On Wed, Feb 20, 2019 at 12:59:45PM +0000, PG Doc comments form wrote:
> The following documentation comment has been logged on the website:
>
> Page: https://www.postgresql.org/docs/11/functions-admin.html
> Description:
>
> Hi.
>
> Doc is not clear about what is returned if current_setting(
> 'app.not_existent', true ) is called.
>
> Does it return empty string '', because return type is 'text' or it return
> NULL, because 'app.not_existent' does not exist
Testing shows:
SELECT current_setting('asdf', true);
current_setting
-----------------
\pset null (null)
SELECT current_setting('asdf', true);
current_setting
-----------------
--> (null)
How do you like the attached patch, which clarifies this?
--
Bruce Momjian <[email protected]> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ As you are, so once was I. As I am, so you will be. +
+ Ancient Roman grave inscription +
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
new file mode 100644
index 86ff4e5..f638c6d
*** a/doc/src/sgml/func.sgml
--- b/doc/src/sgml/func.sgml
*************** SELECT current_setting('datestyle');
*** 18722,18728 ****
If there is no setting named <parameter>setting_name</parameter>,
<function>current_setting</function> throws an error
unless <parameter>missing_ok</parameter> is supplied and is
! <literal>true</literal>.
</para>
<para>
--- 18722,18729 ----
If there is no setting named <parameter>setting_name</parameter>,
<function>current_setting</function> throws an error
unless <parameter>missing_ok</parameter> is supplied and is
! <literal>true</literal>, in which case a missing parameter returns
! NULL.
</para>
<para>
