PostgreSQL Source Code  git master
dependency.c File Reference
#include "postgres.h"
#include "access/genam.h"
#include "access/htup_details.h"
#include "access/table.h"
#include "access/xact.h"
#include "catalog/catalog.h"
#include "catalog/dependency.h"
#include "catalog/heap.h"
#include "catalog/index.h"
#include "catalog/objectaccess.h"
#include "catalog/pg_am.h"
#include "catalog/pg_amop.h"
#include "catalog/pg_amproc.h"
#include "catalog/pg_attrdef.h"
#include "catalog/pg_authid.h"
#include "catalog/pg_cast.h"
#include "catalog/pg_collation.h"
#include "catalog/pg_constraint.h"
#include "catalog/pg_conversion.h"
#include "catalog/pg_database.h"
#include "catalog/pg_default_acl.h"
#include "catalog/pg_depend.h"
#include "catalog/pg_event_trigger.h"
#include "catalog/pg_extension.h"
#include "catalog/pg_foreign_data_wrapper.h"
#include "catalog/pg_foreign_server.h"
#include "catalog/pg_init_privs.h"
#include "catalog/pg_language.h"
#include "catalog/pg_largeobject.h"
#include "catalog/pg_namespace.h"
#include "catalog/pg_opclass.h"
#include "catalog/pg_operator.h"
#include "catalog/pg_opfamily.h"
#include "catalog/pg_policy.h"
#include "catalog/pg_proc.h"
#include "catalog/pg_publication.h"
#include "catalog/pg_publication_rel.h"
#include "catalog/pg_rewrite.h"
#include "catalog/pg_statistic_ext.h"
#include "catalog/pg_subscription.h"
#include "catalog/pg_tablespace.h"
#include "catalog/pg_transform.h"
#include "catalog/pg_trigger.h"
#include "catalog/pg_ts_config.h"
#include "catalog/pg_ts_dict.h"
#include "catalog/pg_ts_parser.h"
#include "catalog/pg_ts_template.h"
#include "catalog/pg_type.h"
#include "catalog/pg_user_mapping.h"
#include "commands/comment.h"
#include "commands/defrem.h"
#include "commands/event_trigger.h"
#include "commands/extension.h"
#include "commands/policy.h"
#include "commands/publicationcmds.h"
#include "commands/seclabel.h"
#include "commands/sequence.h"
#include "commands/trigger.h"
#include "commands/typecmds.h"
#include "nodes/nodeFuncs.h"
#include "parser/parsetree.h"
#include "rewrite/rewriteRemove.h"
#include "storage/lmgr.h"
#include "utils/acl.h"
#include "utils/fmgroids.h"
#include "utils/guc.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
Include dependency graph for dependency.c:

Go to the source code of this file.

Data Structures

struct  ObjectAddressExtra
 
struct  ObjectAddresses
 
struct  ObjectAddressStack
 
struct  ObjectAddressAndFlags
 
struct  find_expr_references_context
 

Macros

#define DEPFLAG_ORIGINAL   0x0001 /* an original deletion target */
 
#define DEPFLAG_NORMAL   0x0002 /* reached via normal dependency */
 
#define DEPFLAG_AUTO   0x0004 /* reached via auto dependency */
 
#define DEPFLAG_INTERNAL   0x0008 /* reached via internal dependency */
 
#define DEPFLAG_PARTITION   0x0010 /* reached via partition dependency */
 
#define DEPFLAG_EXTENSION   0x0020 /* reached via extension dependency */
 
#define DEPFLAG_REVERSE   0x0040 /* reverse internal/extension link */
 
#define DEPFLAG_IS_PART   0x0080 /* has a partition dependency */
 
#define DEPFLAG_SUBOBJECT   0x0100 /* subobject of another deletable object */
 
#define MAX_REPORTED_DEPS   100
 

Typedefs

typedef struct ObjectAddressStack ObjectAddressStack
 

Functions

static void findDependentObjects (const ObjectAddress *object, int objflags, int flags, ObjectAddressStack *stack, ObjectAddresses *targetObjects, const ObjectAddresses *pendingObjects, Relation *depRel)
 
static void reportDependentObjects (const ObjectAddresses *targetObjects, DropBehavior behavior, int flags, const ObjectAddress *origObject)
 
static void deleteOneObject (const ObjectAddress *object, Relation *depRel, int32 flags)
 
static void doDeletion (const ObjectAddress *object, int flags)
 
static bool find_expr_references_walker (Node *node, find_expr_references_context *context)
 
static void eliminate_duplicate_dependencies (ObjectAddresses *addrs)
 
static int object_address_comparator (const void *a, const void *b)
 
static void add_object_address (ObjectClass oclass, Oid objectId, int32 subId, ObjectAddresses *addrs)
 
static void add_exact_object_address_extra (const ObjectAddress *object, const ObjectAddressExtra *extra, ObjectAddresses *addrs)
 
static bool object_address_present_add_flags (const ObjectAddress *object, int flags, ObjectAddresses *addrs)
 
static bool stack_address_present_add_flags (const ObjectAddress *object, int flags, ObjectAddressStack *stack)
 
static void DeleteInitPrivs (const ObjectAddress *object)
 
static void deleteObjectsInList (ObjectAddresses *targetObjects, Relation *depRel, int flags)
 
void performDeletion (const ObjectAddress *object, DropBehavior behavior, int flags)
 
void performMultipleDeletions (const ObjectAddresses *objects, DropBehavior behavior, int flags)
 
static void DropObjectById (const ObjectAddress *object)
 
static void deleteOneObject (const ObjectAddress *object, Relation *depRel, int flags)
 
void AcquireDeletionLock (const ObjectAddress *object, int flags)
 
void ReleaseDeletionLock (const ObjectAddress *object)
 
void recordDependencyOnExpr (const ObjectAddress *depender, Node *expr, List *rtable, DependencyType behavior)
 
void recordDependencyOnSingleRelExpr (const ObjectAddress *depender, Node *expr, Oid relId, DependencyType behavior, DependencyType self_behavior, bool reverse_self)
 
ObjectAddressesnew_object_addresses (void)
 
void add_exact_object_address (const ObjectAddress *object, ObjectAddresses *addrs)
 
bool object_address_present (const ObjectAddress *object, const ObjectAddresses *addrs)
 
void record_object_address_dependencies (const ObjectAddress *depender, ObjectAddresses *referenced, DependencyType behavior)
 
void sort_object_addresses (ObjectAddresses *addrs)
 
void free_object_addresses (ObjectAddresses *addrs)
 
ObjectClass getObjectClass (const ObjectAddress *object)
 

Variables

static const Oid object_classes []
 

Macro Definition Documentation

◆ DEPFLAG_AUTO

#define DEPFLAG_AUTO   0x0004 /* reached via auto dependency */

Definition at line 100 of file dependency.c.

Referenced by findDependentObjects(), and reportDependentObjects().

◆ DEPFLAG_EXTENSION

#define DEPFLAG_EXTENSION   0x0020 /* reached via extension dependency */

Definition at line 103 of file dependency.c.

Referenced by findDependentObjects(), and reportDependentObjects().

◆ DEPFLAG_INTERNAL

#define DEPFLAG_INTERNAL   0x0008 /* reached via internal dependency */

Definition at line 101 of file dependency.c.

Referenced by findDependentObjects(), and reportDependentObjects().

◆ DEPFLAG_IS_PART

#define DEPFLAG_IS_PART   0x0080 /* has a partition dependency */

Definition at line 105 of file dependency.c.

Referenced by findDependentObjects(), and reportDependentObjects().

◆ DEPFLAG_NORMAL

#define DEPFLAG_NORMAL   0x0002 /* reached via normal dependency */

Definition at line 99 of file dependency.c.

Referenced by deleteObjectsInList(), and findDependentObjects().

◆ DEPFLAG_ORIGINAL

#define DEPFLAG_ORIGINAL   0x0001 /* an original deletion target */

◆ DEPFLAG_PARTITION

#define DEPFLAG_PARTITION   0x0010 /* reached via partition dependency */

Definition at line 102 of file dependency.c.

Referenced by findDependentObjects(), and reportDependentObjects().

◆ DEPFLAG_REVERSE

#define DEPFLAG_REVERSE   0x0040 /* reverse internal/extension link */

Definition at line 104 of file dependency.c.

Referenced by deleteObjectsInList(), and findDependentObjects().

◆ DEPFLAG_SUBOBJECT

#define DEPFLAG_SUBOBJECT   0x0100 /* subobject of another deletable object */

◆ MAX_REPORTED_DEPS

#define MAX_REPORTED_DEPS   100

Referenced by reportDependentObjects().

Typedef Documentation

◆ ObjectAddressStack

Function Documentation

◆ AcquireDeletionLock()

void AcquireDeletionLock ( const ObjectAddress object,
int  flags 
)

Definition at line 1514 of file dependency.c.

References AccessExclusiveLock, ObjectAddress::classId, LockDatabaseObject(), LockRelationOid(), ObjectAddress::objectId, PERFORM_DELETION_CONCURRENTLY, and ShareUpdateExclusiveLock.

Referenced by findDependentObjects(), performDeletion(), performMultipleDeletions(), and shdepDropOwned().

1515 {
1516  if (object->classId == RelationRelationId)
1517  {
1518  /*
1519  * In DROP INDEX CONCURRENTLY, take only ShareUpdateExclusiveLock on
1520  * the index for the moment. index_drop() will promote the lock once
1521  * it's safe to do so. In all other cases we need full exclusive
1522  * lock.
1523  */
1524  if (flags & PERFORM_DELETION_CONCURRENTLY)
1526  else
1528  }
1529  else
1530  {
1531  /* assume we should lock the whole object not a sub-object */
1532  LockDatabaseObject(object->classId, object->objectId, 0,
1534  }
1535 }
#define PERFORM_DELETION_CONCURRENTLY
Definition: dependency.h:134
void LockDatabaseObject(Oid classid, Oid objid, uint16 objsubid, LOCKMODE lockmode)
Definition: lmgr.c:976
#define ShareUpdateExclusiveLock
Definition: lockdefs.h:39
#define AccessExclusiveLock
Definition: lockdefs.h:45
void LockRelationOid(Oid relid, LOCKMODE lockmode)
Definition: lmgr.c:109

◆ add_exact_object_address()

void add_exact_object_address ( const ObjectAddress object,
ObjectAddresses addrs 
)

Definition at line 2482 of file dependency.c.

References Assert, ObjectAddresses::extras, ObjectAddresses::maxrefs, ObjectAddresses::numrefs, ObjectAddressStack::object, ObjectAddresses::refs, and repalloc().

Referenced by AggregateCreate(), AlterConstraintNamespaces(), AlterIndexNamespaces(), AlterRelationNamespaceInternal(), AlterTypeNamespaceInternal(), ATExecDropColumn(), ATPostAlterTypeCleanup(), CastCreate(), CreateConstraintEntry(), CreateProceduralLanguage(), CreateTransform(), DropClonedTriggersFromPartition(), GenerateTypeDependencies(), heap_create_with_catalog(), index_create(), InsertExtensionTuple(), makeConfigurationDependencies(), makeDictionaryDependencies(), makeOperatorDependencies(), makeParserDependencies(), makeTSTemplateDependencies(), PreCommit_on_commit_actions(), ProcedureCreate(), RangeCreate(), recordDependencyOnSingleRelExpr(), ReindexRelationConcurrently(), RemoveObjects(), RemoveRelations(), shdepDropOwned(), and StorePartitionKey().

