Re: Schema variables - new implementation for Postgres 15
От | Pavel Stehule |
---|---|
Тема | Re: Schema variables - new implementation for Postgres 15 |
Дата | |
Msg-id | CAFj8pRCLqQa6z2nqfPwUZJCc3zcHBanzZmDt8y0pOFLs3_9oGw@mail.gmail.com обсуждение исходный текст |
Ответ на | Re: Schema variables - new implementation for Postgres 15 (Erik Rijkers <er@xs4all.nl>) |
Список | pgsql-hackers |
st 24. 8. 2022 v 10:04 odesílatel Erik Rijkers <er@xs4all.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.
I changed this
@@ -58,8 +58,9 @@ LET <replaceable class="parameter">session_variable</replaceable> = DEFAULT
<term><literal>sql_expression</literal></term>
<listitem>
<para>
- An SQL expression, in parentheses. The result must be of the same data type as the session
- variable.
+ An SQL expression (can be subquery in parenthesis). The result must
+ be of castable to the same data type as the session variable (in
+ implicit or assignment context).
</para>
</listitem>
</varlistentry>
<term><literal>sql_expression</literal></term>
<listitem>
<para>
- An SQL expression, in parentheses. The result must be of the same data type as the session
- variable.
+ An SQL expression (can be subquery in parenthesis). The result must
+ be of castable to the same data type as the session variable (in
+ implicit or assignment context).
</para>
</listitem>
</varlistentry>
is it ok?
Regards
Pavel
Thanks,
Erik
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