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doc: improve ALTER SYSTEM description of value list quoting 

Reported-by: splarv@ya.ru

Discussion: https://postgr.es/m/167105927893.1897.13227723035830709578@wrigleys.postgresql.org

Backpatch-through: 11
This commit is contained in:
Bruce Momjian 2023-10-31 10:21:32 -04:00
parent b69db51736
commit 87cf7b63c4
1 changed files with 9 additions and 1 deletions
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10
doc/src/sgml/ref/alter_system.sgml
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@ -21,7 +21,7 @@ PostgreSQL documentation
<refsynopsisdiv>
<synopsis>
ALTER SYSTEM SET <replaceable class="parameter">configuration_parameter</replaceable> { TO | = } { <replaceable class="parameter">value</replaceable> | '<replaceable class="parameter">value</replaceable>' | DEFAULT }
ALTER SYSTEM SET <replaceable class="parameter">configuration_parameter</replaceable> { TO | = } { <replaceable class="parameter">value</replaceable> [, ...] | DEFAULT }
ALTER SYSTEM RESET <replaceable class="parameter">configuration_parameter</replaceable>
ALTER SYSTEM RESET ALL
@ -83,9 +83,17 @@ ALTER SYSTEM RESET ALL
New value of the parameter. Values can be specified as string
constants, identifiers, numbers, or comma-separated lists of
these, as appropriate for the particular parameter.
Values that are neither numbers nor valid identifiers must be quoted.
<literal>DEFAULT</literal> can be written to specify removing the
parameter and its value from <filename>postgresql.auto.conf</filename>.
</para>
<para>
For some list-accepting parameters, quoted values will produce
double-quoted output to preserve whitespace and commas; for others,
double-quotes must be used inside single-quoted strings to get
this effect.
</para>
</listitem>
</varlistentry>
</variablelist>