Re: [WIP] CREATE SUBSCRIPTION with FOR TABLES clause (table filter)

Hi, Evgeniy!

Thanks for working on the feature.
> 28 нояб. 2018 г., в 21:41, Evgeniy Efimkin <efimkin(at)yandex-team(dot)ru> написал(а):
>
> Hello!
> I wrote some tests(it's just 01_rep_changes.pl but for non superuser) and fix `DROP TABLE` from subscription. Now old and new tests pass.
>
> 22.11.2018, 16:23, "Evgeniy Efimkin" <efimkin(at)yandex-team(dot)ru>:
>> Hello!
>> New draft attached with filtering table in subscription (ADD/DROP) and allow non-superusers use` CREATE SUBSCRIPTION` for own tables.

I've looked into the patch. The code looks good and coherent to nearby code.
There are no docs, obviously, there is WiP.

I've got few questions:
1. How will the subscription work for inherited tables? Do we need tests for that?
2. ALTER PUBLICATION has ADD\DROP and SET. Should we add SET too? Or is there a reason not to do that?
3. Message "Must be superuser to create FOR ALL TABLES subscriptions" seems a bit strange to me. Also, this literal is embedded into translations. I do not know how we deal with it, how do we deal for example with "måste vara superanvändare för att skapa prenumerationer" or "для создания подписок нужно быть суперпользователем"? Where do we insert FOR ALL TABLES?
4. How does default behavior differ from FOR ALL TABLES?
5. Can we alter subscription FOR ALL TABLES? Drop some tables out of the subscription?

Best regards, Andrey Borodin.