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><H1
><A
NAME="SQL-ALTERFUNCTION"
></A
>ALTER FUNCTION</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN63538"
></A
><H2
>Name</H2
>ALTER FUNCTION -- change the definition of a function</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN63543"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>ALTER FUNCTION <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> ( [ [ <TT
CLASS="REPLACEABLE"
><I
>argmode</I
></TT
> ] [ <TT
CLASS="REPLACEABLE"
><I
>argname</I
></TT
> ] <TT
CLASS="REPLACEABLE"
><I
>argtype</I
></TT
> [, ...] ] )
<TT
CLASS="REPLACEABLE"
><I
>action</I
></TT
> [ ... ] [ RESTRICT ]
ALTER FUNCTION <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> ( [ [ <TT
CLASS="REPLACEABLE"
><I
>argmode</I
></TT
> ] [ <TT
CLASS="REPLACEABLE"
><I
>argname</I
></TT
> ] <TT
CLASS="REPLACEABLE"
><I
>argtype</I
></TT
> [, ...] ] )
RENAME TO <TT
CLASS="REPLACEABLE"
><I
>new_name</I
></TT
>
ALTER FUNCTION <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> ( [ [ <TT
CLASS="REPLACEABLE"
><I
>argmode</I
></TT
> ] [ <TT
CLASS="REPLACEABLE"
><I
>argname</I
></TT
> ] <TT
CLASS="REPLACEABLE"
><I
>argtype</I
></TT
> [, ...] ] )
OWNER TO <TT
CLASS="REPLACEABLE"
><I
>new_owner</I
></TT
>
ALTER FUNCTION <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> ( [ [ <TT
CLASS="REPLACEABLE"
><I
>argmode</I
></TT
> ] [ <TT
CLASS="REPLACEABLE"
><I
>argname</I
></TT
> ] <TT
CLASS="REPLACEABLE"
><I
>argtype</I
></TT
> [, ...] ] )
SET SCHEMA <TT
CLASS="REPLACEABLE"
><I
>new_schema</I
></TT
>
<SPAN
CLASS="phrase"
><SPAN
CLASS="PHRASE"
>where <TT
CLASS="REPLACEABLE"
><I
>action</I
></TT
> is one of:</SPAN
></SPAN
>
CALLED ON NULL INPUT | RETURNS NULL ON NULL INPUT | STRICT
IMMUTABLE | STABLE | VOLATILE | [ NOT ] LEAKPROOF
[ EXTERNAL ] SECURITY INVOKER | [ EXTERNAL ] SECURITY DEFINER
COST <TT
CLASS="REPLACEABLE"
><I
>execution_cost</I
></TT
>
ROWS <TT
CLASS="REPLACEABLE"
><I
>result_rows</I
></TT
>
SET <TT
CLASS="REPLACEABLE"
><I
>configuration_parameter</I
></TT
> { TO | = } { <TT
CLASS="REPLACEABLE"
><I
>value</I
></TT
> | DEFAULT }
SET <TT
CLASS="REPLACEABLE"
><I
>configuration_parameter</I
></TT
> FROM CURRENT
RESET <TT
CLASS="REPLACEABLE"
><I
>configuration_parameter</I
></TT
>
RESET ALL</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN63573"
></A
><H2
>Description</H2
><P
> <TT
CLASS="COMMAND"
>ALTER FUNCTION</TT
> changes the definition of a
function.
</P
><P
> You must own the function to use <TT
CLASS="COMMAND"
>ALTER FUNCTION</TT
>.
To change a function's schema, you must also have <TT
CLASS="LITERAL"
>CREATE</TT
>
privilege on the new schema.
To alter the owner, you must also be a direct or indirect member of the new
owning role, and that role must have <TT
CLASS="LITERAL"
>CREATE</TT
> privilege on
the function's schema. (These restrictions enforce that altering the owner
doesn't do anything you couldn't do by dropping and recreating the function.
