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Allow referring to functions without arguments when unique

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In DDL commands referring to an existing function, allow omitting the
argument list if the function name is unique in its schema, per SQL
standard.

This uses the same logic that the regproc type uses for finding
functions by name only.

Reviewed-by: Michael Paquier <michael.paquier@gmail.com>
This commit is contained in:
Peter Eisentraut
2017-03-09 23:58:48 -05:00
parent 3f6ea5fc8d
commit aefeb68741
17 changed files with 143 additions and 28 deletions
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2
doc/src/sgml/ref/alter_extension.sgml
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@ -39,7 +39,7 @@ ALTER EXTENSION <replaceable class="PARAMETER">name</replaceable> DROP <replacea
EVENT TRIGGER <replaceable class="PARAMETER">object_name</replaceable> |
FOREIGN DATA WRAPPER <replaceable class="PARAMETER">object_name</replaceable> |
FOREIGN TABLE <replaceable class="PARAMETER">object_name</replaceable> |
FUNCTION <replaceable class="PARAMETER">function_name</replaceable> ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] ) |
FUNCTION <replaceable class="PARAMETER">function_name</replaceable> [ ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] ) ] |
MATERIALIZED VIEW <replaceable class="PARAMETER">object_name</replaceable> |
OPERATOR <replaceable class="PARAMETER">operator_name</replaceable> (<replaceable class="PARAMETER">left_type</replaceable>, <replaceable class="PARAMETER">right_type</replaceable>) |
OPERATOR CLASS <replaceable class="PARAMETER">object_name</replaceable> USING <replaceable class="parameter">index_method</replaceable> |

13
doc/src/sgml/ref/alter_function.sgml
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@ -21,15 +21,15 @@ PostgreSQL documentation
<refsynopsisdiv>
<synopsis>
ALTER FUNCTION <replaceable>name</replaceable> ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] )
ALTER FUNCTION <replaceable>name</replaceable> [ ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] ) ]
<replaceable class="PARAMETER">action</replaceable> [ ... ] [ RESTRICT ]
ALTER FUNCTION <replaceable>name</replaceable> ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] )
ALTER FUNCTION <replaceable>name</replaceable> [ ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] ) ]
RENAME TO <replaceable>new_name</replaceable>
ALTER FUNCTION <replaceable>name</replaceable> ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] )
ALTER FUNCTION <replaceable>name</replaceable> [ ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] ) ]
OWNER TO { <replaceable>new_owner</replaceable> | CURRENT_USER | SESSION_USER }
ALTER FUNCTION <replaceable>name</replaceable> ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] )
ALTER FUNCTION <replaceable>name</replaceable> [ ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] ) ]
SET SCHEMA <replaceable>new_schema</replaceable>
ALTER FUNCTION <replaceable>name</replaceable> ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] )
ALTER FUNCTION <replaceable>name</replaceable> [ ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] ) ]
DEPENDS ON EXTENSION <replaceable>extension_name</replaceable>
<phrase>where <replaceable class="PARAMETER">action</replaceable> is one of:</phrase>
@ -75,7 +75,8 @@ ALTER FUNCTION <replaceable>name</replaceable> ( [ [ <replaceable class="paramet
<term><replaceable class="parameter">name</replaceable></term>
<listitem>
<para>
The name (optionally schema-qualified) of an existing function.
The name (optionally schema-qualified) of an existing function. If no
argument list is specified, the name must be unique in its schema.
</para>
</listitem>
</varlistentry>

7
doc/src/sgml/ref/alter_opfamily.sgml
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@ -25,7 +25,7 @@ ALTER OPERATOR FAMILY <replaceable>name</replaceable> USING <replaceable class="
{ OPERATOR <replaceable class="parameter">strategy_number</replaceable> <replaceable class="parameter">operator_name</replaceable> ( <replaceable class="parameter">op_type</replaceable>, <replaceable class="parameter">op_type</replaceable> )
[ FOR SEARCH | FOR ORDER BY <replaceable class="parameter">sort_family_name</replaceable> ]
| FUNCTION <replaceable class="parameter">support_number</replaceable> [ ( <replaceable class="parameter">op_type</replaceable> [ , <replaceable class="parameter">op_type</replaceable> ] ) ]
<replaceable class="parameter">function_name</replaceable> ( <replaceable class="parameter">argument_type</replaceable> [, ...] )
<replaceable class="parameter">function_name</replaceable> [ ( <replaceable class="parameter">argument_type</replaceable> [, ...] ) ]
} [, ... ]
ALTER OPERATOR FAMILY <replaceable>name</replaceable> USING <replaceable class="parameter">index_method</replaceable> DROP
@ -195,8 +195,9 @@ ALTER OPERATOR FAMILY <replaceable>name</replaceable> USING <replaceable class="
<term><replaceable class="parameter">function_name</replaceable></term>
<listitem>
<para>
The name (optionally schema-qualified) of a function that is an
index method support procedure for the operator family.
The name (optionally schema-qualified) of a function that is an index
method support procedure for the operator family. If no argument list
is specified, the name must be unique in its schema.
</para>
</listitem>
</varlistentry>

