Re: Handle infinite recursion in logical replication setup

On Mon, Jul 25, 2022 at 12:58 PM Peter Smith  wrote:
>
> Firstly, I have some (case-sensitivity) questions about the previous
> patch which was already pushed [1].
>
> Q1. create_subscription docs
>
> I did not understand why the docs refer to slot_name = NONE, yet the
> newly added option says origin = none/any. I think that saying origin
> = NONE/ANY would be more consistent with the existing usage of NONE in
> this documentation.
>
> ~~~
>
> Q2. parse_subscription_options
>
> Similarly, in the code (parse_subscription_options), I did not
> understand why the checks for special name values are implemented
> differently:
>
> The new 'origin' code is using pg_strcmpcase to check special values
> (none/any), and the old 'slot_name' code uses case-sensitive strcmp to
> check the special value (none).
>

We have a restriction for slot_names for lower case letters (aka
"Replication slot names may only contain lower case letters, numbers,
and the underscore character.") whereas there is no such restriction
in origin name, that's why the check is different. So, if you try with
slot_name = 'NONE', you will get the error.

-- 
With Regards,
Amit Kapila.