PostgreSQL Source Code git master
genam.c File Reference
#include "postgres.h"
#include "access/genam.h"
#include "access/heapam.h"
#include "access/relscan.h"
#include "access/tableam.h"
#include "access/transam.h"
#include "catalog/index.h"
#include "lib/stringinfo.h"
#include "miscadmin.h"
#include "storage/bufmgr.h"
#include "storage/procarray.h"
#include "utils/acl.h"
#include "utils/injection_point.h"
#include "utils/lsyscache.h"
#include "utils/rel.h"
#include "utils/rls.h"
#include "utils/ruleutils.h"
#include "utils/snapmgr.h"
Include dependency graph for genam.c:

Go to the source code of this file.

Functions

IndexScanDesc RelationGetIndexScan (Relation indexRelation, int nkeys, int norderbys)
 
void IndexScanEnd (IndexScanDesc scan)
 
char * BuildIndexValueDescription (Relation indexRelation, const Datum *values, const bool *isnull)
 
TransactionId index_compute_xid_horizon_for_tuples (Relation irel, Relation hrel, Buffer ibuf, OffsetNumber *itemnos, int nitems)
 
SysScanDesc systable_beginscan (Relation heapRelation, Oid indexId, bool indexOK, Snapshot snapshot, int nkeys, ScanKey key)
 
static void HandleConcurrentAbort ()
 
HeapTuple systable_getnext (SysScanDesc sysscan)
 
bool systable_recheck_tuple (SysScanDesc sysscan, HeapTuple tup)
 
void systable_endscan (SysScanDesc sysscan)
 
SysScanDesc systable_beginscan_ordered (Relation heapRelation, Relation indexRelation, Snapshot snapshot, int nkeys, ScanKey key)
 
HeapTuple systable_getnext_ordered (SysScanDesc sysscan, ScanDirection direction)
 
void systable_endscan_ordered (SysScanDesc sysscan)
 
void systable_inplace_update_begin (Relation relation, Oid indexId, bool indexOK, Snapshot snapshot, int nkeys, const ScanKeyData *key, HeapTuple *oldtupcopy, void **state)
 
void systable_inplace_update_finish (void *state, HeapTuple tuple)
 
void systable_inplace_update_cancel (void *state)
 

Function Documentation

◆ BuildIndexValueDescription()

char * BuildIndexValueDescription ( Relation  indexRelation,
const Datum values,
const bool *  isnull 
)

Definition at line 177 of file genam.c.

179{
181 Form_pg_index idxrec;
182 int indnkeyatts;
183 int i;
184 int keyno;
185 Oid indexrelid = RelationGetRelid(indexRelation);
186 Oid indrelid;
187 AclResult aclresult;
188
189 indnkeyatts = IndexRelationGetNumberOfKeyAttributes(indexRelation);
190
191 /*
192 * Check permissions- if the user does not have access to view all of the
193 * key columns then return NULL to avoid leaking data.
194 *
195 * First check if RLS is enabled for the relation. If so, return NULL to
196 * avoid leaking data.
197 *
198 * Next we need to check table-level SELECT access and then, if there is
199 * no access there, check column-level permissions.
200 */
201 idxrec = indexRelation->rd_index;
202 indrelid = idxrec->indrelid;
203 Assert(indexrelid == idxrec->indexrelid);
204
205 /* RLS check- if RLS is enabled then we don't return anything. */
206 if (check_enable_rls(indrelid, InvalidOid, true) == RLS_ENABLED)
207 return NULL;
208
209 /* Table-level SELECT is enough, if the user has it */
210 aclresult = pg_class_aclcheck(indrelid, GetUserId(), ACL_SELECT);
211 if (aclresult != ACLCHECK_OK)
212 {
213 /*
214 * No table-level access, so step through the columns in the index and
215 * make sure the user has SELECT rights on all of them.
216 */
217 for (keyno = 0; keyno < indnkeyatts; keyno++)
218 {
219 AttrNumber attnum = idxrec->indkey.values[keyno];
220
221 /*
222 * Note that if attnum == InvalidAttrNumber, then this is an index
223 * based on an expression and we return no detail rather than try
224 * to figure out what column(s) the expression includes and if the
225 * user has SELECT rights on them.
226 */
227 if (attnum == InvalidAttrNumber ||
230 {
231 /* No access, so clean up and return */
232 return NULL;
233 }
234 }
235 }
236
238 appendStringInfo(&buf, "(%s)=(",
239 pg_get_indexdef_columns(indexrelid, true));
240
241 for (i = 0; i < indnkeyatts; i++)
242 {
243 char *val;
244
245 if (isnull[i])
246 val = "null";
247 else
248 {
249 Oid foutoid;
250 bool typisvarlena;
251
252 /*
253 * The provided data is not necessarily of the type stored in the
254 * index; rather it is of the index opclass's input type. So look
255 * at rd_opcintype not the index tupdesc.
256 *
257 * Note: this is a bit shaky for opclasses that have pseudotype
258 * input types such as ANYARRAY or RECORD. Currently, the
259 * typoutput functions associated with the pseudotypes will work
260 * okay, but we might have to try harder in future.
261 */
262 getTypeOutputInfo(indexRelation->rd_opcintype[i],
263 &foutoid, &typisvarlena);
264 val = OidOutputFunctionCall(foutoid, values[i]);
265 }
266
267 if (i > 0)
270 }
271
273
274 return buf.data;
275}
AclResult
Definition: acl.h:182
@ ACLCHECK_OK
Definition: acl.h:183
AclResult pg_attribute_aclcheck(Oid table_oid, AttrNumber attnum, Oid roleid, AclMode mode)
Definition: aclchk.c:3836
AclResult pg_class_aclcheck(Oid table_oid, Oid roleid, AclMode mode)
Definition: aclchk.c:4007
int16 AttrNumber
Definition: attnum.h:21
#define InvalidAttrNumber
Definition: attnum.h:23
static Datum values[MAXATTR]
Definition: bootstrap.c:151
#define Assert(condition)
Definition: c.h:815
char * OidOutputFunctionCall(Oid functionId, Datum val)
Definition: fmgr.c:1763
long val
Definition: informix.c:689
int i
Definition: isn.c:72
void getTypeOutputInfo(Oid type, Oid *typOutput, bool *typIsVarlena)
Definition: lsyscache.c:2934
Oid GetUserId(void)
Definition: miscinit.c:517
#define ACL_SELECT
Definition: parsenodes.h:77
int16 attnum
Definition: pg_attribute.h:74
FormData_pg_index * Form_pg_index
Definition: pg_index.h:70
static char * buf
Definition: pg_test_fsync.c:72
#define InvalidOid
Definition: postgres_ext.h:37
unsigned int Oid
Definition: postgres_ext.h:32
#define RelationGetRelid(relation)
Definition: rel.h:512
#define IndexRelationGetNumberOfKeyAttributes(relation)
Definition: rel.h:531
int check_enable_rls(Oid relid, Oid checkAsUser, bool noError)
Definition: rls.c:52
@ RLS_ENABLED
Definition: rls.h:45
char * pg_get_indexdef_columns(Oid indexrelid, bool pretty)
Definition: ruleutils.c:1232
void appendStringInfo(StringInfo str, const char *fmt,...)
Definition: stringinfo.c:145
void appendStringInfoString(StringInfo str, const char *s)
Definition: stringinfo.c:230
void appendStringInfoChar(StringInfo str, char ch)
Definition: stringinfo.c:242
void initStringInfo(StringInfo str)
Definition: stringinfo.c:97
Oid * rd_opcintype
Definition: rel.h:208
Form_pg_index rd_index
Definition: rel.h:192

References ACL_SELECT, ACLCHECK_OK, appendStringInfo(), appendStringInfoChar(), appendStringInfoString(), Assert, attnum, buf, check_enable_rls(), getTypeOutputInfo(), GetUserId(), i, IndexRelationGetNumberOfKeyAttributes, initStringInfo(), InvalidAttrNumber, InvalidOid, OidOutputFunctionCall(), pg_attribute_aclcheck(), pg_class_aclcheck(), pg_get_indexdef_columns(), RelationData::rd_index, RelationData::rd_opcintype, RelationGetRelid, RLS_ENABLED, val, and values.

