From: Zsolt Parragi <zsolt.parragi@percona.com>
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Date: Tue, 9 Jun 2026 16:36:13 -0500
Message-ID: 
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Subject: Re: Support EXCEPT for TABLES IN SCHEMA publications
To: pgsql-hackers@lists.postgresql.org
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Precedence: bulk

> Do you mean other.t should be there?

Yes, that was a typo in my example.

> After considering, I chose to follow behavior similar to existing FOR
> ALL TABLES publications to handle schema-switch cases. Today, if a
> table excluded via EXCEPT is dropped, the corresponding prexcept entry
> is removed, and recreating a table with the same name does not
> automatically restore the exclusion.
>
> I applied the same principle to schema changes: once an excluded table
> moves out of the schema, the exclusion is removed.

I'm not that sure about the analogy. DROP TABLE is a destructive
operation, executing DROP TABLE and then CREATE TABLE won't
automatically bring back the data.

With this approach, two cheap ALTER TABLE ... SET SCHEMA statements
can clear an EXCEPT clause without the proper permissions.

But I'm not sure what's the best solution for this. The v11 approach
is at least more consistent than the previous behavior.

> 1) Reject the schema change: Error out if a table with a prexcept
> entry is moved between schemas. This feels overly restrictive.

It is restrictive, but maybe it's the better solution? Or
alternatively, maybe it should require proper permissions to remove
the except clause?

Another thing that could improve this if we would print out a warning
that the statement caused a change in the publication? But then that's
also a question for the preexisting drop table case.