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tuptable.h
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1 /*-------------------------------------------------------------------------
2  *
3  * tuptable.h
4  * tuple table support stuff
5  *
6  *
7  * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
8  * Portions Copyright (c) 1994, Regents of the University of California
9  *
10  * src/include/executor/tuptable.h
11  *
12  *-------------------------------------------------------------------------
13  */
14 #ifndef TUPTABLE_H
15 #define TUPTABLE_H
16 
17 #include "access/htup.h"
18 #include "access/sysattr.h"
19 #include "access/tupdesc.h"
20 #include "access/htup_details.h"
21 #include "storage/buf.h"
22 
23 /*----------
24  * The executor stores tuples in a "tuple table" which is a List of
25  * independent TupleTableSlots.
26  *
27  * There's various different types of tuple table slots, each being able to
28  * store different types of tuples. Additional types of slots can be added
29  * without modifying core code. The type of a slot is determined by the
30  * TupleTableSlotOps* passed to the slot creation routine. The builtin types
31  * of slots are
32  *
33  * 1. physical tuple in a disk buffer page (TTSOpsBufferHeapTuple)
34  * 2. physical tuple constructed in palloc'ed memory (TTSOpsHeapTuple)
35  * 3. "minimal" physical tuple constructed in palloc'ed memory
36  * (TTSOpsMinimalTuple)
37  * 4. "virtual" tuple consisting of Datum/isnull arrays (TTSOpsVirtual)
38  *
39  *
40  * The first two cases are similar in that they both deal with "materialized"
41  * tuples, but resource management is different. For a tuple in a disk page
42  * we need to hold a pin on the buffer until the TupleTableSlot's reference
43  * to the tuple is dropped; while for a palloc'd tuple we usually want the
44  * tuple pfree'd when the TupleTableSlot's reference is dropped.
45  *
46  * A "minimal" tuple is handled similarly to a palloc'd regular tuple.
47  * At present, minimal tuples never are stored in buffers, so there is no
48  * parallel to case 1. Note that a minimal tuple has no "system columns".
49  * (Actually, it could have an OID, but we have no need to access the OID.)
50  *
51  * A "virtual" tuple is an optimization used to minimize physical data copying
52  * in a nest of plan nodes. Until materialized pass-by-reference Datums in
53  * the slot point to storage that is not directly associated with the
54  * TupleTableSlot; generally they will point to part of a tuple stored in a
55  * lower plan node's output TupleTableSlot, or to a function result
56  * constructed in a plan node's per-tuple econtext. It is the responsibility
57  * of the generating plan node to be sure these resources are not released for
58  * as long as the virtual tuple needs to be valid or is materialized. Note
59  * also that a virtual tuple does not have any "system columns".
60  *
61  * The Datum/isnull arrays of a TupleTableSlot serve double duty. For virtual
62  * slots they are the authoritative data. For the other builtin slots,
63  * the arrays contain data extracted from the tuple. (In this state, any
64  * pass-by-reference Datums point into the physical tuple.) The extracted
65  * information is built "lazily", ie, only as needed. This serves to avoid
66  * repeated extraction of data from the physical tuple.
67  *
68  * A TupleTableSlot can also be "empty", indicated by flag TTS_FLAG_EMPTY set
69  * in tts_flags, holding no valid data. This is the only valid state for a
70  * freshly-created slot that has not yet had a tuple descriptor assigned to
71  * it. In this state, TTS_SHOULDFREE should not be set in tts_flags, tts_tuple
72  * must be NULL and tts_nvalid zero.
73  *
74  * The tupleDescriptor is simply referenced, not copied, by the TupleTableSlot
75  * code. The caller of ExecSetSlotDescriptor() is responsible for providing
76  * a descriptor that will live as long as the slot does. (Typically, both
77  * slots and descriptors are in per-query memory and are freed by memory
78  * context deallocation at query end; so it's not worth providing any extra
79  * mechanism to do more. However, the slot will increment the tupdesc
80  * reference count if a reference-counted tupdesc is supplied.)
81  *
82  * When TTS_SHOULDFREE is set in tts_flags, the physical tuple is "owned" by
83  * the slot and should be freed when the slot's reference to the tuple is
84  * dropped.
85  *
86  * tts_values/tts_isnull are allocated either when the slot is created (when
87  * the descriptor is provided), or when a descriptor is assigned to the slot;
88  * they are of length equal to the descriptor's natts.
