1 /*-------------------------------------------------------------------------
4 * POSTGRES heap access method definitions.
7 * Copyright (c) 1994, Regents of the University of California
9 * $Id: heapam.h,v 1.34 1998/07/27 19:38:29 vadim Exp $
11 *-------------------------------------------------------------------------
16 #include <access/tupmacs.h>
17 #include <access/htup.h>
18 #include <access/relscan.h>
19 #include <storage/block.h>
20 #include <utils/rel.h>
21 #include <utils/tqual.h>
23 /* ----------------------------------------------------------------
24 * heap access method statistics
25 * ----------------------------------------------------------------
28 typedef struct HeapAccessStatisticsData
30 time_t init_global_timestamp; /* time global statistics started */
31 time_t local_reset_timestamp; /* last time local reset was done */
32 time_t last_request_timestamp; /* last time stats were requested */
47 int global_BufferGetRelation;
48 int global_RelationIdGetRelation;
49 int global_RelationIdGetRelation_Buf;
50 int global_RelationNameGetRelation;
51 int global_getreldesc;
52 int global_heapgettup;
53 int global_RelationPutHeapTuple;
54 int global_RelationPutLongHeapTuple;
69 int local_BufferGetRelation;
70 int local_RelationIdGetRelation;
71 int local_RelationIdGetRelation_Buf;
72 int local_RelationNameGetRelation;
75 int local_RelationPutHeapTuple;
76 int local_RelationPutLongHeapTuple;
77 } HeapAccessStatisticsData;
79 typedef HeapAccessStatisticsData *HeapAccessStatistics;
81 #define IncrHeapAccessStat(x) \
82 (heap_access_stats == NULL ? 0 : (heap_access_stats->x)++)
87 * This gets called many times, so we macro the cacheable and NULL
88 * lookups, and call noncachegetattr() for the rest.
92 #if !defined(DISABLE_COMPLEX_MACRO)
94 #define fastgetattr(tup, attnum, tupleDesc, isnull) \
96 AssertMacro((attnum) > 0), \
97 ((isnull) ? (*(isnull) = false) : (dummyret)NULL), \
98 HeapTupleNoNulls(tup) ? \
100 ((tupleDesc)->attrs[(attnum)-1]->attcacheoff != -1 || \
103 (Datum)fetchatt(&((tupleDesc)->attrs[(attnum)-1]), \
104 (char *) (tup) + (tup)->t_hoff + \
107 (tupleDesc)->attrs[(attnum)-1]->attcacheoff \
114 nocachegetattr((tup), (attnum), (tupleDesc), (isnull)) \
118 att_isnull((attnum)-1, (tup)->t_bits) ? \
120 ((isnull) ? (*(isnull) = true) : (dummyret)NULL), \
125 nocachegetattr((tup), (attnum), (tupleDesc), (isnull)) \
130 #else /* !defined(DISABLE_COMPLEX_MACRO) */
132 extern Datum nocachegetattr(HeapTuple tup, int attnum,
133 TupleDesc att, bool *isnull);
135 static Datum fastgetattr(HeapTuple tup, int attnum, TupleDesc tupleDesc,
141 ((isnull) ? (*(isnull) = false) : (dummyret)NULL),
142 HeapTupleNoNulls(tup) ?
144 ((tupleDesc)->attrs[(attnum)-1]->attcacheoff != -1 ||
147 (Datum)fetchatt(&((tupleDesc)->attrs[(attnum)-1]),
148 (char *) (tup) + (tup)->t_hoff +
151 (tupleDesc)->attrs[(attnum)-1]->attcacheoff
158 nocachegetattr((tup), (attnum), (tupleDesc), (isnull))
162 att_isnull((attnum)-1, (tup)->t_bits) ?
164 ((isnull) ? (*(isnull) = true) : (dummyret)NULL),
169 nocachegetattr((tup), (attnum), (tupleDesc), (isnull))
185 * Find a particular field in a row represented as a heap tuple.
186 * We return a pointer into that heap tuple, which points to the
187 * first byte of the value of the field in question.
