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diff --git a/src/backend/nodes/params.h b/src/backend/nodes/params.h
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+/*-------------------------------------------------------------------------
+ *
+ * params.h--
+ *    Declarations/definitions of stuff needed to handle parameterized plans.
+ *
+ *
+ * Copyright (c) 1994, Regents of the University of California
+ *
+ * $Id: params.h,v 1.1.1.1 1996/07/09 06:21:33 scrappy Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PARAMS_H
+#define PARAMS_H
+
+#include "postgres.h"
+#include "access/attnum.h"
+
+/* ----------------------------------------------------------------
+ *
+ * The following are the possible values for the 'paramkind'
+ * field of a Param node.
+ *    
+ * PARAM_NAMED: The parameter has a name, i.e. something
+ *              like `$.salary' or `$.foobar'.
+ *              In this case field `paramname' must be a valid Name.
+ *              and field `paramid' must be == 0.
+ *
+ * PARAM_NUM:   The parameter has only a numeric identifier,
+ *              i.e. something like `$1', `$2' etc.
+ *              The number is contained in the `parmid' field.
+ *
+ * PARAM_NEW:   Used in PRS2 rule, similar to PARAM_NAMED.
+ *              The `paramname' & `paramid' refer to the "NEW" tuple
+ *		`paramname' is the attribute name and `paramid' its
+ *		attribute number.
+ *              
+ * PARAM_OLD:   Same as PARAM_NEW, but in this case we refer to
+ *		the "OLD" tuple.
+ */
+
+#define PARAM_NAMED	11
+#define PARAM_NUM	12
+#define PARAM_NEW	13
+#define PARAM_OLD	14
+#define PARAM_INVALID   100
+
+
+/* ----------------------------------------------------------------
+ *    ParamListInfo
+ *
+ *    Information needed in order for the executor to handle
+ *    parameterized plans (you know,  $.salary, $.name etc. stuff...).
+ *
+ *    ParamListInfoData contains information needed when substituting a
+ *    Param node with a Const node.
+ *
+ *	kind   : the kind of parameter.
+ *      name   : the parameter name (valid if kind == PARAM_NAMED,
+ *               PARAM_NEW or PARAM_OLD)
+ *      id     : the parameter id (valid if kind == PARAM_NUM)
+ *		 or the attrno (if kind == PARAM_NEW or PARAM_OLD)
+ *      type   : PG_TYPE OID of the value
+ *      length : length in bytes of the value
+ *      isnull : true if & only if the value is null (if true then
+ *               the fields 'length' and 'value' are undefined).
+ *      value  : the value that has to be substituted in the place
+ *               of the parameter.
+ *
+ *   ParamListInfo is to be used as an array of ParamListInfoData
+ *   records. An 'InvalidName' in the name field of such a record
+ *   indicates that this is the last record in the array.
+ *
+ * ----------------------------------------------------------------
+ */
+
+typedef struct ParamListInfoData {
+    int			kind;
+    char 		*name;
+    AttrNumber		id;
+    Oid			type;
+    Size		length;
+    bool		isnull;
+    bool		byval;
+    Datum		value;
+} ParamListInfoData;
+
+typedef ParamListInfoData *ParamListInfo;
+
+#endif	/* PARAMS_H */