Re: [PATCH] Add pg_get_subscription_ddl() function - Mailing list pgsql-hackers

On 2025-Nov-07, Vaibhav Dalvi wrote:

> On Thu, Nov 6, 2025 at 9:18 PM Álvaro Herrera <alvherre@kurilemu.de> wrote:
> 
> > Hello Vaibhav,
> >
> > I wonder why is Subscription->publications a list of String rather than
> > a list of C strings.  That's something you'd see in a Node structure,
> > but Subscription is not a node, so this seems wasteful and pointless.
> >
> 
> I looked more into this and came to know that we can't make
> Subscription->publications a list of C strings because input publications
> list is also in the list of String from the parser:
> 
> CreateSubscriptionStmt:
> CREATE SUBSCRIPTION name CONNECTION Sconst PUBLICATION name_list
> opt_definition
> {
> CreateSubscriptionStmt *n =
> makeNode(CreateSubscriptionStmt);
> n->subname = $3;
> n->conninfo = $5;
> n->publication = $7;
> n->options = $8;
> $$ = (Node *) n;
> };

But this is a CreateSubscriptionStmt (which is indeed a Node), not a
Subscription (which isn't).  Different thing.

-- 
Álvaro Herrera               48°01'N 7°57'E  —  https://www.EnterpriseDB.com/
"In fact, the basic problem with Perl 5's subroutines is that they're not
crufty enough, so the cruft leaks out into user-defined code instead, by
the Conservation of Cruft Principle."  (Larry Wall, Apocalypse 6)