However, a superuser can alter ownership of any function anyway.)
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN63581"
></A
><H2
>Parameters</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
></DT
><DD
><P
> The name (optionally schema-qualified) of an existing function.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>argmode</I
></TT
></DT
><DD
><P
> The mode of an argument: <TT
CLASS="LITERAL"
>IN</TT
>, <TT
CLASS="LITERAL"
>OUT</TT
>,
<TT
CLASS="LITERAL"
>INOUT</TT
>, or <TT
CLASS="LITERAL"
>VARIADIC</TT
>.
If omitted, the default is <TT
CLASS="LITERAL"
>IN</TT
>.
Note that <TT
CLASS="COMMAND"
>ALTER FUNCTION</TT
> does not actually pay
any attention to <TT
CLASS="LITERAL"
>OUT</TT
> arguments, since only the input
arguments are needed to determine the function's identity.
So it is sufficient to list the <TT
CLASS="LITERAL"
>IN</TT
>, <TT
CLASS="LITERAL"
>INOUT</TT
>,
and <TT
CLASS="LITERAL"
>VARIADIC</TT
> arguments.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>argname</I
></TT
></DT
><DD
><P
> The name of an argument.
Note that <TT
CLASS="COMMAND"
>ALTER FUNCTION</TT
> does not actually pay
any attention to argument names, since only the argument data
types are needed to determine the function's identity.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>argtype</I
></TT
></DT
><DD
><P
> The data type(s) of the function's arguments (optionally
schema-qualified), if any.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>new_name</I
></TT
></DT
><DD
><P
> The new name of the function.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>new_owner</I
></TT
></DT
><DD
><P
> The new owner of the function. Note that if the function is
marked <TT
CLASS="LITERAL"
>SECURITY DEFINER</TT
>, it will subsequently
execute as the new owner.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>new_schema</I
></TT
></DT
><DD
><P
> The new schema for the function.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>CALLED ON NULL INPUT</TT
><BR><TT
CLASS="LITERAL"
>RETURNS NULL ON NULL INPUT</TT
><BR><TT
CLASS="LITERAL"
>STRICT</TT
></DT
><DD
><P
><TT
CLASS="LITERAL"
>CALLED ON NULL INPUT</TT
> changes the function so
that it will be invoked when some or all of its arguments are
null. <TT
CLASS="LITERAL"
>RETURNS NULL ON NULL INPUT</TT
> or
<TT
CLASS="LITERAL"
>STRICT</TT
> changes the function so that it is not
invoked if any of its arguments are null; instead, a null result
is assumed automatically. See <A
HREF="sql-createfunction.html"
>CREATE FUNCTION</A
>
for more information.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>IMMUTABLE</TT
><BR><TT
CLASS="LITERAL"
>STABLE</TT
><BR><TT
CLASS="LITERAL"
>VOLATILE</TT
></DT
><DD
><P
> Change the volatility of the function to the specified setting.
See <A
HREF="sql-createfunction.html"
>CREATE FUNCTION</A
> for details.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>[<SPAN
CLASS="OPTIONAL"
> EXTERNAL </SPAN
>] SECURITY INVOKER</TT
><BR><TT
CLASS="LITERAL"
>[<SPAN
CLASS="OPTIONAL"
> EXTERNAL </SPAN
>] SECURITY DEFINER</TT
></DT
><DD
><P
> Change whether the function is a security definer or not. The
key word <TT
CLASS="LITERAL"
>EXTERNAL</TT
> is ignored for SQL
conformance. See <A
HREF="sql-createfunction.html"
>CREATE FUNCTION</A
> for more information about
this capability.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>LEAKPROOF</TT
></DT
><DD
><P
> Change whether the function is considered leakproof or not.