2484 {
2485  ObjectAddress *item;
2486 
2487  /* enlarge array if needed */
2488  if (addrs->numrefs >= addrs->maxrefs)
2489  {
2490  addrs->maxrefs *= 2;
2491  addrs->refs = (ObjectAddress *)
2492  repalloc(addrs->refs, addrs->maxrefs * sizeof(ObjectAddress));
2493  Assert(!addrs->extras);
2494  }
2495  /* record this item */
2496  item = addrs->refs + addrs->numrefs;
2497  *item = *object;
2498  addrs->numrefs++;
2499 }
ObjectAddress * refs
Definition: dependency.c:112
#define Assert(condition)
Definition: c.h:804
void * repalloc(void *pointer, Size size)
Definition: mcxt.c:1182
ObjectAddressExtra * extras
Definition: dependency.c:113

◆ add_exact_object_address_extra()

static void add_exact_object_address_extra ( const ObjectAddress object,
const ObjectAddressExtra extra,
ObjectAddresses addrs 
)
static

Definition at line 2507 of file dependency.c.

References ObjectAddresses::extras, ObjectAddresses::maxrefs, ObjectAddresses::numrefs, ObjectAddressStack::object, palloc(), ObjectAddresses::refs, and repalloc().

Referenced by findDependentObjects().

2510 {
2511  ObjectAddress *item;
2512  ObjectAddressExtra *itemextra;
2513 
2514  /* allocate extra space if first time */
2515  if (!addrs->extras)
2516  addrs->extras = (ObjectAddressExtra *)
2517  palloc(addrs->maxrefs * sizeof(ObjectAddressExtra));
2518 
2519  /* enlarge array if needed */
2520  if (addrs->numrefs >= addrs->maxrefs)
2521  {
2522  addrs->maxrefs *= 2;
2523  addrs->refs = (ObjectAddress *)
2524  repalloc(addrs->refs, addrs->maxrefs * sizeof(ObjectAddress));
2525  addrs->extras = (ObjectAddressExtra *)
2526  repalloc(addrs->extras, addrs->maxrefs * sizeof(ObjectAddressExtra));
2527  }
2528  /* record this item */
2529  item = addrs->refs + addrs->numrefs;
2530  *item = *object;
2531  itemextra = addrs->extras + addrs->numrefs;
2532  *itemextra = *extra;
2533  addrs->numrefs++;
2534 }
ObjectAddress * refs
Definition: dependency.c:112
void * repalloc(void *pointer, Size size)
Definition: mcxt.c:1182
ObjectAddressExtra * extras
Definition: dependency.c:113
void * palloc(Size size)
Definition: mcxt.c:1062

◆ add_object_address()

static void add_object_address ( ObjectClass  oclass,
Oid  objectId,
int32  subId,
ObjectAddresses addrs 
)
static

Definition at line 2449 of file dependency.c.

References Assert, ObjectAddress::classId, ObjectAddresses::extras, LAST_OCLASS, lengthof, ObjectAddresses::maxrefs, ObjectAddresses::numrefs, object_classes, ObjectAddress::objectId, ObjectAddress::objectSubId, ObjectAddresses::refs, repalloc(), and StaticAssertStmt.

Referenced by find_expr_references_walker().

2451 {
2452  ObjectAddress *item;
2453 
2454  /*
2455  * Make sure object_classes is kept up to date with the ObjectClass enum.
2456  */
2458  "object_classes[] must cover all ObjectClasses");
2459 
2460  /* enlarge array if needed */
2461  if (addrs->numrefs >= addrs->maxrefs)
2462  {
2463  addrs->maxrefs *= 2;
2464  addrs->refs = (ObjectAddress *)
2465  repalloc(addrs->refs, addrs->maxrefs * sizeof(ObjectAddress));
2466  Assert(!addrs->extras);
2467  }
2468  /* record this item */
2469  item = addrs->refs + addrs->numrefs;
2470  item->classId = object_classes[oclass];
2471  item->objectId = objectId;
2472  item->objectSubId = subId;
2473  addrs->numrefs++;
2474 }
#define LAST_OCLASS
Definition: dependency.h:130
#define lengthof(array)
Definition: c.h:734
#define StaticAssertStmt(condition, errmessage)
Definition: c.h:918
static const Oid object_classes[]
Definition: dependency.c:146
ObjectAddress * refs
Definition: dependency.c:112
#define Assert(condition)
Definition: c.h:804
void * repalloc(void *pointer, Size size)
Definition: mcxt.c:1182
ObjectAddressExtra * extras
Definition: dependency.c:113

◆ DeleteInitPrivs()

static void DeleteInitPrivs ( const ObjectAddress object)
static

Definition at line 2872 of file dependency.c.

References BTEqualStrategyNumber, CatalogTupleDelete(), ObjectAddress::classId, HeapTupleIsValid, Int32GetDatum, sort-test::key, ObjectAddress::objectId, ObjectIdGetDatum, ObjectAddress::objectSubId, RowExclusiveLock, ScanKeyInit(), systable_beginscan(), systable_endscan(), systable_getnext(), HeapTupleData::t_self, table_close(), and table_open().

Referenced by deleteOneObject().

2873 {
2874  Relation relation;
2875  ScanKeyData key[3];
2876  SysScanDesc scan;
2877  HeapTuple oldtuple;
2878 
2879  relation = table_open(InitPrivsRelationId, RowExclusiveLock);
2880 
2881  ScanKeyInit(&key[0],
2882  Anum_pg_init_privs_objoid,
2883  BTEqualStrategyNumber, F_OIDEQ,
2884  ObjectIdGetDatum(object->objectId));
2885  ScanKeyInit(&key[1],
2886  Anum_pg_init_privs_classoid,
2887  BTEqualStrategyNumber, F_OIDEQ,
2888  ObjectIdGetDatum(object->classId));
2889  ScanKeyInit(&key[2],
2890  Anum_pg_init_privs_objsubid,
2891  BTEqualStrategyNumber, F_INT4EQ,
2892  Int32GetDatum(object->objectSubId));
2893 
2894  scan = systable_beginscan(relation, InitPrivsObjIndexId, true,
2895  NULL, 3, key);
2896 
2897  while (HeapTupleIsValid(oldtuple = systable_getnext(scan)))
2898  CatalogTupleDelete(relation, &oldtuple->t_self);
2899 
2900  systable_endscan(scan);
2901 
2902  table_close(relation, RowExclusiveLock);
2903 }
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:167
void systable_endscan(SysScanDesc sysscan)
Definition: genam.c:595
void CatalogTupleDelete(Relation heapRel, ItemPointer tid)
Definition: indexing.c:350
SysScanDesc systable_beginscan(Relation heapRelation, Oid indexId, bool indexOK, Snapshot snapshot, int nkeys, ScanKey key)
Definition: genam.c:383
HeapTuple systable_getnext(SysScanDesc sysscan)
Definition: genam.c:502
#define ObjectIdGetDatum(X)
Definition: postgres.h:551
ItemPointerData t_self
Definition: htup.h:65
#define RowExclusiveLock
Definition: lockdefs.h:38
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
#define Int32GetDatum(X)
Definition: postgres.h:523
void ScanKeyInit(ScanKey entry, AttrNumber attributeNumber, StrategyNumber strategy, RegProcedure procedure, Datum argument)
Definition: scankey.c:76
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:39
#define BTEqualStrategyNumber
Definition: stratnum.h:31

◆ deleteObjectsInList()

static void deleteObjectsInList ( ObjectAddresses targetObjects,
Relation depRel,
int  flags 
)
static

Definition at line 225 of file dependency.c.

References deleteOneObject(), DEPFLAG_NORMAL, DEPFLAG_ORIGINAL, DEPFLAG_REVERSE, EventTriggerSQLDropAddObject(), EventTriggerSupportsObjectClass(), ObjectAddresses::extras, ObjectAddressExtra::flags, getObjectClass(), i, ObjectAddresses::numrefs, PERFORM_DELETION_INTERNAL, PERFORM_DELETION_SKIP_ORIGINAL, ObjectAddresses::refs, and trackDroppedObjectsNeeded().

Referenced by performDeletion(), and performMultipleDeletions().

227 {
228  int i;
229 
230  /*
231  * Keep track of objects for event triggers, if necessary.
232  */
234  {
235  for (i = 0; i < targetObjects->numrefs; i++)
236  {
237  const ObjectAddress *thisobj = &targetObjects->refs[i];
238  const ObjectAddressExtra *extra = &targetObjects->extras[i];
239  bool original = false;
240  bool normal = false;
241 
242  if (extra->flags & DEPFLAG_ORIGINAL)
243  original = true;
244  if (extra->flags & DEPFLAG_NORMAL)
245  normal = true;
246  if (extra->flags & DEPFLAG_REVERSE)
247  normal = true;
248 
250  {
251  EventTriggerSQLDropAddObject(thisobj, original, normal);
252  }
253  }
254  }
255 
256  /*
257  * Delete all the objects in the proper order, except that if told to, we
258  * should skip the original object(s).
259  */
260  for (i = 0; i < targetObjects->numrefs; i++)
261  {
262  ObjectAddress *thisobj = targetObjects->refs + i;
263  ObjectAddressExtra *thisextra = targetObjects->extras + i;
264 
265  if ((flags & PERFORM_DELETION_SKIP_ORIGINAL) &&
266  (thisextra->flags & DEPFLAG_ORIGINAL))
267  continue;
268 
269  deleteOneObject(thisobj, depRel, flags);
270  }
271 }
static void deleteOneObject(const ObjectAddress *object, Relation *depRel, int32 flags)
bool trackDroppedObjectsNeeded(void)
#define PERFORM_DELETION_SKIP_ORIGINAL
Definition: dependency.h:136
#define DEPFLAG_REVERSE
Definition: dependency.c:104
ObjectClass getObjectClass(const ObjectAddress *object)
Definition: dependency.c:2737
#define DEPFLAG_ORIGINAL
Definition: dependency.c:98
ObjectAddress * refs
Definition: dependency.c:112
bool EventTriggerSupportsObjectClass(ObjectClass objclass)
void EventTriggerSQLDropAddObject(const ObjectAddress *object, bool original, bool normal)
ObjectAddressExtra * extras
Definition: dependency.c:113
#define DEPFLAG_NORMAL
Definition: dependency.c:99
int i
#define PERFORM_DELETION_INTERNAL
Definition: dependency.h:133

◆ deleteOneObject() [1/2]

static void deleteOneObject ( const ObjectAddress object,
Relation depRel,
int32  flags 
)
static

Referenced by deleteObjectsInList().

◆ deleteOneObject() [2/2]

static void deleteOneObject ( const ObjectAddress object,
Relation depRel,
int  flags 
)
static

Definition at line 1272 of file dependency.c.

References BTEqualStrategyNumber, CatalogTupleDelete(), ObjectAddress::classId, CommandCounterIncrement(), DeleteComments(), DeleteInitPrivs(), DeleteSecurityLabel(), deleteSharedDependencyRecordsFor(), doDeletion(), HeapTupleIsValid, Int32GetDatum, InvokeObjectDropHookArg, sort-test::key, ObjectAddress::objectId, ObjectIdGetDatum, ObjectAddress::objectSubId, PERFORM_DELETION_CONCURRENTLY, RowExclusiveLock, ScanKeyInit(), systable_beginscan(), systable_endscan(), systable_getnext(), HeapTupleData::t_self, table_close(), and table_open().

