Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * tuptable.h
4 : * tuple table support stuff
5 : *
6 : *
7 : * Portions Copyright (c) 1996-2026, 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 "storage/buf.h"
21 :
22 : /*----------
23 : * The executor stores tuples in a "tuple table" which is a List of
24 : * independent TupleTableSlots.
25 : *
26 : * There's various different types of tuple table slots, each being able to
27 : * store different types of tuples. Additional types of slots can be added
28 : * without modifying core code. The type of a slot is determined by the
29 : * TupleTableSlotOps* passed to the slot creation routine. The builtin types
30 : * of slots are
31 : *
32 : * 1. physical tuple in a disk buffer page (TTSOpsBufferHeapTuple)
33 : * 2. physical tuple constructed in palloc'ed memory (TTSOpsHeapTuple)
34 : * 3. "minimal" physical tuple constructed in palloc'ed memory
35 : * (TTSOpsMinimalTuple)
36 : * 4. "virtual" tuple consisting of Datum/isnull arrays (TTSOpsVirtual)
37 : *
38 : *
39 : * The first two cases are similar in that they both deal with "materialized"
40 : * tuples, but resource management is different. For a tuple in a disk page
41 : * we need to hold a pin on the buffer until the TupleTableSlot's reference
42 : * to the tuple is dropped; while for a palloc'd tuple we usually want the
43 : * tuple pfree'd when the TupleTableSlot's reference is dropped.
44 : *
45 : * A "minimal" tuple is handled similarly to a palloc'd regular tuple.
46 : * At present, minimal tuples never are stored in buffers, so there is no
47 : * parallel to case 1. Note that a minimal tuple has no "system columns".
48 : *
49 : * A "virtual" tuple is an optimization used to minimize physical data copying
50 : * in a nest of plan nodes. Until materialized pass-by-reference Datums in
51 : * the slot point to storage that is not directly associated with the
52 : * TupleTableSlot; generally they will point to part of a tuple stored in a
53 : * lower plan node's output TupleTableSlot, or to a function result
54 : * constructed in a plan node's per-tuple econtext. It is the responsibility
55 : * of the generating plan node to be sure these resources are not released for
56 : * as long as the virtual tuple needs to be valid or is materialized. Note
57 : * also that a virtual tuple does not have any "system columns".
58 : *
59 : * The Datum/isnull arrays of a TupleTableSlot serve double duty. For virtual
60 : * slots they are the authoritative data. For the other builtin slots,
61 : * the arrays contain data extracted from the tuple. (In this state, any
62 : * pass-by-reference Datums point into the physical tuple.) The extracted
63 : * information is built "lazily", ie, only as needed. This serves to avoid
64 : * repeated extraction of data from the physical tuple.
65 : *
66 : * A TupleTableSlot can also be "empty", indicated by flag TTS_FLAG_EMPTY set
67 : * in tts_flags, holding no valid data. This is the only valid state for a
68 : * freshly-created slot that has not yet had a tuple descriptor assigned to
69 : * it. In this state, TTS_FLAG_SHOULDFREE should not be set in tts_flags and
70 : * tts_nvalid should be set to zero.
71 : *
72 : * The tupleDescriptor is simply referenced, not copied, by the TupleTableSlot
73 : * code. The caller of ExecSetSlotDescriptor() is responsible for providing
74 : * a descriptor that will live as long as the slot does. (Typically, both
75 : * slots and descriptors are in per-query memory and are freed by memory
76 : * context deallocation at query end; so it's not worth providing any extra
77 : * mechanism to do more. However, the slot will increment the tupdesc
78 : * reference count if a reference-counted tupdesc is supplied.)
79 : *
80 : * When TTS_FLAG_SHOULDFREE is set in tts_flags, the physical tuple is "owned"
81 : * by the slot and should be freed when the slot's reference to the tuple is
82 : * dropped.
83 : *
84 : * tts_values/tts_isnull are allocated either when the slot is created (when
85 : * the descriptor is provided), or when a descriptor is assigned to the slot;
86 : * they are of length equal to the descriptor's natts.
