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/*-------------------------------------------------------------------------
*
* heapam.h
* POSTGRES heap access method definitions.
*
*
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/heapam.h,v 1.86 2003/11/29 22:40:55 pgsql Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef HEAPAM_H
#define HEAPAM_H
#include "access/htup.h"
#include "access/relscan.h"
#include "access/sdir.h"
#include "access/tupmacs.h"
#include "access/xlogutils.h"
#include "nodes/primnodes.h"
#include "storage/block.h"
#include "storage/lmgr.h"
#include "utils/rel.h"
#include "utils/tqual.h"
/* ----------------
* fastgetattr
*
* Fetch a user attribute's value as a Datum (might be either a
* value, or a pointer into the data area of the tuple).
*
* This must not be used when a system attribute might be requested.
* Furthermore, the passed attnum MUST be valid. Use heap_getattr()
* instead, if in doubt.
*
* This gets called many times, so we macro the cacheable and NULL
* lookups, and call nocachegetattr() for the rest.
* ----------------
*/
extern Datum nocachegetattr(HeapTuple tup, int attnum,
TupleDesc att, bool *isnull);
#if !defined(DISABLE_COMPLEX_MACRO)
#define fastgetattr(tup, attnum, tupleDesc, isnull) \
( \
AssertMacro((attnum) > 0), \
((isnull) ? (*(isnull) = false) : (dummyret)NULL), \
HeapTupleNoNulls(tup) ? \
( \
(tupleDesc)->attrs[(attnum)-1]->attcacheoff >= 0 ? \
( \
fetchatt((tupleDesc)->attrs[(attnum)-1], \
(char *) (tup)->t_data + (tup)->t_data->t_hoff + \
(tupleDesc)->attrs[(attnum)-1]->attcacheoff) \
) \
: \
nocachegetattr((tup), (attnum), (tupleDesc), (isnull)) \
) \
: \
( \
att_isnull((attnum)-1, (tup)->t_data->t_bits) ? \
( \
((isnull) ? (*(isnull) = true) : (dummyret)NULL), \
(Datum)NULL \
) \
: \
( \
nocachegetattr((tup), (attnum), (tupleDesc), (isnull)) \
) \
) \
)
#else /* defined(DISABLE_COMPLEX_MACRO) */
extern Datum fastgetattr(HeapTuple tup, int attnum, TupleDesc tupleDesc,
bool *isnull);
#endif /* defined(DISABLE_COMPLEX_MACRO) */
/* ----------------
* heap_getattr
*
* Extract an attribute of a heap tuple and return it as a Datum.
* This works for either system or user attributes. The given attnum
* is properly range-checked.
*
* If the field in question has a NULL value, we return a zero Datum
* and set *isnull == true. Otherwise, we set *isnull == false.
*
* <tup> is the pointer to the heap tuple. <attnum> is the attribute
* number of the column (field) caller wants. <tupleDesc> is a
* pointer to the structure describing the row and all its fields.
* ----------------
*/
#define heap_getattr(tup, attnum, tupleDesc, isnull) \
( \
AssertMacro((tup) != NULL), \
( \
((attnum) > 0) ? \
( \
((attnum) > (int) (tup)->t_data->t_natts) ? \
( \
((isnull) ? (*(isnull) = true) : (dummyret)NULL), \
(Datum)NULL \
) \
: \
fastgetattr((tup), (attnum), (tupleDesc), (isnull)) \
) \
: \
heap_getsysattr((tup), (attnum), (isnull)) \
) \
)
extern Datum heap_getsysattr(HeapTuple tup, int attnum, bool *isnull);
/* ----------------
* function prototypes for heap access method
*
* heap_create, heap_create_with_catalog, and heap_drop_with_catalog
* are declared in catalog/heap.h
* ----------------
*/
/* heapam.c */
extern Relation relation_open(Oid relationId, LOCKMODE lockmode);
extern Relation relation_openrv(const RangeVar *relation, LOCKMODE lockmode);
extern Relation relation_openr(const char *sysRelationName, LOCKMODE lockmode);
extern void relation_close(Relation relation, LOCKMODE lockmode);
extern Relation heap_open(Oid relationId, LOCKMODE lockmode);
extern Relation heap_openrv(const RangeVar *relation, LOCKMODE lockmode);
extern Relation heap_openr(const char *sysRelationName, LOCKMODE lockmode);
#define heap_close(r,l) relation_close(r,l)
extern HeapScanDesc heap_beginscan(Relation relation, Snapshot snapshot,
int nkeys, ScanKey key);
extern void heap_rescan(HeapScanDesc scan, ScanKey key);
extern void heap_endscan(HeapScanDesc scan);
extern HeapTuple heap_getnext(HeapScanDesc scan, ScanDirection direction);
extern bool heap_fetch(Relation relation, Snapshot snapshot,
HeapTuple tuple, Buffer *userbuf, bool keep_buf,
PgStat_Info *pgstat_info);
extern ItemPointer heap_get_latest_tid(Relation relation, Snapshot snapshot,
ItemPointer tid);
extern void setLastTid(const ItemPointer tid);
extern Oid heap_insert(Relation relation, HeapTuple tup, CommandId cid);
extern int heap_delete(Relation relation, ItemPointer tid, ItemPointer ctid,
CommandId cid, Snapshot crosscheck, bool wait);
extern int heap_update(Relation relation, ItemPointer otid, HeapTuple tup,
ItemPointer ctid, CommandId cid, Snapshot crosscheck, bool wait);
extern int heap_mark4update(Relation relation, HeapTuple tup,
Buffer *userbuf, CommandId cid);
extern Oid simple_heap_insert(Relation relation, HeapTuple tup);
extern void simple_heap_delete(Relation relation, ItemPointer tid);
extern void simple_heap_update(Relation relation, ItemPointer otid,
HeapTuple tup);
extern void heap_markpos(HeapScanDesc scan);
extern void heap_restrpos(HeapScanDesc scan);
extern void heap_redo(XLogRecPtr lsn, XLogRecord *rptr);
extern void heap_undo(XLogRecPtr lsn, XLogRecord *rptr);
extern void heap_desc(char *buf, uint8 xl_info, char *rec);
extern XLogRecPtr log_heap_clean(Relation reln, Buffer buffer,
OffsetNumber *unused, int uncnt);
extern XLogRecPtr log_heap_move(Relation reln, Buffer oldbuf,
ItemPointerData from,
Buffer newbuf, HeapTuple newtup);
/* in common/heaptuple.c */
extern Size ComputeDataSize(TupleDesc tupleDesc, Datum *value, char *nulls);
extern void DataFill(char *data, TupleDesc tupleDesc,
Datum *value, char *nulls, uint16 *infomask,
bits8 *bit);
extern int heap_attisnull(HeapTuple tup, int attnum);
extern Datum nocachegetattr(HeapTuple tup, int attnum,
TupleDesc att, bool *isnull);
extern HeapTuple heap_copytuple(HeapTuple tuple);
extern void heap_copytuple_with_tuple(HeapTuple src, HeapTuple dest);
extern HeapTuple heap_formtuple(TupleDesc tupleDescriptor,
Datum *value, char *nulls);
extern HeapTuple heap_modifytuple(HeapTuple tuple,
Relation relation, Datum *replValue, char *replNull, char *repl);
extern void heap_freetuple(HeapTuple tuple);
extern HeapTuple heap_addheader(int natts, bool withoid, Size structlen, void *structure);
#endif /* HEAPAM_H */
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