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postgres_fdw: Allow application_name of remote connection to be set via GUC.

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This commit adds postgres_fdw.application_name GUC which specifies
a value for application_name configuration parameter used
when postgres_fdw establishes a connection to a foreign server.
This GUC setting always overrides application_name option of
the foreign server object. This GUC is useful when we want to
specify our own application_name per remote connection.

Previously application_name of a remote connection could be set
basically only via options of a server object. But which meant that
every session connecting to the same foreign server basically
should use the same application_name. Also if we want to change
the setting, we had to execute "ALTER SERVER ... OPTIONS ..." command.
It was inconvenient.

Author: Hayato Kuroda
Reviewed-by: Masahiro Ikeda, Fujii Masao
Discussion: https://postgr.es/m/TYCPR01MB5870D1E8B949DAF6D3B84E02F5F29@TYCPR01MB5870.jpnprd01.prod.outlook.com
This commit is contained in:
Fujii Masao
2021-09-07 12:27:30 +09:00
parent 4c3478859b
commit 449ab63505
6 changed files with 199 additions and 5 deletions
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25
doc/src/sgml/postgres-fdw.sgml
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@ -905,6 +905,31 @@ postgres=# SELECT postgres_fdw_disconnect_all();
</para>
</sect2>
<sect2>
<title>Configuration Parameters</title>
<variablelist>
<varlistentry>
<term>
<varname>postgres_fdw.application_name</varname> (<type>string</type>)
<indexterm>
<primary><varname>postgres_fdw.application_name</varname> configuration parameter</primary>
</indexterm>
</term>
<listitem>
<para>
Specifies a value for <xref linkend="guc-application-name"/>
configuration parameter used when <filename>postgres_fdw</filename>
establishes a connection to a foreign server. This overrides
<varname>application_name</varname> option of the server object.
Note that change of this parameter doesn't affect any existing
connections until they are re-established.
</para>
</listitem>
</varlistentry>
</variablelist>
</sect2>
<sect2>
<title>Examples</title>