Re: Schema variables - new implementation for Postgres 15

st 24. 8. 2022 v 10:04 odesílatel Erik Rijkers <er(at)xs4all(dot)nl> napsal:

> Op 24-08-2022 om 08:37 schreef Pavel Stehule:
> >>
> >
> > I fixed these.
> >
>
> > [v20220824-1-*.patch]
>
> Hi Pavel,
>
> I noticed just now that variable assignment (i.e., LET) unexpectedly
> (for me anyway) cast the type of the input value. Surely that's wrong?
> The documentation says clearly enough:
>
> 'The result must be of the same data type as the session variable.'
>
>
> Example:
>
> create variable x integer;
> let x=1.5;
> select x, pg_typeof(x);
> x | pg_typeof
> ---+-----------
> 2 | integer
> (1 row)
>
>
> Is this correct?
>
> If such casts (there are several) are intended then the text of the
> documentation should be changed.
>

yes - the behave is designed like plpgsql assignment or SQL assignment

(2022-08-25 19:35:35) postgres=# do $$
postgres$# declare i int;
postgres$# begin
postgres$# i := 1.5;
postgres$# raise notice '%', i;
postgres$# end;
postgres$# $$;
NOTICE: 2
DO

(2022-08-25 19:38:10) postgres=# create table foo1(a int);
CREATE TABLE
(2022-08-25 19:38:13) postgres=# insert into foo1 values(1.5);
INSERT 0 1
(2022-08-25 19:38:21) postgres=# select * from foo1;
┌───┐
│ a │
╞═══╡
│ 2 │
└───┘
(1 row)

There are the same rules as in SQL.

This sentence is not good - the value should be casteable to the target
type.

Regards

Pavel

> Thanks,
>
> Erik
>
>