1273 {
1274  ScanKeyData key[3];
1275  int nkeys;
1276  SysScanDesc scan;
1277  HeapTuple tup;
1278 
1279  /* DROP hook of the objects being removed */
1280  InvokeObjectDropHookArg(object->classId, object->objectId,
1281  object->objectSubId, flags);
1282 
1283  /*
1284  * Close depRel if we are doing a drop concurrently. The object deletion
1285  * subroutine will commit the current transaction, so we can't keep the
1286  * relation open across doDeletion().
1287  */
1288  if (flags & PERFORM_DELETION_CONCURRENTLY)
1289  table_close(*depRel, RowExclusiveLock);
1290 
1291  /*
1292  * Delete the object itself, in an object-type-dependent way.
1293  *
1294  * We used to do this after removing the outgoing dependency links, but it
1295  * seems just as reasonable to do it beforehand. In the concurrent case
1296  * we *must* do it in this order, because we can't make any transactional
1297  * updates before calling doDeletion() --- they'd get committed right
1298  * away, which is not cool if the deletion then fails.
1299  */
1300  doDeletion(object, flags);
1301 
1302  /*
1303  * Reopen depRel if we closed it above
1304  */
1305  if (flags & PERFORM_DELETION_CONCURRENTLY)
1306  *depRel = table_open(DependRelationId, RowExclusiveLock);
1307 
1308  /*
1309  * Now remove any pg_depend records that link from this object to others.
1310  * (Any records linking to this object should be gone already.)
1311  *
1312  * When dropping a whole object (subId = 0), remove all pg_depend records
1313  * for its sub-objects too.
1314  */
1315  ScanKeyInit(&key[0],
1316  Anum_pg_depend_classid,
1317  BTEqualStrategyNumber, F_OIDEQ,
1318  ObjectIdGetDatum(object->classId));
1319  ScanKeyInit(&key[1],
1320  Anum_pg_depend_objid,
1321  BTEqualStrategyNumber, F_OIDEQ,
1322  ObjectIdGetDatum(object->objectId));
1323  if (object->objectSubId != 0)
1324  {
1325  ScanKeyInit(&key[2],
1326  Anum_pg_depend_objsubid,
1327  BTEqualStrategyNumber, F_INT4EQ,
1328  Int32GetDatum(object->objectSubId));
1329  nkeys = 3;
1330  }
1331  else
1332  nkeys = 2;
1333 
1334  scan = systable_beginscan(*depRel, DependDependerIndexId, true,
1335  NULL, nkeys, key);
1336 
1337  while (HeapTupleIsValid(tup = systable_getnext(scan)))
1338  {
1339  CatalogTupleDelete(*depRel, &tup->t_self);
1340  }
1341 
1342  systable_endscan(scan);
1343 
1344  /*
1345  * Delete shared dependency references related to this object. Again, if
1346  * subId = 0, remove records for sub-objects too.
1347  */
1349  object->objectSubId);
1350 
1351 
1352  /*
1353  * Delete any comments, security labels, or initial privileges associated
1354  * with this object. (This is a convenient place to do these things,
1355  * rather than having every object type know to do it.)
1356  */
1357  DeleteComments(object->objectId, object->classId, object->objectSubId);
1358  DeleteSecurityLabel(object);
1359  DeleteInitPrivs(object);
1360 
1361  /*
1362  * CommandCounterIncrement here to ensure that preceding changes are all
1363  * visible to the next deletion step.
1364  */
1366 
1367  /*
1368  * And we're done!
1369  */
1370 }
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:167
void systable_endscan(SysScanDesc sysscan)
Definition: genam.c:595
void DeleteSecurityLabel(const ObjectAddress *object)
Definition: seclabel.c:521
void CatalogTupleDelete(Relation heapRel, ItemPointer tid)
Definition: indexing.c:350
SysScanDesc systable_beginscan(Relation heapRelation, Oid indexId, bool indexOK, Snapshot snapshot, int nkeys, ScanKey key)
Definition: genam.c:383
#define PERFORM_DELETION_CONCURRENTLY
Definition: dependency.h:134
HeapTuple systable_getnext(SysScanDesc sysscan)
Definition: genam.c:502
#define ObjectIdGetDatum(X)
Definition: postgres.h:551
ItemPointerData t_self
Definition: htup.h:65
#define RowExclusiveLock
Definition: lockdefs.h:38
void deleteSharedDependencyRecordsFor(Oid classId, Oid objectId, int32 objectSubId)
Definition: pg_shdepend.c:997
void CommandCounterIncrement(void)
Definition: xact.c:1021
void DeleteComments(Oid oid, Oid classoid, int32 subid)
Definition: comment.c:326
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
static void doDeletion(const ObjectAddress *object, int flags)
Definition: dependency.c:1376
#define Int32GetDatum(X)
Definition: postgres.h:523
static void DeleteInitPrivs(const ObjectAddress *object)
Definition: dependency.c:2872
void ScanKeyInit(ScanKey entry, AttrNumber attributeNumber, StrategyNumber strategy, RegProcedure procedure, Datum argument)
Definition: scankey.c:76
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:39
#define InvokeObjectDropHookArg(classId, objectId, subId, dropflags)
Definition: objectaccess.h:162
#define BTEqualStrategyNumber
Definition: stratnum.h:31

◆ doDeletion()

static void doDeletion ( const ObjectAddress object,
int  flags 
)
static

Definition at line 1376 of file dependency.c.

References Assert, DeleteSequenceTuple(), DropObjectById(), elog, ERROR, get_rel_relkind(), getObjectClass(), heap_drop_with_catalog(), index_drop(), LargeObjectDrop(), ObjectAddress::objectId, ObjectAddress::objectSubId, OCLASS_AM, OCLASS_AMOP, OCLASS_AMPROC, OCLASS_CAST, OCLASS_CLASS, OCLASS_COLLATION, OCLASS_CONSTRAINT, OCLASS_CONVERSION, OCLASS_DATABASE, OCLASS_DEFACL, OCLASS_DEFAULT, OCLASS_EVENT_TRIGGER, OCLASS_EXTENSION, OCLASS_FDW, OCLASS_FOREIGN_SERVER, OCLASS_LANGUAGE, OCLASS_LARGEOBJECT, OCLASS_OPCLASS, OCLASS_OPERATOR, OCLASS_OPFAMILY, OCLASS_POLICY, OCLASS_PROC, OCLASS_PUBLICATION, OCLASS_PUBLICATION_REL, OCLASS_REWRITE, OCLASS_ROLE, OCLASS_SCHEMA, OCLASS_STATISTIC_EXT, OCLASS_SUBSCRIPTION, OCLASS_TBLSPACE, OCLASS_TRANSFORM, OCLASS_TRIGGER, OCLASS_TSCONFIG, OCLASS_TSDICT, OCLASS_TSPARSER, OCLASS_TSTEMPLATE, OCLASS_TYPE, OCLASS_USER_MAPPING, PERFORM_DELETION_CONCURRENT_LOCK, PERFORM_DELETION_CONCURRENTLY, RemoveAttrDefaultById(), RemoveAttributeById(), RemoveConstraintById(), RemoveExtensionById(), RemoveFunctionById(), RemoveOperatorById(), RemovePolicyById(), RemovePublicationRelById(), RemoveRewriteRuleById(), RemoveStatisticsById(), RemoveTriggerById(), RemoveTSConfigurationById(), and RemoveTypeById().

Referenced by deleteOneObject().

1377 {
1378  switch (getObjectClass(object))
1379  {
1380  case OCLASS_CLASS:
1381  {
1382  char relKind = get_rel_relkind(object->objectId);
1383 
1384  if (relKind == RELKIND_INDEX ||
1385  relKind == RELKIND_PARTITIONED_INDEX)
1386  {
1387  bool concurrent = ((flags & PERFORM_DELETION_CONCURRENTLY) != 0);
1388  bool concurrent_lock_mode = ((flags & PERFORM_DELETION_CONCURRENT_LOCK) != 0);
1389 
1390  Assert(object->objectSubId == 0);
1391  index_drop(object->objectId, concurrent, concurrent_lock_mode);
1392  }
1393  else
1394  {
1395  if (object->objectSubId != 0)
1396  RemoveAttributeById(object->objectId,
1397  object->objectSubId);
1398  else
1400  }
1401 
1402  /*
1403  * for a sequence, in addition to dropping the heap, also
1404  * delete pg_sequence tuple
1405  */
1406  if (relKind == RELKIND_SEQUENCE)
1407  DeleteSequenceTuple(object->objectId);
1408  break;
1409  }
1410 
1411  case OCLASS_PROC:
1412  RemoveFunctionById(object->objectId);
1413  break;
1414 
1415  case OCLASS_TYPE:
1416  RemoveTypeById(object->objectId);
1417  break;
1418 
1419  case OCLASS_CONSTRAINT:
1420  RemoveConstraintById(object->objectId);
1421  break;
1422 
1423  case OCLASS_DEFAULT:
1425  break;
1426 
1427  case OCLASS_LARGEOBJECT:
1428  LargeObjectDrop(object->objectId);
1429  break;
1430 
1431  case OCLASS_OPERATOR:
1432  RemoveOperatorById(object->objectId);
1433  break;
1434 
1435  case OCLASS_REWRITE:
1437  break;
1438 
1439  case OCLASS_TRIGGER:
1440  RemoveTriggerById(object->objectId);
1441  break;
1442 
1443  case OCLASS_STATISTIC_EXT:
1444  RemoveStatisticsById(object->objectId);
1445  break;
1446 
1447  case OCLASS_TSCONFIG:
1449  break;
1450 
1451  case OCLASS_EXTENSION:
1452  RemoveExtensionById(object->objectId);
1453  break;
1454 
1455  case OCLASS_POLICY:
1456  RemovePolicyById(object->objectId);
1457  break;
1458 
1461  break;
1462 
1463  case OCLASS_CAST:
1464  case OCLASS_COLLATION:
1465  case OCLASS_CONVERSION:
1466  case OCLASS_LANGUAGE:
1467  case OCLASS_OPCLASS:
1468  case OCLASS_OPFAMILY:
1469  case OCLASS_AM:
1470  case OCLASS_AMOP:
1471  case OCLASS_AMPROC:
1472  case OCLASS_SCHEMA:
1473  case OCLASS_TSPARSER:
1474  case OCLASS_TSDICT:
1475  case OCLASS_TSTEMPLATE:
1476  case OCLASS_FDW:
1477  case OCLASS_FOREIGN_SERVER:
1478  case OCLASS_USER_MAPPING:
1479  case OCLASS_DEFACL:
1480  case OCLASS_EVENT_TRIGGER:
1481  case OCLASS_PUBLICATION:
1482  case OCLASS_TRANSFORM:
1483  DropObjectById(object);
1484  break;
1485 
1486  /*
1487  * These global object types are not supported here.
1488  */
1489  case OCLASS_ROLE:
1490  case OCLASS_DATABASE:
1491  case OCLASS_TBLSPACE:
1492  case OCLASS_SUBSCRIPTION:
1493  elog(ERROR, "global objects cannot be deleted by doDeletion");
1494  break;
1495 
1496  /*
1497  * There's intentionally no default: case here; we want the
1498  * compiler to warn if a new OCLASS hasn't been handled above.
1499  */
1500  }
1501 }
void RemoveTriggerById(Oid trigOid)
Definition: trigger.c:1251
void index_drop(Oid indexId, bool concurrent, bool concurrent_lock_mode)
Definition: index.c:2091
void RemoveStatisticsById(Oid statsOid)
Definition: statscmds.c:683
void RemoveExtensionById(Oid extId)
Definition: extension.c:1867
char get_rel_relkind(Oid relid)
Definition: lsyscache.c:1974
void RemovePublicationRelById(Oid proid)
void RemoveTypeById(Oid typeOid)
Definition: typecmds.c:653
ObjectClass getObjectClass(const ObjectAddress *object)
Definition: dependency.c:2737
void RemoveOperatorById(Oid operOid)
Definition: operatorcmds.c:364
#define PERFORM_DELETION_CONCURRENTLY
Definition: dependency.h:134
#define ERROR
Definition: elog.h:46
void RemoveTSConfigurationById(Oid cfgId)
Definition: tsearchcmds.c:1061
void RemovePolicyById(Oid policy_id)
Definition: policy.c:335
void RemoveAttributeById(Oid relid, AttrNumber attnum)
Definition: heap.c:1661
void DeleteSequenceTuple(Oid relid)
Definition: sequence.c:526
void RemoveAttrDefaultById(Oid attrdefId)
Definition: heap.c:1829
void LargeObjectDrop(Oid loid)
static void DropObjectById(const ObjectAddress *object)
Definition: dependency.c:1215
#define Assert(condition)
Definition: c.h:804
void RemoveFunctionById(Oid funcOid)
void RemoveRewriteRuleById(Oid ruleOid)
Definition: rewriteRemove.c:39
#define elog(elevel,...)
Definition: elog.h:232
#define PERFORM_DELETION_CONCURRENT_LOCK
Definition: dependency.h:138
void heap_drop_with_catalog(Oid relid)
Definition: heap.c:1902
void RemoveConstraintById(Oid conId)

◆ DropObjectById()

static void DropObjectById ( const ObjectAddress object)
static

Definition at line 1215 of file dependency.c.