89  *
90  * The TTS_FLAG_SLOW flag is saved state for
91  * slot_deform_heap_tuple, and should not be touched by any other code.
92  *----------
93  */
94 
95 /* true = slot is empty */
96 #define TTS_FLAG_EMPTY (1 << 1)
97 #define TTS_EMPTY(slot) (((slot)->tts_flags & TTS_FLAG_EMPTY) != 0)
98 
99 /* should pfree tuple "owned" by the slot? */
100 #define TTS_FLAG_SHOULDFREE (1 << 2)
101 #define TTS_SHOULDFREE(slot) (((slot)->tts_flags & TTS_FLAG_SHOULDFREE) != 0)
102 
103 /* saved state for slot_deform_heap_tuple */
104 #define TTS_FLAG_SLOW (1 << 3)
105 #define TTS_SLOW(slot) (((slot)->tts_flags & TTS_FLAG_SLOW) != 0)
106 
107 /* fixed tuple descriptor */
108 #define TTS_FLAG_FIXED (1 << 4)
109 #define TTS_FIXED(slot) (((slot)->tts_flags & TTS_FLAG_FIXED) != 0)
110 
111 struct TupleTableSlotOps;
113 
114 /* base tuple table slot type */
115 typedef struct TupleTableSlot
116 {
118 #define FIELDNO_TUPLETABLESLOT_FLAGS 1
119  uint16 tts_flags; /* Boolean states */
120 #define FIELDNO_TUPLETABLESLOT_NVALID 2
121  AttrNumber tts_nvalid; /* # of valid values in tts_values */
122  const TupleTableSlotOps *const tts_ops; /* implementation of slot */
123 #define FIELDNO_TUPLETABLESLOT_TUPLEDESCRIPTOR 4
124  TupleDesc tts_tupleDescriptor; /* slot's tuple descriptor */
125 #define FIELDNO_TUPLETABLESLOT_VALUES 5
126  Datum *tts_values; /* current per-attribute values */
127 #define FIELDNO_TUPLETABLESLOT_ISNULL 6
128  bool *tts_isnull; /* current per-attribute isnull flags */
129  MemoryContext tts_mcxt; /* slot itself is in this context */
130  ItemPointerData tts_tid; /* stored tuple's tid */
131  Oid tts_tableOid; /* table oid of tuple */
133 
134 /* routines for a TupleTableSlot implementation */
136 {
137  /* Minimum size of the slot */
139 
140  /* Initialization. */
141  void (*init) (TupleTableSlot *slot);
142 
143  /* Destruction. */
144  void (*release) (TupleTableSlot *slot);
145 
146  /*
147  * Clear the contents of the slot. Only the contents are expected to be
148  * cleared and not the tuple descriptor. Typically an implementation of
149  * this callback should free the memory allocated for the tuple contained
150  * in the slot.
151  */
152  void (*clear) (TupleTableSlot *slot);
153 
154  /*
155  * Fill up first natts entries of tts_values and tts_isnull arrays with
156  * values from the tuple contained in the slot. The function may be called
157  * with natts more than the number of attributes available in the tuple,
158  * in which case it should set tts_nvalid to the number of returned
159  * columns.
160  */
161  void (*getsomeattrs) (TupleTableSlot *slot, int natts);
162 
163  /*
164  * Returns value of the given system attribute as a datum and sets isnull
165  * to false, if it's not NULL. Throws an error if the slot type does not
166  * support system attributes.
167  */
168  Datum (*getsysattr) (TupleTableSlot *slot, int attnum, bool *isnull);
169 
170  /*
171  * Make the contents of the slot solely depend on the slot, and not on
172  * underlying resources (like another memory context, buffers, etc).
173  */
174  void (*materialize) (TupleTableSlot *slot);
175 
176  /*
177  * Copy the contents of the source slot into the destination slot's own
178  * context. Invoked using callback of the destination slot.
179  */
180  void (*copyslot) (TupleTableSlot *dstslot, TupleTableSlot *srcslot);
181 
182  /*
183  * Return a heap tuple "owned" by the slot. It is slot's responsibility to
184  * free the memory consumed by the heap tuple. If the slot can not "own" a
185  * heap tuple, it should not implement this callback and should set it as
186  * NULL.
187  */
188  HeapTuple (*get_heap_tuple) (TupleTableSlot *slot);
189 
190  /*
191  * Return a minimal tuple "owned" by the slot. It is slot's responsibility
192  * to free the memory consumed by the minimal tuple. If the slot can not
193  * "own" a minimal tuple, it should not implement this callback and should
194  * set it as NULL.
