Make argument names of pg_get_object_address consistent, and fix docs.

pg_get_object_address and pg_identify_object_as_address are supposed
to be inverses, but they disagreed as to the names of the arguments
representing the textual form of an object address.  Moreover, the
documented argument names didn't agree with reality at all, either
for these functions or pg_identify_object.

In HEAD and v11, I think we can get away with renaming the input
arguments of pg_get_object_address to match the outputs of
pg_identify_object_as_address.  In theory that might break queries
using named-argument notation to call pg_get_object_address, but
it seems really unlikely that anybody is doing that, or that they'd
have much trouble adjusting if they were.  In older branches, we'll
just live with the lack of consistency.

Aside from fixing the documentation of these functions to match reality,
I couldn't resist the temptation to do some copy-editing.

Per complaint from Jean-Pierre Pelletier.  Back-patch to 9.5 where these
functions were introduced.  (Before v11, this is a documentation change
only.)

Discussion: https://postgr.es/m/CANGqjDnWH8wsTY_GzDUxbt4i=y-85SJreZin4Hm8uOqv1vzRQA@mail.gmail.com

Author: tglsfdc

doc/src/sgml/func.sgml

@@ -17700,32 +17700,34 @@ SELECT collation for ('foo' COLLATE "de_DE");
 
      <tbody>
       <row>
-       <entry><literal><function>pg_describe_object(<parameter>catalog_id</parameter>, <parameter>object_id</parameter>, <parameter>object_sub_id</parameter>)</function></literal></entry>
+       <entry><literal><function>pg_describe_object(<parameter>classid</parameter> <type>oid</type>, <parameter>objid</parameter> <type>oid</type>, <parameter>objsubid</parameter> <type>integer</type>)</function></literal></entry>
        <entry><type>text</type></entry>
        <entry>get description of a database object</entry>
       </row>
       <row>
-       <entry><literal><function>pg_identify_object(<parameter>catalog_id</parameter> <type>oid</type>, <parameter>object_id</parameter> <type>oid</type>, <parameter>object_sub_id</parameter> <type>integer</type>)</function></literal></entry>
+       <entry><literal><function>pg_identify_object(<parameter>classid</parameter> <type>oid</type>, <parameter>objid</parameter> <type>oid</type>, <parameter>objsubid</parameter> <type>integer</type>)</function></literal></entry>
        <entry><parameter>type</parameter> <type>text</type>, <parameter>schema</parameter> <type>text</type>, <parameter>name</parameter> <type>text</type>, <parameter>identity</parameter> <type>text</type></entry>
        <entry>get identity of a database object</entry>
       </row>
       <row>
-       <entry><literal><function>pg_identify_object_as_address(<parameter>catalog_id</parameter> <type>oid</type>, <parameter>object_id</parameter> <type>oid</type>, <parameter>object_sub_id</parameter> <type>integer</type>)</function></literal></entry>
-       <entry><parameter>type</parameter> <type>text</type>, <parameter>name</parameter> <type>text[]</type>, <parameter>args</parameter> <type>text[]</type></entry>
+       <entry><literal><function>pg_identify_object_as_address(<parameter>classid</parameter> <type>oid</type>, <parameter>objid</parameter> <type>oid</type>, <parameter>objsubid</parameter> <type>integer</type>)</function></literal></entry>
+       <entry><parameter>type</parameter> <type>text</type>, <parameter>object_names</parameter> <type>text[]</type>, <parameter>object_args</parameter> <type>text[]</type></entry>
        <entry>get external representation of a database object's address</entry>
       </row>
       <row>
-       <entry><literal><function>pg_get_object_address(<parameter>type</parameter> <type>text</type>, <parameter>name</parameter> <type>text[]</type>, <parameter>args</parameter> <type>text[]</type>)</function></literal></entry>
-       <entry><parameter>catalog_id</parameter> <type>oid</type>, <parameter>object_id</parameter> <type>oid</type>, <parameter>object_sub_id</parameter> <type>int32</type></entry>
-       <entry>get address of a database object, from its external representation</entry>
+       <entry><literal><function>pg_get_object_address(<parameter>type</parameter> <type>text</type>, <parameter>object_names</parameter> <type>text[]</type>, <parameter>object_args</parameter> <type>text[]</type>)</function></literal></entry>
+       <entry><parameter>classid</parameter> <type>oid</type>, <parameter>objid</parameter> <type>oid</type>, <parameter>objsubid</parameter> <type>integer</type></entry>
+       <entry>get address of a database object from its external representation</entry>
       </row>
      </tbody>
     </tgroup>
    </table>
 
