Allow ALTER FUNCTION to change a function's strictness, volatility, and

whether or not it is a security definer. Changing a function's strictness
is required by SQL2003, and the other capabilities make sense. Also, allow
an optional RESTRICT noise word to be specified, for SQL conformance.

Some trivial regression tests added and the documentation has been
updated.

src/include/nodes/parsenodes.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.273 2005/03/10 23:21:24 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.274 2005/03/14 00:19:37 neilc Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1397,6 +1397,13 @@ typedef struct FunctionParameter
 	/* someday add IN/OUT/INOUT indicator here */
 } FunctionParameter;
 
+typedef struct AlterFunctionStmt
+{
+	NodeTag		type;
+	FuncWithArgs *func;			/* name and args of function */
+	List	   *actions;		/* list of DefElem */
+} AlterFunctionStmt;
+
 /* ----------------------
  *		Drop Aggregate Statement
  * ----------------------