Creates the SubLink structure, and the Query->hasSubLink field,

with supporting code.

Creates SubLink node in gram.y.

psql.c patch for newatttypmod field.

src/include/nodes/parsenodes.h

@@ -6,7 +6,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: parsenodes.h,v 1.45 1998/01/16 23:20:55 momjian Exp $
+ * $Id: parsenodes.h,v 1.46 1998/01/17 04:53:40 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -45,6 +45,7 @@ typedef struct Query
 	bool		isBinary;		/* binary portal? */
 	bool		unionall;		/* union without unique sort */
 	bool		hasAggs;		/* has aggregates in target list */
+	bool		hasSubLinks;	/* has subquery SubLink */
 	
 	char	   *uniqueFlag;		/* NULL, '*', or Unique attribute name */
 	List	   *sortClause;		/* a list of SortClause's */