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1 : : /*-------------------------------------------------------------------------
2 : : * conflict.c
3 : : * Support routines for logging conflicts.
4 : : *
5 : : * Copyright (c) 2024-2026, PostgreSQL Global Development Group
6 : : *
7 : : * IDENTIFICATION
8 : : * src/backend/replication/logical/conflict.c
9 : : *
10 : : * This file contains the code for logging conflicts on the subscriber during
11 : : * logical replication.
12 : : *-------------------------------------------------------------------------
13 : : */
14 : :
15 : : #include "postgres.h"
16 : :
17 : : #include "access/commit_ts.h"
18 : : #include "access/tableam.h"
19 : : #include "executor/executor.h"
20 : : #include "pgstat.h"
21 : : #include "replication/conflict.h"
22 : : #include "replication/worker_internal.h"
23 : : #include "storage/lmgr.h"
24 : : #include "utils/lsyscache.h"
25 : :
26 : : static const char *const ConflictTypeNames[] = {
27 : : [CT_INSERT_EXISTS] = "insert_exists",
28 : : [CT_UPDATE_ORIGIN_DIFFERS] = "update_origin_differs",
29 : : [CT_UPDATE_EXISTS] = "update_exists",
30 : : [CT_UPDATE_MISSING] = "update_missing",
31 : : [CT_DELETE_ORIGIN_DIFFERS] = "delete_origin_differs",
32 : : [CT_UPDATE_DELETED] = "update_deleted",
33 : : [CT_DELETE_MISSING] = "delete_missing",
34 : : [CT_MULTIPLE_UNIQUE_CONFLICTS] = "multiple_unique_conflicts"
35 : : };
36 : :
37 : : static int errcode_apply_conflict(ConflictType type);
38 : : static void errdetail_apply_conflict(EState *estate,
39 : : ResultRelInfo *relinfo,
40 : : ConflictType type,
41 : : TupleTableSlot *searchslot,
42 : : TupleTableSlot *localslot,
43 : : TupleTableSlot *remoteslot,
44 : : Oid indexoid, TransactionId localxmin,
45 : : RepOriginId localorigin,
46 : : TimestampTz localts, StringInfo err_msg);
47 : : static void get_tuple_desc(EState *estate, ResultRelInfo *relinfo,
48 : : ConflictType type, char **key_desc,
49 : : TupleTableSlot *searchslot, char **search_desc,
50 : : TupleTableSlot *localslot, char **local_desc,
51 : : TupleTableSlot *remoteslot, char **remote_desc,
52 : : Oid indexoid);
53 : : static char *build_index_value_desc(EState *estate, Relation localrel,
54 : : TupleTableSlot *slot, Oid indexoid);
55 : :
56 : : /*
57 : : * Get the xmin and commit timestamp data (origin and timestamp) associated
58 : : * with the provided local row.
59 : : *
60 : : * Return true if the commit timestamp data was found, false otherwise.
61 : : */
62 : : bool
63 : 0 : GetTupleTransactionInfo(TupleTableSlot *localslot, TransactionId *xmin,
64 : : RepOriginId *localorigin, TimestampTz *localts)
65 : : {
66 : 0 : Datum xminDatum;
67 : 0 : bool isnull;
68 : :
69 : 0 : xminDatum = slot_getsysattr(localslot, MinTransactionIdAttributeNumber,
70 : : &isnull);
71 : 0 : *xmin = DatumGetTransactionId(xminDatum);
72 [ # # ]: 0 : Assert(!isnull);
73 : :
74 : : /*
75 : : * The commit timestamp data is not available if track_commit_timestamp is
76 : : * disabled.
77 : : */
78 [ # # ]: 0 : if (!track_commit_timestamp)
79 : : {
80 : 0 : *localorigin = InvalidRepOriginId;
81 : 0 : *localts = 0;
82 : 0 : return false;
83 : : }
84 : :
85 : 0 : return TransactionIdGetCommitTsData(*xmin, localts, localorigin);
86 : 0 : }
87 : :
88 : : /*
89 : : * This function is used to report a conflict while applying replication
90 : : * changes.
91 : : *
92 : : * 'searchslot' should contain the tuple used to search the local row to be
93 : : * updated or deleted.
94 : : *
95 : : * 'remoteslot' should contain the remote new tuple, if any.
96 : : *
97 : : * conflicttuples is a list of local rows that caused the conflict and the
98 : : * conflict related information. See ConflictTupleInfo.
