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help / color / mirror / Atom feedFrom: David G. Johnston <[email protected]>
To: Amit Kapila <[email protected]>
Cc: Peter Smith <[email protected]>
Cc: shveta malik <[email protected]>
Cc: Shlok Kyal <[email protected]>
Cc: vignesh C <[email protected]>
Cc: Dilip Kumar <[email protected]>
Cc: Zhijie Hou (Fujitsu) <[email protected]>
Cc: YeXiu <[email protected]>
Cc: Ian Lawrence Barwick <[email protected]>
Cc: Bharath Rupireddy <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: Skipping schema changes in publication
Date: Sun, 8 Feb 2026 22:22:55 -0800
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On Sunday, February 8, 2026, Amit Kapila <[email protected]> wrote:
> On Mon, Feb 9, 2026 at 6:41 AM Peter Smith <[email protected]> wrote:
>
> > Hi Amit.
> >
> > I understand there can be some tricky scenarios where partitions are
> > involved, but I was not sure why "pub1: FOR ALL Tables EXCEPT (tab1)
> > and pub2: FOR TABLE tab1" is an example of contradictory behaviour.
> >
> > Consider if the publisher has 3 tables tab1,tab2,tab3:
> > Here, "pub1: FOR ALL Tables EXCEPT (tab1)" is like a shorthand for
> > saying "pub1: FOR TABLE tab2,tab3"
> > So what's wrong for the subscriber to combine pub1 and pub2 in this case?
> >
>
> It is because one of the publications (pub2) indicates to include a
> particular table tab1 and the other one (pub1) to exclude the same
> table. And things become much more complex when the Except list
> contains partitions as shown in Shveta's example. So, I think it makes
> sense to keep things simple at least for the first version, we can
> consider to uplift this restriction if we see some use cases from the
> field.
>
>
>
I’m with Peter here - I do not think it is wise to expose the exception
listing outside the publication. Publication combinations should be purely
additive in much the same way grants are in the system. Except lists are
internal shorthand for describing the positive list of tables a publication
makes available - all tables except.
David J.
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Subject: Re: Skipping schema changes in publication
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