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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 : 177939992 : slot_getsomeattrs(TupleTableSlot *slot, int attnum)
377 : : {
378 : : /* Populate slot with attributes up to 'attnum', if it's not already */
379 [ + + ]: 177939992 : if (slot->tts_nvalid < attnum)
380 : 131842747 : slot->tts_ops->getsomeattrs(slot, attnum);
381 : 177939992 : }
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 : 9392587 : slot_getallattrs(TupleTableSlot *slot)
391 : : {
392 : 9392587 : slot_getsomeattrs(slot, slot->tts_tupleDescriptor->natts);
393 : 9392587 : }
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 : 7932227 : slot_attisnull(TupleTableSlot *slot, int attnum)
404 : : {
405 : : Assert(attnum > 0);
406 : :
407 [ + + ]: 7932227 : if (attnum > slot->tts_nvalid)
408 : 6493233 : slot_getsomeattrs(slot, attnum);
409 : :
410 : 7932227 : 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 : 48567734 : slot_getattr(TupleTableSlot *slot, int attnum,
418 : : bool *isnull)
419 : : {
420 : : Assert(attnum > 0);
421 : :
422 [ + + ]: 48567734 : if (attnum > slot->tts_nvalid)
423 : 35930763 : slot_getsomeattrs(slot, attnum);
424 : :
425 : 48567734 : *isnull = slot->tts_isnull[attnum - 1];
426 : :
427 : 48567734 : 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 : 6680051 : slot_getsysattr(TupleTableSlot *slot, int attnum, bool *isnull)
439 : : {
440 : : Assert(attnum < 0); /* caller error */
441 : :
442 [ + + ]: 6680051 : if (attnum == TableOidAttributeNumber)
443 : : {
444 : 1496912 : *isnull = false;
445 : 1496912 : return ObjectIdGetDatum(slot->tts_tableOid);
446 : : }
447 [ + + ]: 5183139 : else if (attnum == SelfItemPointerAttributeNumber)
448 : : {
449 : 5110316 : *isnull = false;
450 : 5110316 : return PointerGetDatum(&slot->tts_tid);
451 : : }
452 : :
453 : : /* Fetch the system attribute from the underlying tuple. */
454 : 72823 : 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 : 107494486 : ExecClearTuple(TupleTableSlot *slot)
477 : : {
478 : 107494486 : slot->tts_ops->clear(slot);
479 : :
480 : 107494486 : return slot;
481 : : }
482 : :
483 : : /*
484 : : * ExecMaterializeSlot - force a slot into the "materialized" state.
485 : : *
486 : : * This causes the slot's tuple to be a local copy not dependent on any
487 : : * external storage (i.e. pointing into a Buffer, or having allocations in
488 : : * another memory context).
489 : : *
490 : : * A typical use for this operation is to prepare a computed tuple for being
491 : : * stored on disk. The original data may or may not be virtual, but in any
492 : : * case we need a private copy for heap_insert to scribble on.
493 : : */
494 : : static inline void
495 : 14434328 : ExecMaterializeSlot(TupleTableSlot *slot)
496 : : {
497 : 14434328 : slot->tts_ops->materialize(slot);
498 : 14434328 : }
499 : :
500 : : /*
501 : : * ExecCopySlotHeapTuple - return HeapTuple allocated in caller's context
502 : : */
503 : : static inline HeapTuple
504 : 15634272 : ExecCopySlotHeapTuple(TupleTableSlot *slot)
505 : : {
506 : : Assert(!TTS_EMPTY(slot));
507 : :
508 : 15634272 : return slot->tts_ops->copy_heap_tuple(slot);
509 : : }
510 : :
511 : : /*
512 : : * ExecCopySlotMinimalTuple - return MinimalTuple allocated in caller's context
513 : : */
514 : : static inline MinimalTuple
515 : 10307861 : ExecCopySlotMinimalTuple(TupleTableSlot *slot)
516 : : {
517 : 10307861 : return slot->tts_ops->copy_minimal_tuple(slot, 0);
518 : : }
519 : :
520 : : /*
521 : : * ExecCopySlotMinimalTupleExtra - return MinimalTuple allocated in caller's
522 : : * context, with extra bytes (maxaligned and zeroed) before the tuple for data
523 : : * the caller wishes to store along with the tuple (without requiring the
524 : : * caller to make an additional allocation).
525 : : */
526 : : static inline MinimalTuple
527 : 710003 : ExecCopySlotMinimalTupleExtra(TupleTableSlot *slot, Size extra)
528 : : {
529 : 710003 : return slot->tts_ops->copy_minimal_tuple(slot, extra);
530 : : }
531 : :
532 : : /*
533 : : * ExecCopySlot - copy one slot's contents into another.
534 : : *
535 : : * If a source's system attributes are supposed to be accessed in the target
536 : : * slot, the target slot and source slot types need to match.
537 : : *
538 : : * Currently, 'dstslot' and 'srcslot' must have the same number of attributes.
539 : : * Future work could see this relaxed to allow the source to contain
540 : : * additional attributes and have the code here only copy over the leading
541 : : * attributes.
542 : : */
543 : : static inline TupleTableSlot *
544 : 8516634 : ExecCopySlot(TupleTableSlot *dstslot, TupleTableSlot *srcslot)
545 : : {
546 : : Assert(!TTS_EMPTY(srcslot));
547 : : Assert(srcslot != dstslot);
548 : : Assert(dstslot->tts_tupleDescriptor->natts ==
549 : : srcslot->tts_tupleDescriptor->natts);
550 : :
551 : 8516634 : dstslot->tts_ops->copyslot(dstslot, srcslot);
552 : :
553 : 8516634 : return dstslot;
554 : : }
555 : :
556 : : #endif /* FRONTEND */
557 : :
558 : : #endif /* TUPTABLE_H */
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