87 : *----------
88 : */
89 :
90 : /* true = slot is empty */
91 : #define TTS_FLAG_EMPTY (1 << 1)
92 : #define TTS_EMPTY(slot) (((slot)->tts_flags & TTS_FLAG_EMPTY) != 0)
93 :
94 : /* should pfree tuple "owned" by the slot? */
95 : #define TTS_FLAG_SHOULDFREE (1 << 2)
96 : #define TTS_SHOULDFREE(slot) (((slot)->tts_flags & TTS_FLAG_SHOULDFREE) != 0)
97 :
98 : /*
99 : * true = slot's formed tuple guaranteed to not have NULLs in NOT NULLable
100 : * columns.
101 : */
102 : #define TTS_FLAG_OBEYS_NOT_NULL_CONSTRAINTS (1 << 3)
103 : #define TTS_OBEYS_NOT_NULL_CONSTRAINTS(slot) \
104 : (((slot)->tts_flags & TTS_FLAG_OBEYS_NOT_NULL_CONSTRAINTS) != 0)
105 :
106 : /* fixed tuple descriptor */
107 : #define TTS_FLAG_FIXED (1 << 4)
108 : #define TTS_FIXED(slot) (((slot)->tts_flags & TTS_FLAG_FIXED) != 0)
109 :
110 : /*
111 : * Defines which of the above flags should never be set in tts_flags when the
112 : * TupleTableSlot is created.
113 : */
114 : #define TTS_FLAGS_TRANSIENT (TTS_FLAG_EMPTY|TTS_FLAG_SHOULDFREE)
115 :
116 : struct TupleTableSlotOps;
117 : typedef struct TupleTableSlotOps TupleTableSlotOps;
118 :
119 : /* base tuple table slot type */
120 : typedef struct TupleTableSlot
121 : {
122 : NodeTag type;
123 : #define FIELDNO_TUPLETABLESLOT_FLAGS 1
124 : uint16 tts_flags; /* Boolean states */
125 : #define FIELDNO_TUPLETABLESLOT_NVALID 2
126 : AttrNumber tts_nvalid; /* # of valid values in tts_values */
127 : const TupleTableSlotOps *const tts_ops; /* implementation of slot */
128 : #define FIELDNO_TUPLETABLESLOT_TUPLEDESCRIPTOR 4
129 : TupleDesc tts_tupleDescriptor; /* slot's tuple descriptor */
130 : #define FIELDNO_TUPLETABLESLOT_VALUES 5
131 : Datum *tts_values; /* current per-attribute values */
132 : #define FIELDNO_TUPLETABLESLOT_ISNULL 6
133 : bool *tts_isnull; /* current per-attribute isnull flags. Array
134 : * size must always be rounded up to the next
135 : * multiple of 8 elements. */
136 : int tts_first_nonguaranteed; /* The value from the TupleDesc's
137 : * firstNonGuaranteedAttr, or 0
138 : * when tts_flags does not contain
139 : * TTS_FLAG_OBEYS_NOT_NULL_CONSTRAINTS */
140 :
141 : MemoryContext tts_mcxt; /* slot itself is in this context */
142 : ItemPointerData tts_tid; /* stored tuple's tid */
143 : Oid tts_tableOid; /* table oid of tuple */
144 : } TupleTableSlot;
145 :
146 : /* routines for a TupleTableSlot implementation */
147 : struct TupleTableSlotOps
148 : {
149 : /* Minimum size of the slot */
150 : size_t base_slot_size;
151 :
152 : /* Initialization. */
153 : void (*init) (TupleTableSlot *slot);
154 :
155 : /* Destruction. */
156 : void (*release) (TupleTableSlot *slot);
157 :
158 : /*
159 : * Clear the contents of the slot. Only the contents are expected to be
160 : * cleared and not the tuple descriptor. Typically an implementation of
161 : * this callback should free the memory allocated for the tuple contained
162 : * in the slot.
163 : */
164 : void (*clear) (TupleTableSlot *slot);
165 :
166 : /*
167 : * Fill up first natts entries of tts_values and tts_isnull arrays with
168 : * values from the tuple contained in the slot and set the slot's
169 : * tts_nvalid to natts. The function may be called with an natts value
170 : * more than the number of attributes available in the tuple, in which
171 : * case the function must call slot_getmissingattrs() to populate the
172 : * remaining attributes. The function must raise an ERROR if 'natts' is
173 : * higher than the number of attributes in the slot's TupleDesc.
