When looking at the report in [0] an API choice in the relevant pg_upgrade code
path stood out as curious.  check_is_install_user() runs this query to ensure
that only the install user is present in the cluster:

    res = executeQueryOrDie(conn,
                            "SELECT COUNT(*) "
                            "FROM pg_catalog.pg_roles "
                            "WHERE rolname !~ '^pg_'");

The result is then verified with the following:

    if (cluster == &new_cluster && atooid(PQgetvalue(res, 0, 0)) != 1)
        pg_fatal("Only the install user can be defined in the new cluster.");

This was changed from atoi() in ee646df59 with no specific comment on why.
This is not a bug, since atooid() will do the right thing here, but it threw me
off reading the code and might well confuse others.  Is there a reason not to
change this back to atoi() for code clarity as we're not reading an Oid here?

--
Daniel Gustafsson

[0] 
ve1p191mb1118e9752d4ead45205e995cd6...@ve1p191mb1118.eurp191.prod.outlook.com

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