189 * If the field in question has a NULL value, we return a null
190 * pointer and return <*isnull> == true. Otherwise, we return
191 * <*isnull> == false.
193 * <tup> is the pointer to the heap tuple. <attnum> is the attribute
194 * number of the column (field) caller wants. <tupleDesc> is a
195 * pointer to the structure describing the row and all its fields.
197 * Because this macro is often called with constants, it generates
198 * compiler warnings about 'left-hand comma expression has no effect.
202 #define heap_getattr(tup, attnum, tupleDesc, isnull) \
204 AssertMacro((tup) != NULL && \
205 (attnum) > FirstLowInvalidHeapAttributeNumber && \
207 ((attnum) > (int) (tup)->t_natts) ? \
209 ((isnull) ? (*(isnull) = true) : (dummyret)NULL), \
216 fastgetattr((tup), (attnum), (tupleDesc), (isnull)) \
220 ((isnull) ? (*(isnull) = false) : (dummyret)NULL), \
221 ((attnum) == SelfItemPointerAttributeNumber) ? \
223 (Datum)((char *)(tup) + \
224 heap_sysoffset[-SelfItemPointerAttributeNumber-1]) \
228 (Datum)*(unsigned int *) \
229 ((char *)(tup) + heap_sysoffset[-(attnum)-1]) \
235 extern HeapAccessStatistics heap_access_stats; /* in stats.c */
238 * function prototypes for heap access method
241 /* heap_create, heap_creatr, and heap_destroy are declared in catalog/heap.h */
244 extern void doinsert(Relation relation, HeapTuple tup);
246 extern Relation heap_open(Oid relationId);
247 extern Relation heap_openr(char *relationName);
248 extern void heap_close(Relation relation);
250 heap_beginscan(Relation relation, int atend,
251 Snapshot snapshot, unsigned nkeys, ScanKey key);
252 extern void heap_rescan(HeapScanDesc sdesc, bool scanFromEnd, ScanKey key);
253 extern void heap_endscan(HeapScanDesc sdesc);
254 extern HeapTuple heap_getnext(HeapScanDesc scandesc, int backw, Buffer *b);
255 extern HeapTuple heap_fetch(Relation relation, Snapshot snapshot, ItemPointer tid, Buffer *b);
256 extern Oid heap_insert(Relation relation, HeapTuple tup);
257 extern int heap_delete(Relation relation, ItemPointer tid);
259 heap_replace(Relation relation, ItemPointer otid,
261 extern void heap_markpos(HeapScanDesc sdesc);
262 extern void heap_restrpos(HeapScanDesc sdesc);
264 /* in common/heaptuple.c */
265 extern Size ComputeDataSize(TupleDesc tupleDesc, Datum value[], char nulls[]);
267 DataFill(char *data, TupleDesc tupleDesc,
268 Datum value[], char nulls[], uint16 *infomask,
270 extern int heap_attisnull(HeapTuple tup, int attnum);
271 extern int heap_sysattrlen(AttrNumber attno);
272 extern bool heap_sysattrbyval(AttrNumber attno);
273 extern Datum heap_getsysattr(HeapTuple tup, Buffer b, int attnum);
275 nocachegetattr(HeapTuple tup, int attnum,
276 TupleDesc att, bool *isnull);
277 extern HeapTuple heap_copytuple(HeapTuple tuple);
279 heap_formtuple(TupleDesc tupleDescriptor,
280 Datum value[], char nulls[]);
282 heap_modifytuple(HeapTuple tuple, Buffer buffer,
283 Relation relation, Datum replValue[], char replNull[], char repl[]);
284 HeapTuple heap_addheader(uint32 natts, int structlen, char *structure);
286 /* in common/heap/stats.c */
287 extern void PrintHeapAccessStatistics(HeapAccessStatistics stats);
288 extern void initam(void);
292 RelationPutHeapTuple(Relation relation, BlockNumber blockIndex,
294 extern void RelationPutHeapTupleAtEnd(Relation relation, HeapTuple tuple);
296 #endif /* HEAPAM_H */