174 : */
175 : void (*getsomeattrs) (TupleTableSlot *slot, int natts);
176 :
177 : /*
178 : * Returns value of the given system attribute as a datum and sets isnull
179 : * to false, if it's not NULL. Throws an error if the slot type does not
180 : * support system attributes.
181 : */
182 : Datum (*getsysattr) (TupleTableSlot *slot, int attnum, bool *isnull);
183 :
184 : /*
185 : * Check if the tuple is created by the current transaction. Throws an
186 : * error if the slot doesn't contain the storage tuple.
187 : */
188 : bool (*is_current_xact_tuple) (TupleTableSlot *slot);
189 :
190 : /*
191 : * Make the contents of the slot solely depend on the slot, and not on
192 : * underlying resources (like another memory context, buffers, etc).
193 : */
194 : void (*materialize) (TupleTableSlot *slot);
195 :
196 : /*
197 : * Copy the contents of the source slot into the destination slot's own
198 : * context. Invoked using callback of the destination slot. 'dstslot' and
199 : * 'srcslot' can be assumed to have the same number of attributes.
200 : */
201 : void (*copyslot) (TupleTableSlot *dstslot, TupleTableSlot *srcslot);
202 :
203 : /*
204 : * Return a heap tuple "owned" by the slot. It is slot's responsibility to
205 : * free the memory consumed by the heap tuple. If the slot can not "own" a
206 : * heap tuple, it should not implement this callback and should set it as
207 : * NULL.
208 : */
209 : HeapTuple (*get_heap_tuple) (TupleTableSlot *slot);
210 :
211 : /*
212 : * Return a minimal tuple "owned" by the slot. It is slot's responsibility
213 : * to free the memory consumed by the minimal tuple. If the slot can not
214 : * "own" a minimal tuple, it should not implement this callback and should
215 : * set it as NULL.
216 : */
217 : MinimalTuple (*get_minimal_tuple) (TupleTableSlot *slot);
218 :
219 : /*
220 : * Return a copy of heap tuple representing the contents of the slot. The
221 : * copy needs to be palloc'd in the current memory context. The slot
222 : * itself is expected to remain unaffected. It is *not* expected to have
223 : * meaningful "system columns" in the copy. The copy is not be "owned" by
224 : * the slot i.e. the caller has to take responsibility to free memory
225 : * consumed by the slot.
226 : */
227 : HeapTuple (*copy_heap_tuple) (TupleTableSlot *slot);
228 :
229 : /*
230 : * Return a copy of minimal tuple representing the contents of the slot.
231 : * The copy needs to be palloc'd in the current memory context. The slot
232 : * itself is expected to remain unaffected. It is *not* expected to have
233 : * meaningful "system columns" in the copy. The copy is not be "owned" by
234 : * the slot i.e. the caller has to take responsibility to free memory
235 : * consumed by the slot.
236 : *
237 : * The copy has "extra" bytes (maxaligned and zeroed) available before the
238 : * tuple, which is useful so that some callers may store extra data along
239 : * with the minimal tuple without the need for an additional allocation.
240 : */
241 : MinimalTuple (*copy_minimal_tuple) (TupleTableSlot *slot, Size extra);
242 : };
243 :
244 : /*
245 : * Predefined TupleTableSlotOps for various types of TupleTableSlotOps. The
246 : * same are used to identify the type of a given slot.
247 : */
248 : extern PGDLLIMPORT const TupleTableSlotOps TTSOpsVirtual;
249 : extern PGDLLIMPORT const TupleTableSlotOps TTSOpsHeapTuple;
250 : extern PGDLLIMPORT const TupleTableSlotOps TTSOpsMinimalTuple;
251 : extern PGDLLIMPORT const TupleTableSlotOps TTSOpsBufferHeapTuple;
252 :
253 : #define TTS_IS_VIRTUAL(slot) ((slot)->tts_ops == &TTSOpsVirtual)
254 : #define TTS_IS_HEAPTUPLE(slot) ((slot)->tts_ops == &TTSOpsHeapTuple)
255 : #define TTS_IS_MINIMALTUPLE(slot) ((slot)->tts_ops == &TTSOpsMinimalTuple)
256 : #define TTS_IS_BUFFERTUPLE(slot) ((slot)->tts_ops == &TTSOpsBufferHeapTuple)
257 :
258 :
259 : /*
260 : * Tuple table slot implementations.