   <para>
    <function>pg_describe_object</function> returns a textual description of a database
-   object specified by catalog OID, object OID and a (possibly zero) sub-object ID.
+   object specified by catalog OID, object OID, and sub-object ID (such as
+   a column number within a table; the sub-object ID is zero when referring
+   to a whole object).
    This description is intended to be human-readable, and might be translated,
    depending on server configuration.
    This is useful to determine the identity of an object as stored in the
@@ -17734,29 +17736,30 @@ SELECT collation for ('foo' COLLATE "de_DE");
 
   <para>
    <function>pg_identify_object</function> returns a row containing enough information
-   to uniquely identify the database object specified by catalog OID, object OID and a
-   (possibly zero) sub-object ID.  This information is intended to be machine-readable,
+   to uniquely identify the database object specified by catalog OID, object OID and
+   sub-object ID.  This information is intended to be machine-readable,
    and is never translated.
    <parameter>type</parameter> identifies the type of database object;
    <parameter>schema</parameter> is the schema name that the object belongs in, or
    <literal>NULL</literal> for object types that do not belong to schemas;
-   <parameter>name</parameter> is the name of the object, quoted if necessary, only
-   present if it can be used (alongside schema name, if pertinent) as a unique
-   identifier of the object, otherwise <literal>NULL</literal>;
-   <parameter>identity</parameter> is the complete object identity, with the precise format
-   depending on object type, and each part within the format being
-   schema-qualified and quoted as necessary.
+   <parameter>name</parameter> is the name of the object, quoted if necessary,
+   if the name (along with schema name, if pertinent) is sufficient to
+   uniquely identify the object, otherwise <literal>NULL</literal>;
+   <parameter>identity</parameter> is the complete object identity, with the
+   precise format depending on object type, and each name within the format
+   being schema-qualified and quoted as necessary.
   </para>
 
   <para>
    <function>pg_identify_object_as_address</function> returns a row containing
    enough information to uniquely identify the database object specified by
-   catalog OID, object OID and a (possibly zero) sub-object ID.  The returned
+   catalog OID, object OID and sub-object ID.  The returned
    information is independent of the current server, that is, it could be used
    to identify an identically named object in another server.
    <parameter>type</parameter> identifies the type of database object;
-   <parameter>name</parameter> and <parameter>args</parameter> are text arrays that together
-   form a reference to the object.  These three columns can be passed to
+   <parameter>object_names</parameter> and <parameter>object_args</parameter>
+   are text arrays that together form a reference to the object.
+   These three values can be passed to
    <function>pg_get_object_address</function> to obtain the internal address
    of the object.
    This function is the inverse of <function>pg_get_object_address</function>.
@@ -17769,10 +17772,10 @@ SELECT collation for ('foo' COLLATE "de_DE");
    ones that would be used in system catalogs such as <structname>pg_depend</structname>
    and can be passed to other system functions such as
    <function>pg_identify_object</function> or <function>pg_describe_object</function>.
-   <parameter>catalog_id</parameter> is the OID of the system catalog containing the
+   <parameter>classid</parameter> is the OID of the system catalog containing the
    object;
-   <parameter>object_id</parameter> is the OID of the object itself, and
-   <parameter>object_sub_id</parameter> is the object sub-ID, or zero if none.
+   <parameter>objid</parameter> is the OID of the object itself, and
+   <parameter>objsubid</parameter> is the sub-object ID, or zero if none.
    This function is the inverse of <function>pg_identify_object_as_address</function>.
   </para>
 