See <A
HREF="sql-createfunction.html"
>CREATE FUNCTION</A
> for more information about
this capability.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>COST</TT
> <TT
CLASS="REPLACEABLE"
><I
>execution_cost</I
></TT
></DT
><DD
><P
> Change the estimated execution cost of the function.
See <A
HREF="sql-createfunction.html"
>CREATE FUNCTION</A
> for more information.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>ROWS</TT
> <TT
CLASS="REPLACEABLE"
><I
>result_rows</I
></TT
></DT
><DD
><P
> Change the estimated number of rows returned by a set-returning
function. See <A
HREF="sql-createfunction.html"
>CREATE FUNCTION</A
> for more information.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>configuration_parameter</I
></TT
><BR><TT
CLASS="REPLACEABLE"
><I
>value</I
></TT
></DT
><DD
><P
> Add or change the assignment to be made to a configuration parameter
when the function is called. If
<TT
CLASS="REPLACEABLE"
><I
>value</I
></TT
> is <TT
CLASS="LITERAL"
>DEFAULT</TT
>
or, equivalently, <TT
CLASS="LITERAL"
>RESET</TT
> is used, the function-local
setting is removed, so that the function executes with the value
present in its environment. Use <TT
CLASS="LITERAL"
>RESET
ALL</TT
> to clear all function-local settings.
<TT
CLASS="LITERAL"
>SET FROM CURRENT</TT
> saves the value of the parameter that
is current when <TT
CLASS="COMMAND"
>ALTER FUNCTION</TT
> is executed as the value
to be applied when the function is entered.
</P
><P
> See <A
HREF="sql-set.html"
>SET</A
> and
<A
HREF="runtime-config.html"
>Chapter 18</A
>
for more information about allowed parameter names and values.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>RESTRICT</TT
></DT
><DD
><P
> Ignored for conformance with the SQL standard.
</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN63706"
></A
><H2
>Examples</H2
><P
> To rename the function <TT
CLASS="LITERAL"
>sqrt</TT
> for type
<TT
CLASS="TYPE"
>integer</TT
> to <TT
CLASS="LITERAL"
>square_root</TT
>:
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER FUNCTION sqrt(integer) RENAME TO square_root;</PRE
><P>
</P
><P
> To change the owner of the function <TT
CLASS="LITERAL"
>sqrt</TT
> for type
<TT
CLASS="TYPE"
>integer</TT
> to <TT
CLASS="LITERAL"
>joe</TT
>:
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER FUNCTION sqrt(integer) OWNER TO joe;</PRE
><P>
</P
><P
> To change the schema of the function <TT
CLASS="LITERAL"
>sqrt</TT
> for type
<TT
CLASS="TYPE"
>integer</TT
> to <TT
CLASS="LITERAL"
>maths</TT
>:
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER FUNCTION sqrt(integer) SET SCHEMA maths;</PRE
><P>
</P
><P
> To adjust the search path that is automatically set for a function:
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER FUNCTION check_password(text) SET search_path = admin, pg_temp;</PRE
><P>
</P
><P
> To disable automatic setting of <TT
CLASS="VARNAME"
>search_path</TT
> for a function:
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER FUNCTION check_password(text) RESET search_path;</PRE
><P>
The function will now execute with whatever search path is used by its
caller.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN63728"
></A
><H2
>Compatibility</H2
><P
> This statement is partially compatible with the <TT
CLASS="COMMAND"
>ALTER
FUNCTION</TT
> statement in the SQL standard. The standard allows more
properties of a function to be modified, but does not provide the
ability to rename a function, make a function a security definer,
attach configuration parameter values to a function,
or change the owner, schema, or volatility of a function. The standard also
requires the <TT
CLASS="LITERAL"
>RESTRICT</TT
> key word, which is optional in
<SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN63734"
></A
><H2
>See Also</H2
><A
HREF="sql-createfunction.html"
>CREATE FUNCTION</A
>, <A
HREF="sql-dropfunction.html"
>DROP FUNCTION</A
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