Re: Peter Eisentraut 2017-08-24 
> On 8/23/17 09:36, Robert Haas wrote:
> > I think I agree.  It seems to me that the version of pg_upgrade
> > shipped with release N only needs to support upgrades to release N,
> > not older releases.  There's probably room for debate about whether a
> > pg_upgrade needs to support direct upgrades FROM very old releases,
> > but we need not decide anything about that right now.
> > 
> > I think you could go ahead and rip out this code, but as it seems like
> > a non-critical change, -1 for back-patching it.
> committed to PG10 and master

This #define seems to be obsolete now as well:
src/bin/pg_upgrade/pg_upgrade.h:#define TABLE_SPACE_SUBDIRS_CAT_VER 201001111


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