References BTEqualStrategyNumber, CatalogTupleDelete(), ObjectAddress::classId, elog, ERROR, get_object_attnum_oid(), get_object_catcache_oid(), get_object_class_descr(), get_object_oid_index(), HeapTupleIsValid, ObjectAddress::objectId, ObjectIdGetDatum, ReleaseSysCache(), RowExclusiveLock, ScanKeyInit(), SearchSysCache1(), systable_beginscan(), systable_endscan(), systable_getnext(), HeapTupleData::t_self, table_close(), and table_open().

Referenced by doDeletion().

1216 {
1217  int cacheId;
1218  Relation rel;
1219  HeapTuple tup;
1220 
1221  cacheId = get_object_catcache_oid(object->classId);
1222 
1223  rel = table_open(object->classId, RowExclusiveLock);
1224 
1225  /*
1226  * Use the system cache for the oid column, if one exists.
1227  */
1228  if (cacheId >= 0)
1229  {
1230  tup = SearchSysCache1(cacheId, ObjectIdGetDatum(object->objectId));
1231  if (!HeapTupleIsValid(tup))
1232  elog(ERROR, "cache lookup failed for %s %u",
1233  get_object_class_descr(object->classId), object->objectId);
1234 
1235  CatalogTupleDelete(rel, &tup->t_self);
1236 
1237  ReleaseSysCache(tup);
1238  }
1239  else
1240  {
1241  ScanKeyData skey[1];
1242  SysScanDesc scan;
1243 
1244  ScanKeyInit(&skey[0],
1245  get_object_attnum_oid(object->classId),
1246  BTEqualStrategyNumber, F_OIDEQ,
1247  ObjectIdGetDatum(object->objectId));
1248 
1249  scan = systable_beginscan(rel, get_object_oid_index(object->classId), true,
1250  NULL, 1, skey);
1251 
1252  /* we expect exactly one match */
1253  tup = systable_getnext(scan);
1254  if (!HeapTupleIsValid(tup))
1255  elog(ERROR, "could not find tuple for %s %u",
1256  get_object_class_descr(object->classId), object->objectId);
1257 
1258  CatalogTupleDelete(rel, &tup->t_self);
1259 
1260  systable_endscan(scan);
1261  }
1262 
1264 }
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:167
void systable_endscan(SysScanDesc sysscan)
Definition: genam.c:595
AttrNumber get_object_attnum_oid(Oid class_id)
Oid get_object_oid_index(Oid class_id)
void CatalogTupleDelete(Relation heapRel, ItemPointer tid)
Definition: indexing.c:350
SysScanDesc systable_beginscan(Relation heapRelation, Oid indexId, bool indexOK, Snapshot snapshot, int nkeys, ScanKey key)
Definition: genam.c:383
HeapTuple systable_getnext(SysScanDesc sysscan)
Definition: genam.c:502
#define ObjectIdGetDatum(X)
Definition: postgres.h:551
#define ERROR
Definition: elog.h:46
int get_object_catcache_oid(Oid class_id)
ItemPointerData t_self
Definition: htup.h:65
#define RowExclusiveLock
Definition: lockdefs.h:38
HeapTuple SearchSysCache1(int cacheId, Datum key1)
Definition: syscache.c:1127
void ReleaseSysCache(HeapTuple tuple)
Definition: syscache.c:1175
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
const char * get_object_class_descr(Oid class_id)
#define elog(elevel,...)
Definition: elog.h:232
void ScanKeyInit(ScanKey entry, AttrNumber attributeNumber, StrategyNumber strategy, RegProcedure procedure, Datum argument)
Definition: scankey.c:76
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:39
#define BTEqualStrategyNumber
Definition: stratnum.h:31

◆ eliminate_duplicate_dependencies()

static void eliminate_duplicate_dependencies ( ObjectAddresses addrs)
static

Definition at line 2323 of file dependency.c.

References Assert, ObjectAddress::classId, ObjectAddresses::extras, ObjectAddresses::numrefs, object_address_comparator(), ObjectAddress::objectId, ObjectAddress::objectSubId, qsort, and ObjectAddresses::refs.

Referenced by record_object_address_dependencies(), recordDependencyOnExpr(), and recordDependencyOnSingleRelExpr().

2324 {
2325  ObjectAddress *priorobj;
2326  int oldref,
2327  newrefs;
2328 
2329  /*
2330  * We can't sort if the array has "extra" data, because there's no way to
2331  * keep it in sync. Fortunately that combination of features is not
2332  * needed.
2333  */
2334  Assert(!addrs->extras);
2335 
2336  if (addrs->numrefs <= 1)
2337  return; /* nothing to do */
2338 
2339  /* Sort the refs so that duplicates are adjacent */
2340  qsort((void *) addrs->refs, addrs->numrefs, sizeof(ObjectAddress),
2342 
2343  /* Remove dups */
2344  priorobj = addrs->refs;
2345  newrefs = 1;
2346  for (oldref = 1; oldref < addrs->numrefs; oldref++)
2347  {
2348  ObjectAddress *thisobj = addrs->refs + oldref;
2349 
2350  if (priorobj->classId == thisobj->classId &&
2351  priorobj->objectId == thisobj->objectId)
2352  {
2353  if (priorobj->objectSubId == thisobj->objectSubId)
2354  continue; /* identical, so drop thisobj */
2355 
2356  /*
2357  * If we have a whole-object reference and a reference to a part
2358  * of the same object, we don't need the whole-object reference
2359  * (for example, we don't need to reference both table foo and
2360  * column foo.bar). The whole-object reference will always appear
2361  * first in the sorted list.
2362  */
2363  if (priorobj->objectSubId == 0)
2364  {
2365  /* replace whole ref with partial */
2366  priorobj->objectSubId = thisobj->objectSubId;
2367  continue;
2368  }
2369  }
2370  /* Not identical, so add thisobj to output set */
2371  priorobj++;
2372  *priorobj = *thisobj;
2373  newrefs++;
2374  }
2375 
2376  addrs->numrefs = newrefs;
2377 }
static int object_address_comparator(const void *a, const void *b)
Definition: dependency.c:2383
ObjectAddress * refs
Definition: dependency.c:112
#define Assert(condition)
Definition: c.h:804
ObjectAddressExtra * extras
Definition: dependency.c:113
#define qsort(a, b, c, d)
Definition: port.h:504

◆ find_expr_references_walker()

static bool find_expr_references_walker ( Node node,
find_expr_references_context context 
)
static

Definition at line 1714 of file dependency.c.

References add_object_address(), find_expr_references_context::addrs, Aggref::aggfnoid, FieldSelect::arg, CMD_INSERT, CMD_UPDATE, TableFunc::colcollations, CollateExpr::collOid, TableFunc::coltypes, Query::commandType, Const::constcollid, Const::constisnull, OnConflictExpr::constraint, Query::constraintDeps, Const::consttype, Const::constvalue, CTECycleClause::cycle_mark_collation, CTECycleClause::cycle_mark_neop, CTECycleClause::cycle_mark_type, DatumGetObjectId, elog, WindowClause::endInRangeFunc, SortGroupClause::eqop, ereport, errcode(), errmsg(), ERROR, expression_tree_walker(), exprType(), FieldSelect::fieldnum, FieldStore::fieldnums, RangeTblFunction::funccolcollations, RangeTblFunction::funccoltypes, FuncExpr::funcid, get_typ_typrelid(), getBaseType(), SetOperationStmt::groupClauses, i, WindowClause::inRangeColl, InvalidAttrNumber, IsA, RangeTblEntry::joinaliasvars, RangeTblEntry::joinmergedcols, lcons(), lfirst, lfirst_int, lfirst_oid, list_delete_first(), list_length(), list_nth(), NAMESPACEOID, ObjectIdGetDatum, OCLASS_CLASS, OCLASS_COLLATION, OCLASS_CONSTRAINT, OCLASS_OPERATOR, OCLASS_OPFAMILY, OCLASS_PROC, OCLASS_SCHEMA, OCLASS_TSCONFIG, OCLASS_TSDICT, OCLASS_TYPE, OidIsValid, OPEROID, RowCompareExpr::opfamilies, OpExpr::opno, ScalarArrayOpExpr::opno, RowCompareExpr::opnos, Param::paramcollid, Param::paramtype, PROCOID, QTW_EXAMINE_SORTGROUP, QTW_IGNORE_JOINALIASES, query_tree_walker(), SubscriptingRef::refcontainertype, SubscriptingRef::refelemtype, SubscriptingRef::refrestype, RangeTblEntry::relid, RELOID, TargetEntry::resjunk, TargetEntry::resno, FieldSelect::resultcollid, RelabelType::resultcollid, CoerceViaIO::resultcollid, ArrayCoerceExpr::resultcollid, Query::resultRelation, FieldSelect::resulttype, FieldStore::resulttype, RelabelType::resulttype, CoerceViaIO::resulttype, ArrayCoerceExpr::resulttype, ConvertRowtypeExpr::resulttype, CoerceToDomain::resulttype, RowExpr::row_typeid, rt_fetch, Query::rtable, find_expr_references_context::rtables, RTE_JOIN, RTE_RELATION, RangeTblEntry::rtekind, SearchSysCacheExists1, NextValueExpr::seqid, SortGroupClause::sortop, WindowClause::startInRangeFunc, Query::targetList, TSCONFIGOID, TSDICTOID, TableSampleClause::tsmhandler, TYPEOID, Var::varattno, Var::varlevelsup, Var::varno, and WindowFunc::winfnoid.

Referenced by recordDependencyOnExpr(), and recordDependencyOnSingleRelExpr().