2
doc/src/sgml/ref/comment.sgml
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@ -37,7 +37,7 @@ COMMENT ON
EVENT TRIGGER <replaceable class="PARAMETER">object_name</replaceable> |
FOREIGN DATA WRAPPER <replaceable class="PARAMETER">object_name</replaceable> |
FOREIGN TABLE <replaceable class="PARAMETER">object_name</replaceable> |
FUNCTION <replaceable class="PARAMETER">function_name</replaceable> ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] ) |
FUNCTION <replaceable class="PARAMETER">function_name</replaceable> [ ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] ) ] |
INDEX <replaceable class="PARAMETER">object_name</replaceable> |
LARGE OBJECT <replaceable class="PARAMETER">large_object_oid</replaceable> |
MATERIALIZED VIEW <replaceable class="PARAMETER">object_name</replaceable> |

6
doc/src/sgml/ref/create_cast.sgml
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@ -19,7 +19,7 @@
<refsynopsisdiv>
<synopsis>
CREATE CAST (<replaceable>source_type</replaceable> AS <replaceable>target_type</replaceable>)
WITH FUNCTION <replaceable>function_name</replaceable> (<replaceable>argument_type</replaceable> [, ...])
WITH FUNCTION <replaceable>function_name</replaceable> [ (<replaceable>argument_type</replaceable> [, ...]) ]
[ AS ASSIGNMENT | AS IMPLICIT ]
CREATE CAST (<replaceable>source_type</replaceable> AS <replaceable>target_type</replaceable>)
@ -192,7 +192,7 @@ SELECT CAST ( 2 AS numeric ) + 4.0;
</varlistentry>
<varlistentry>
<term><replaceable>function_name</replaceable>(<replaceable>argument_type</replaceable> [, ...])</term>
<term><literal><replaceable>function_name</replaceable>[(<replaceable>argument_type</replaceable> [, ...])]</literal></term>
<listitem>
<para>
@ -200,6 +200,8 @@ SELECT CAST ( 2 AS numeric ) + 4.0;
be schema-qualified. If it is not, the function will be looked
up in the schema search path. The function's result data type must
match the target type of the cast. Its arguments are discussed below.
If no argument list is specified, the function name must be unique in
its schema.
</para>
</listitem>
</varlistentry>

12
doc/src/sgml/ref/create_transform.sgml
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@ -19,8 +19,8 @@
<refsynopsisdiv>
<synopsis>
CREATE [ OR REPLACE ] TRANSFORM FOR <replaceable>type_name</replaceable> LANGUAGE <replaceable>lang_name</replaceable> (
FROM SQL WITH FUNCTION <replaceable>from_sql_function_name</replaceable> (<replaceable>argument_type</replaceable> [, ...]),
TO SQL WITH FUNCTION <replaceable>to_sql_function_name</replaceable> (<replaceable>argument_type</replaceable> [, ...])
FROM SQL WITH FUNCTION <replaceable>from_sql_function_name</replaceable> [ (<replaceable>argument_type</replaceable> [, ...]) ],
TO SQL WITH FUNCTION <replaceable>to_sql_function_name</replaceable> [ (<replaceable>argument_type</replaceable> [, ...]) ]
);
</synopsis>
</refsynopsisdiv>
@ -104,7 +104,7 @@ CREATE [ OR REPLACE ] TRANSFORM FOR <replaceable>type_name</replaceable> LANGUAG
</varlistentry>
<varlistentry>
<term><replaceable>from_sql_function_name</replaceable>(<replaceable>argument_type</replaceable> [, ...])</term>
<term><literal><replaceable>from_sql_function_name</replaceable>[(<replaceable>argument_type</replaceable> [, ...])]</literal></term>
<listitem>
<para>
@ -116,12 +116,14 @@ CREATE [ OR REPLACE ] TRANSFORM FOR <replaceable>type_name</replaceable> LANGUAG
SQL-level function returning <type>internal</type> without at
least one argument of type <type>internal</type>.) The actual return
value will be something specific to the language implementation.
If no argument list is specified, the function name must be unique in
its schema.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable>to_sql_function_name</replaceable>(<replaceable>argument_type</replaceable> [, ...])</term>
<term><literal><replaceable>to_sql_function_name</replaceable>[(<replaceable>argument_type</replaceable> [, ...])]</literal></term>
<listitem>
<para>
@ -130,6 +132,8 @@ CREATE [ OR REPLACE ] TRANSFORM FOR <replaceable>type_name</replaceable> LANGUAG
<type>internal</type> and return the type that is the type for the
transform. The actual argument value will be something specific to the
language implementation.
If no argument list is specified, the function name must be unique in
its schema.
</para>
</listitem>
</varlistentry>