Referenced by _bt_check_unique(), build_index_value_desc(), check_exclusion_or_unique_constraint(), and comparetup_index_btree_tiebreak().

◆ HandleConcurrentAbort()

static void HandleConcurrentAbort ( )
inlinestatic

Definition at line 490 of file genam.c.

491{
496 (errcode(ERRCODE_TRANSACTION_ROLLBACK),
497 errmsg("transaction aborted during system catalog scan")));
498}
int errcode(int sqlerrcode)
Definition: elog.c:853
int errmsg(const char *fmt,...)
Definition: elog.c:1070
#define ERROR
Definition: elog.h:39
#define ereport(elevel,...)
Definition: elog.h:149
bool TransactionIdIsInProgress(TransactionId xid)
Definition: procarray.c:1402
bool TransactionIdDidCommit(TransactionId transactionId)
Definition: transam.c:126
#define TransactionIdIsValid(xid)
Definition: transam.h:41
TransactionId CheckXidAlive
Definition: xact.c:98

References CheckXidAlive, ereport, errcode(), errmsg(), ERROR, TransactionIdDidCommit(), TransactionIdIsInProgress(), and TransactionIdIsValid.

Referenced by systable_getnext(), systable_getnext_ordered(), and systable_recheck_tuple().

◆ index_compute_xid_horizon_for_tuples()

TransactionId index_compute_xid_horizon_for_tuples ( Relation  irel,
Relation  hrel,
Buffer  ibuf,
OffsetNumber itemnos,
int  nitems 
)

Definition at line 294 of file genam.c.

299{
300 TM_IndexDeleteOp delstate;
301 TransactionId snapshotConflictHorizon = InvalidTransactionId;
302 Page ipage = BufferGetPage(ibuf);
303 IndexTuple itup;
304
305 Assert(nitems > 0);
306
307 delstate.irel = irel;
308 delstate.iblknum = BufferGetBlockNumber(ibuf);
309 delstate.bottomup = false;
310 delstate.bottomupfreespace = 0;
311 delstate.ndeltids = 0;
312 delstate.deltids = palloc(nitems * sizeof(TM_IndexDelete));
313 delstate.status = palloc(nitems * sizeof(TM_IndexStatus));
314
315 /* identify what the index tuples about to be deleted point to */
316 for (int i = 0; i < nitems; i++)
317 {
318 OffsetNumber offnum = itemnos[i];
319 ItemId iitemid;
320
321 iitemid = PageGetItemId(ipage, offnum);
322 itup = (IndexTuple) PageGetItem(ipage, iitemid);
323
324 Assert(ItemIdIsDead(iitemid));
325
326 ItemPointerCopy(&itup->t_tid, &delstate.deltids[i].tid);
327 delstate.deltids[i].id = delstate.ndeltids;
328 delstate.status[i].idxoffnum = offnum;
329 delstate.status[i].knowndeletable = true; /* LP_DEAD-marked */
330 delstate.status[i].promising = false; /* unused */
331 delstate.status[i].freespace = 0; /* unused */
332
333 delstate.ndeltids++;
334 }
335
336 /* determine the actual xid horizon */
337 snapshotConflictHorizon = table_index_delete_tuples(hrel, &delstate);
338
339 /* assert tableam agrees that all items are deletable */
340 Assert(delstate.ndeltids == nitems);
341
342 pfree(delstate.deltids);
343 pfree(delstate.status);
344
345 return snapshotConflictHorizon;
346}
BlockNumber BufferGetBlockNumber(Buffer buffer)
Definition: bufmgr.c:3721
static Page BufferGetPage(Buffer buffer)
Definition: bufmgr.h:396
static Item PageGetItem(const PageData *page, const ItemIdData *itemId)
Definition: bufpage.h:354
static ItemId PageGetItemId(Page page, OffsetNumber offsetNumber)
Definition: bufpage.h:244
PageData * Page
Definition: bufpage.h:82
uint32 TransactionId
Definition: c.h:609
#define nitems(x)
Definition: indent.h:31
#define ItemIdIsDead(itemId)
Definition: itemid.h:113
static void ItemPointerCopy(const ItemPointerData *fromPointer, ItemPointerData *toPointer)
Definition: itemptr.h:172
IndexTupleData * IndexTuple
Definition: itup.h:53
void pfree(void *pointer)
Definition: mcxt.c:1521
void * palloc(Size size)
Definition: mcxt.c:1317
uint16 OffsetNumber
Definition: off.h:24
ItemPointerData t_tid
Definition: itup.h:37
TM_IndexStatus * status
Definition: tableam.h:255
int bottomupfreespace
Definition: tableam.h:250
Relation irel
Definition: tableam.h:247
TM_IndexDelete * deltids
Definition: tableam.h:254
BlockNumber iblknum
Definition: tableam.h:248
ItemPointerData tid
Definition: tableam.h:213
bool knowndeletable
Definition: tableam.h:220
bool promising
Definition: tableam.h:223
int16 freespace
Definition: tableam.h:224
OffsetNumber idxoffnum
Definition: tableam.h:219
static TransactionId table_index_delete_tuples(Relation rel, TM_IndexDeleteOp *delstate)
Definition: tableam.h:1362
#define InvalidTransactionId
Definition: transam.h:31

References Assert, TM_IndexDeleteOp::bottomup, TM_IndexDeleteOp::bottomupfreespace, BufferGetBlockNumber(), BufferGetPage(), TM_IndexDeleteOp::deltids, TM_IndexStatus::freespace, i, TM_IndexDeleteOp::iblknum, TM_IndexDelete::id, TM_IndexStatus::idxoffnum, InvalidTransactionId, TM_IndexDeleteOp::irel, ItemIdIsDead, ItemPointerCopy(), TM_IndexStatus::knowndeletable, TM_IndexDeleteOp::ndeltids, nitems, PageGetItem(), PageGetItemId(), palloc(), pfree(), TM_IndexStatus::promising, TM_IndexDeleteOp::status, IndexTupleData::t_tid, table_index_delete_tuples(), and TM_IndexDelete::tid.

Referenced by _hash_vacuum_one_page(), and gistprunepage().

◆ IndexScanEnd()

void IndexScanEnd ( IndexScanDesc  scan)

Definition at line 144 of file genam.c.

145{
146 if (scan->keyData != NULL)
147 pfree(scan->keyData);
148 if (scan->orderByData != NULL)
149 pfree(scan->orderByData);
150
151 pfree(scan);
152}
struct ScanKeyData * keyData
Definition: relscan.h:139
struct ScanKeyData * orderByData
Definition: relscan.h:140

References IndexScanDescData::keyData, IndexScanDescData::orderByData, and pfree().

Referenced by index_endscan().

◆ RelationGetIndexScan()

IndexScanDesc RelationGetIndexScan ( Relation  indexRelation,
int  nkeys,
int  norderbys 
)

Definition at line 80 of file genam.c.