@@ -20661,23 +20664,23 @@ FOR EACH ROW EXECUTE FUNCTION suppress_redundant_updates_trigger();
       <tbody>
        <row>
         <entry><literal>classid</literal></entry>
-        <entry><type>Oid</type></entry>
+        <entry><type>oid</type></entry>
         <entry>OID of catalog the object belongs in</entry>
        </row>
        <row>
         <entry><literal>objid</literal></entry>
-        <entry><type>Oid</type></entry>
-        <entry>OID of the object in the catalog</entry>
+        <entry><type>oid</type></entry>
+        <entry>OID of the object itself</entry>
        </row>
        <row>
         <entry><literal>objsubid</literal></entry>
         <entry><type>integer</type></entry>
-        <entry>Object sub-id (e.g. attribute number for columns)</entry>
+        <entry>Sub-object ID (e.g. attribute number for a column)</entry>
        </row>
        <row>
         <entry><literal>command_tag</literal></entry>
         <entry><type>text</type></entry>
-        <entry>command tag</entry>
+        <entry>Command tag</entry>
        </row>
        <row>
         <entry><literal>object_type</literal></entry>
@@ -20696,14 +20699,14 @@ FOR EACH ROW EXECUTE FUNCTION suppress_redundant_updates_trigger();
         <entry><literal>object_identity</literal></entry>
         <entry><type>text</type></entry>
         <entry>
-         Text rendering of the object identity, schema-qualified. Each and every
-         identifier present in the identity is quoted if necessary.
+         Text rendering of the object identity, schema-qualified. Each
+         identifier included in the identity is quoted if necessary.
         </entry>
        </row>
        <row>
         <entry><literal>in_extension</literal></entry>
         <entry><type>bool</type></entry>
-        <entry>whether the command is part of an extension script</entry>
+        <entry>True if the command is part of an extension script</entry>
        </row>
        <row>
         <entry><literal>command</literal></entry>
@@ -20748,37 +20751,37 @@ FOR EACH ROW EXECUTE FUNCTION suppress_redundant_updates_trigger();
       <tbody>
        <row>
         <entry><literal>classid</literal></entry>
-        <entry><type>Oid</type></entry>
+        <entry><type>oid</type></entry>
         <entry>OID of catalog the object belonged in</entry>
        </row>
        <row>
         <entry><literal>objid</literal></entry>
-        <entry><type>Oid</type></entry>
-        <entry>OID the object had within the catalog</entry>
+        <entry><type>oid</type></entry>
+        <entry>OID of the object itself</entry>
        </row>
        <row>
         <entry><literal>objsubid</literal></entry>
-        <entry><type>int32</type></entry>
-        <entry>Object sub-id (e.g. attribute number for columns)</entry>
+        <entry><type>integer</type></entry>
+        <entry>Sub-object ID (e.g. attribute number for a column)</entry>
        </row>
        <row>
         <entry><literal>original</literal></entry>
         <entry><type>bool</type></entry>
-        <entry>Flag used to identify the root object(s) of the deletion</entry>
+        <entry>True if this was one of the root object(s) of the deletion</entry>
        </row>
        <row>
         <entry><literal>normal</literal></entry>
         <entry><type>bool</type></entry>
         <entry>
-         Flag indicating that there's a normal dependency relationship
+         True if there was a normal dependency relationship
          in the dependency graph leading to this object
         </entry>
        </row>
        <row>
         <entry><literal>is_temporary</literal></entry>
         <entry><type>bool</type></entry>
         <entry>
-         Flag indicating that the object was a temporary object.
+         True if this was a temporary object
         </entry>
        </row>
        <row>
@@ -20807,26 +20810,26 @@ FOR EACH ROW EXECUTE FUNCTION suppress_redundant_updates_trigger();
         <entry><literal>object_identity</literal></entry>
         <entry><type>text</type></entry>
         <entry>
-         Text rendering of the object identity, schema-qualified. Each and every
-         identifier present in the identity is quoted if necessary.
+         Text rendering of the object identity, schema-qualified. Each
+         identifier included in the identity is quoted if necessary.
         </entry>
        </row>
        <row>
         <entry><literal>address_names</literal></entry>
         <entry><type>text[]</type></entry>
         <entry>
          An array that, together with <literal>object_type</literal> and
-         <literal>address_args</literal>,
-         can be used by the <function>pg_get_object_address()</function> to
+         <literal>address_args</literal>, can be used by
+         the <function>pg_get_object_address()</function> function to
          recreate the object address in a remote server containing an
-         identically named object of the same kind.
+         identically named object of the same kind
         </entry>
        </row>
        <row>
         <entry><literal>address_args</literal></entry>
         <entry><type>text[]</type></entry>
         <entry>
-         Complement for <literal>address_names</literal> above.
+         Complement for <literal>address_names</literal>
         </entry>
        </row>
       </tbody>

src/include/catalog/catversion.h

@@ -53,6 +53,6 @@
  */
 
 /*							yyyymmddN */
-#define CATALOG_VERSION_NO	201809042
+#define CATALOG_VERSION_NO	201809052
 
 #endif

src/include/catalog/pg_proc.dat

@@ -5907,7 +5907,7 @@
   prorettype => 'record', proargtypes => 'text _text _text',
   proallargtypes => '{text,_text,_text,oid,oid,int4}',
   proargmodes => '{i,i,i,o,o,o}',
-  proargnames => '{type,name,args,classid,objid,objsubid}',
+  proargnames => '{type,object_names,object_args,classid,objid,objsubid}',
   prosrc => 'pg_get_object_address' },
 
 { oid => '2079', descr => 'is table visible in search path?',