261 : */
262 :
263 : typedef struct VirtualTupleTableSlot
264 : {
265 : pg_node_attr(abstract)
266 :
267 : TupleTableSlot base;
268 :
269 : char *data; /* data for materialized slots */
270 : } VirtualTupleTableSlot;
271 :
272 : typedef struct HeapTupleTableSlot
273 : {
274 : pg_node_attr(abstract)
275 :
276 : TupleTableSlot base;
277 :
278 : #define FIELDNO_HEAPTUPLETABLESLOT_TUPLE 1
279 : HeapTuple tuple; /* physical tuple */
280 : #define FIELDNO_HEAPTUPLETABLESLOT_OFF 2
281 : uint32 off; /* saved state for slot_deform_heap_tuple */
282 : HeapTupleData tupdata; /* optional workspace for storing tuple */
283 : } HeapTupleTableSlot;
284 :
285 : /* heap tuple residing in a buffer */
286 : typedef struct BufferHeapTupleTableSlot
287 : {
288 : pg_node_attr(abstract)
289 :
290 : HeapTupleTableSlot base;
291 :
292 : /*
293 : * If buffer is not InvalidBuffer, then the slot is holding a pin on the
294 : * indicated buffer page; drop the pin when we release the slot's
295 : * reference to that buffer. (TTS_FLAG_SHOULDFREE should not be set in
296 : * such a case, since presumably base.tuple is pointing into the buffer.)
297 : */
298 : Buffer buffer; /* tuple's buffer, or InvalidBuffer */
299 : } BufferHeapTupleTableSlot;
300 :
301 : typedef struct MinimalTupleTableSlot
302 : {
303 : pg_node_attr(abstract)
304 :
305 : TupleTableSlot base;
306 :
307 : /*
308 : * In a minimal slot tuple points at minhdr and the fields of that struct
309 : * are set correctly for access to the minimal tuple; in particular,
310 : * minhdr.t_data points MINIMAL_TUPLE_OFFSET bytes before mintuple. This
311 : * allows column extraction to treat the case identically to regular
312 : * physical tuples.
313 : */
314 : #define FIELDNO_MINIMALTUPLETABLESLOT_TUPLE 1
315 : HeapTuple tuple; /* tuple wrapper */
316 : MinimalTuple mintuple; /* minimal tuple, or NULL if none */
317 : HeapTupleData minhdr; /* workspace for minimal-tuple-only case */
318 : #define FIELDNO_MINIMALTUPLETABLESLOT_OFF 4
319 : uint32 off; /* saved state for slot_deform_heap_tuple */
320 : } MinimalTupleTableSlot;
321 :
322 : /*
323 : * TupIsNull -- is a TupleTableSlot empty?
324 : */
325 : #define TupIsNull(slot) \
326 : ((slot) == NULL || TTS_EMPTY(slot))
327 :
328 : /* in executor/execTuples.c */
329 : extern TupleTableSlot *MakeTupleTableSlot(TupleDesc tupleDesc,
330 : const TupleTableSlotOps *tts_ops,
331 : uint16 flags);
332 : extern TupleTableSlot *ExecAllocTableSlot(List **tupleTable, TupleDesc desc,
333 : const TupleTableSlotOps *tts_ops,
334 : uint16 flags);
335 : extern void ExecResetTupleTable(List *tupleTable, bool shouldFree);
336 : extern TupleTableSlot *MakeSingleTupleTableSlot(TupleDesc tupdesc,
337 : const TupleTableSlotOps *tts_ops);
338 : extern void ExecDropSingleTupleTableSlot(TupleTableSlot *slot);
339 : extern void ExecSetSlotDescriptor(TupleTableSlot *slot, TupleDesc tupdesc);
340 : extern TupleTableSlot *ExecStoreHeapTuple(HeapTuple tuple,
341 : TupleTableSlot *slot,
342 : bool shouldFree);
343 : extern void ExecForceStoreHeapTuple(HeapTuple tuple,
344 : TupleTableSlot *slot,
345 : bool shouldFree);
346 : extern TupleTableSlot *ExecStoreBufferHeapTuple(HeapTuple tuple,
347 : TupleTableSlot *slot,
348 : Buffer buffer);
349 : extern TupleTableSlot *ExecStorePinnedBufferHeapTuple(HeapTuple tuple,
350 : TupleTableSlot *slot,
351 : Buffer buffer);
352 : extern TupleTableSlot *ExecStoreMinimalTuple(MinimalTuple mtup,
353 : TupleTableSlot *slot,
354 : bool shouldFree);
355 : extern void ExecForceStoreMinimalTuple(MinimalTuple mtup, TupleTableSlot *slot,
356 : bool shouldFree);