81{
82 IndexScanDesc scan;
83
84 scan = (IndexScanDesc) palloc(sizeof(IndexScanDescData));
85
86 scan->heapRelation = NULL; /* may be set later */
87 scan->xs_heapfetch = NULL;
88 scan->indexRelation = indexRelation;
89 scan->xs_snapshot = InvalidSnapshot; /* caller must initialize this */
90 scan->numberOfKeys = nkeys;
91 scan->numberOfOrderBys = norderbys;
92
93 /*
94 * We allocate key workspace here, but it won't get filled until amrescan.
95 */
96 if (nkeys > 0)
97 scan->keyData = (ScanKey) palloc(sizeof(ScanKeyData) * nkeys);
98 else
99 scan->keyData = NULL;
100 if (norderbys > 0)
101 scan->orderByData = (ScanKey) palloc(sizeof(ScanKeyData) * norderbys);
102 else
103 scan->orderByData = NULL;
104
105 scan->xs_want_itup = false; /* may be set later */
106
107 /*
108 * During recovery we ignore killed tuples and don't bother to kill them
109 * either. We do this because the xmin on the primary node could easily be
110 * later than the xmin on the standby node, so that what the primary
111 * thinks is killed is supposed to be visible on standby. So for correct
112 * MVCC for queries during recovery we must ignore these hints and check
113 * all tuples. Do *not* set ignore_killed_tuples to true when running in a
114 * transaction that was started during recovery. xactStartedInRecovery
115 * should not be altered by index AMs.
116 */
117 scan->kill_prior_tuple = false;
120
121 scan->opaque = NULL;
122
123 scan->xs_itup = NULL;
124 scan->xs_itupdesc = NULL;
125 scan->xs_hitup = NULL;
126 scan->xs_hitupdesc = NULL;
127
128 return scan;
129}
struct IndexScanDescData * IndexScanDesc
Definition: genam.h:92
ScanKeyData * ScanKey
Definition: skey.h:75
#define InvalidSnapshot
Definition: snapshot.h:119
HeapTuple xs_hitup
Definition: relscan.h:161
bool ignore_killed_tuples
Definition: relscan.h:146
IndexFetchTableData * xs_heapfetch
Definition: relscan.h:167
int numberOfOrderBys
Definition: relscan.h:138
bool xactStartedInRecovery
Definition: relscan.h:147
IndexTuple xs_itup
Definition: relscan.h:159
bool kill_prior_tuple
Definition: relscan.h:145
struct TupleDescData * xs_hitupdesc
Definition: relscan.h:162
struct TupleDescData * xs_itupdesc
Definition: relscan.h:160
Relation indexRelation
Definition: relscan.h:135
struct SnapshotData * xs_snapshot
Definition: relscan.h:136
Relation heapRelation
Definition: relscan.h:134
bool TransactionStartedDuringRecovery(void)
Definition: xact.c:1041

References IndexScanDescData::heapRelation, IndexScanDescData::ignore_killed_tuples, IndexScanDescData::indexRelation, InvalidSnapshot, IndexScanDescData::keyData, IndexScanDescData::kill_prior_tuple, IndexScanDescData::numberOfKeys, IndexScanDescData::numberOfOrderBys, IndexScanDescData::opaque, IndexScanDescData::orderByData, palloc(), TransactionStartedDuringRecovery(), IndexScanDescData::xactStartedInRecovery, IndexScanDescData::xs_heapfetch, IndexScanDescData::xs_hitup, IndexScanDescData::xs_hitupdesc, IndexScanDescData::xs_itup, IndexScanDescData::xs_itupdesc, IndexScanDescData::xs_snapshot, and IndexScanDescData::xs_want_itup.

Referenced by blbeginscan(), brinbeginscan(), btbeginscan(), dibeginscan(), ginbeginscan(), gistbeginscan(), hashbeginscan(), and spgbeginscan().

◆ systable_beginscan()

SysScanDesc systable_beginscan ( Relation  heapRelation,
Oid  indexId,
bool  indexOK,
Snapshot  snapshot,
int  nkeys,
ScanKey  key 
)

Definition at line 387 of file genam.c.

392{
393 SysScanDesc sysscan;
394 Relation irel;
395
396 if (indexOK &&
398 !ReindexIsProcessingIndex(indexId))
399 irel = index_open(indexId, AccessShareLock);
400 else
401 irel = NULL;
402
403 sysscan = (SysScanDesc) palloc(sizeof(SysScanDescData));
404
405 sysscan->heap_rel = heapRelation;
406 sysscan->irel = irel;
407 sysscan->slot = table_slot_create(heapRelation, NULL);
408
409 if (snapshot == NULL)
410 {
411 Oid relid = RelationGetRelid(heapRelation);
412
413 snapshot = RegisterSnapshot(GetCatalogSnapshot(relid));
414 sysscan->snapshot = snapshot;
415 }
416 else
417 {
418 /* Caller is responsible for any snapshot. */
419 sysscan->snapshot = NULL;
420 }
421
422 if (irel)
423 {
424 int i;
425 ScanKey idxkey;
426
427 idxkey = palloc_array(ScanKeyData, nkeys);
428
429 /* Convert attribute numbers to be index column numbers. */
430 for (i = 0; i < nkeys; i++)
431 {
432 int j;
433
434 memcpy(&idxkey[i], &key[i], sizeof(ScanKeyData));
435
436 for (j = 0; j < IndexRelationGetNumberOfAttributes(irel); j++)
437 {
438 if (key[i].sk_attno == irel->rd_index->indkey.values[j])
439 {
440 idxkey[i].sk_attno = j + 1;
441 break;
442 }
443 }
445 elog(ERROR, "column is not in index");
446 }
447
448 sysscan->iscan = index_beginscan(heapRelation, irel,
449 snapshot, nkeys, 0);
450 index_rescan(sysscan->iscan, idxkey, nkeys, NULL, 0);
451 sysscan->scan = NULL;
452
453 pfree(idxkey);
454 }
455 else
456 {
457 /*
458 * We disallow synchronized scans when forced to use a heapscan on a
459 * catalog. In most cases the desired rows are near the front, so
460 * that the unpredictable start point of a syncscan is a serious
461 * disadvantage; and there are no compensating advantages, because
462 * it's unlikely that such scans will occur in parallel.
463 */
464 sysscan->scan = table_beginscan_strat(heapRelation, snapshot,
465 nkeys, key,
466 true, false);
467 sysscan->iscan = NULL;
468 }
469
470 /*
471 * If CheckXidAlive is set then set a flag to indicate that system table
472 * scan is in-progress. See detailed comments in xact.c where these
473 * variables are declared.
474 */
476 bsysscan = true;
477
478 return sysscan;
479}
#define elog(elevel,...)
Definition: elog.h:225
#define palloc_array(type, count)
Definition: fe_memutils.h:76
struct SysScanDescData * SysScanDesc
Definition: genam.h:93
bool ReindexIsProcessingIndex(Oid indexOid)
Definition: index.c:4113
IndexScanDesc index_beginscan(Relation heapRelation, Relation indexRelation, Snapshot snapshot, int nkeys, int norderbys)
Definition: indexam.c:256
Relation index_open(Oid relationId, LOCKMODE lockmode)
Definition: indexam.c:133
void index_rescan(IndexScanDesc scan, ScanKey keys, int nkeys, ScanKey orderbys, int norderbys)
Definition: indexam.c:352
int j
Definition: isn.c:73
#define AccessShareLock
Definition: lockdefs.h:36
bool IgnoreSystemIndexes
Definition: miscinit.c:81
#define IndexRelationGetNumberOfAttributes(relation)
Definition: rel.h:524
Snapshot GetCatalogSnapshot(Oid relid)
Definition: snapmgr.c:314
Snapshot RegisterSnapshot(Snapshot snapshot)
Definition: snapmgr.c:752
AttrNumber sk_attno
Definition: skey.h:67
Relation irel
Definition: relscan.h:201
Relation heap_rel
Definition: relscan.h:200
struct SnapshotData * snapshot
Definition: relscan.h:204
struct IndexScanDescData * iscan
Definition: relscan.h:203
struct TupleTableSlot * slot
Definition: relscan.h:205
struct TableScanDescData * scan
Definition: relscan.h:202
TupleTableSlot * table_slot_create(Relation relation, List **reglist)
Definition: tableam.c:91
static TableScanDesc table_beginscan_strat(Relation rel, Snapshot snapshot, int nkeys, struct ScanKeyData *key, bool allow_strat, bool allow_sync)
Definition: tableam.h:937
bool bsysscan
Definition: xact.c:99

References AccessShareLock, bsysscan, CheckXidAlive, elog, ERROR, GetCatalogSnapshot(), SysScanDescData::heap_rel, i, IgnoreSystemIndexes, index_beginscan(), index_open(), index_rescan(), IndexRelationGetNumberOfAttributes, SysScanDescData::irel, SysScanDescData::iscan, j, sort-test::key, palloc(), palloc_array, pfree(), RelationData::rd_index, RegisterSnapshot(), ReindexIsProcessingIndex(), RelationGetRelid, SysScanDescData::scan, ScanKeyData::sk_attno, SysScanDescData::slot, SysScanDescData::snapshot, table_beginscan_strat(), table_slot_create(), and TransactionIdIsValid.

Referenced by AfterTriggerSetState(), AlterConstraintNamespaces(), AlterConstrTriggerDeferrability(), AlterDatabase(), AlterDatabaseOwner(), AlterDatabaseRefreshColl(), AlterDomainDropConstraint(), AlterDomainValidateConstraint(), AlterExtensionNamespace(), AlterPolicy(), AlterSeqNamespaces(), AlterSetting(), AlterTypeRecurse(), ApplyExtensionUpdates(), ApplySetting(), ATExecAddOf(), ATExecAlterChildConstr(), ATExecAlterColumnType(), ATExecAlterConstraint(), ATExecAttachPartition(), ATExecDropConstraint(), ATExecValidateConstraint(), ATPrepChangePersistence(), AttrDefaultFetch(), change_owner_fix_column_acls(), change_owner_recurse_to_sequences(), changeDependenciesOf(), changeDependenciesOn(), changeDependencyFor(), CheckConstraintFetch(), checkSharedDependencies(), ChooseConstraintName(), CloneFkReferenced(), CloneRowTriggersToPartition(), ConstraintNameExists(), ConstraintNameIsUsed(), CopyStatistics(), copyTemplateDependencies(), CountDBSubscriptions(), CreateComments(), CreateInheritance(), CreatePolicy(), CreateSharedComments(), CreateTriggerFiringOn(), DefineOpClass(), DefineTSConfiguration(), DeleteAttributeTuples(), DeleteComments(), deleteDependencyRecordsFor(), deleteDependencyRecordsForClass(), deleteDependencyRecordsForSpecific(), DeleteInheritsTuple(), DeleteInitPrivs(), deleteOneObject(), DeleteSecurityLabel(), DeleteSharedComments(), DeleteSharedSecurityLabel(), DeleteSystemAttributeTuples(), drop_parent_dependency(), DropClonedTriggersFromPartition(), DropConfigurationMapping(), dropconstraint_internal(), dropDatabaseDependencies(), DropObjectById(), DropRole(), EnableDisableTrigger(), EnumValuesDelete(), exec_object_restorecon(), ExecAlterExtensionStmt(), ExecGrant_Largeobject(), extension_config_remove(), fetch_statentries_for_relation(), find_composite_type_dependencies(), find_inheritance_children_extended(), findDependentObjects(), findDomainNotNullConstraint(), findNotNullConstraintAttnum(), get_catalog_object_by_oid_extended(), get_database_oid(), get_db_info(), get_domain_constraint_oid(), get_index_constraint(), get_index_ref_constraints(), get_partition_parent_worker(), get_pkey_attnames(), get_primary_key_attnos(), get_relation_constraint_attnos(), get_relation_constraint_oid(), get_relation_idx_constraint_oid(), get_relation_policy_oid(), get_rels_with_domain(), get_trigger_oid(), GetAllTablesPublications(), GetAttrDefaultColumnAddress(), GetAttrDefaultOid(), getAutoExtensionsOfObject(), GetComment(), GetDatabaseTuple(), GetDatabaseTupleByOid(), GetDefaultOpClass(), getExtensionOfObject(), GetForeignKeyActionTriggers(), GetForeignKeyCheckTriggers(), GetNewOidWithIndex(), getObjectDescription(), getObjectIdentityParts(), getOwnedSequences_internal(), GetParentedForeignKeyRefs(), GetPublicationRelations(), GetPublicationSchemas(), GetSecurityLabel(), GetSharedSecurityLabel(), GetSubscriptionRelations(), has_superclass(), HasSubscriptionRelations(), heap_truncate_find_FKs(), index_concurrently_swap(), IndexSetParentIndex(), is_schema_publication(), LargeObjectDrop(), LargeObjectExistsWithSnapshot(), load_domaintype_info(), load_enum_cache_data(), LookupOpclassInfo(), makeConfigurationDependencies(), MakeConfigurationMapping(), MarkInheritDetached(), MergeConstraintsIntoExisting(), MergeWithExistingConstraint(), movedb(), object_ownercheck(), PartitionHasPendingDetach(), pg_extension_config_dump(), pg_get_constraintdef_worker(), pg_get_serial_sequence(), pg_get_triggerdef_worker(), pg_largeobject_aclmask_snapshot(), QueueFKConstraintValidation(), RangeDelete(), recordExtensionInitPrivWorker(), recordExtObjInitPriv(), relation_has_policies(), RelationBuildPartitionDesc(), RelationBuildRowSecurity(), RelationBuildRuleLock(), RelationBuildTriggers(), RelationBuildTupleDesc(), RelationGetExclusionInfo(), RelationGetFKeyList(), RelationGetIndexList(), RelationGetNotNullConstraints(), RelationGetStatExtList(), RelationRemoveInheritance(), RelidByRelfilenumber(), RememberAllDependentForRebuilding(), RemoveAttrDefault(), RemoveAttrDefaultById(), RemoveExtensionById(), RemoveInheritance(), RemovePolicyById(), RemoveRewriteRuleById(), RemoveRoleFromInitPriv(), RemoveRoleFromObjectACL(), RemoveRoleFromObjectPolicy(), RemoveStatistics(), RemoveTriggerById(), RemoveTSConfigurationById(), rename_policy(), renametrig(), renametrig_internal(), renametrig_partition(), ReplaceRoleInInitPriv(), replorigin_create(), ScanPgRelation(), SearchCatCacheList(), SearchCatCacheMiss(), sepgsql_attribute_post_create(), sepgsql_database_post_create(), sepgsql_proc_post_create(), sepgsql_proc_setattr(), sepgsql_relation_post_create(), sepgsql_relation_setattr(), sepgsql_relation_setattr_extra(), sepgsql_schema_post_create(), sequenceIsOwned(), SetSecurityLabel(), SetSharedSecurityLabel(), shdepChangeDep(), shdepDropDependency(), shdepDropOwned(), shdepReassignOwned(), systable_inplace_update_begin(), toastrel_valueid_exists(), TriggerSetParentTrigger(), tryAttachPartitionForeignKey(), typeInheritsFrom(), vac_update_datfrozenxid(), and validatePartitionedIndex().

◆ systable_beginscan_ordered()

SysScanDesc systable_beginscan_ordered ( Relation  heapRelation,
Relation  indexRelation,
Snapshot  snapshot,
int  nkeys,
ScanKey  key 
)

Definition at line 653 of file genam.c.

657{
658 SysScanDesc sysscan;
659 int i;
660 ScanKey idxkey;
661
662 /* REINDEX can probably be a hard error here ... */
663 if (ReindexIsProcessingIndex(RelationGetRelid(indexRelation)))
665 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
666 errmsg("cannot access index \"%s\" while it is being reindexed",
667 RelationGetRelationName(indexRelation))));
668 /* ... but we only throw a warning about violating IgnoreSystemIndexes */
670 elog(WARNING, "using index \"%s\" despite IgnoreSystemIndexes",
671 RelationGetRelationName(indexRelation));
672
673 sysscan = (SysScanDesc) palloc(sizeof(SysScanDescData));
674
675 sysscan->heap_rel = heapRelation;
676 sysscan->irel = indexRelation;
677 sysscan->slot = table_slot_create(heapRelation, NULL);
678
679 if (snapshot == NULL)
680 {
681 Oid relid = RelationGetRelid(heapRelation);
682
683 snapshot = RegisterSnapshot(GetCatalogSnapshot(relid));
684 sysscan->snapshot = snapshot;
685 }
686 else
687 {
688 /* Caller is responsible for any snapshot. */
689 sysscan->snapshot = NULL;
690 }
691
692 idxkey = palloc_array(ScanKeyData, nkeys);
693
694 /* Convert attribute numbers to be index column numbers. */
695 for (i = 0; i < nkeys; i++)
696 {
697 int j;
698
699 memcpy(&idxkey[i], &key[i], sizeof(ScanKeyData));
700
701 for (j = 0; j < IndexRelationGetNumberOfAttributes(indexRelation); j++)
702 {
703 if (key[i].sk_attno == indexRelation->rd_index->indkey.values[j])
704 {
705 idxkey[i].sk_attno = j + 1;
706 break;
707 }
708 }
709 if (j == IndexRelationGetNumberOfAttributes(indexRelation))
710 elog(ERROR, "column is not in index");
711 }
712
713 sysscan->iscan = index_beginscan(heapRelation, indexRelation,
714 snapshot, nkeys, 0);
715 index_rescan(sysscan->iscan, idxkey, nkeys, NULL, 0);
716 sysscan->scan = NULL;
717
718 pfree(idxkey);
719
720 /*
721 * If CheckXidAlive is set then set a flag to indicate that system table
722 * scan is in-progress. See detailed comments in xact.c where these
723 * variables are declared.
724 */
726 bsysscan = true;
727
728 return sysscan;
729}
#define WARNING
Definition: elog.h:36
#define RelationGetRelationName(relation)
Definition: rel.h:546

References bsysscan, CheckXidAlive, elog, ereport, errcode(), errmsg(), ERROR, GetCatalogSnapshot(), SysScanDescData::heap_rel, i, IgnoreSystemIndexes, index_beginscan(), index_rescan(), IndexRelationGetNumberOfAttributes, SysScanDescData::irel, SysScanDescData::iscan, j, sort-test::key, palloc(), palloc_array, pfree(), RelationData::rd_index, RegisterSnapshot(), ReindexIsProcessingIndex(), RelationGetRelationName, RelationGetRelid, SysScanDescData::scan, ScanKeyData::sk_attno, SysScanDescData::slot, SysScanDescData::snapshot, table_slot_create(), TransactionIdIsValid, and WARNING.

Referenced by BuildEventTriggerCache(), check_toasted_attribute(), enum_endpoint(), enum_range_internal(), heap_fetch_toast_slice(), inv_getsize(), inv_read(), inv_truncate(), inv_write(), lookup_ts_config_cache(), and toast_delete_datum().

◆ systable_endscan()

void systable_endscan ( SysScanDesc  sysscan)

Definition at line 606 of file genam.c.

607{
608 if (sysscan->slot)
609 {
611 sysscan->slot = NULL;
612 }
613
614 if (sysscan->irel)
615 {
616 index_endscan(sysscan->iscan);
618 }
619 else
620 table_endscan(sysscan->scan);
621
622 if (sysscan->snapshot)
624
625 /*
626 * Reset the bsysscan flag at the end of the systable scan. See detailed
627 * comments in xact.c where these variables are declared.
628 */
630 bsysscan = false;
631
632 pfree(sysscan);
633}
void ExecDropSingleTupleTableSlot(TupleTableSlot *slot)
Definition: execTuples.c:1441
void index_close(Relation relation, LOCKMODE lockmode)
Definition: indexam.c:177
void index_endscan(IndexScanDesc scan)
Definition: indexam.c:378
void UnregisterSnapshot(Snapshot snapshot)
Definition: snapmgr.c:794
static void table_endscan(TableScanDesc scan)
Definition: tableam.h:1025

References AccessShareLock, bsysscan, CheckXidAlive, ExecDropSingleTupleTableSlot(), index_close(), index_endscan(), SysScanDescData::irel, SysScanDescData::iscan, pfree(), SysScanDescData::scan, SysScanDescData::slot, SysScanDescData::snapshot, table_endscan(), TransactionIdIsValid, and UnregisterSnapshot().

Referenced by AfterTriggerSetState(), AlterConstraintNamespaces(), AlterConstrTriggerDeferrability(), AlterDatabase(), AlterDatabaseOwner(), AlterDatabaseRefreshColl(), AlterDomainDropConstraint(), AlterDomainValidateConstraint(), AlterExtensionNamespace(), AlterPolicy(), AlterSeqNamespaces(), AlterSetting(), AlterTypeRecurse(), ApplyExtensionUpdates(), ApplySetting(), ATExecAddOf(), ATExecAlterChildConstr(), ATExecAlterColumnType(), ATExecAlterConstraint(), ATExecAttachPartition(), ATExecDropConstraint(), ATExecValidateConstraint(), ATPrepChangePersistence(), AttrDefaultFetch(), change_owner_fix_column_acls(), change_owner_recurse_to_sequences(), changeDependenciesOf(), changeDependenciesOn(), changeDependencyFor(), CheckConstraintFetch(), checkSharedDependencies(), ChooseConstraintName(), CloneFkReferenced(), CloneRowTriggersToPartition(), ConstraintNameExists(), ConstraintNameIsUsed(), CopyStatistics(), copyTemplateDependencies(), CountDBSubscriptions(), CreateComments(), CreateInheritance(), CreatePolicy(), CreateSharedComments(), CreateTriggerFiringOn(), DefineOpClass(), DefineTSConfiguration(), DeleteAttributeTuples(), DeleteComments(), deleteDependencyRecordsFor(), deleteDependencyRecordsForClass(), deleteDependencyRecordsForSpecific(), DeleteInheritsTuple(), DeleteInitPrivs(), deleteOneObject(), DeleteSecurityLabel(), DeleteSharedComments(), DeleteSharedSecurityLabel(), DeleteSystemAttributeTuples(), drop_parent_dependency(), DropClonedTriggersFromPartition(), DropConfigurationMapping(), dropconstraint_internal(), dropDatabaseDependencies(), DropObjectById(), DropRole(), EnableDisableTrigger(), EnumValuesDelete(), exec_object_restorecon(), ExecAlterExtensionStmt(), ExecGrant_Largeobject(), extension_config_remove(), fetch_statentries_for_relation(), find_composite_type_dependencies(), find_inheritance_children_extended(), findDependentObjects(), findDomainNotNullConstraint(), findNotNullConstraintAttnum(), get_catalog_object_by_oid_extended(), get_database_oid(), get_db_info(), get_domain_constraint_oid(), get_index_constraint(), get_index_ref_constraints(), get_partition_parent_worker(), get_pkey_attnames(), get_primary_key_attnos(), get_relation_constraint_attnos(), get_relation_constraint_oid(), get_relation_idx_constraint_oid(), get_relation_policy_oid(), get_rels_with_domain(), get_trigger_oid(), GetAllTablesPublications(), GetAttrDefaultColumnAddress(), GetAttrDefaultOid(), getAutoExtensionsOfObject(), GetComment(), GetDatabaseTuple(), GetDatabaseTupleByOid(), GetDefaultOpClass(), getExtensionOfObject(), GetForeignKeyActionTriggers(), GetForeignKeyCheckTriggers(), GetNewOidWithIndex(), getObjectDescription(), getObjectIdentityParts(), getOwnedSequences_internal(), GetParentedForeignKeyRefs(), GetPublicationRelations(), GetPublicationSchemas(), GetSecurityLabel(), GetSharedSecurityLabel(), GetSubscriptionRelations(), has_superclass(), HasSubscriptionRelations(), heap_truncate_find_FKs(), index_concurrently_swap(), IndexSetParentIndex(), is_schema_publication(), LargeObjectDrop(), LargeObjectExistsWithSnapshot(), load_domaintype_info(), load_enum_cache_data(), LookupOpclassInfo(), makeConfigurationDependencies(), MakeConfigurationMapping(), MarkInheritDetached(), MergeConstraintsIntoExisting(), MergeWithExistingConstraint(), movedb(), object_ownercheck(), PartitionHasPendingDetach(), pg_extension_config_dump(), pg_get_constraintdef_worker(), pg_get_serial_sequence(), pg_get_triggerdef_worker(), pg_largeobject_aclmask_snapshot(), QueueFKConstraintValidation(), RangeDelete(), recordExtensionInitPrivWorker(), recordExtObjInitPriv(), relation_has_policies(), RelationBuildPartitionDesc(), RelationBuildRowSecurity(), RelationBuildRuleLock(), RelationBuildTriggers(), RelationBuildTupleDesc(), RelationGetExclusionInfo(), RelationGetFKeyList(), RelationGetIndexList(), RelationGetNotNullConstraints(), RelationGetStatExtList(), RelationRemoveInheritance(), RelidByRelfilenumber(), RememberAllDependentForRebuilding(), RemoveAttrDefault(), RemoveAttrDefaultById(), RemoveExtensionById(), RemoveInheritance(), RemovePolicyById(), RemoveRewriteRuleById(), RemoveRoleFromInitPriv(), RemoveRoleFromObjectACL(), RemoveRoleFromObjectPolicy(), RemoveStatistics(), RemoveTriggerById(), RemoveTSConfigurationById(), rename_policy(), renametrig(), renametrig_internal(), renametrig_partition(), ReplaceRoleInInitPriv(), replorigin_create(), ScanPgRelation(), SearchCatCacheList(), SearchCatCacheMiss(), sepgsql_attribute_post_create(), sepgsql_database_post_create(), sepgsql_proc_post_create(), sepgsql_proc_setattr(), sepgsql_relation_post_create(), sepgsql_relation_setattr(), sepgsql_relation_setattr_extra(), sepgsql_schema_post_create(), sequenceIsOwned(), SetSecurityLabel(), SetSharedSecurityLabel(), shdepChangeDep(), shdepDropDependency(), shdepDropOwned(), shdepReassignOwned(), systable_inplace_update_begin(), systable_inplace_update_cancel(), systable_inplace_update_finish(), toastrel_valueid_exists(), TriggerSetParentTrigger(), tryAttachPartitionForeignKey(), typeInheritsFrom(), vac_update_datfrozenxid(), and validatePartitionedIndex().

◆ systable_endscan_ordered()

void systable_endscan_ordered ( SysScanDesc  sysscan)

Definition at line 760 of file genam.c.

761{
762 if (sysscan->slot)
763 {
765 sysscan->slot = NULL;
766 }
767
768 Assert(sysscan->irel);
769 index_endscan(sysscan->iscan);
770 if (sysscan->snapshot)
772
773 /*
774 * Reset the bsysscan flag at the end of the systable scan. See detailed
775 * comments in xact.c where these variables are declared.
776 */
778 bsysscan = false;
779
780 pfree(sysscan);
781}

References Assert, bsysscan, CheckXidAlive, ExecDropSingleTupleTableSlot(), index_endscan(), SysScanDescData::irel, SysScanDescData::iscan, pfree(), SysScanDescData::slot, SysScanDescData::snapshot, TransactionIdIsValid, and UnregisterSnapshot().

Referenced by BuildEventTriggerCache(), check_toasted_attribute(), enum_endpoint(), enum_range_internal(), heap_fetch_toast_slice(), inv_getsize(), inv_read(), inv_truncate(), inv_write(), lookup_ts_config_cache(), and toast_delete_datum().

◆ systable_getnext()

HeapTuple systable_getnext ( SysScanDesc  sysscan)

Definition at line 513 of file genam.c.

514{
515 HeapTuple htup = NULL;
516
517 if (sysscan->irel)
518 {
519 if (index_getnext_slot(sysscan->iscan, ForwardScanDirection, sysscan->slot))
520 {
521 bool shouldFree;
522
523 htup = ExecFetchSlotHeapTuple(sysscan->slot, false, &shouldFree);
524 Assert(!shouldFree);
525
526 /*
527 * We currently don't need to support lossy index operators for
528 * any system catalog scan. It could be done here, using the scan
529 * keys to drive the operator calls, if we arranged to save the
530 * heap attnums during systable_beginscan(); this is practical
531 * because we still wouldn't need to support indexes on
532 * expressions.
533 */
534 if (sysscan->iscan->xs_recheck)
535 elog(ERROR, "system catalog scans with lossy index conditions are not implemented");
536 }
537 }
538 else
539 {
540 if (table_scan_getnextslot(sysscan->scan, ForwardScanDirection, sysscan->slot))
541 {
542 bool shouldFree;
543
544 htup = ExecFetchSlotHeapTuple(sysscan->slot, false, &shouldFree);
545 Assert(!shouldFree);
546 }
547 }
548
549 /*
550 * Handle the concurrent abort while fetching the catalog tuple during
551 * logical streaming of a transaction.
552 */
554
555 return htup;
556}
HeapTuple ExecFetchSlotHeapTuple(TupleTableSlot *slot, bool materialize, bool *shouldFree)
Definition: execTuples.c:1831
static void HandleConcurrentAbort()
Definition: genam.c:490
bool index_getnext_slot(IndexScanDesc scan, ScanDirection direction, TupleTableSlot *slot)
Definition: indexam.c:675
@ ForwardScanDirection
Definition: sdir.h:28
static bool table_scan_getnextslot(TableScanDesc sscan, ScanDirection direction, TupleTableSlot *slot)
Definition: tableam.h:1061

References Assert, elog, ERROR, ExecFetchSlotHeapTuple(), ForwardScanDirection, HandleConcurrentAbort(), index_getnext_slot(), SysScanDescData::irel, SysScanDescData::iscan, SysScanDescData::scan, SysScanDescData::slot, table_scan_getnextslot(), and IndexScanDescData::xs_recheck.

Referenced by AfterTriggerSetState(), AlterConstraintNamespaces(), AlterConstrTriggerDeferrability(), AlterDatabase(), AlterDatabaseOwner(), AlterDatabaseRefreshColl(), AlterDomainDropConstraint(), AlterDomainValidateConstraint(), AlterExtensionNamespace(), AlterPolicy(), AlterSeqNamespaces(), AlterSetting(), AlterTypeRecurse(), ApplyExtensionUpdates(), ApplySetting(), ATExecAddOf(), ATExecAlterChildConstr(), ATExecAlterColumnType(), ATExecAlterConstraint(), ATExecAttachPartition(), ATExecDropConstraint(), ATExecValidateConstraint(), ATPrepChangePersistence(), AttrDefaultFetch(), change_owner_fix_column_acls(), change_owner_recurse_to_sequences(), changeDependenciesOf(), changeDependenciesOn(), changeDependencyFor(), CheckConstraintFetch(), checkSharedDependencies(), ChooseConstraintName(), CloneFkReferenced(), CloneRowTriggersToPartition(), ConstraintNameExists(), ConstraintNameIsUsed(), CopyStatistics(), copyTemplateDependencies(), CountDBSubscriptions(), CreateComments(), CreateInheritance(), CreatePolicy(), CreateSharedComments(), CreateTriggerFiringOn(), DefineOpClass(), DefineTSConfiguration(), DeleteAttributeTuples(), DeleteComments(), deleteDependencyRecordsFor(), deleteDependencyRecordsForClass(), deleteDependencyRecordsForSpecific(), DeleteInheritsTuple(), DeleteInitPrivs(), deleteOneObject(), DeleteSecurityLabel(), DeleteSharedComments(), DeleteSharedSecurityLabel(), DeleteSystemAttributeTuples(), drop_parent_dependency(), DropClonedTriggersFromPartition(), DropConfigurationMapping(), dropconstraint_internal(), dropDatabaseDependencies(), DropObjectById(), DropRole(), EnableDisableTrigger(), EnumValuesDelete(), exec_object_restorecon(), ExecAlterExtensionStmt(), ExecGrant_Largeobject(), extension_config_remove(), fetch_statentries_for_relation(), find_composite_type_dependencies(), find_inheritance_children_extended(), findDependentObjects(), findDomainNotNullConstraint(), findNotNullConstraintAttnum(), get_catalog_object_by_oid_extended(), get_database_oid(), get_db_info(), get_domain_constraint_oid(), get_index_constraint(), get_index_ref_constraints(), get_partition_parent_worker(), get_pkey_attnames(), get_primary_key_attnos(), get_relation_constraint_attnos(), get_relation_constraint_oid(), get_relation_idx_constraint_oid(), get_relation_policy_oid(), get_rels_with_domain(), get_trigger_oid(), GetAllTablesPublications(), GetAttrDefaultColumnAddress(), GetAttrDefaultOid(), getAutoExtensionsOfObject(), GetComment(), GetDatabaseTuple(), GetDatabaseTupleByOid(), GetDefaultOpClass(), getExtensionOfObject(), GetForeignKeyActionTriggers(), GetForeignKeyCheckTriggers(), GetNewOidWithIndex(), getObjectDescription(), getObjectIdentityParts(), getOwnedSequences_internal(), GetParentedForeignKeyRefs(), GetPublicationRelations(), GetPublicationSchemas(), GetSecurityLabel(), GetSharedSecurityLabel(), GetSubscriptionRelations(), has_superclass(), HasSubscriptionRelations(), heap_truncate_find_FKs(), index_concurrently_swap(), IndexSetParentIndex(), is_schema_publication(), LargeObjectDrop(), LargeObjectExistsWithSnapshot(), load_domaintype_info(), load_enum_cache_data(), LookupOpclassInfo(), makeConfigurationDependencies(), MakeConfigurationMapping(), MarkInheritDetached(), MergeConstraintsIntoExisting(), MergeWithExistingConstraint(), movedb(), object_ownercheck(), PartitionHasPendingDetach(), pg_extension_config_dump(), pg_get_constraintdef_worker(), pg_get_serial_sequence(), pg_get_triggerdef_worker(), pg_largeobject_aclmask_snapshot(), QueueFKConstraintValidation(), RangeDelete(), recordExtensionInitPrivWorker(), recordExtObjInitPriv(), relation_has_policies(), RelationBuildPartitionDesc(), RelationBuildRowSecurity(), RelationBuildRuleLock(), RelationBuildTriggers(), RelationBuildTupleDesc(), RelationGetExclusionInfo(), RelationGetFKeyList(), RelationGetIndexList(), RelationGetNotNullConstraints(), RelationGetStatExtList(), RelationRemoveInheritance(), RelidByRelfilenumber(), RememberAllDependentForRebuilding(), RemoveAttrDefault(), RemoveAttrDefaultById(), RemoveExtensionById(), RemoveInheritance(), RemovePolicyById(), RemoveRewriteRuleById(), RemoveRoleFromInitPriv(), RemoveRoleFromObjectACL(), RemoveRoleFromObjectPolicy(), RemoveStatistics(), RemoveTriggerById(), RemoveTSConfigurationById(), rename_policy(), renametrig(), renametrig_internal(), renametrig_partition(), ReplaceRoleInInitPriv(), replorigin_create(), ScanPgRelation(), SearchCatCacheList(), SearchCatCacheMiss(), sepgsql_attribute_post_create(), sepgsql_database_post_create(), sepgsql_proc_post_create(), sepgsql_proc_setattr(), sepgsql_relation_post_create(), sepgsql_relation_setattr(), sepgsql_relation_setattr_extra(), sepgsql_schema_post_create(), sequenceIsOwned(), SetSecurityLabel(), SetSharedSecurityLabel(), shdepChangeDep(), shdepDropDependency(), shdepDropOwned(), shdepReassignOwned(), systable_inplace_update_begin(), toastrel_valueid_exists(), TriggerSetParentTrigger(), tryAttachPartitionForeignKey(), typeInheritsFrom(), vac_update_datfrozenxid(), and validatePartitionedIndex().

◆ systable_getnext_ordered()

HeapTuple systable_getnext_ordered ( SysScanDesc  sysscan,
ScanDirection  direction 
)

Definition at line 735 of file genam.c.

736{
737 HeapTuple htup = NULL;
738
739 Assert(sysscan->irel);
740 if (index_getnext_slot(sysscan->iscan, direction, sysscan->slot))
741 htup = ExecFetchSlotHeapTuple(sysscan->slot, false, NULL);
742
743 /* See notes in systable_getnext */
744 if (htup && sysscan->iscan->xs_recheck)
745 elog(ERROR, "system catalog scans with lossy index conditions are not implemented");
746
747 /*
748 * Handle the concurrent abort while fetching the catalog tuple during
749 * logical streaming of a transaction.
750 */
752
753 return htup;
754}

References Assert, elog, ERROR, ExecFetchSlotHeapTuple(), HandleConcurrentAbort(), index_getnext_slot(), SysScanDescData::irel, SysScanDescData::iscan, SysScanDescData::slot, and IndexScanDescData::xs_recheck.

Referenced by BuildEventTriggerCache(), check_toasted_attribute(), enum_endpoint(), enum_range_internal(), heap_fetch_toast_slice(), inv_getsize(), inv_read(), inv_truncate(), inv_write(), lookup_ts_config_cache(), and toast_delete_datum().

◆ systable_inplace_update_begin()

void systable_inplace_update_begin ( Relation  relation,
Oid  indexId,
bool  indexOK,
Snapshot  snapshot,
int  nkeys,
const ScanKeyData key,
HeapTuple oldtupcopy,
void **  state 
)

Definition at line 810 of file genam.c.

817{
818 int retries = 0;
819 SysScanDesc scan;
820 HeapTuple oldtup;
822
823 /*
824 * For now, we don't allow parallel updates. Unlike a regular update,
825 * this should never create a combo CID, so it might be possible to relax
826 * this restriction, but not without more thought and testing. It's not
827 * clear that it would be useful, anyway.
828 */
829 if (IsInParallelMode())
831 (errcode(ERRCODE_INVALID_TRANSACTION_STATE),
832 errmsg("cannot update tuples during a parallel operation")));
833
834 /*
835 * Accept a snapshot argument, for symmetry, but this function advances
836 * its snapshot as needed to reach the tail of the updated tuple chain.
837 */
838 Assert(snapshot == NULL);
839
840 Assert(IsInplaceUpdateRelation(relation) || !IsSystemRelation(relation));
841
842 /* Loop for an exclusive-locked buffer of a non-updated tuple. */
843 do
844 {
845 TupleTableSlot *slot;
846
848
849 /*
850 * Processes issuing heap_update (e.g. GRANT) at maximum speed could
851 * drive us to this error. A hostile table owner has stronger ways to
852 * damage their own table, so that's minor.
853 */
854 if (retries++ > 10000)
855 elog(ERROR, "giving up after too many tries to overwrite row");
856
857 INJECTION_POINT("inplace-before-pin");
858 scan = systable_beginscan(relation, indexId, indexOK, snapshot,
859 nkeys, unconstify(ScanKeyData *, key));
860 oldtup = systable_getnext(scan);
861 if (!HeapTupleIsValid(oldtup))
862 {
863 systable_endscan(scan);
864 *oldtupcopy = NULL;
865 return;
866 }
867
868 slot = scan->slot;
870 bslot = (BufferHeapTupleTableSlot *) slot;
871 } while (!heap_inplace_lock(scan->heap_rel,
872 bslot->base.tuple, bslot->buffer,
873 (void (*) (void *)) systable_endscan, scan));
874
875 *oldtupcopy = heap_copytuple(oldtup);
876 *state = scan;
877}
#define unconstify(underlying_type, expr)
Definition: c.h:1202
bool IsSystemRelation(Relation relation)
Definition: catalog.c:73
bool IsInplaceUpdateRelation(Relation relation)
Definition: catalog.c:152
void systable_endscan(SysScanDesc sysscan)
Definition: genam.c:606
HeapTuple systable_getnext(SysScanDesc sysscan)
Definition: genam.c:513
SysScanDesc systable_beginscan(Relation heapRelation, Oid indexId, bool indexOK, Snapshot snapshot, int nkeys, ScanKey key)
Definition: genam.c:387
bool heap_inplace_lock(Relation relation, HeapTuple oldtup_ptr, Buffer buffer, void(*release_callback)(void *), void *arg)
Definition: heapam.c:6270
HeapTuple heap_copytuple(HeapTuple tuple)
Definition: heaptuple.c:778
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
#define INJECTION_POINT(name)
#define CHECK_FOR_INTERRUPTS()
Definition: miscadmin.h:122
Definition: regguts.h:323
#define TTS_IS_BUFFERTUPLE(slot)
Definition: tuptable.h:237
bool IsInParallelMode(void)
Definition: xact.c:1088

References Assert, BufferHeapTupleTableSlot::buffer, CHECK_FOR_INTERRUPTS, elog, ereport, errcode(), errmsg(), ERROR, heap_copytuple(), heap_inplace_lock(), SysScanDescData::heap_rel, HeapTupleIsValid, INJECTION_POINT, IsInParallelMode(), IsInplaceUpdateRelation(), IsSystemRelation(), sort-test::key, SysScanDescData::slot, systable_beginscan(), systable_endscan(), systable_getnext(), TTS_IS_BUFFERTUPLE, and unconstify.

Referenced by create_toast_table(), dropdb(), EventTriggerOnLogin(), index_update_stats(), relation_statistics_update(), vac_update_datfrozenxid(), and vac_update_relstats().

◆ systable_inplace_update_cancel()

void systable_inplace_update_cancel ( void *  state)

Definition at line 905 of file genam.c.

906{
908 Relation relation = scan->heap_rel;
909 TupleTableSlot *slot = scan->slot;
911 HeapTuple oldtup = bslot->base.tuple;
912 Buffer buffer = bslot->buffer;
913
914 heap_inplace_unlock(relation, oldtup, buffer);
915 systable_endscan(scan);
916}
int Buffer
Definition: buf.h:23
void heap_inplace_unlock(Relation relation, HeapTuple oldtup, Buffer buffer)
Definition: heapam.c:6551

References BufferHeapTupleTableSlot::buffer, heap_inplace_unlock(), SysScanDescData::heap_rel, SysScanDescData::slot, and systable_endscan().

Referenced by EventTriggerOnLogin(), index_update_stats(), relation_statistics_update(), vac_update_datfrozenxid(), and vac_update_relstats().

◆ systable_inplace_update_finish()

void systable_inplace_update_finish ( void *  state,
HeapTuple  tuple 
)

Definition at line 886 of file genam.c.

887{
889 Relation relation = scan->heap_rel;
890 TupleTableSlot *slot = scan->slot;
892 HeapTuple oldtup = bslot->base.tuple;
893 Buffer buffer = bslot->buffer;
894
895 heap_inplace_update_and_unlock(relation, oldtup, tuple, buffer);
896 systable_endscan(scan);
897}
void heap_inplace_update_and_unlock(Relation relation, HeapTuple oldtup, HeapTuple tuple, Buffer buffer)
Definition: heapam.c:6406

References BufferHeapTupleTableSlot::buffer, heap_inplace_update_and_unlock(), SysScanDescData::heap_rel, SysScanDescData::slot, and systable_endscan().

Referenced by create_toast_table(), dropdb(), EventTriggerOnLogin(), index_update_stats(), relation_statistics_update(), vac_update_datfrozenxid(), and vac_update_relstats().

◆ systable_recheck_tuple()

bool systable_recheck_tuple ( SysScanDesc  sysscan,
HeapTuple  tup 
)

Definition at line 572 of file genam.c.

573{
574 Snapshot freshsnap;
575 bool result;
576
577 Assert(tup == ExecFetchSlotHeapTuple(sysscan->slot, false, NULL));
578
579 /*
580 * Trust that table_tuple_satisfies_snapshot() and its subsidiaries
581 * (commonly LockBuffer() and HeapTupleSatisfiesMVCC()) do not themselves
582 * acquire snapshots, so we need not register the snapshot. Those
583 * facilities are too low-level to have any business scanning tables.
584 */
585 freshsnap = GetCatalogSnapshot(RelationGetRelid(sysscan->heap_rel));
586
588 sysscan->slot,
589 freshsnap);
590
591 /*
592 * Handle the concurrent abort while fetching the catalog tuple during
593 * logical streaming of a transaction.
594 */
596
597 return result;
598}
static bool table_tuple_satisfies_snapshot(Relation rel, TupleTableSlot *slot, Snapshot snapshot)
Definition: tableam.h:1341

References Assert, ExecFetchSlotHeapTuple(), GetCatalogSnapshot(), HandleConcurrentAbort(), SysScanDescData::heap_rel, RelationGetRelid, SysScanDescData::slot, and table_tuple_satisfies_snapshot().

Referenced by findDependentObjects(), and shdepDropOwned().