99 : : *
100 : : * The caller must ensure that all the indexes passed in ConflictTupleInfo are
101 : : * locked so that we can fetch and display the conflicting key values.
102 : : */
103 : : void
104 : 0 : ReportApplyConflict(EState *estate, ResultRelInfo *relinfo, int elevel,
105 : : ConflictType type, TupleTableSlot *searchslot,
106 : : TupleTableSlot *remoteslot, List *conflicttuples)
107 : : {
108 : 0 : Relation localrel = relinfo->ri_RelationDesc;
109 : 0 : StringInfoData err_detail;
110 : :
111 : 0 : initStringInfo(&err_detail);
112 : :
113 : : /* Form errdetail message by combining conflicting tuples information. */
114 [ # # # # : 0 : foreach_ptr(ConflictTupleInfo, conflicttuple, conflicttuples)
# # # # ]
115 : 0 : errdetail_apply_conflict(estate, relinfo, type, searchslot,
116 : 0 : conflicttuple->slot, remoteslot,
117 : 0 : conflicttuple->indexoid,
118 : 0 : conflicttuple->xmin,
119 : 0 : conflicttuple->origin,
120 : 0 : conflicttuple->ts,
121 : 0 : &err_detail);
122 : :
123 : 0 : pgstat_report_subscription_conflict(MySubscription->oid, type);
124 : :
125 [ # # # # : 0 : ereport(elevel,
# # # # #
# ]
126 : : errcode_apply_conflict(type),
127 : : errmsg("conflict detected on relation \"%s.%s\": conflict=%s",
128 : : get_namespace_name(RelationGetNamespace(localrel)),
129 : : RelationGetRelationName(localrel),
130 : : ConflictTypeNames[type]),
131 : : errdetail_internal("%s", err_detail.data));
132 : 0 : }
133 : :
134 : : /*
135 : : * Find all unique indexes to check for a conflict and store them into
136 : : * ResultRelInfo.
137 : : */
138 : : void
139 : 0 : InitConflictIndexes(ResultRelInfo *relInfo)
140 : : {
141 : 0 : List *uniqueIndexes = NIL;
142 : :
143 [ # # ]: 0 : for (int i = 0; i < relInfo->ri_NumIndices; i++)
144 : : {
145 : 0 : Relation indexRelation = relInfo->ri_IndexRelationDescs[i];
146 : :
147 [ # # ]: 0 : if (indexRelation == NULL)
148 : 0 : continue;
149 : :
150 : : /* Detect conflict only for unique indexes */
151 [ # # ]: 0 : if (!relInfo->ri_IndexRelationInfo[i]->ii_Unique)
152 : 0 : continue;
153 : :
154 : : /* Don't support conflict detection for deferrable index */
155 [ # # ]: 0 : if (!indexRelation->rd_index->indimmediate)
156 : 0 : continue;
157 : :
158 : 0 : uniqueIndexes = lappend_oid(uniqueIndexes,
159 : 0 : RelationGetRelid(indexRelation));
160 [ # # # ]: 0 : }
161 : :
162 : 0 : relInfo->ri_onConflictArbiterIndexes = uniqueIndexes;
163 : 0 : }
164 : :
165 : : /*
166 : : * Add SQLSTATE error code to the current conflict report.
167 : : */
168 : : static int
169 : 0 : errcode_apply_conflict(ConflictType type)
170 : : {
171 [ # # # ]: 0 : switch (type)
172 : : {
173 : : case CT_INSERT_EXISTS:
174 : : case CT_UPDATE_EXISTS:
175 : : case CT_MULTIPLE_UNIQUE_CONFLICTS:
176 : 0 : return errcode(ERRCODE_UNIQUE_VIOLATION);
177 : : case CT_UPDATE_ORIGIN_DIFFERS:
178 : : case CT_UPDATE_MISSING:
179 : : case CT_DELETE_ORIGIN_DIFFERS:
180 : : case CT_UPDATE_DELETED:
181 : : case CT_DELETE_MISSING:
182 : 0 : return errcode(ERRCODE_T_R_SERIALIZATION_FAILURE);
183 : : }
184 : :
185 : 0 : Assert(false);
186 : 0 : return 0; /* silence compiler warning */
187 : 0 : }
188 : :
189 : : /*
190 : : * Helper function to build the additional details for conflicting key,
191 : : * local row, remote row, and replica identity columns.
