| From: | Wolfgang Walther <walther(at)technowledgy(dot)de> |
|---|---|
| To: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
| 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 13:29:29 |
| Message-ID: | 21674615-582e-42d0-b9a8-4dadbc8b7dad@technowledgy.de |
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| Lists: | pgsql-hackers |
Pavel Stehule:
> The session variables can be used in queries, but should be used in
> PL/pgSQL expressions, and then the mandatory usage in FROM clause will
> do lot of problems and unreadable code like
>
> DO $$
> BEGIN
> RAISE NOTICE '% %', (SELECT x FROM x), (SELECT a,b FROM y);
>
> END
> $$
>
> This requirement does variables unusable in PL
I already proposed earlier to only require listing them in FROM when
there is actually a related FROM.
In this case you could still write:
RAISE NOTICE '% %', x, (SELECT a,b FROM y);
(assuming only x is a variable here)
Best,
Wolfgang
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