On Fri, Jun 29, 2012 at 11:35:15PM -0400, Tom Lane wrote:
> Bruce Momjian <br...@momjian.us> writes:
> > I can't think of how to fix this.  Perhaps we need to query the
> > pg_extension table as of the SELECT function all.
> 
> I think you're misjudging the core of the issue.  The same thing
> would happen if somebody dropped and recreated the public schema.
> Or anything else that we create at initdb time but allow to be
> dropped.

I just tested dropping and recreating the 'public' schema and pg_upgrade
worked fine.

I think the fix we need for extensions is to change:

        SELECT binary_upgrade.create_empty_extension('plpgsql',
        'pg_catalog', false, '1.0', NULL, NULL,
        ARRAY[]::pg_catalog.text[]);

to

        SELECT binary_upgrade.create_empty_extension('plpgsql',
        'pg_catalog', false, '1.0', NULL, NULL, ARRAY[]::pg_catalog.text[])
        WHERE (SELECT COUNT(*) FROM pg_extension WHERE extname = 'plpgsql') = 0;

This basically conditionally calls
binary_upgrade.create_empty_extension() based on whether the extension
already exists in the new cluster.  

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

  + It's impossible for everything to be true. +

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