192 : : */
193 : : static void
194 : 0 : append_tuple_value_detail(StringInfo buf, List *tuple_values,
195 : : bool need_newline)
196 : : {
197 : 0 : bool first = true;
198 : :
199 [ # # ]: 0 : Assert(buf != NULL && tuple_values != NIL);
200 : :
201 [ # # # # : 0 : foreach_ptr(char, tuple_value, tuple_values)
# # # # ]
202 : : {
203 : : /*
204 : : * Skip if the value is NULL. This means the current user does not
205 : : * have enough permissions to see all columns in the table. See
206 : : * get_tuple_desc().
207 : : */
208 [ # # ]: 0 : if (!tuple_value)
209 : 0 : continue;
210 : :
211 [ # # ]: 0 : if (first)
212 : : {
213 : : /*
214 : : * translator: The colon is used as a separator in conflict
215 : : * messages. The first part, built in the caller, describes what
216 : : * happened locally; the second part lists the conflicting keys
217 : : * and tuple data.
218 : : */
219 : 0 : appendStringInfoString(buf, _(": "));
220 : 0 : }
221 : : else
222 : : {
223 : : /*
224 : : * translator: This is a separator in a list of conflicting keys
225 : : * and tuple data.
226 : : */
227 : 0 : appendStringInfoString(buf, _(", "));
228 : : }
229 : :
230 : 0 : appendStringInfoString(buf, tuple_value);
231 : 0 : first = false;
232 : 0 : }
233 : :
234 : : /* translator: This is the terminator of a conflict message */
235 : 0 : appendStringInfoString(buf, _("."));
236 : :
237 [ # # ]: 0 : if (need_newline)
238 : 0 : appendStringInfoChar(buf, '\n');
239 : 0 : }
240 : :
241 : : /*
242 : : * Add an errdetail() line showing conflict detail.
243 : : *
244 : : * The DETAIL line comprises of two parts:
245 : : * 1. Explanation of the conflict type, including the origin and commit
246 : : * timestamp of the local row.
247 : : * 2. Display of conflicting key, local row, remote new row, and replica
248 : : * identity columns, if any. The remote old row is excluded as its
249 : : * information is covered in the replica identity columns.
250 : : */
251 : : static void
252 : 0 : errdetail_apply_conflict(EState *estate, ResultRelInfo *relinfo,
253 : : ConflictType type, TupleTableSlot *searchslot,
254 : : TupleTableSlot *localslot, TupleTableSlot *remoteslot,
255 : : Oid indexoid, TransactionId localxmin,
256 : : RepOriginId localorigin, TimestampTz localts,
257 : : StringInfo err_msg)
258 : : {
259 : 0 : StringInfoData err_detail;
260 : 0 : char *origin_name;
261 : 0 : char *key_desc = NULL;
262 : 0 : char *local_desc = NULL;
263 : 0 : char *remote_desc = NULL;
264 : 0 : char *search_desc = NULL;
265 : :
266 : : /* Get key, replica identity, remote, and local value data */
267 : 0 : get_tuple_desc(estate, relinfo, type, &key_desc,
268 : 0 : localslot, &local_desc,
269 : 0 : remoteslot, &remote_desc,
270 : 0 : searchslot, &search_desc,
271 : 0 : indexoid);
272 : :
273 : 0 : initStringInfo(&err_detail);
274 : :
275 : : /* Construct a detailed message describing the type of conflict */
276 [ # # # # : 0 : switch (type)
# # # ]
277 : : {
278 : : case CT_INSERT_EXISTS:
279 : : case CT_UPDATE_EXISTS:
280 : : case CT_MULTIPLE_UNIQUE_CONFLICTS:
281 [ # # ]: 0 : Assert(OidIsValid(indexoid) &&
282 : : CheckRelationOidLockedByMe(indexoid, RowExclusiveLock, true));
283 : :
284 [ # # ]: 0 : if (err_msg->len == 0)
285 : : {
286 : 0 : appendStringInfoString(&err_detail, _("Could not apply remote change"));
287 : :
288 : 0 : append_tuple_value_detail(&err_detail,
289 : 0 : list_make2(remote_desc, search_desc),
290 : : true);
291 : 0 : }
292 : :
293 [ # # ]: 0 : if (localts)
294 : : {
295 [ # # ]: 0 : if (localorigin == InvalidRepOriginId)
296 : 0 : appendStringInfo(&err_detail, _("Key already exists in unique index \"%s\", modified locally in transaction %u at %s"),
297 : 0 : get_rel_name(indexoid),
298 : 0 : localxmin, timestamptz_to_str(localts));
299 [ # # ]: 0 : else if (replorigin_by_oid(localorigin, true, &origin_name))
300 : 0 : appendStringInfo(&err_detail, _("Key already exists in unique index \"%s\", modified by origin \"%s\" in transaction %u at %s"),
301 : 0 : get_rel_name(indexoid), origin_name,
302 : 0 : localxmin, timestamptz_to_str(localts));
303 : :
304 : : /*
305 : : * The origin that modified this row has been removed. This
306 : : * can happen if the origin was created by a different apply
307 : : * worker and its associated subscription and origin were
308 : : * dropped after updating the row, or if the origin was
309 : : * manually dropped by the user.