1716 {
1717  if (node == NULL)
1718  return false;
1719  if (IsA(node, Var))
1720  {
1721  Var *var = (Var *) node;
1722  List *rtable;
1723  RangeTblEntry *rte;
1724 
1725  /* Find matching rtable entry, or complain if not found */
1726  if (var->varlevelsup >= list_length(context->rtables))
1727  elog(ERROR, "invalid varlevelsup %d", var->varlevelsup);
1728  rtable = (List *) list_nth(context->rtables, var->varlevelsup);
1729  if (var->varno <= 0 || var->varno > list_length(rtable))
1730  elog(ERROR, "invalid varno %d", var->varno);
1731  rte = rt_fetch(var->varno, rtable);
1732 
1733  /*
1734  * A whole-row Var references no specific columns, so adds no new
1735  * dependency. (We assume that there is a whole-table dependency
1736  * arising from each underlying rangetable entry. While we could
1737  * record such a dependency when finding a whole-row Var that
1738  * references a relation directly, it's quite unclear how to extend
1739  * that to whole-row Vars for JOINs, so it seems better to leave the
1740  * responsibility with the range table. Note that this poses some
1741  * risks for identifying dependencies of stand-alone expressions:
1742  * whole-table references may need to be created separately.)
1743  */
1744  if (var->varattno == InvalidAttrNumber)
1745  return false;
1746  if (rte->rtekind == RTE_RELATION)
1747  {
1748  /* If it's a plain relation, reference this column */
1750  context->addrs);
1751  }
1752 
1753  /*
1754  * Vars referencing other RTE types require no additional work. In
1755  * particular, a join alias Var can be ignored, because it must
1756  * reference a merged USING column. The relevant join input columns
1757  * will also be referenced in the join qual, and any type coercion
1758  * functions involved in the alias expression will be dealt with when
1759  * we scan the RTE itself.
1760  */
1761  return false;
1762  }
1763  else if (IsA(node, Const))
1764  {
1765  Const *con = (Const *) node;
1766  Oid objoid;
1767 
1768  /* A constant must depend on the constant's datatype */
1770  context->addrs);
1771 
1772  /*
1773  * We must also depend on the constant's collation: it could be
1774  * different from the datatype's, if a CollateExpr was const-folded to
1775  * a simple constant. However we can save work in the most common
1776  * case where the collation is "default", since we know that's pinned.
1777  */
1778  if (OidIsValid(con->constcollid) &&
1779  con->constcollid != DEFAULT_COLLATION_OID)
1781  context->addrs);
1782 
1783  /*
1784  * If it's a regclass or similar literal referring to an existing
1785  * object, add a reference to that object. (Currently, only the
1786  * regclass and regconfig cases have any likely use, but we may as
1787  * well handle all the OID-alias datatypes consistently.)
1788  */
1789  if (!con->constisnull)
1790  {
1791  switch (con->consttype)
1792  {
1793  case REGPROCOID:
1794  case REGPROCEDUREOID:
1795  objoid = DatumGetObjectId(con->constvalue);
1797  ObjectIdGetDatum(objoid)))
1798  add_object_address(OCLASS_PROC, objoid, 0,
1799  context->addrs);
1800  break;
1801  case REGOPEROID:
1802  case REGOPERATOROID:
1803  objoid = DatumGetObjectId(con->constvalue);
1805  ObjectIdGetDatum(objoid)))
1807  context->addrs);
1808  break;
1809  case REGCLASSOID:
1810  objoid = DatumGetObjectId(con->constvalue);
1812  ObjectIdGetDatum(objoid)))
1813  add_object_address(OCLASS_CLASS, objoid, 0,
1814  context->addrs);
1815  break;
1816  case REGTYPEOID:
1817  objoid = DatumGetObjectId(con->constvalue);
1819  ObjectIdGetDatum(objoid)))
1820  add_object_address(OCLASS_TYPE, objoid, 0,
1821  context->addrs);
1822  break;
1823  case REGCONFIGOID:
1824  objoid = DatumGetObjectId(con->constvalue);
1826  ObjectIdGetDatum(objoid)))
1828  context->addrs);
1829  break;
1830  case REGDICTIONARYOID:
1831  objoid = DatumGetObjectId(con->constvalue);
1833  ObjectIdGetDatum(objoid)))
1834  add_object_address(OCLASS_TSDICT, objoid, 0,
1835  context->addrs);
1836  break;
1837 
1838  case REGNAMESPACEOID:
1839  objoid = DatumGetObjectId(con->constvalue);
1841  ObjectIdGetDatum(objoid)))
1842  add_object_address(OCLASS_SCHEMA, objoid, 0,
1843  context->addrs);
1844  break;
1845 
1846  /*
1847  * Dependencies for regrole should be shared among all
1848  * databases, so explicitly inhibit to have dependencies.
1849  */
1850  case REGROLEOID:
1851  ereport(ERROR,
1852  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1853  errmsg("constant of the type %s cannot be used here",
1854  "regrole")));
1855  break;
1856  }
1857  }
1858  return false;
1859  }
1860  else if (IsA(node, Param))
1861  {
1862  Param *param = (Param *) node;
1863 
1864  /* A parameter must depend on the parameter's datatype */
1866  context->addrs);
1867  /* and its collation, just as for Consts */
1868  if (OidIsValid(param->paramcollid) &&
1869  param->paramcollid != DEFAULT_COLLATION_OID)
1871  context->addrs);
1872  }
1873  else if (IsA(node, FuncExpr))
1874  {
1875  FuncExpr *funcexpr = (FuncExpr *) node;
1876 
1877  add_object_address(OCLASS_PROC, funcexpr->funcid, 0,
1878  context->addrs);
1879  /* fall through to examine arguments */
1880  }
1881  else if (IsA(node, OpExpr))
1882  {
1883  OpExpr *opexpr = (OpExpr *) node;
1884 
1886  context->addrs);
1887  /* fall through to examine arguments */
1888  }
1889  else if (IsA(node, DistinctExpr))
1890  {
1891  DistinctExpr *distinctexpr = (DistinctExpr *) node;
1892 
1893  add_object_address(OCLASS_OPERATOR, distinctexpr->opno, 0,
1894  context->addrs);
1895  /* fall through to examine arguments */
1896  }
1897  else if (IsA(node, NullIfExpr))
1898  {
1899  NullIfExpr *nullifexpr = (NullIfExpr *) node;
1900 
1901  add_object_address(OCLASS_OPERATOR, nullifexpr->opno, 0,
1902  context->addrs);
1903  /* fall through to examine arguments */
1904  }
1905  else if (IsA(node, ScalarArrayOpExpr))
1906  {
1907  ScalarArrayOpExpr *opexpr = (ScalarArrayOpExpr *) node;
1908 
1910  context->addrs);
1911  /* fall through to examine arguments */
1912  }
1913  else if (IsA(node, Aggref))
1914  {
1915  Aggref *aggref = (Aggref *) node;
1916 
1918  context->addrs);
1919  /* fall through to examine arguments */
1920  }
1921  else if (IsA(node, WindowFunc))
1922  {
1923  WindowFunc *wfunc = (WindowFunc *) node;
1924 
1926  context->addrs);
1927  /* fall through to examine arguments */
1928  }
1929  else if (IsA(node, SubscriptingRef))
1930  {
1931  SubscriptingRef *sbsref = (SubscriptingRef *) node;
1932 
1933  /*
1934  * The refexpr should provide adequate dependency on refcontainertype,
1935  * and that type in turn depends on refelemtype. However, a custom
1936  * subscripting handler might set refrestype to something different
1937  * from either of those, in which case we'd better record it.
1938  */
1939  if (sbsref->refrestype != sbsref->refcontainertype &&
1940  sbsref->refrestype != sbsref->refelemtype)
1942  context->addrs);
1943  /* fall through to examine arguments */
1944  }
1945  else if (IsA(node, SubPlan))
1946  {
1947  /* Extra work needed here if we ever need this case */
1948  elog(ERROR, "already-planned subqueries not supported");
1949  }
1950  else if (IsA(node, FieldSelect))
1951  {
1952  FieldSelect *fselect = (FieldSelect *) node;
1953  Oid argtype = getBaseType(exprType((Node *) fselect->arg));
1954  Oid reltype = get_typ_typrelid(argtype);
1955 
1956  /*
1957  * We need a dependency on the specific column named in FieldSelect,
1958  * assuming we can identify the pg_class OID for it. (Probably we
1959  * always can at the moment, but in future it might be possible for
1960  * argtype to be RECORDOID.) If we can make a column dependency then
1961  * we shouldn't need a dependency on the column's type; but if we
1962  * can't, make a dependency on the type, as it might not appear
1963  * anywhere else in the expression.
1964  */
1965  if (OidIsValid(reltype))
1966  add_object_address(OCLASS_CLASS, reltype, fselect->fieldnum,
1967  context->addrs);
1968  else
1970  context->addrs);
1971  /* the collation might not be referenced anywhere else, either */
1972  if (OidIsValid(fselect->resultcollid) &&
1973  fselect->resultcollid != DEFAULT_COLLATION_OID)
1975  context->addrs);
1976  }
1977  else if (IsA(node, FieldStore))
1978  {
1979  FieldStore *fstore = (FieldStore *) node;
1980  Oid reltype = get_typ_typrelid(fstore->resulttype);
1981 
1982  /* similar considerations to FieldSelect, but multiple column(s) */
1983  if (OidIsValid(reltype))
1984  {
1985  ListCell *l;
1986 
1987  foreach(l, fstore->fieldnums)
1989  context->addrs);
1990  }
1991  else
1993  context->addrs);
1994  }
1995  else if (IsA(node, RelabelType))
1996  {
1997  RelabelType *relab = (RelabelType *) node;
1998 
1999  /* since there is no function dependency, need to depend on type */
2001  context->addrs);
2002  /* the collation might not be referenced anywhere else, either */
2003  if (OidIsValid(relab->resultcollid) &&
2004  relab->resultcollid != DEFAULT_COLLATION_OID)
2006  context->addrs);
2007  }
2008  else if (IsA(node, CoerceViaIO))
2009  {
2010  CoerceViaIO *iocoerce = (CoerceViaIO *) node;
2011 
2012  /* since there is no exposed function, need to depend on type */
2014  context->addrs);
2015  /* the collation might not be referenced anywhere else, either */
2016  if (OidIsValid(iocoerce->resultcollid) &&
2017  iocoerce->resultcollid != DEFAULT_COLLATION_OID)
2019  context->addrs);
2020  }
2021  else if (IsA(node, ArrayCoerceExpr))
2022  {
2023  ArrayCoerceExpr *acoerce = (ArrayCoerceExpr *) node;
2024 
2025  /* as above, depend on type */
2027  context->addrs);
2028  /* the collation might not be referenced anywhere else, either */
2029  if (OidIsValid(acoerce->resultcollid) &&
2030  acoerce->resultcollid != DEFAULT_COLLATION_OID)
2032  context->addrs);
2033  /* fall through to examine arguments */
2034  }
2035  else if (IsA(node, ConvertRowtypeExpr))
2036  {
2037  ConvertRowtypeExpr *cvt = (ConvertRowtypeExpr *) node;
2038 
2039  /* since there is no function dependency, need to depend on type */
2041  context->addrs);
2042  }
2043  else if (IsA(node, CollateExpr))
2044  {
2045  CollateExpr *coll = (CollateExpr *) node;
2046 
2048  context->addrs);
2049  }
2050  else if (IsA(node, RowExpr))
2051  {
2052  RowExpr *rowexpr = (RowExpr *) node;
2053 
2055  context->addrs);
2056  }
2057  else if (IsA(node, RowCompareExpr))
2058  {
2059  RowCompareExpr *rcexpr = (RowCompareExpr *) node;
2060  ListCell *l;
2061 
2062  foreach(l, rcexpr->opnos)
2063  {
2065  context->addrs);
2066  }
2067  foreach(l, rcexpr->opfamilies)
2068  {
2070  context->addrs);
2071  }
2072  /* fall through to examine arguments */
2073  }
2074  else if (IsA(node, CoerceToDomain))
2075  {
2076  CoerceToDomain *cd = (CoerceToDomain *) node;
2077 
2079  context->addrs);
2080  }
2081  else if (IsA(node, NextValueExpr))
2082  {
2083  NextValueExpr *nve = (NextValueExpr *) node;
2084 
2086  context->addrs);
2087  }
2088  else if (IsA(node, OnConflictExpr))
2089  {
2090  OnConflictExpr *onconflict = (OnConflictExpr *) node;
2091 
2092  if (OidIsValid(onconflict->constraint))
2094  context->addrs);
2095  /* fall through to examine arguments */
2096  }
2097  else if (IsA(node, SortGroupClause))
2098  {
2099  SortGroupClause *sgc = (SortGroupClause *) node;
2100 
2102  context->addrs);
2103  if (OidIsValid(sgc->sortop))
2105  context->addrs);
2106  return false;
2107  }
2108  else if (IsA(node, WindowClause))
2109  {
2110  WindowClause *wc = (WindowClause *) node;
2111 
2112  if (OidIsValid(wc->startInRangeFunc))
2114  context->addrs);
2115  if (OidIsValid(wc->endInRangeFunc))
2117  context->addrs);
2118  if (OidIsValid(wc->inRangeColl) &&
2119  wc->inRangeColl != DEFAULT_COLLATION_OID)
2121  context->addrs);
2122  /* fall through to examine substructure */
2123  }
2124  else if (IsA(node, CTECycleClause))
2125  {
2126  CTECycleClause *cc = (CTECycleClause *) node;
2127 
2128  if (OidIsValid(cc->cycle_mark_type))
2130  context->addrs);
2133  context->addrs);
2134  if (OidIsValid(cc->cycle_mark_neop))
2136  context->addrs);
2137  /* fall through to examine substructure */
2138  }
2139  else if (IsA(node, Query))
2140  {
2141  /* Recurse into RTE subquery or not-yet-planned sublink subquery */
2142  Query *query = (Query *) node;
2143  ListCell *lc;
2144  bool result;
2145 
2146  /*
2147  * Add whole-relation refs for each plain relation mentioned in the
2148  * subquery's rtable, and ensure we add refs for any type-coercion
2149  * functions used in join alias lists.
2150  *
2151  * Note: query_tree_walker takes care of recursing into RTE_FUNCTION
2152  * RTEs, subqueries, etc, so no need to do that here. But we must
2153  * tell it not to visit join alias lists, or we'll add refs for join
2154  * input columns whether or not they are actually used in our query.
2155  *
2156  * Note: we don't need to worry about collations mentioned in
2157  * RTE_VALUES or RTE_CTE RTEs, because those must just duplicate
2158  * collations referenced in other parts of the Query. We do have to
2159  * worry about collations mentioned in RTE_FUNCTION, but we take care
2160  * of those when we recurse to the RangeTblFunction node(s).
2161  */
2162  foreach(lc, query->rtable)
2163  {
2164  RangeTblEntry *rte = (RangeTblEntry *) lfirst(lc);
2165 
2166  switch (rte->rtekind)
2167  {
2168  case RTE_RELATION:
2170  context->addrs);
2171  break;
2172  case RTE_JOIN:
2173 
2174  /*
2175  * Examine joinaliasvars entries only for merged JOIN
2176  * USING columns. Only those entries could contain
2177  * type-coercion functions. Also, their join input
2178  * columns must be referenced in the join quals, so this
2179  * won't accidentally add refs to otherwise-unused join
2180  * input columns. (We want to ref the type coercion
2181  * functions even if the merged column isn't explicitly
2182  * used anywhere, to protect possible expansion of the
2183  * join RTE as a whole-row var, and because it seems like
2184  * a bad idea to allow dropping a function that's present
2185  * in our query tree, whether or not it could get called.)
2186  */
2187  context->rtables = lcons(query->rtable, context->rtables);
2188  for (int i = 0; i < rte->joinmergedcols; i++)
2189  {
2190  Node *aliasvar = list_nth(rte->joinaliasvars, i);
2191 
2192  if (!IsA(aliasvar, Var))
2193  find_expr_references_walker(aliasvar, context);
2194  }
2195  context->rtables = list_delete_first(context->rtables);
2196  break;
2197  default:
2198  break;
2199  }
2200  }
2201 
2202  /*
2203  * If the query is an INSERT or UPDATE, we should create a dependency
2204  * on each target column, to prevent the specific target column from
2205  * being dropped. Although we will visit the TargetEntry nodes again
2206  * during query_tree_walker, we won't have enough context to do this
2207  * conveniently, so do it here.
2208  */
2209  if (query->commandType == CMD_INSERT ||
2210  query->commandType == CMD_UPDATE)
2211  {
2212  RangeTblEntry *rte;
2213 
2214  if (query->resultRelation <= 0 ||
2215  query->resultRelation > list_length(query->rtable))
2216  elog(ERROR, "invalid resultRelation %d",
2217  query->resultRelation);
2218  rte = rt_fetch(query->resultRelation, query->rtable);
2219  if (rte->rtekind == RTE_RELATION)
2220  {
2221  foreach(lc, query->targetList)
2222  {
2223  TargetEntry *tle = (TargetEntry *) lfirst(lc);
2224 
2225  if (tle->resjunk)
2226  continue; /* ignore junk tlist items */
2228  context->addrs);
2229  }
2230  }
2231  }
2232 
2233  /*
2234  * Add dependencies on constraints listed in query's constraintDeps
2235  */
2236  foreach(lc, query->constraintDeps)
2237  {
2239  context->addrs);
2240  }
2241 
2242  /* Examine substructure of query */
2243  context->rtables = lcons(query->rtable, context->rtables);
2244  result = query_tree_walker(query,
2246  (void *) context,
2249  context->rtables = list_delete_first(context->rtables);
2250  return result;
2251  }
2252  else if (IsA(node, SetOperationStmt))
2253  {
2254  SetOperationStmt *setop = (SetOperationStmt *) node;
2255 
2256  /* we need to look at the groupClauses for operator references */
2257  find_expr_references_walker((Node *) setop->groupClauses, context);
2258  /* fall through to examine child nodes */
2259  }
2260  else if (IsA(node, RangeTblFunction))
2261  {
2262  RangeTblFunction *rtfunc = (RangeTblFunction *) node;
2263  ListCell *ct;
2264 
2265  /*
2266  * Add refs for any datatypes and collations used in a column
2267  * definition list for a RECORD function. (For other cases, it should
2268  * be enough to depend on the function itself.)
2269  */
2270  foreach(ct, rtfunc->funccoltypes)
2271  {
2273  context->addrs);
2274  }
2275  foreach(ct, rtfunc->funccolcollations)
2276  {
2277  Oid collid = lfirst_oid(ct);
2278 
2279  if (OidIsValid(collid) && collid != DEFAULT_COLLATION_OID)
2281  context->addrs);
2282  }
2283  }
2284  else if (IsA(node, TableFunc))
2285  {
2286  TableFunc *tf = (TableFunc *) node;
2287  ListCell *ct;
2288 
2289  /*
2290  * Add refs for the datatypes and collations used in the TableFunc.
2291  */
2292  foreach(ct, tf->coltypes)
2293  {
2295  context->addrs);
2296  }
2297  foreach(ct, tf->colcollations)
2298  {
2299  Oid collid = lfirst_oid(ct);
2300 
2301  if (OidIsValid(collid) && collid != DEFAULT_COLLATION_OID)
2303  context->addrs);
2304  }
2305  }
2306  else if (IsA(node, TableSampleClause))
2307  {
2308  TableSampleClause *tsc = (TableSampleClause *) node;
2309 
2311  context->addrs);
2312  /* fall through to examine arguments */
2313  }
2314 
2316  (void *) context);
2317 }
Datum constvalue
Definition: primnodes.h:219
bool query_tree_walker(Query *query, bool(*walker)(), void *context, int flags)
Definition: nodeFuncs.c:2355
#define IsA(nodeptr, _type_)
Definition: nodes.h:590
List * joinaliasvars
Definition: parsenodes.h:1070
Index varlevelsup
Definition: primnodes.h:196
static bool find_expr_references_walker(Node *node, find_expr_references_context *context)
Definition: dependency.c:1714
Oid resulttype
Definition: primnodes.h:810
ObjectAddresses * addrs
Definition: dependency.c:138
List * constraintDeps
Definition: parsenodes.h:180
#define DatumGetObjectId(X)
Definition: postgres.h:544
Oid resulttype
Definition: primnodes.h:881
#define QTW_EXAMINE_SORTGROUP
Definition: nodeFuncs.h:30
List * opfamilies
Definition: primnodes.h:1118
int resultRelation
Definition: parsenodes.h:130
Oid endInRangeFunc
Definition: parsenodes.h:1385
Definition: nodes.h:539
int errcode(int sqlerrcode)
Definition: elog.c:698
AttrNumber varattno
Definition: primnodes.h:191
Expr * arg
Definition: primnodes.h:808
unsigned int Oid
Definition: postgres_ext.h:31
Definition: primnodes.h:186
#define OidIsValid(objectId)
Definition: c.h:710
List * colcollations
Definition: primnodes.h:92
List * targetList
Definition: parsenodes.h:150
Oid consttype
Definition: primnodes.h:215
#define SearchSysCacheExists1(cacheId, key1)
Definition: syscache.h:184
Oid get_typ_typrelid(Oid typid)
Definition: lsyscache.c:2678
bool resjunk
Definition: primnodes.h:1461
List * rtable
Definition: parsenodes.h:147
Oid funcid
Definition: primnodes.h:495
#define ObjectIdGetDatum(X)
Definition: postgres.h:551
#define ERROR
Definition: elog.h:46
Oid paramcollid
Definition: primnodes.h:271
#define lfirst_int(lc)
Definition: pg_list.h:170
static void * list_nth(const List *list, int n)
Definition: pg_list.h:278
Oid constcollid
Definition: primnodes.h:217
Oid resultcollid
Definition: primnodes.h:813
AttrNumber resno
Definition: primnodes.h:1455
Oid resulttype
Definition: primnodes.h:840
Oid winfnoid
Definition: primnodes.h:386
#define rt_fetch(rangetable_index, rangetable)
Definition: parsetree.h:31
Index varno
Definition: primnodes.h:189
Oid resultcollid
Definition: primnodes.h:883
Oid resulttype
Definition: primnodes.h:861
Oid cycle_mark_collation
Definition: parsenodes.h:1493
List * coltypes
Definition: primnodes.h:90
Oid resultcollid
Definition: primnodes.h:863
Oid aggfnoid
Definition: primnodes.h:323
#define ereport(elevel,...)
Definition: elog.h:157
CmdType commandType
Definition: parsenodes.h:120
List * lcons(void *datum, List *list)
Definition: list.c:468
List * funccolcollations
Definition: parsenodes.h:1180
#define lfirst(lc)
Definition: pg_list.h:169
Oid exprType(const Node *expr)
Definition: nodeFuncs.c:41
bool expression_tree_walker(Node *node, bool(*walker)(), void *context)
Definition: nodeFuncs.c:1904
Oid row_typeid
Definition: primnodes.h:1069
static int list_length(const List *l)
Definition: pg_list.h:149
#define InvalidAttrNumber
Definition: attnum.h:23
RTEKind rtekind
Definition: parsenodes.h:995
int errmsg(const char *fmt,...)
Definition: elog.c:909
List * fieldnums
Definition: primnodes.h:839
#define elog(elevel,...)
Definition: elog.h:232
int i
Oid refcontainertype
Definition: primnodes.h:439
Oid opno
Definition: primnodes.h:542
Oid getBaseType(Oid typid)
Definition: lsyscache.c:2468
Definition: pg_list.h:50
static void add_object_address(ObjectClass oclass, Oid objectId, int32 subId, ObjectAddresses *addrs)
Definition: dependency.c:2449
Oid startInRangeFunc
Definition: parsenodes.h:1384
Oid paramtype
Definition: primnodes.h:269
bool constisnull
Definition: primnodes.h:220
#define lfirst_oid(lc)
Definition: pg_list.h:171
List * list_delete_first(List *list)
Definition: list.c:875
#define QTW_IGNORE_JOINALIASES
Definition: nodeFuncs.h:23
AttrNumber fieldnum
Definition: primnodes.h:809

