New SubPlan node for subselects.

New PARAM_EXEC type.

src/include/nodes/params.h

@@ -6,7 +6,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: params.h,v 1.6 1997/09/08 21:52:48 momjian Exp $
+ * $Id: params.h,v 1.7 1998/02/13 03:45:24 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -36,12 +36,16 @@
  *
  * PARAM_OLD:	Same as PARAM_NEW, but in this case we refer to
  *				the "OLD" tuple.
+ *
+ * PARAM_EXEC:	Evaluated by executor. Used for subselect...
+ *
  */
 
 #define PARAM_NAMED		11
 #define PARAM_NUM		12
 #define PARAM_NEW		13
 #define PARAM_OLD		14
+#define	PARAM_EXEC		15
 #define PARAM_INVALID	100
 
 
@@ -87,4 +91,11 @@ typedef struct ParamListInfoData
 
 typedef ParamListInfoData *ParamListInfo;
 
+typedef struct ParamExecData
+{
+	void	   *execPlan;		/* plan must be executed to get param value */
+	Datum		value;
+	bool		isnull;
+} ParamExecData;
+
 #endif							/* PARAMS_H */