| From: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
|---|---|
| To: | Wolfgang Walther <walther(at)technowledgy(dot)de> |
| Cc: | Dmitry Dolgov <9erthalion6(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Peter Eisentraut <peter(at)eisentraut(dot)org>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, Sergey Shinderuk <s(dot)shinderuk(at)postgrespro(dot)ru>, Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, Julien Rouhaud <rjuju123(at)gmail(dot)com>, dean(dot)a(dot)rasheed(at)gmail(dot)com, er(at)xs4all(dot)nl, joel(at)compiler(dot)org, pgsql-hackers(at)lists(dot)postgresql(dot)org |
| Subject: | Re: Schema variables - new implementation for Postgres 15 |
| Date: | 2024-05-31 13:02:49 |
| Message-ID: | CAFj8pRDWVaM4azo-DMRNemgRtPCW1V2+UdtKz+1sHzuz6j5kqg@mail.gmail.com |
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| Lists: | pgsql-hackers |
pá 31. 5. 2024 v 13:37 odesílatel Wolfgang Walther <walther(at)technowledgy(dot)de>
napsal:
> Pavel Stehule:
> > But in this case you could make variables and tables share the same
> > namespace, i.e. forbid creating a variable with the same name as an
> > already existing table.
> >
> >
> > It helps, but not on 100% - there is a search path
>
> I think we can ignore the search_path for this discussion. That's not a
> problem of variables vs tables, but just a search path related problem.
> It is exactly the same thing right now, when you create a new table x(x)
> in a schema which happens to be earlier in your search path.
>
I don't think it is a valid argument - search_path is there, and we cannot
ignore it, because it allows just one case.
And the need to use a variable in FROM clause introduces implicit unpacking
or inconsistency with current work with composite's types, so I am more
sure this way is not good.
>
> The objection to the proposed approach for variables was that it would
> introduce *new* ambiguities, which Alvaro's suggestion avoids.
>
> Best,
>
> Wolfgang
>
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