◆ findDependentObjects()

static void findDependentObjects ( const ObjectAddress object,
int  objflags,
int  flags,
ObjectAddressStack stack,
ObjectAddresses targetObjects,
const ObjectAddresses pendingObjects,
Relation depRel 
)
static

Definition at line 472 of file dependency.c.

References AcquireDeletionLock(), add_exact_object_address_extra(), BTEqualStrategyNumber, ObjectAddress::classId, creating_extension, CurrentExtensionObject, ObjectAddressExtra::dependee, DEPENDENCY_AUTO, DEPENDENCY_AUTO_EXTENSION, DEPENDENCY_EXTENSION, DEPENDENCY_INTERNAL, DEPENDENCY_NORMAL, DEPENDENCY_PARTITION_PRI, DEPENDENCY_PARTITION_SEC, DEPFLAG_AUTO, DEPFLAG_EXTENSION, DEPFLAG_INTERNAL, DEPFLAG_IS_PART, DEPFLAG_NORMAL, DEPFLAG_PARTITION, DEPFLAG_REVERSE, elog, ereport, errcode(), errhint(), errmsg(), ERROR, ObjectAddressExtra::flags, ObjectAddressStack::flags, getObjectDescription(), GETSTRUCT, HeapTupleIsValid, i, Int32GetDatum, IsPinnedObject(), sort-test::key, ObjectAddressStack::next, ObjectAddressAndFlags::obj, ObjectAddressStack::object, object_address_comparator(), object_address_present(), object_address_present_add_flags(), ObjectAddress::objectId, ObjectIdGetDatum, ObjectAddress::objectSubId, OidIsValid, palloc(), PERFORM_DELETION_SKIP_EXTENSIONS, pfree(), qsort, ReleaseDeletionLock(), repalloc(), ScanKeyInit(), stack_address_present_add_flags(), ObjectAddressAndFlags::subflags, systable_beginscan(), systable_endscan(), systable_getnext(), and systable_recheck_tuple().

