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docs: Clarify that NULL arg to set_config() means reset to default

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Author: David G. Johnston <david.g.johnston@gmail.com>
Reviewed-by: Zhang Mingli <zmlpostgres@gmail.com>
Discussion: https://www.postgresql.org/message-id/CAKFQuwY0SK6JdCci1VJX6xsztRXgGeVEY-grkENZx%2B3CZpyPcQ@mail.gmail.com
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Heikki Linnakangas 2025-04-04 15:17:17 +03:00
parent 7afca7edef
commit b4f453f6ab
1 changed files with 5 additions and 0 deletions
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doc/src/sgml/func.sgml
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@ -28576,6 +28576,11 @@ acl | {postgres=arwdDxtm/postgres,foo=r/postgres}
use <literal>false</literal> instead. This function corresponds to
the SQL command <xref linkend="sql-set"/>.
</para>
<para>
<function>set_config</function> accepts the NULL value for
<parameter>new_value</parameter>, but as settings cannot be null, it
is interpreted as a request to reset the setting to its default value.
</para>
<para>
<literal>set_config('log_statement_stats', 'off', false)</literal>
<returnvalue>off</returnvalue>