On Tue, Apr 12, 2016 at 11:25:21AM -0700, Josh Berkus wrote:
> Here's the features I can imagine being worth major backwards
> compatibility breaks:
> 5. Transparent upgrade-in-place (i.e. allowing 10.2 to use 10.1's tables
> without pg_upgrade or other modification).

Technically, this is exactly what pg_upgrade does.  I think what you
really mean is for the backend binary to be able to read the system
tables and WAL files of the old clusters --- something I can't see us
implementing anytime soon.

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

+ As you are, so once was I. As I am, so you will be. +
+                     Ancient Roman grave inscription +

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