Buildfarm has got the measles

A significant fraction of the buildfarm is showing this in HEAD:

***************
*** 375,382 ****
  create table rewritemetoo1 of rewritetype;
  create table rewritemetoo2 of rewritetype;
  alter type rewritetype alter attribute a type text cascade;
- NOTICE:  Table 'rewritemetoo1' is being rewritten (reason = 4)
  NOTICE:  Table 'rewritemetoo2' is being rewritten (reason = 4)
  -- but this doesn't work
  create table rewritemetoo3 (a rewritetype);
  alter type rewritetype alter attribute a type varchar cascade;
--- 375,382 ----
  create table rewritemetoo1 of rewritetype;
  create table rewritemetoo2 of rewritetype;
  alter type rewritetype alter attribute a type text cascade;
  NOTICE:  Table 'rewritemetoo2' is being rewritten (reason = 4)
+ NOTICE:  Table 'rewritemetoo1' is being rewritten (reason = 4)
  -- but this doesn't work
  create table rewritemetoo3 (a rewritetype);
  alter type rewritetype alter attribute a type varchar cascade;

======================================================================

Evidently the order in which child tables are visited isn't too stable.
I'm inclined to think that that's fine and this regression test needs
reconsideration.

regards, tom lane

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