310 : : */
311 : : else
312 : 0 : appendStringInfo(&err_detail, _("Key already exists in unique index \"%s\", modified by a non-existent origin in transaction %u at %s"),
313 : 0 : get_rel_name(indexoid),
314 : 0 : localxmin, timestamptz_to_str(localts));
315 : 0 : }
316 : : else
317 : 0 : appendStringInfo(&err_detail, _("Key already exists in unique index \"%s\", modified in transaction %u"),
318 : 0 : get_rel_name(indexoid), localxmin);
319 : :
320 : 0 : append_tuple_value_detail(&err_detail,
321 : 0 : list_make2(key_desc, local_desc), false);
322 : :
323 : 0 : break;
324 : :
325 : : case CT_UPDATE_ORIGIN_DIFFERS:
326 [ # # ]: 0 : if (localorigin == InvalidRepOriginId)
327 : 0 : appendStringInfo(&err_detail, _("Updating the row that was modified locally in transaction %u at %s"),
328 : 0 : localxmin, timestamptz_to_str(localts));
329 [ # # ]: 0 : else if (replorigin_by_oid(localorigin, true, &origin_name))
330 : 0 : appendStringInfo(&err_detail, _("Updating the row that was modified by a different origin \"%s\" in transaction %u at %s"),
331 : 0 : origin_name, localxmin, timestamptz_to_str(localts));
332 : :
333 : : /* The origin that modified this row has been removed. */
334 : : else
335 : 0 : appendStringInfo(&err_detail, _("Updating the row that was modified by a non-existent origin in transaction %u at %s"),
336 : 0 : localxmin, timestamptz_to_str(localts));
337 : :
338 : 0 : append_tuple_value_detail(&err_detail,
339 : 0 : list_make3(local_desc, remote_desc,
340 : : search_desc), false);
341 : :
342 : 0 : break;
343 : :
344 : : case CT_UPDATE_DELETED:
345 : 0 : appendStringInfoString(&err_detail, _("Could not find the row to be updated"));
346 : :
347 : 0 : append_tuple_value_detail(&err_detail,
348 : 0 : list_make2(remote_desc, search_desc),
349 : : true);
350 : :
351 [ # # ]: 0 : if (localts)
352 : : {
353 [ # # ]: 0 : if (localorigin == InvalidRepOriginId)
354 : 0 : appendStringInfo(&err_detail, _("The row to be updated was deleted locally in transaction %u at %s"),
355 : 0 : localxmin, timestamptz_to_str(localts));
356 [ # # ]: 0 : else if (replorigin_by_oid(localorigin, true, &origin_name))
357 : 0 : appendStringInfo(&err_detail, _("The row to be updated was deleted by a different origin \"%s\" in transaction %u at %s"),
358 : 0 : origin_name, localxmin, timestamptz_to_str(localts));
359 : :
360 : : /* The origin that modified this row has been removed. */
361 : : else
362 : 0 : appendStringInfo(&err_detail, _("The row to be updated was deleted by a non-existent origin in transaction %u at %s"),
363 : 0 : localxmin, timestamptz_to_str(localts));
364 : 0 : }
365 : : else
366 : 0 : appendStringInfo(&err_detail, _("The row to be updated was deleted"));
367 : :
368 : 0 : break;
369 : :
370 : : case CT_UPDATE_MISSING:
371 : 0 : appendStringInfoString(&err_detail, _("Could not find the row to be updated"));
372 : :
373 : 0 : append_tuple_value_detail(&err_detail,
374 : 0 : list_make2(remote_desc, search_desc),
375 : : false);
376 : :
377 : 0 : break;
378 : :
379 : : case CT_DELETE_ORIGIN_DIFFERS:
380 [ # # ]: 0 : if (localorigin == InvalidRepOriginId)
381 : 0 : appendStringInfo(&err_detail, _("Deleting the row that was modified locally in transaction %u at %s"),
382 : 0 : localxmin, timestamptz_to_str(localts));
383 [ # # ]: 0 : else if (replorigin_by_oid(localorigin, true, &origin_name))
384 : 0 : appendStringInfo(&err_detail, _("Deleting the row that was modified by a different origin \"%s\" in transaction %u at %s"),