195  */
196  MinimalTuple (*get_minimal_tuple) (TupleTableSlot *slot);
197 
198  /*
199  * Return a copy of heap tuple representing the contents of the slot. The
200  * copy needs to be palloc'd in the current memory context. The slot
201  * itself is expected to remain unaffected. It is *not* expected to have
202  * meaningful "system columns" in the copy. The copy is not be "owned" by
203  * the slot i.e. the caller has to take responsibility to free memory
204  * consumed by the slot.
205  */
206  HeapTuple (*copy_heap_tuple) (TupleTableSlot *slot);
207 
208  /*
209  * Return a copy of minimal tuple representing the contents of the slot.
210  * The copy needs to be palloc'd in the current memory context. The slot
211  * itself is expected to remain unaffected. It is *not* expected to have
212  * meaningful "system columns" in the copy. The copy is not be "owned" by
213  * the slot i.e. the caller has to take responsibility to free memory
214  * consumed by the slot.
215  */
216  MinimalTuple (*copy_minimal_tuple) (TupleTableSlot *slot);
217 };
218 
219 /*
220  * Predefined TupleTableSlotOps for various types of TupleTableSlotOps. The
221  * same are used to identify the type of a given slot.
222  */
227 
228 #define TTS_IS_VIRTUAL(slot) ((slot)->tts_ops == &TTSOpsVirtual)
229 #define TTS_IS_HEAPTUPLE(slot) ((slot)->tts_ops == &TTSOpsHeapTuple)
230 #define TTS_IS_MINIMALTUPLE(slot) ((slot)->tts_ops == &TTSOpsMinimalTuple)
231 #define TTS_IS_BUFFERTUPLE(slot) ((slot)->tts_ops == &TTSOpsBufferHeapTuple)
232 
233 
234 /*
235  * Tuple table slot implementations.
236  */
237 
238 typedef struct VirtualTupleTableSlot
239 {
241 
242  char *data; /* data for materialized slots */
244 
245 typedef struct HeapTupleTableSlot
246 {
248 
249 #define FIELDNO_HEAPTUPLETABLESLOT_TUPLE 1
250  HeapTuple tuple; /* physical tuple */
251 #define FIELDNO_HEAPTUPLETABLESLOT_OFF 2
252  uint32 off; /* saved state for slot_deform_heap_tuple */
253  HeapTupleData tupdata; /* optional workspace for storing tuple */
255 
256 /* heap tuple residing in a buffer */
258 {
260 
261  /*
262  * If buffer is not InvalidBuffer, then the slot is holding a pin on the
263  * indicated buffer page; drop the pin when we release the slot's
264  * reference to that buffer. (TTS_FLAG_SHOULDFREE should not be set in
265  * such a case, since presumably tts_tuple is pointing into the buffer.)
266  */
267  Buffer buffer; /* tuple's buffer, or InvalidBuffer */
269 
270 typedef struct MinimalTupleTableSlot
271 {
273 
274  /*
275  * In a minimal slot tuple points at minhdr and the fields of that struct
276  * are set correctly for access to the minimal tuple; in particular,
277  * minhdr.t_data points MINIMAL_TUPLE_OFFSET bytes before mintuple. This
278  * allows column extraction to treat the case identically to regular
279  * physical tuples.
280  */
281 #define FIELDNO_MINIMALTUPLETABLESLOT_TUPLE 1
282  HeapTuple tuple; /* tuple wrapper */
283  MinimalTuple mintuple; /* minimal tuple, or NULL if none */
284  HeapTupleData minhdr; /* workspace for minimal-tuple-only case */
285 #define FIELDNO_MINIMALTUPLETABLESLOT_OFF 4
286  uint32 off; /* saved state for slot_deform_heap_tuple */
288 
289 /*
290  * TupIsNull -- is a TupleTableSlot empty?
