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/*-------------------------------------------------------------------------
*
* relscan.h--
* POSTGRES internal relation scan descriptor definitions.
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: relscan.h,v 1.6 1997/09/07 04:56:08 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef RELSCAN_H
#define RELSCAN_H
#include <utils/tqual.h>
#include <storage/buf.h>
#include <utils/rel.h>
typedef ItemPointerData MarkData;
typedef struct HeapScanDescData
{
Relation rs_rd; /* pointer to relation descriptor */
HeapTuple rs_ptup; /* previous tuple in scan */
HeapTuple rs_ctup; /* current tuple in scan */
HeapTuple rs_ntup; /* next tuple in scan */
Buffer rs_pbuf; /* previous buffer in scan */
Buffer rs_cbuf; /* current buffer in scan */
Buffer rs_nbuf; /* next buffer in scan */
ItemPointerData rs_mptid; /* marked previous tid */
ItemPointerData rs_mctid; /* marked current tid */
ItemPointerData rs_mntid; /* marked next tid */
ItemPointerData rs_mcd; /* marked current delta XXX ??? */
bool rs_atend; /* restart scan at end? */
TimeQual rs_tr; /* time qualification */
uint16 rs_cdelta; /* current delta in chain */
uint16 rs_nkeys; /* number of attributes in keys */
ScanKey rs_key; /* key descriptors */
} HeapScanDescData;
typedef HeapScanDescData *HeapScanDesc;
typedef struct IndexScanDescData
{
Relation relation; /* relation descriptor */
void *opaque; /* am-specific slot */
ItemPointerData previousItemData; /* previous index pointer */
ItemPointerData currentItemData; /* current index pointer */
ItemPointerData nextItemData; /* next index pointer */
MarkData previousMarkData; /* marked previous pointer */
MarkData currentMarkData; /* marked current pointer */
MarkData nextMarkData; /* marked next pointer */
uint8 flags; /* scan position flags */
bool scanFromEnd;/* restart scan at end? */
uint16 numberOfKeys; /* number of key attributes */
ScanKey keyData; /* key descriptor */
} IndexScanDescData;
typedef IndexScanDescData *IndexScanDesc;
/* ----------------
* IndexScanDescPtr is used in the executor where we have to
* keep track of several index scans when using several indices
* - cim 9/10/89
* ----------------
*/
typedef IndexScanDesc *IndexScanDescPtr;
/*
* HeapScanIsValid --
* True iff the heap scan is valid.
*/
#define HeapScanIsValid(scan) PointerIsValid(scan)
/*
* IndexScanIsValid --
* True iff the index scan is valid.
*/
#define IndexScanIsValid(scan) PointerIsValid(scan)
#endif /* RELSCAN_H */
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