385 : 0 : origin_name, localxmin, timestamptz_to_str(localts));
386 : :
387 : : /* The origin that modified this row has been removed. */
388 : : else
389 : 0 : appendStringInfo(&err_detail, _("Deleting the row that was modified by a non-existent origin in transaction %u at %s"),
390 : 0 : localxmin, timestamptz_to_str(localts));
391 : :
392 : 0 : append_tuple_value_detail(&err_detail,
393 : 0 : list_make3(local_desc, remote_desc,
394 : : search_desc), false);
395 : :
396 : 0 : break;
397 : :
398 : : case CT_DELETE_MISSING:
399 : 0 : appendStringInfoString(&err_detail, _("Could not find the row to be deleted"));
400 : :
401 : 0 : append_tuple_value_detail(&err_detail,
402 : 0 : list_make1(search_desc), false);
403 : :
404 : 0 : break;
405 : : }
406 : :
407 [ # # ]: 0 : Assert(err_detail.len > 0);
408 : :
409 : : /*
410 : : * Insert a blank line to visually separate the new detail line from the
411 : : * existing ones.
412 : : */
413 [ # # ]: 0 : if (err_msg->len > 0)
414 : 0 : appendStringInfoChar(err_msg, '\n');
415 : :
416 : 0 : appendStringInfoString(err_msg, err_detail.data);
417 : 0 : }
418 : :
419 : : /*
420 : : * Extract conflicting key, local row, remote row, and replica identity
421 : : * columns. Results are set at xxx_desc.
422 : : *
423 : : * If the output is NULL, it indicates that the current user lacks permissions
424 : : * to view the columns involved.
425 : : */
426 : : static void
427 : 0 : get_tuple_desc(EState *estate, ResultRelInfo *relinfo, ConflictType type,
428 : : char **key_desc,
429 : : TupleTableSlot *localslot, char **local_desc,
430 : : TupleTableSlot *remoteslot, char **remote_desc,
431 : : TupleTableSlot *searchslot, char **search_desc,
432 : : Oid indexoid)
433 : : {
434 : 0 : Relation localrel = relinfo->ri_RelationDesc;
435 : 0 : Oid relid = RelationGetRelid(localrel);
436 : 0 : TupleDesc tupdesc = RelationGetDescr(localrel);
437 : 0 : char *desc = NULL;
438 : :
439 [ # # # # : 0 : Assert((localslot && local_desc) || (remoteslot && remote_desc) ||
# # # # ]
440 : : (searchslot && search_desc));
441 : :
442 : : /*
443 : : * Report the conflicting key values in the case of a unique constraint
444 : : * violation.
445 : : */
446 [ # # # # : 0 : if (type == CT_INSERT_EXISTS || type == CT_UPDATE_EXISTS ||
# # ]
447 : 0 : type == CT_MULTIPLE_UNIQUE_CONFLICTS)
448 : : {
449 [ # # ]: 0 : Assert(OidIsValid(indexoid) && localslot);
450 : :
451 : 0 : desc = build_index_value_desc(estate, localrel, localslot,
452 : 0 : indexoid);
453 : :
454 [ # # ]: 0 : if (desc)
455 : 0 : *key_desc = psprintf(_("key %s"), desc);
456 : 0 : }
457 : :
458 [ # # ]: 0 : if (localslot)
459 : : {
460 : : /*
461 : : * The 'modifiedCols' only applies to the new tuple, hence we pass
462 : : * NULL for the local row.
463 : : */
464 : 0 : desc = ExecBuildSlotValueDescription(relid, localslot, tupdesc,
465 : : NULL, 64);
466 : :
467 [ # # ]: 0 : if (desc)
468 : 0 : *local_desc = psprintf(_("local row %s"), desc);
469 : 0 : }
470 : :
471 [ # # ]: 0 : if (remoteslot)
472 : : {
473 : 0 : Bitmapset *modifiedCols;
474 : :
475 : : /*
476 : : * Although logical replication doesn't maintain the bitmap for the
477 : : * columns being inserted, we still use it to create 'modifiedCols'
478 : : * for consistency with other calls to ExecBuildSlotValueDescription.
479 : : *
480 : : * Note that generated columns are formed locally on the subscriber.
