The good thing is this has to be done only
> once --- once I have the dump file, I can use it in testing repeatedly
> because 8.4 does not change.

> Eventually the idea would be to have the build farm run such tests (with
> a properly created dump file) so we can learn quickly if the backend
> data format is changed.

If we're thinking of doing that, it would be better to back-patch the
change that allowed '3'.
        regards, tom lane