Cannot upgrade to v12 due to sql_identifier data type I am attempted to upgrade Postgres 11.8 to 12.3 on an AWS RDS instance. The upgrade fails with the following error:

Your installation contains the &quot;sql_identifier&quot; data type in user tables
and/or indexes.  The on-disk format for this data type has changed, so this
cluster cannot currently be upgraded.  You can remove the problem tables or
change the data type to &quot;name&quot; and restart the upgrade.
A list of the problem columns is in the file:
tables_using_sql_identifier.txt

I do not have access to this file. I believe it is not available to AWS users. I can find the sql_identifier columns with the following:
SELECT 
atttypid::regtype, *
FROM   pg_attribute
WHERE  attrelid = 'information_schema.columns'::regclass
ORDER  BY attnum

I can update all of the columns to be of type &quot;name&quot; but changing the information_schema tables seems aggressive and I cannot find any information about this error anywhere on the internet. Any thoughts are appreciated.
You need to find the columns with that type outside of information_schema.  Information_schema is not user tables, they are system tables.
SELECT * 
FROM pg_attribute 
  join pg_class on attrelid=oid 
  join pg_namespace on relnamespace=pg_namespace.oid 
WHERE atttypid::regtype::text like '%sql_identifier' 
  and nspname!='information_schema'