Referenced by performDeletion(), and performMultipleDeletions().

479 {
480  ScanKeyData key[3];
481  int nkeys;
482  SysScanDesc scan;
483  HeapTuple tup;
484  ObjectAddress otherObject;
485  ObjectAddress owningObject;
486  ObjectAddress partitionObject;
487  ObjectAddressAndFlags *dependentObjects;
488  int numDependentObjects;
489  int maxDependentObjects;
490  ObjectAddressStack mystack;
491  ObjectAddressExtra extra;
492 
493  /*
494  * If the target object is already being visited in an outer recursion
495  * level, just report the current objflags back to that level and exit.
496  * This is needed to avoid infinite recursion in the face of circular
497  * dependencies.
498  *
499  * The stack check alone would result in dependency loops being broken at
500  * an arbitrary point, ie, the first member object of the loop to be
501  * visited is the last one to be deleted. This is obviously unworkable.
502  * However, the check for internal dependency below guarantees that we
503  * will not break a loop at an internal dependency: if we enter the loop
504  * at an "owned" object we will switch and start at the "owning" object
505  * instead. We could probably hack something up to avoid breaking at an
506  * auto dependency, too, if we had to. However there are no known cases
507  * where that would be necessary.
508  */
509  if (stack_address_present_add_flags(object, objflags, stack))
510  return;
511 
512  /*
513  * It's also possible that the target object has already been completely
514  * processed and put into targetObjects. If so, again we just add the
515  * specified objflags to its entry and return.
516  *
517  * (Note: in these early-exit cases we could release the caller-taken
518  * lock, since the object is presumably now locked multiple times; but it
519  * seems not worth the cycles.)
520  */
521  if (object_address_present_add_flags(object, objflags, targetObjects))
522  return;
523 
524  /*
525  * If the target object is pinned, we can just error out immediately; it
526  * won't have any objects recorded as depending on it.
527  */
528  if (IsPinnedObject(object->classId, object->objectId))
529  ereport(ERROR,
530  (errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
531  errmsg("cannot drop %s because it is required by the database system",
532  getObjectDescription(object, false))));
533 
534  /*
535  * The target object might be internally dependent on some other object
536  * (its "owner"), and/or be a member of an extension (also considered its
537  * owner). If so, and if we aren't recursing from the owning object, we
538  * have to transform this deletion request into a deletion request of the
539  * owning object. (We'll eventually recurse back to this object, but the
540  * owning object has to be visited first so it will be deleted after.) The
541  * way to find out about this is to scan the pg_depend entries that show
542  * what this object depends on.
543  */
544  ScanKeyInit(&key[0],
545  Anum_pg_depend_classid,
546  BTEqualStrategyNumber, F_OIDEQ,
547  ObjectIdGetDatum(object->classId));
548  ScanKeyInit(&key[1],
549  Anum_pg_depend_objid,
550  BTEqualStrategyNumber, F_OIDEQ,
551  ObjectIdGetDatum(object->objectId));
552  if (object->objectSubId != 0)
553  {
554  /* Consider only dependencies of this sub-object */
555  ScanKeyInit(&key[2],
556  Anum_pg_depend_objsubid,
557  BTEqualStrategyNumber, F_INT4EQ,
558  Int32GetDatum(object->objectSubId));
559  nkeys = 3;
560  }
561  else
562  {
563  /* Consider dependencies of this object and any sub-objects it has */
564  nkeys = 2;
565  }
566 
567  scan = systable_beginscan(*depRel, DependDependerIndexId, true,
568  NULL, nkeys, key);
569 
570  /* initialize variables that loop may fill */
571  memset(&owningObject, 0, sizeof(owningObject));
572  memset(&partitionObject, 0, sizeof(partitionObject));
573 
574  while (HeapTupleIsValid(tup = systable_getnext(scan)))
575  {
576  Form_pg_depend foundDep = (Form_pg_depend) GETSTRUCT(tup);
577 
578  otherObject.classId = foundDep->refclassid;
579  otherObject.objectId = foundDep->refobjid;
580  otherObject.objectSubId = foundDep->refobjsubid;
581 
582  /*
583  * When scanning dependencies of a whole object, we may find rows
584  * linking sub-objects of the object to the object itself. (Normally,
585  * such a dependency is implicit, but we must make explicit ones in
586  * some cases involving partitioning.) We must ignore such rows to
587  * avoid infinite recursion.
588  */
589  if (otherObject.classId == object->classId &&
590  otherObject.objectId == object->objectId &&
591  object->objectSubId == 0)
592  continue;
593 
594  switch (foundDep->deptype)
595  {
596  case DEPENDENCY_NORMAL:
597  case DEPENDENCY_AUTO:
599  /* no problem */
600  break;
601 
603 
604  /*
605  * If told to, ignore EXTENSION dependencies altogether. This
606  * flag is normally used to prevent dropping extensions during
607  * temporary-object cleanup, even if a temp object was created
608  * during an extension script.
609  */
611  break;
612 
613  /*
614  * If the other object is the extension currently being
615  * created/altered, ignore this dependency and continue with
616  * the deletion. This allows dropping of an extension's
617  * objects within the extension's scripts, as well as corner
618  * cases such as dropping a transient object created within
619  * such a script.
620  */
621  if (creating_extension &&
622  otherObject.classId == ExtensionRelationId &&
623  otherObject.objectId == CurrentExtensionObject)
624  break;
625 
626  /* Otherwise, treat this like an internal dependency */
627  /* FALL THRU */
628 
629  case DEPENDENCY_INTERNAL:
630 
631  /*
632  * This object is part of the internal implementation of
633  * another object, or is part of the extension that is the
634  * other object. We have three cases:
635  *
636  * 1. At the outermost recursion level, we must disallow the
637  * DROP. However, if the owning object is listed in
638  * pendingObjects, just release the caller's lock and return;
639  * we'll eventually complete the DROP when we reach that entry
640  * in the pending list.
641  *
642  * Note: the above statement is true only if this pg_depend
643  * entry still exists by then; in principle, therefore, we
644  * could miss deleting an item the user told us to delete.
645  * However, no inconsistency can result: since we're at outer
646  * level, there is no object depending on this one.
647  */
648  if (stack == NULL)
649  {
650  if (pendingObjects &&
651  object_address_present(&otherObject, pendingObjects))
652  {
653  systable_endscan(scan);
654  /* need to release caller's lock; see notes below */
655  ReleaseDeletionLock(object);
656  return;
657  }
658 
659  /*
660  * We postpone actually issuing the error message until
661  * after this loop, so that we can make the behavior
662  * independent of the ordering of pg_depend entries, at
663  * least if there's not more than one INTERNAL and one
664  * EXTENSION dependency. (If there's more, we'll complain
665  * about a random one of them.) Prefer to complain about
666  * EXTENSION, since that's generally a more important
667  * dependency.
668  */
669  if (!OidIsValid(owningObject.classId) ||
670  foundDep->deptype == DEPENDENCY_EXTENSION)
671  owningObject = otherObject;
672  break;
673  }
674 
675  /*
676  * 2. When recursing from the other end of this dependency,
677  * it's okay to continue with the deletion. This holds when
678  * recursing from a whole object that includes the nominal
679  * other end as a component, too. Since there can be more
680  * than one "owning" object, we have to allow matches that are
681  * more than one level down in the stack.
682  */
683  if (stack_address_present_add_flags(&otherObject, 0, stack))
684  break;
685 
686  /*
687  * 3. Not all the owning objects have been visited, so
688  * transform this deletion request into a delete of this
689  * owning object.
690  *
691  * First, release caller's lock on this object and get
692  * deletion lock on the owning object. (We must release
693  * caller's lock to avoid deadlock against a concurrent
694  * deletion of the owning object.)
695  */
696  ReleaseDeletionLock(object);
697  AcquireDeletionLock(&otherObject, 0);
698 
699  /*
700  * The owning object might have been deleted while we waited
701  * to lock it; if so, neither it nor the current object are
702  * interesting anymore. We test this by checking the
703  * pg_depend entry (see notes below).
704  */
705  if (!systable_recheck_tuple(scan, tup))
706  {
707  systable_endscan(scan);
708  ReleaseDeletionLock(&otherObject);
709  return;
710  }
711 
712  /*
713  * One way or the other, we're done with the scan; might as
714  * well close it down before recursing, to reduce peak
715  * resource consumption.
716  */
717  systable_endscan(scan);
718 
719  /*
720  * Okay, recurse to the owning object instead of proceeding.
721  *
722  * We do not need to stack the current object; we want the
723  * traversal order to be as if the original reference had
724  * linked to the owning object instead of this one.
725  *
726  * The dependency type is a "reverse" dependency: we need to
727  * delete the owning object if this one is to be deleted, but
728  * this linkage is never a reason for an automatic deletion.
729  */
730  findDependentObjects(&otherObject,
732  flags,
733  stack,
734  targetObjects,
735  pendingObjects,
736  depRel);
737 
738  /*
739  * The current target object should have been added to
740  * targetObjects while processing the owning object; but it
741  * probably got only the flag bits associated with the
742  * dependency we're looking at. We need to add the objflags
743  * that were passed to this recursion level, too, else we may
744  * get a bogus failure in reportDependentObjects (if, for
745  * example, we were called due to a partition dependency).
746  *
747  * If somehow the current object didn't get scheduled for
748  * deletion, bleat. (That would imply that somebody deleted
749  * this dependency record before the recursion got to it.)
750  * Another idea would be to reacquire lock on the current
751  * object and resume trying to delete it, but it seems not
752  * worth dealing with the race conditions inherent in that.
753  */
754  if (!object_address_present_add_flags(object, objflags,
755  targetObjects))
756  elog(ERROR, "deletion of owning object %s failed to delete %s",
757  getObjectDescription(&otherObject, false),
758  getObjectDescription(object, false));
759 
760  /* And we're done here. */
761  return;
762 
764 
765  /*
766  * Remember that this object has a partition-type dependency.
767  * After the dependency scan, we'll complain if we didn't find
768  * a reason to delete one of its partition dependencies.
769  */
770  objflags |= DEPFLAG_IS_PART;
771 
772  /*
773  * Also remember the primary partition owner, for error
774  * messages. If there are multiple primary owners (which
775  * there should not be), we'll report a random one of them.
776  */
777  partitionObject = otherObject;
778  break;
779 
781 
782  /*
783  * Only use secondary partition owners in error messages if we
784  * find no primary owner (which probably shouldn't happen).
785  */
786  if (!(objflags & DEPFLAG_IS_PART))
787  partitionObject = otherObject;
788 
789  /*
790  * Remember that this object has a partition-type dependency.
791  * After the dependency scan, we'll complain if we didn't find
792  * a reason to delete one of its partition dependencies.
793  */
794  objflags |= DEPFLAG_IS_PART;
795  break;
796 
797  default:
798  elog(ERROR, "unrecognized dependency type '%c' for %s",
799  foundDep->deptype, getObjectDescription(object, false));
800  break;
801  }
802  }
803 
804  systable_endscan(scan);
805 
806  /*
807  * If we found an INTERNAL or EXTENSION dependency when we're at outer
808  * level, complain about it now. If we also found a PARTITION dependency,
809  * we prefer to report the PARTITION dependency. This is arbitrary but
810  * seems to be more useful in practice.
811  */
812  if (OidIsValid(owningObject.classId))
813  {
814  char *otherObjDesc;
815 
816  if (OidIsValid(partitionObject.classId))
817  otherObjDesc = getObjectDescription(&partitionObject, false);
818  else
819  otherObjDesc = getObjectDescription(&owningObject, false);
820 
821  ereport(ERROR,
822  (errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
823  errmsg("cannot drop %s because %s requires it",
824  getObjectDescription(object, false), otherObjDesc),
825  errhint("You can drop %s instead.", otherObjDesc)));
826  }
827 
828  /*
829  * Next, identify all objects that directly depend on the current object.
830  * To ensure predictable deletion order, we collect them up in
831  * dependentObjects and sort the list before actually recursing. (The
832  * deletion order would be valid in any case, but doing this ensures
833  * consistent output from DROP CASCADE commands, which is helpful for
834  * regression testing.)
835  */
836  maxDependentObjects = 128; /* arbitrary initial allocation */
837  dependentObjects = (ObjectAddressAndFlags *)
838  palloc(maxDependentObjects * sizeof(ObjectAddressAndFlags));
839  numDependentObjects = 0;
840 
841  ScanKeyInit(&key[0],
842  Anum_pg_depend_refclassid,
843  BTEqualStrategyNumber, F_OIDEQ,
844  ObjectIdGetDatum(object->classId));
845  ScanKeyInit(&key[1],
846  Anum_pg_depend_refobjid,
847  BTEqualStrategyNumber, F_OIDEQ,
848  ObjectIdGetDatum(object->objectId));
849  if (object->objectSubId != 0)
850  {
851  ScanKeyInit(&key[2],
852  Anum_pg_depend_refobjsubid,
853  BTEqualStrategyNumber, F_INT4EQ,
854  Int32GetDatum(object->objectSubId));
855  nkeys = 3;
856  }
857  else
858  nkeys = 2;
859 
860  scan = systable_beginscan(*depRel, DependReferenceIndexId, true,
861  NULL, nkeys, key);
862 
863  while (HeapTupleIsValid(tup = systable_getnext(scan)))
864  {
865  Form_pg_depend foundDep = (Form_pg_depend) GETSTRUCT(tup);
866  int subflags;
867 
868  otherObject.classId = foundDep->classid;
869  otherObject.objectId = foundDep->objid;
870  otherObject.objectSubId = foundDep->objsubid;
871 
872  /*
873  * If what we found is a sub-object of the current object, just ignore
874  * it. (Normally, such a dependency is implicit, but we must make
875  * explicit ones in some cases involving partitioning.)
876  */
877  if (otherObject.classId == object->classId &&
878  otherObject.objectId == object->objectId &&
879  object->objectSubId == 0)
880  continue;
881 
882  /*
883  * Must lock the dependent object before recursing to it.
884  */
885  AcquireDeletionLock(&otherObject, 0);
886 
887  /*
888  * The dependent object might have been deleted while we waited to
889  * lock it; if so, we don't need to do anything more with it. We can
890  * test this cheaply and independently of the object's type by seeing
891  * if the pg_depend tuple we are looking at is still live. (If the
892  * object got deleted, the tuple would have been deleted too.)
893  */
894  if (!systable_recheck_tuple(scan, tup))
895  {
896  /* release the now-useless lock */
897  ReleaseDeletionLock(&otherObject);
898  /* and continue scanning for dependencies */
899  continue;
900  }
901 
902  /*
903  * We do need to delete it, so identify objflags to be passed down,
904  * which depend on the dependency type.
905  */
906  switch (foundDep->deptype)
907  {
908  case DEPENDENCY_NORMAL:
909  subflags = DEPFLAG_NORMAL;
910  break;
911  case DEPENDENCY_AUTO:
913  subflags = DEPFLAG_AUTO;
914  break;
915  case DEPENDENCY_INTERNAL:
916  subflags = DEPFLAG_INTERNAL;
917  break;
920  subflags = DEPFLAG_PARTITION;
921  break;
923  subflags = DEPFLAG_EXTENSION;
924  break;
925  default:
926  elog(ERROR, "unrecognized dependency type '%c' for %s",
927  foundDep->deptype, getObjectDescription(object, false));
928  subflags = 0; /* keep compiler quiet */
929  break;
930  }
931 
932  /* And add it to the pending-objects list */
933  if (numDependentObjects >= maxDependentObjects)
934  {
935  /* enlarge array if needed */
936  maxDependentObjects *= 2;
937  dependentObjects = (ObjectAddressAndFlags *)
938  repalloc(dependentObjects,
939  maxDependentObjects * sizeof(ObjectAddressAndFlags));
940  }
941 
942  dependentObjects[numDependentObjects].obj = otherObject;
943  dependentObjects[numDependentObjects].subflags = subflags;
944  numDependentObjects++;
945  }
946 
947  systable_endscan(scan);
948 
949  /*
950  * Now we can sort the dependent objects into a stable visitation order.
951  * It's safe to use object_address_comparator here since the obj field is
952  * first within ObjectAddressAndFlags.
953  */
954  if (numDependentObjects > 1)
955  qsort((void *) dependentObjects, numDependentObjects,
956  sizeof(ObjectAddressAndFlags),
958 
959  /*
960  * Now recurse to the dependent objects. We must visit them first since
961  * they have to be deleted before the current object.
962  */
963  mystack.object = object; /* set up a new stack level */
964  mystack.flags = objflags;
965  mystack.next = stack;
966 
967  for (int i = 0; i < numDependentObjects; i++)
968  {
969  ObjectAddressAndFlags *depObj = dependentObjects + i;
970 
971  findDependentObjects(&depObj->obj,
972  depObj->subflags,
973  flags,
974  &mystack,
975  targetObjects,
976  pendingObjects,
977  depRel);
978  }
979 
980  pfree(dependentObjects);
981 
982  /*
983  * Finally, we can add the target object to targetObjects. Be careful to
984  * include any flags that were passed back down to us from inner recursion
985  * levels. Record the "dependee" as being either the most important
986  * partition owner if there is one, else the object we recursed from, if
987  * any. (The logic in reportDependentObjects() is such that it can only
988  * need one of those objects.)
989  */
990  extra.flags = mystack.flags;
991  if (extra.flags & DEPFLAG_IS_PART)
992  extra.dependee = partitionObject;
993  else if (stack)
994  extra.dependee = *stack->object;
995  else
996  memset(&extra.dependee, 0, sizeof(extra.dependee));
997  add_exact_object_address_extra(object, &extra, targetObjects);
998 }
static void findDependentObjects(const ObjectAddress *object, int objflags, int flags, ObjectAddressStack *stack, ObjectAddresses *targetObjects, const ObjectAddresses *pendingObjects, Relation *depRel)
Definition: dependency.c:472
Oid CurrentExtensionObject
Definition: extension.c:72
static int object_address_comparator(const void *a, const void *b)
Definition: dependency.c:2383
#define DEPFLAG_PARTITION
Definition: dependency.c:102
char * getObjectDescription(const ObjectAddress *object, bool missing_ok)
int errhint(const char *fmt,...)
Definition: elog.c:1156
void systable_endscan(SysScanDesc sysscan)
Definition: genam.c:595
#define GETSTRUCT(TUP)
Definition: htup_details.h:654
static void add_exact_object_address_extra(const ObjectAddress *object, const ObjectAddressExtra *extra, ObjectAddresses *addrs)
Definition: dependency.c:2507
bool object_address_present(const ObjectAddress *object, const ObjectAddresses *addrs)
Definition: dependency.c:2542
void ReleaseDeletionLock(const ObjectAddress *object)
Definition: dependency.c:1543
int errcode(int sqlerrcode)
Definition: elog.c:698
#define DEPFLAG_REVERSE
Definition: dependency.c:104
#define OidIsValid(objectId)
Definition: c.h:710
struct ObjectAddressStack * next
Definition: dependency.c:125
SysScanDesc systable_beginscan(Relation heapRelation, Oid indexId, bool indexOK, Snapshot snapshot, int nkeys, ScanKey key)
Definition: genam.c:383
bool systable_recheck_tuple(SysScanDesc sysscan, HeapTuple tup)
Definition: genam.c:561
ObjectAddress obj
Definition: dependency.c:131
HeapTuple systable_getnext(SysScanDesc sysscan)
Definition: genam.c:502
void pfree(void *pointer)
Definition: mcxt.c:1169
bool IsPinnedObject(Oid classId, Oid objectId)
Definition: catalog.c:307
#define ObjectIdGetDatum(X)
Definition: postgres.h:551
#define ERROR
Definition: elog.h:46
#define DEPFLAG_IS_PART
Definition: dependency.c:105
#define DEPFLAG_AUTO
Definition: dependency.c:100
const ObjectAddress * object
Definition: dependency.c:123
#define DEPFLAG_INTERNAL
Definition: dependency.c:101
static bool object_address_present_add_flags(const ObjectAddress *object, int flags, ObjectAddresses *addrs)
Definition: dependency.c:2568
FormData_pg_depend * Form_pg_depend
Definition: pg_depend.h:72
void AcquireDeletionLock(const ObjectAddress *object, int flags)
Definition: dependency.c:1514
bool creating_extension
Definition: extension.c:71
#define ereport(elevel,...)
Definition: elog.h:157
#define DEPFLAG_EXTENSION
Definition: dependency.c:103
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
void * repalloc(void *pointer, Size size)
Definition: mcxt.c:1182
#define Int32GetDatum(X)
Definition: postgres.h:523
void * palloc(Size size)
Definition: mcxt.c:1062
int errmsg(const char *fmt,...)
Definition: elog.c:909
#define DEPFLAG_NORMAL
Definition: dependency.c:99
#define elog(elevel,...)
Definition: elog.h:232
int i
void ScanKeyInit(ScanKey entry, AttrNumber attributeNumber, StrategyNumber strategy, RegProcedure procedure, Datum argument)
Definition: scankey.c:76
#define qsort(a, b, c, d)
Definition: port.h:504
static bool stack_address_present_add_flags(const ObjectAddress *object, int flags, ObjectAddressStack *stack)
Definition: dependency.c:2641
#define PERFORM_DELETION_SKIP_EXTENSIONS
Definition: dependency.h:137
ObjectAddress dependee
Definition: dependency.c:94
#define BTEqualStrategyNumber
Definition: stratnum.h:31

