/*-------------------------------------------------------------------------
 *
 * skey.h--
 *    POSTGRES scan key definitions.
 *
 *
 * Copyright (c) 1994, Regents of the University of California
 *
 * $Id: skey.h,v 1.3 1995/02/12 09:11:36 andrew Exp $
 *
 *
 * Note:
 *	Needs more accessor/assignment routines.
 *-------------------------------------------------------------------------
 */
#ifndef	SKEY_H
#define SKEY_H

#include "postgres.h"
#include "access/attnum.h"


typedef struct ScanKeyData {
    bits16		sk_flags;	/* flags */
    AttrNumber		sk_attno;	/* domain number */
    RegProcedure	sk_procedure;	/* procedure OID */
    func_ptr            sk_func;
    int32 		sk_nargs;
    Datum		sk_argument;	/* data to compare */
} ScanKeyData;

typedef ScanKeyData	*ScanKey;


#define	SK_ISNULL	0x1
#define	SK_UNARY	0x2
#define	SK_NEGATE	0x4
#define	SK_COMMUTE	0x8

#define ScanUnmarked		0x01
#define ScanUncheckedPrevious	0x02
#define ScanUncheckedNext	0x04


/*
 * prototypes for functions in access/common/scankey.c
 */
extern void ScanKeyEntrySetIllegal(ScanKey entry);
extern void ScanKeyEntryInitialize(ScanKey entry, bits16 flags,
     AttrNumber attributeNumber, RegProcedure procedure, Datum argument);

#endif	/* SKEY_H */