357 : extern TupleTableSlot *ExecStoreVirtualTuple(TupleTableSlot *slot);
358 : extern TupleTableSlot *ExecStoreAllNullTuple(TupleTableSlot *slot);
359 : extern void ExecStoreHeapTupleDatum(Datum data, TupleTableSlot *slot);
360 : extern HeapTuple ExecFetchSlotHeapTuple(TupleTableSlot *slot, bool materialize, bool *shouldFree);
361 : extern MinimalTuple ExecFetchSlotMinimalTuple(TupleTableSlot *slot,
362 : bool *shouldFree);
363 : extern Datum ExecFetchSlotHeapTupleDatum(TupleTableSlot *slot);
364 : extern void slot_getmissingattrs(TupleTableSlot *slot, int startAttNum,
365 : int lastAttNum);
366 : extern void slot_getsomeattrs_int(TupleTableSlot *slot, int attnum);
367 :
368 :
369 : #ifndef FRONTEND
370 :
371 : /*
372 : * This function forces the entries of the slot's Datum/isnull arrays to be
373 : * valid at least up through the attnum'th entry.
374 : */
375 : static inline void
376 179606329 : slot_getsomeattrs(TupleTableSlot *slot, int attnum)
377 : {
378 : /* Populate slot with attributes up to 'attnum', if it's not already */
379 179606329 : if (slot->tts_nvalid < attnum)
380 134591705 : slot->tts_ops->getsomeattrs(slot, attnum);
381 179606329 : }
382 :
383 : /*
384 : * slot_getallattrs
385 : * This function forces all the entries of the slot's Datum/isnull
386 : * arrays to be valid. The caller may then extract data directly
387 : * from those arrays instead of using slot_getattr.
388 : */
389 : static inline void
390 10470402 : slot_getallattrs(TupleTableSlot *slot)
391 : {
392 10470402 : slot_getsomeattrs(slot, slot->tts_tupleDescriptor->natts);
393 10470402 : }
394 :
395 :
396 : /*
397 : * slot_attisnull
398 : *
399 : * Detect whether an attribute of the slot is null, without actually fetching
400 : * it.
401 : */
402 : static inline bool
403 7158867 : slot_attisnull(TupleTableSlot *slot, int attnum)
404 : {
405 : Assert(attnum > 0);
406 :
407 7158867 : if (attnum > slot->tts_nvalid)
408 5822885 : slot_getsomeattrs(slot, attnum);
409 :
410 7158867 : return slot->tts_isnull[attnum - 1];
411 : }
412 :
413 : /*
414 : * slot_getattr - fetch one attribute of the slot's contents.
415 : */
416 : static inline Datum
417 44038687 : slot_getattr(TupleTableSlot *slot, int attnum,
418 : bool *isnull)
419 : {
420 : Assert(attnum > 0);
421 :
422 44038687 : if (attnum > slot->tts_nvalid)
423 33237425 : slot_getsomeattrs(slot, attnum);
424 :
425 44038687 : *isnull = slot->tts_isnull[attnum - 1];
426 :
427 44038687 : return slot->tts_values[attnum - 1];
428 : }
429 :
430 : /*
431 : * slot_getsysattr - fetch a system attribute of the slot's current tuple.
432 : *
433 : * If the slot type does not contain system attributes, this will throw an
434 : * error. Hence before calling this function, callers should make sure that
435 : * the slot type is the one that supports system attributes.
436 : */
437 : static inline Datum
438 5455957 : slot_getsysattr(TupleTableSlot *slot, int attnum, bool *isnull)
439 : {
440 : Assert(attnum < 0); /* caller error */
441 :
442 5455957 : if (attnum == TableOidAttributeNumber)
443 : {
444 1968812 : *isnull = false;
445 1968812 : return ObjectIdGetDatum(slot->tts_tableOid);
446 : }
447 3487145 : else if (attnum == SelfItemPointerAttributeNumber)
448 : {
449 3414349 : *isnull = false;
450 3414349 : return PointerGetDatum(&slot->tts_tid);
451 : }
452 :
453 : /* Fetch the system attribute from the underlying tuple. */
454 72796 : return slot->tts_ops->getsysattr(slot, attnum, isnull);
455 : }
456 :
457 : /*
458 : * slot_is_current_xact_tuple - check if the slot's current tuple is created
459 : * by the current transaction.
