Re: pg_upgrade from 12 to 13 failes with plpython2

On Wed, Nov 18, 2020 at 09:35:20PM -0700, Rob Sargent wrote:
> > pg_upgrade does have some code to handle plpython call handlers in
> > function.c:get_loadable_libraries();
> >
> > * Systems that install plpython before 8.1 have
> > * plpython_call_handler() defined in the "public" schema, causing
> > * pg_dump to dump it. However that function still references
> > * "plpython" (no "2"), so it throws an error on restore. This code
> > * checks for the problem function, reports affected databases to the
> > * user and explains how to remove them. 8.1 git commit:
> > * e0dedd0559f005d60c69c9772163e69c204bac69
> > * http://archives.postgresql.org/pgsql-hackers/2012-03/msg01101.php
> > * http://archives.postgresql.org/pgsql-bugs/2012-05/msg00206.php
> >
> > --
> > Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
> > EnterpriseDB https://enterprisedb.com
> >
> > The usefulness of a cup is in its emptiness, Bruce Lee
> >
> >
> Unless it stop at prompts for “Yes, ok, I understand.” this could easily fly out the window.

It issues this message and fails:

if (PQntuples(res) > 0)
{
if (!found_public_plpython_handler)
{
pg_log(PG_WARNING,
"\nThe old cluster has a \"plpython_call_handler\" function defined\n"
"in the \"public\" schema which is a duplicate of the one defined\n"
"in the \"pg_catalog\" schema. You can confirm this by executing\n"
"in psql:\n"
"\n"
" \\df *.plpython_call_handler\n"
"\n"
"The \"public\" schema version of this function was created by a\n"
"pre-8.1 install of plpython, and must be removed for pg_upgrade\n"
"to complete because it references a now-obsolete \"plpython\"\n"
"shared object file. You can remove the \"public\" schema version\n"
"of this function by running the following command:\n"
"\n"
" DROP FUNCTION public.plpython_call_handler()\n"
"\n"
"in each affected database:\n"
"\n");
}
pg_log(PG_WARNING, " %s\n", active_db->db_name);
found_public_plpython_handler = true;
}
PQclear(res);
}

PQfinish(conn);
}

if (found_public_plpython_handler)
pg_fatal("Remove the problem functions from the old cluster to continue.\n");

--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EnterpriseDB https://enterprisedb.com

The usefulness of a cup is in its emptiness, Bruce Lee