diff options
Diffstat (limited to 'doc/src/sgml/ref/create_function.sgml')
| -rw-r--r-- | doc/src/sgml/ref/create_function.sgml | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/doc/src/sgml/ref/create_function.sgml b/doc/src/sgml/ref/create_function.sgml index 2a87130356e..7df66ab0e08 100644 --- a/doc/src/sgml/ref/create_function.sgml +++ b/doc/src/sgml/ref/create_function.sgml @@ -26,7 +26,7 @@ CREATE [ OR REPLACE ] FUNCTION | RETURNS TABLE ( <replaceable class="parameter">column_name</replaceable> <replaceable class="parameter">column_type</replaceable> [, ...] ) ] { LANGUAGE <replaceable class="parameter">lang_name</replaceable> | WINDOW - | IMMUTABLE | STABLE | VOLATILE + | IMMUTABLE | STABLE | VOLATILE | LEAKPROOF | CALLED ON NULL INPUT | RETURNS NULL ON NULL INPUT | STRICT | [ EXTERNAL ] SECURITY INVOKER | [ EXTERNAL ] SECURITY DEFINER | COST <replaceable class="parameter">execution_cost</replaceable> @@ -325,6 +325,23 @@ CREATE [ OR REPLACE ] FUNCTION </varlistentry> <varlistentry> + <term><literal>LEAKPROOF</literal></term> + <listitem> + <para> + <literal>LEAKPROOF</literal> indicates that the function has no side + effects. It reveals no information about its arguments other than by + its return value. For example, a function which throws an error message + for some argument values but not others, or which includes the argument + values in any error message, is not leakproof. The query planner may + push leakproof functions (but not others) into views created with the + <literal>security_barrier</literal> option. See + <xref linkend="sql-createview"> and <xref linkend="rules-privileges">. + This option can only be set by the superuser. + </para> + </listitem> + </varlistentry> + + <varlistentry> <term><literal>CALLED ON NULL INPUT</literal></term> <term><literal>RETURNS NULL ON NULL INPUT</literal></term> <term><literal>STRICT</literal></term> |