Since SQL:2003, the array size specification in the SQL ARRAY syntax has

been optional.

doc/src/sgml/array.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/array.sgml,v 1.66 2008/04/28 14:48:57 alvherre Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/array.sgml,v 1.67 2008/10/29 11:24:52 petere Exp $ -->
 
 <sect1 id="arrays">
  <title>Arrays</title>
@@ -76,9 +76,12 @@ CREATE TABLE tictactoe (
 <programlisting>
     pay_by_quarter  integer ARRAY[4],
 </programlisting>
-  This syntax requires an integer constant to denote the array size.
+  Or, if no array size is to be specified:
+<programlisting>
+    pay_by_quarter  integer ARRAY,
+</programlisting>
   As before, however, <productname>PostgreSQL</> does not enforce the
-  size restriction.
+  size restriction in any case.
  </para>
  </sect2>
 

src/backend/parser/gram.y

@@ -11,7 +11,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.631 2008/10/28 14:09:45 petere Exp $
+ *	  $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.632 2008/10/29 11:24:53 petere Exp $
  *
  * HISTORY
  *	  AUTHOR			DATE			MAJOR EVENT
@@ -7124,19 +7124,29 @@ Typename:	SimpleTypename opt_array_bounds
 					$$->arrayBounds = $3;
 					$$->setof = TRUE;
 				}
+			/* SQL standard syntax, currently only one-dimensional */
 			| SimpleTypename ARRAY '[' Iconst ']'
 				{
-					/* SQL99's redundant syntax */
 					$$ = $1;
 					$$->arrayBounds = list_make1(makeInteger($4));
 				}
 			| SETOF SimpleTypename ARRAY '[' Iconst ']'
 				{
-					/* SQL99's redundant syntax */
 					$$ = $2;
 					$$->arrayBounds = list_make1(makeInteger($5));
 					$$->setof = TRUE;
 				}
+			| SimpleTypename ARRAY
+				{
+					$$ = $1;
+					$$->arrayBounds = list_make1(makeInteger(-1));
+				}
+			| SETOF SimpleTypename ARRAY
+				{
+					$$ = $2;
+					$$->arrayBounds = list_make1(makeInteger(-1));
+					$$->setof = TRUE;
+				}
 		;
 
 opt_array_bounds: