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/*-------------------------------------------------------------------------
*
* skey.h
* POSTGRES scan key definitions.
*
*
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: skey.h,v 1.21 2002/06/20 20:29:43 momjian Exp $
*
* Note:
* Needs more accessor/assignment routines.
*-------------------------------------------------------------------------
*/
#ifndef SKEY_H
#define SKEY_H
#include "access/attnum.h"
#include "fmgr.h"
typedef struct ScanKeyData
{
bits16 sk_flags; /* flags */
AttrNumber sk_attno; /* domain number */
RegProcedure sk_procedure; /* procedure OID */
FmgrInfo sk_func; /* fmgr call info for procedure */
Datum sk_argument; /* data to compare */
} ScanKeyData;
typedef ScanKeyData *ScanKey;
/* ScanKeyData flags */
#define SK_ISNULL 0x1 /* sk_argument is NULL */
#define SK_UNARY 0x2 /* unary function (currently unsupported) */
#define SK_NEGATE 0x4 /* negate function result */
#define SK_COMMUTE 0x8 /* commute function (not fully supported) */
/*
* 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);
extern void ScanKeyEntryInitializeWithInfo(ScanKey entry, bits16 flags,
AttrNumber attributeNumber, FmgrInfo *finfo,
MemoryContext mcxt, Datum argument);
#endif /* SKEY_H */
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