460 : *
461 : * If the slot does not contain a storage tuple, this will throw an error.
462 : * Hence before calling this function, callers should make sure that the
463 : * slot type supports storage tuples and that there is currently one inside
464 : * the slot.
465 : */
466 : static inline bool
467 564 : slot_is_current_xact_tuple(TupleTableSlot *slot)
468 : {
469 564 : return slot->tts_ops->is_current_xact_tuple(slot);
470 : }
471 :
472 : /*
473 : * ExecClearTuple - clear the slot's contents
474 : */
475 : static inline TupleTableSlot *
476 105196829 : ExecClearTuple(TupleTableSlot *slot)
477 : {
478 105196829 : slot->tts_ops->clear(slot);
479 :
480 105196829 : return slot;
481 : }
482 :
483 : /* ExecMaterializeSlot - force a slot into the "materialized" state.
484 : *
485 : * This causes the slot's tuple to be a local copy not dependent on any
486 : * external storage (i.e. pointing into a Buffer, or having allocations in
487 : * another memory context).
488 : *
489 : * A typical use for this operation is to prepare a computed tuple for being
490 : * stored on disk. The original data may or may not be virtual, but in any
491 : * case we need a private copy for heap_insert to scribble on.
492 : */
493 : static inline void
494 9710659 : ExecMaterializeSlot(TupleTableSlot *slot)
495 : {
496 9710659 : slot->tts_ops->materialize(slot);
497 9710659 : }
498 :
499 : /*
500 : * ExecCopySlotHeapTuple - return HeapTuple allocated in caller's context
501 : */
502 : static inline HeapTuple
503 14961596 : ExecCopySlotHeapTuple(TupleTableSlot *slot)
504 : {
505 : Assert(!TTS_EMPTY(slot));
506 :
507 14961596 : return slot->tts_ops->copy_heap_tuple(slot);
508 : }
509 :
510 : /*
511 : * ExecCopySlotMinimalTuple - return MinimalTuple allocated in caller's context
512 : */
513 : static inline MinimalTuple
514 10835271 : ExecCopySlotMinimalTuple(TupleTableSlot *slot)
515 : {
516 10835271 : return slot->tts_ops->copy_minimal_tuple(slot, 0);
517 : }
518 :
519 : /*
520 : * ExecCopySlotMinimalTupleExtra - return MinimalTuple allocated in caller's
521 : * context, with extra bytes (maxaligned and zeroed) before the tuple for data
522 : * the caller wishes to store along with the tuple (without requiring the
523 : * caller to make an additional allocation).
524 : */
525 : static inline MinimalTuple
526 663018 : ExecCopySlotMinimalTupleExtra(TupleTableSlot *slot, Size extra)
527 : {
528 663018 : return slot->tts_ops->copy_minimal_tuple(slot, extra);
529 : }
530 :
531 : /*
532 : * ExecCopySlot - copy one slot's contents into another.
533 : *
534 : * If a source's system attributes are supposed to be accessed in the target
535 : * slot, the target slot and source slot types need to match.
536 : *
537 : * Currently, 'dstslot' and 'srcslot' must have the same number of attributes.
538 : * Future work could see this relaxed to allow the source to contain
539 : * additional attributes and have the code here only copy over the leading
540 : * attributes.
541 : */
542 : static inline TupleTableSlot *
543 7898253 : ExecCopySlot(TupleTableSlot *dstslot, TupleTableSlot *srcslot)
544 : {
545 : Assert(!TTS_EMPTY(srcslot));
546 : Assert(srcslot != dstslot);
547 : Assert(dstslot->tts_tupleDescriptor->natts ==
548 : srcslot->tts_tupleDescriptor->natts);
549 :
550 7898253 : dstslot->tts_ops->copyslot(dstslot, srcslot);
551 :
552 7898253 : return dstslot;
553 : }
554 :
555 : #endif /* FRONTEND */
556 :
557 : #endif /* TUPTABLE_H */
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