RE: [PoC] pg_upgrade: allow to upgrade publisher node

Dear Amit,

Thank you for reviewing! New version can be available in [1].

>
> +{ oid => '8046', descr => 'for use by pg_upgrade',
> + proname => 'binary_upgrade_validate_wal_records',
> + prorows => '10', proretset => 't', provolatile => 's', prorettype => 'bool',
> + proargtypes => 'pg_lsn', proallargtypes => '{pg_lsn,bool}',
> + proargmodes => '{i,o}', proargnames => '{start_lsn,is_ok}',
> + prosrc => 'binary_upgrade_validate_wal_records' },
>
> In this many of the fields seem bogus. For example, we don't need
> prorows => '10', proretset => 't' for this function. Similarly
> proargmodes also look incorrect as we don't have any out parameter.
>

The part was made in old versions and has kept till now. I rechecked them and
changed like below:

* This function just returns boolean, proretset was changed to 'f'.
* Based on above, prorows should be zero. Removed.
* Returned value is quite depended on the internal status, provolatile was
changed to 'v'.
* There are no OUT and INOUT arguments, no need to set proallargtypes and proargmodes.
Removed.
* Anonymous arguments are allowed, proargnames was removed NULL.
* This function is not expected to be call in parallel. proparallel was set to 'u'.
* The argument must not be NULL, and we should error out. proisstrict was changed 'f'.
Also, the check was added to the function.

[1]: https://www.postgresql.org/message-id/TYAPR01MB586615579356A84A8CF29A00F5F9A%40TYAPR01MB5866.jpnprd01.prod.outlook.com

Best Regards,
Hayato Kuroda
FUJITSU LIMITED