Tom Lane wrote:
> Bruce Momjian <br...@momjian.us> writes:
> > Sorry to be commenting late, but don't most people want to add to the
> > end or beginning of the enum list, rather than in the middle, and can't
> > we support that already?
> 
> We could allow adding a value, but we couldn't guarantee where it would
> appear in the type's sort ordering.  Depending on the current OID
> counter it would usually show up either at the end or the beginning.
> I think the general feeling is that this is too implementation-dependent
> to be acceptable.

Well, we don't need the enum value to map into the entire oid range. 
Can't we just add one to the top-most value and see if there is a
conflict?

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

  + None of us is going to be here forever. +

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