Print error on SELECT tab FROM tab:

You can't use relation names alone in the target list, try relation.*

src/include/nodes/parsenodes.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: parsenodes.h,v 1.128 2001/05/20 20:28:20 tgl Exp $
+ * $Id: parsenodes.h,v 1.129 2001/05/21 18:42:08 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1081,8 +1081,7 @@ typedef struct Ident
 	NodeTag		type;
 	char	   *name;			/* its name */
 	List	   *indirection;	/* array references */
-	bool		isRel;			/* is a relation - filled in by
-								 * transformExpr() */
+	bool		isRel;			/* is this a relation or a column? */
 } Ident;
 
 /*