291  */
292 #define TupIsNull(slot) \
293  ((slot) == NULL || TTS_EMPTY(slot))
294 
295 /* in executor/execTuples.c */
297  const TupleTableSlotOps *tts_ops);
298 extern TupleTableSlot *ExecAllocTableSlot(List **tupleTable, TupleDesc desc,
299  const TupleTableSlotOps *tts_ops);
300 extern void ExecResetTupleTable(List *tupleTable, bool shouldFree);
302  const TupleTableSlotOps *tts_ops);
304 extern void ExecSetSlotDescriptor(TupleTableSlot *slot, TupleDesc tupdesc);
306  TupleTableSlot *slot,
307  bool shouldFree);
308 extern void ExecForceStoreHeapTuple(HeapTuple tuple,
309  TupleTableSlot *slot,
310  bool shouldFree);
312  TupleTableSlot *slot,
313  Buffer buffer);
315  TupleTableSlot *slot,
316  Buffer buffer);
318  TupleTableSlot *slot,
319  bool shouldFree);
321  bool shouldFree);
324 extern void ExecStoreHeapTupleDatum(Datum data, TupleTableSlot *slot);
325 extern HeapTuple ExecFetchSlotHeapTuple(TupleTableSlot *slot, bool materialize, bool *shouldFree);
327  bool *shouldFree);
329 extern void slot_getmissingattrs(TupleTableSlot *slot, int startAttNum,
330  int lastAttNum);
331 extern void slot_getsomeattrs_int(TupleTableSlot *slot, int attnum);
332 
333 
334 #ifndef FRONTEND
335 
336 /*
337  * This function forces the entries of the slot's Datum/isnull arrays to be
338  * valid at least up through the attnum'th entry.
339  */
340 static inline void
342 {
343  if (slot->tts_nvalid < attnum)
344  slot_getsomeattrs_int(slot, attnum);
345 }
346 
347 /*
348  * slot_getallattrs
349  * This function forces all the entries of the slot's Datum/isnull
350  * arrays to be valid. The caller may then extract data directly
351  * from those arrays instead of using slot_getattr.
352  */
353 static inline void
355 {
357 }
358 
359 
360 /*
361  * slot_attisnull
362  *
363  * Detect whether an attribute of the slot is null, without actually fetching
364  * it.
365  */
366 static inline bool
368 {
369  AssertArg(attnum > 0);
370 
371  if (attnum > slot->tts_nvalid)
372  slot_getsomeattrs(slot, attnum);
373 
374  return slot->tts_isnull[attnum - 1];
375 }
376 
377 /*
378  * slot_getattr - fetch one attribute of the slot's contents.
379  */
380 static inline Datum
382  bool *isnull)
383 {
384  AssertArg(attnum > 0);
385 
386  if (attnum > slot->tts_nvalid)
387  slot_getsomeattrs(slot, attnum);
388 
389  *isnull = slot->tts_isnull[attnum - 1];
390 
391  return slot->tts_values[attnum - 1];
392 }
393 
394 /*
395  * slot_getsysattr - fetch a system attribute of the slot's current tuple.
396  *
397  * If the slot type does not contain system attributes, this will throw an
398  * error. Hence before calling this function, callers should make sure that
399  * the slot type is the one that supports system attributes.
400  */
401 static inline Datum
402 slot_getsysattr(TupleTableSlot *slot, int attnum, bool *isnull)
403 {
404  AssertArg(attnum < 0); /* caller error */
405 
406  if (attnum == TableOidAttributeNumber)
407  {
408  *isnull = false;
409  return ObjectIdGetDatum(slot->tts_tableOid);
410  }
411  else if (attnum == SelfItemPointerAttributeNumber)
412  {
413  *isnull = false;
414  return PointerGetDatum(&slot->tts_tid);
415  }
416 
417  /* Fetch the system attribute from the underlying tuple. */
418  return slot->tts_ops->getsysattr(slot, attnum, isnull);
419 }
420 
421 /*
422  * ExecClearTuple - clear the slot's contents
423  */
424 static inline TupleTableSlot *
426 {
427  slot->tts_ops->clear(slot);
428 
429  return slot;
430 }
431 
432 /* ExecMaterializeSlot - force a slot into the "materialized" state.
433  *
434  * This causes the slot's tuple to be a local copy not dependent on any
435  * external storage (i.e. pointing into a Buffer, or having allocations in
436  * another memory context).
437  *
438  * A typical use for this operation is to prepare a computed tuple for being
439  * stored on disk. The original data may or may not be virtual, but in any
440  * case we need a private copy for heap_insert to scribble on.
