Re: pg_upgrade and extra_float_digits

Andrew Dunstan wrote:
> >> 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'.
> >
> >             
> >   
> 
> Yeah.
> 
> It's going to require some fancy dancing to get the buildfarm to do it. 
> Each buildfarm run is for a specific branch, and all the built artefacts 
> are normally thrown away. I'd have to work out a way of stashing the 
> binaries from a build on one branch for use in the pg_upgrade tests in 
> the run on another branch. It's doable but could get messy.

Uh, that is not actually a problem.  You just need to set
extra_float_digits=-3 to create the dump file, which is only done once
for each major version.  You can _load_ that dump file into an
unmodified old cluster and test just fine.  I will write up some
instructions in the next few days.

--  Bruce Momjian  <bruce@momjian.us>        http://momjian.us EnterpriseDB
http://enterprisedb.com