35
doc/src/sgml/ref/drop_function.sgml
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@ -21,7 +21,7 @@ PostgreSQL documentation
<refsynopsisdiv>
<synopsis>
DROP FUNCTION [ IF EXISTS ] <replaceable class="parameter">name</replaceable> ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] ) [, ...]
DROP FUNCTION [ IF EXISTS ] <replaceable class="parameter">name</replaceable> [ ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] ) ] [, ...]
[ CASCADE | RESTRICT ]
</synopsis>
</refsynopsisdiv>
@ -56,7 +56,8 @@ DROP FUNCTION [ IF EXISTS ] <replaceable class="parameter">name</replaceable> (
<term><replaceable class="parameter">name</replaceable></term>
<listitem>
<para>
The name (optionally schema-qualified) of an existing function.
The name (optionally schema-qualified) of an existing function. If no
argument list is specified, the name must be unique in its schema.
</para>
</listitem>
</varlistentry>
@ -141,14 +142,40 @@ DROP FUNCTION sqrt(integer);
<programlisting>
DROP FUNCTION sqrt(integer), sqrt(bigint);
</programlisting></para>
<para>
If the function name is unique in its schema, it can be referred to without
an argument list:
<programlisting>
DROP FUNCTION update_employee_salaries;
</programlisting>
Note that this is different from
<programlisting>
DROP FUNCTION update_employee_salaries();
</programlisting>
which refers to a function with zero arguments, whereas the first variant
can refer to a function with any number of arguments, including zero, as
long as the name is unique.
</para>
</refsect1>
<refsect1 id="SQL-DROPFUNCTION-compatibility">
<title>Compatibility</title>
<para>
A <command>DROP FUNCTION</command> statement is defined in the SQL
standard, but it is not compatible with this command.
This command conforms to the SQL standard, with
these <productname>PostgreSQL</productname> extensions:
<itemizedlist>
<listitem>
<para>The standard only allows one function to be dropped per command.</para>
</listitem>
<listitem>
<para>The <literal>IF EXISTS</literal> option</para>
</listitem>
<listitem>
<para>The ability to specify argument modes and names</para>
</listitem>
</itemizedlist>
</para>
</refsect1>

2
doc/src/sgml/ref/grant.sgml
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@ -55,7 +55,7 @@ GRANT { USAGE | ALL [ PRIVILEGES ] }
TO <replaceable class="PARAMETER">role_specification</replaceable> [, ...] [ WITH GRANT OPTION ]
GRANT { EXECUTE | ALL [ PRIVILEGES ] }
ON { FUNCTION <replaceable>function_name</replaceable> ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">arg_name</replaceable> ] <replaceable class="parameter">arg_type</replaceable> [, ...] ] ) [, ...]
ON { FUNCTION <replaceable>function_name</replaceable> [ ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">arg_name</replaceable> ] <replaceable class="parameter">arg_type</replaceable> [, ...] ] ) ] [, ...]
| ALL FUNCTIONS IN SCHEMA <replaceable class="PARAMETER">schema_name</replaceable> [, ...] }
TO <replaceable class="PARAMETER">role_specification</replaceable> [, ...] [ WITH GRANT OPTION ]

2
doc/src/sgml/ref/revoke.sgml
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@ -70,7 +70,7 @@ REVOKE [ GRANT OPTION FOR ]
REVOKE [ GRANT OPTION FOR ]
{ EXECUTE | ALL [ PRIVILEGES ] }
ON { FUNCTION <replaceable>function_name</replaceable> ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">arg_name</replaceable> ] <replaceable class="parameter">arg_type</replaceable> [, ...] ] ) [, ...]
ON { FUNCTION <replaceable>function_name</replaceable> [ ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">arg_name</replaceable> ] <replaceable class="parameter">arg_type</replaceable> [, ...] ] ) ] [, ...]
| ALL FUNCTIONS IN SCHEMA <replaceable>schema_name</replaceable> [, ...] }
FROM { [ GROUP ] <replaceable class="PARAMETER">role_name</replaceable> | PUBLIC } [, ...]
[ CASCADE | RESTRICT ]

2
doc/src/sgml/ref/security_label.sgml
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@ -30,7 +30,7 @@ SECURITY LABEL [ FOR <replaceable class="PARAMETER">provider</replaceable> ] ON
DOMAIN <replaceable class="PARAMETER">object_name</replaceable> |
EVENT TRIGGER <replaceable class="PARAMETER">object_name</replaceable> |
FOREIGN TABLE <replaceable class="PARAMETER">object_name</replaceable>
FUNCTION <replaceable class="PARAMETER">function_name</replaceable> ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] ) |
FUNCTION <replaceable class="PARAMETER">function_name</replaceable> [ ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] ) ] |
LARGE OBJECT <replaceable class="PARAMETER">large_object_oid</replaceable> |
MATERIALIZED VIEW <replaceable class="PARAMETER">object_name</replaceable> |
[ PROCEDURAL ] LANGUAGE <replaceable class="PARAMETER">object_name</replaceable> |