441  */
442 static inline void
444 {
445  slot->tts_ops->materialize(slot);
446 }
447 
448 /*
449  * ExecCopySlotHeapTuple - return HeapTuple allocated in caller's context
450  */
451 static inline HeapTuple
453 {
454  Assert(!TTS_EMPTY(slot));
455 
456  return slot->tts_ops->copy_heap_tuple(slot);
457 }
458 
459 /*
460  * ExecCopySlotMinimalTuple - return MinimalTuple allocated in caller's context
461  */
462 static inline MinimalTuple
464 {
465  return slot->tts_ops->copy_minimal_tuple(slot);
466 }
467 
468 /*
469  * ExecCopySlot - copy one slot's contents into another.
470  *
471  * If a source's system attributes are supposed to be accessed in the target
472  * slot, the target slot and source slot types need to match.
473  */
474 static inline TupleTableSlot *
476 {
477  Assert(!TTS_EMPTY(srcslot));
478  AssertArg(srcslot != dstslot);
479 
480  dstslot->tts_ops->copyslot(dstslot, srcslot);
481 
482  return dstslot;
483 }
484 
485 #endif /* FRONTEND */
486 
487 #endif /* TUPTABLE_H */
HeapTuple ExecFetchSlotHeapTuple(TupleTableSlot *slot, bool materialize, bool *shouldFree)
Definition: execTuples.c:1614
TupleTableSlot * ExecStoreVirtualTuple(TupleTableSlot *slot)
Definition: execTuples.c:1522
PGDLLIMPORT const TupleTableSlotOps TTSOpsHeapTuple
Definition: execTuples.c:84
static TupleTableSlot * ExecCopySlot(TupleTableSlot *dstslot, TupleTableSlot *srcslot)
Definition: tuptable.h:475
Oid tts_tableOid
Definition: tuptable.h:131
Datum(* getsysattr)(TupleTableSlot *slot, int attnum, bool *isnull)
Definition: tuptable.h:168
HeapTupleData * HeapTuple
Definition: htup.h:71
TupleTableSlot * MakeTupleTableSlot(TupleDesc tupleDesc, const TupleTableSlotOps *tts_ops)
Definition: execTuples.c:1082
TupleTableSlot base
Definition: tuptable.h:272
static TupleTableSlot * ExecClearTuple(TupleTableSlot *slot)
Definition: tuptable.h:425
TupleTableSlot * ExecStoreHeapTuple(HeapTuple tuple, TupleTableSlot *slot, bool shouldFree)
Definition: execTuples.c:1322
HeapTuple(* copy_heap_tuple)(TupleTableSlot *slot)
Definition: tuptable.h:206
void ExecStoreHeapTupleDatum(Datum data, TupleTableSlot *slot)
Definition: execTuples.c:1576
#define TTS_EMPTY(slot)
Definition: tuptable.h:97
#define PointerGetDatum(X)
Definition: postgres.h:556
TupleTableSlot * ExecStoreAllNullTuple(TupleTableSlot *slot)
Definition: execTuples.c:1546
void ExecResetTupleTable(List *tupleTable, bool shouldFree)
Definition: execTuples.c:1161
PGDLLIMPORT const TupleTableSlotOps TTSOpsVirtual
Definition: execTuples.c:83
void ExecSetSlotDescriptor(TupleTableSlot *slot, TupleDesc tupdesc)
Definition: execTuples.c:1259
static void slot_getsomeattrs(TupleTableSlot *slot, int attnum)
Definition: tuptable.h:341
const TupleTableSlotOps *const tts_ops
Definition: tuptable.h:122
HeapTuple tuple
Definition: tuptable.h:250
PGDLLIMPORT const TupleTableSlotOps TTSOpsBufferHeapTuple
Definition: execTuples.c:86
MemoryContext tts_mcxt
Definition: tuptable.h:129
Datum * tts_values
Definition: tuptable.h:126
void ExecForceStoreMinimalTuple(MinimalTuple mtup, TupleTableSlot *slot, bool shouldFree)
Definition: execTuples.c:1482
void ExecForceStoreHeapTuple(HeapTuple tuple, TupleTableSlot *slot, bool shouldFree)
Definition: execTuples.c:1439
struct VirtualTupleTableSlot VirtualTupleTableSlot
unsigned int Oid
Definition: postgres_ext.h:31
NodeTag
Definition: nodes.h:26
#define PGDLLIMPORT
Definition: c.h:1266
NodeTag type
Definition: tuptable.h:117
uint16 tts_flags
Definition: tuptable.h:119