481 : : */
482 : 0 : modifiedCols = bms_union(ExecGetInsertedCols(relinfo, estate),
483 : 0 : ExecGetUpdatedCols(relinfo, estate));
484 : 0 : desc = ExecBuildSlotValueDescription(relid, remoteslot,
485 : 0 : tupdesc, modifiedCols,
486 : : 64);
487 : :
488 [ # # ]: 0 : if (desc)
489 : 0 : *remote_desc = psprintf(_("remote row %s"), desc);
490 : 0 : }
491 : :
492 [ # # ]: 0 : if (searchslot)
493 : : {
494 : : /*
495 : : * Note that while index other than replica identity may be used (see
496 : : * IsIndexUsableForReplicaIdentityFull for details) to find the tuple
497 : : * when applying update or delete, such an index scan may not result
498 : : * in a unique tuple and we still compare the complete tuple in such
499 : : * cases, thus such indexes are not used here.
500 : : */
501 : 0 : Oid replica_index = GetRelationIdentityOrPK(localrel);
502 : :
503 [ # # ]: 0 : Assert(type != CT_INSERT_EXISTS);
504 : :
505 : : /*
506 : : * If the table has a valid replica identity index, build the index
507 : : * key value string. Otherwise, construct the full tuple value for
508 : : * REPLICA IDENTITY FULL cases.
509 : : */
510 [ # # ]: 0 : if (OidIsValid(replica_index))
511 : 0 : desc = build_index_value_desc(estate, localrel, searchslot, replica_index);
512 : : else
513 : 0 : desc = ExecBuildSlotValueDescription(relid, searchslot, tupdesc, NULL, 64);
514 : :
515 [ # # ]: 0 : if (desc)
516 : : {
517 [ # # ]: 0 : if (OidIsValid(replica_index))
518 : 0 : *search_desc = psprintf(_("replica identity %s"), desc);
519 : : else
520 : 0 : *search_desc = psprintf(_("replica identity full %s"), desc);
521 : 0 : }
522 : 0 : }
523 : 0 : }
524 : :
525 : : /*
526 : : * Helper functions to construct a string describing the contents of an index
527 : : * entry. See BuildIndexValueDescription for details.
528 : : *
529 : : * The caller must ensure that the index with the OID 'indexoid' is locked so
530 : : * that we can fetch and display the conflicting key value.
531 : : */
532 : : static char *
533 : 0 : build_index_value_desc(EState *estate, Relation localrel, TupleTableSlot *slot,
534 : : Oid indexoid)
535 : : {
536 : 0 : char *index_value;
537 : 0 : Relation indexDesc;
538 : 0 : Datum values[INDEX_MAX_KEYS];
539 : 0 : bool isnull[INDEX_MAX_KEYS];
540 : 0 : TupleTableSlot *tableslot = slot;
541 : :
542 [ # # ]: 0 : if (!tableslot)
543 : 0 : return NULL;
544 : :
545 [ # # ]: 0 : Assert(CheckRelationOidLockedByMe(indexoid, RowExclusiveLock, true));
546 : :
547 : 0 : indexDesc = index_open(indexoid, NoLock);
548 : :
549 : : /*
550 : : * If the slot is a virtual slot, copy it into a heap tuple slot as
551 : : * FormIndexDatum only works with heap tuple slots.
552 : : */
553 [ # # ]: 0 : if (TTS_IS_VIRTUAL(slot))
554 : : {
555 : 0 : tableslot = table_slot_create(localrel, &estate->es_tupleTable);
556 : 0 : tableslot = ExecCopySlot(tableslot, slot);
557 : 0 : }
558 : :
559 : : /*
560 : : * Initialize ecxt_scantuple for potential use in FormIndexDatum when
561 : : * index expressions are present.
562 : : */
563 [ # # ]: 0 : GetPerTupleExprContext(estate)->ecxt_scantuple = tableslot;
564 : :
565 : : /*
566 : : * The values/nulls arrays passed to BuildIndexValueDescription should be
567 : : * the results of FormIndexDatum, which are the "raw" input to the index
568 : : * AM.
569 : : */
570 : 0 : FormIndexDatum(BuildIndexInfo(indexDesc), tableslot, estate, values, isnull);
571 : :
572 : 0 : index_value = BuildIndexValueDescription(indexDesc, values, isnull);
573 : :
574 : 0 : index_close(indexDesc, NoLock);
575 : :
576 : 0 : return index_value;
577 : 0 : }
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