Update documentation for pg_get_serial_sequence() function.

doc/src/sgml/func.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.353 2007/01/29 13:24:30 petere Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.354 2007/01/30 02:39:27 momjian Exp $ -->
 
  <chapter id="functions">
   <title>Functions and Operators</title>
@@ -9892,12 +9892,18 @@ SELECT pg_type_is_visible('myschema.widget'::regtype);
   </para>
 
   <para>
-   <function>pg_get_serial_sequence</function> fetches the name of the
-   sequence associated with a column, or NULL if there is no sequence
-   associated with the column.  The result is suitably formatted for passing
-   to the sequence functions (see <xref linkend="functions-sequence">).
-   This association can be modified or removed with <command>ALTER SEQUENCE
-   OWNED BY</>.  (The function probably should have been called
+   <function>pg_get_serial_sequence</function> returns the name of the
+   sequence associated with a column, or NULL if no sequence is associated
+   with the column.  The first input parameter is a table name with
+   optional schema, and the second parameter is a column name.  Because
+   the first parameter is potentially a schema and table, it is not treated
+   as a double-quoted identifier, meaning it is lowercased by default,
+   while the second parameter, being just a column name, is treated as
+   double-quoted and has its case preserved.  The function returns a value
+   suitably formatted for passing to the sequence functions (see <xref
+   linkend="functions-sequence">).  This association can be modified or
+   removed with <command>ALTER SEQUENCE OWNED BY</>.  (The function
+   probably should have been called
    <function>pg_get_owned_sequence</function>; its name reflects the fact
    that it's typically used with <type>serial</> or <type>bigserial</>
    columns.)

src/backend/utils/adt/ruleutils.c

@@ -9,7 +9,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/adt/ruleutils.c,v 1.246 2007/01/25 04:17:46 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/adt/ruleutils.c,v 1.247 2007/01/30 02:39:27 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1265,6 +1265,8 @@ pg_get_userbyid(PG_FUNCTION_ARGS)
  * pg_get_serial_sequence
  *		Get the name of the sequence used by a serial column,
  *		formatted suitably for passing to setval, nextval or currval.
+ *		First parameter is not treated as double-quoted, second parameter
+ *		is --- see documentation for reason.
  */
 Datum
 pg_get_serial_sequence(PG_FUNCTION_ARGS)