TupleTableSlot base
Definition: tuptable.h:247
TupleTableSlot * ExecStorePinnedBufferHeapTuple(HeapTuple tuple, TupleTableSlot *slot, Buffer buffer)
Definition: execTuples.c:1388
unsigned short uint16
Definition: c.h:358
struct HeapTupleTableSlot HeapTupleTableSlot
#define ObjectIdGetDatum(X)
Definition: postgres.h:507
static void slot_getallattrs(TupleTableSlot *slot)
Definition: tuptable.h:354
static MinimalTuple ExecCopySlotMinimalTuple(TupleTableSlot *slot)
Definition: tuptable.h:463
bool * tts_isnull
Definition: tuptable.h:128
MinimalTupleData * MinimalTuple
Definition: htup.h:27
TupleTableSlot * ExecStoreBufferHeapTuple(HeapTuple tuple, TupleTableSlot *slot, Buffer buffer)
Definition: execTuples.c:1362
void(* clear)(TupleTableSlot *slot)
Definition: tuptable.h:152
#define TableOidAttributeNumber
Definition: sysattr.h:26
unsigned int uint32
Definition: c.h:359
TupleTableSlot * MakeSingleTupleTableSlot(TupleDesc tupdesc, const TupleTableSlotOps *tts_ops)
Definition: execTuples.c:1208
#define init()
Datum ExecFetchSlotHeapTupleDatum(TupleTableSlot *slot)
Definition: execTuples.c:1693
#define AssertArg(condition)
Definition: c.h:735
struct BufferHeapTupleTableSlot BufferHeapTupleTableSlot
TupleDesc tts_tupleDescriptor
Definition: tuptable.h:124
void slot_getmissingattrs(TupleTableSlot *slot, int startAttNum, int lastAttNum)
Definition: execTuples.c:1838
uintptr_t Datum
Definition: postgres.h:367
void ExecDropSingleTupleTableSlot(TupleTableSlot *slot)
Definition: execTuples.c:1224
PGDLLIMPORT const TupleTableSlotOps TTSOpsMinimalTuple
Definition: execTuples.c:85
static void ExecMaterializeSlot(TupleTableSlot *slot)
Definition: tuptable.h:443
TupleTableSlot base
Definition: tuptable.h:240
static Datum slot_getattr(TupleTableSlot *slot, int attnum, bool *isnull)
Definition: tuptable.h:381
int16 attnum
Definition: pg_attribute.h:79
static HeapTuple ExecCopySlotHeapTuple(TupleTableSlot *slot)
Definition: tuptable.h:452
struct TupleTableSlot TupleTableSlot
TupleTableSlot * ExecStoreMinimalTuple(MinimalTuple mtup, TupleTableSlot *slot, bool shouldFree)
Definition: execTuples.c:1416
struct MinimalTupleTableSlot MinimalTupleTableSlot
MinimalTuple(* copy_minimal_tuple)(TupleTableSlot *slot)
Definition: tuptable.h:216
#define Assert(condition)
Definition: c.h:733
TupleTableSlot * ExecAllocTableSlot(List **tupleTable, TupleDesc desc, const TupleTableSlotOps *tts_ops)
Definition: execTuples.c:1141
void(* materialize)(TupleTableSlot *slot)
Definition: tuptable.h:174
void slot_getsomeattrs_int(TupleTableSlot *slot, int attnum)
Definition: execTuples.c:1872
MinimalTuple mintuple
Definition: tuptable.h:283
void(* copyslot)(TupleTableSlot *dstslot, TupleTableSlot *srcslot)
Definition: tuptable.h:180
HeapTupleData minhdr
Definition: tuptable.h:284
AttrNumber tts_nvalid
Definition: tuptable.h:121
#define SelfItemPointerAttributeNumber
Definition: sysattr.h:21
HeapTupleTableSlot base
Definition: tuptable.h:259
static Datum slot_getsysattr(TupleTableSlot *slot, int attnum, bool *isnull)
Definition: tuptable.h:402
static bool slot_attisnull(TupleTableSlot *slot, int attnum)
Definition: tuptable.h:367
HeapTupleData tupdata
Definition: tuptable.h:253
Definition: pg_list.h:50
ItemPointerData tts_tid
Definition: tuptable.h:130
int Buffer
Definition: buf.h:23
int16 AttrNumber
Definition: attnum.h:21
MinimalTuple ExecFetchSlotMinimalTuple(TupleTableSlot *slot, bool *shouldFree)
Definition: execTuples.c:1662
size_t base_slot_size
Definition: tuptable.h:138