Change Constraint structure to be a full node structure.

Add new constraint types PRIMARY, UNIQUE.

src/include/nodes/parsenodes.h

@@ -6,7 +6,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: parsenodes.h,v 1.36 1997/12/04 00:28:03 scrappy Exp $
+ * $Id: parsenodes.h,v 1.37 1997/12/04 23:55:52 thomas Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -82,7 +82,7 @@ typedef struct AddAttrStmt
 	NodeTag		type;
 	char	   *relname;		/* the relation to add attr */
 	bool		inh;			/* add recursively to children? */
-	struct ColumnDef *colDef;	/* the attribute definition */
+	Node	   *colDef;			/* the attribute definition */
 } AddAttrStmt;
 
 /* ----------------------
@@ -130,23 +130,25 @@ typedef struct CreateStmt
 {
 	NodeTag		type;
 	char	   *relname;		/* the relation to create */
-	List	   *tableElts;		/* column definitions list of ColumnDef */
+	List	   *tableElts;		/* column definitions list of Column */
 	List	   *inhRelnames;	/* relations to inherit from list of Value
 								 * (string) */
 	List	   *constraints;	/* list of constraints (ConstaintDef) */
 } CreateStmt;
 
-typedef enum ConstrType
+typedef enum ConstrType			/* type of constaints */
 {
-	CONSTR_NONE, CONSTR_CHECK	/* type of constaints */
+	CONSTR_NONE, CONSTR_NOTNULL, CONSTR_DEFAULT, CONSTR_CHECK, CONSTR_PRIMARY, CONSTR_UNIQUE
 } ConstrType;
 
-typedef struct ConstraintDef
+typedef struct Constraint
 {
-	ConstrType	type;
+	NodeTag		type;
+	ConstrType	contype;
 	char	   *name;			/* name */
 	void	   *def;			/* definition */
-}			ConstraintDef;
+	void	   *keys;			/* list of primary keys */
+} Constraint;
 
 /* ----------------------
  *		Create/Drop TRIGGER Statements
@@ -725,6 +727,7 @@ typedef struct ColumnDef
 	TypeName   *typename;		/* type of column */
 	bool		is_not_null;	/* flag to NOT NULL constraint */
 	char	   *defval;			/* default value of column */
+	List	   *constraints;	/* constraints on column */
 } ColumnDef;
 
 /*