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/*-------------------------------------------------------------------------
*
* relscan.h
* POSTGRES internal relation scan descriptor definitions.
*
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: relscan.h,v 1.25 2001/11/05 17:46:31 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef RELSCAN_H
#define RELSCAN_H
#include "utils/tqual.h"
typedef struct HeapScanDescData
{
Relation rs_rd; /* pointer to relation descriptor */
HeapTupleData rs_ctup; /* current tuple in scan, if any */
Buffer rs_cbuf; /* current buffer in scan, if any */
/* NB: if rs_cbuf is not InvalidBuffer, we hold a pin on that buffer */
ItemPointerData rs_mctid; /* marked tid, if any */
Snapshot rs_snapshot; /* snapshot to see */
uint16 rs_nkeys; /* number of scan keys to select tuples */
ScanKey rs_key; /* key descriptors */
PgStat_Info rs_pgstat_info; /* statistics collector hook */
} HeapScanDescData;
typedef HeapScanDescData *HeapScanDesc;
typedef struct IndexScanDescData
{
Relation relation; /* relation descriptor */
void *opaque; /* access-method-specific info */
ItemPointerData currentItemData; /* current index pointer */
ItemPointerData currentMarkData; /* marked current pointer */
uint8 flags; /* scan position flags */
bool scanFromEnd; /* restart scan at end? */
uint16 numberOfKeys; /* number of scan keys to select tuples */
ScanKey keyData; /* key descriptors */
FmgrInfo fn_getnext; /* cached lookup info for am's getnext fn */
PgStat_Info xs_pgstat_info; /* statistics collector hook */
} IndexScanDescData;
typedef IndexScanDescData *IndexScanDesc;
/* IndexScanDesc flag bits (none of these are actually used currently) */
#define ScanUnmarked 0x01
#define ScanUncheckedPrevious 0x02
#define ScanUncheckedNext 0x04
/* ----------------
* 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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