◆ free_object_addresses()

◆ getObjectClass()

ObjectClass getObjectClass ( const ObjectAddress object)

Definition at line 2737 of file dependency.c.

References ObjectAddress::classId, elog, ERROR, ObjectAddress::objectSubId, OCLASS_AM, OCLASS_AMOP, OCLASS_AMPROC, OCLASS_CAST, OCLASS_CLASS, OCLASS_COLLATION, OCLASS_CONSTRAINT, OCLASS_CONVERSION, OCLASS_DATABASE, OCLASS_DEFACL, OCLASS_DEFAULT, OCLASS_EVENT_TRIGGER, OCLASS_EXTENSION, OCLASS_FDW, OCLASS_FOREIGN_SERVER, OCLASS_LANGUAGE, OCLASS_LARGEOBJECT, OCLASS_OPCLASS, OCLASS_OPERATOR, OCLASS_OPFAMILY, OCLASS_POLICY, OCLASS_PROC, OCLASS_PUBLICATION, OCLASS_PUBLICATION_REL, OCLASS_REWRITE, OCLASS_ROLE, OCLASS_SCHEMA, OCLASS_STATISTIC_EXT, OCLASS_SUBSCRIPTION, OCLASS_TBLSPACE, OCLASS_TRANSFORM, OCLASS_TRIGGER, OCLASS_TSCONFIG, OCLASS_TSDICT, OCLASS_TSPARSER, OCLASS_TSTEMPLATE, OCLASS_TYPE, and OCLASS_USER_MAPPING.

Referenced by AlterObjectNamespace_oid(), ATExecAlterColumnType(), deleteObjectsInList(), doDeletion(), EventTriggerSQLDropAddObject(), getObjectDescription(), getObjectIdentityParts(), and getObjectTypeDescription().

2738 {
2739  /* only pg_class entries can have nonzero objectSubId */
2740  if (object->classId != RelationRelationId &&
2741  object->objectSubId != 0)
2742  elog(ERROR, "invalid non-zero objectSubId for object class %u",
2743  object->classId);
2744 
2745  switch (object->classId)
2746  {
2747  case RelationRelationId:
2748  /* caller must check objectSubId */
2749  return OCLASS_CLASS;
2750 
2751  case ProcedureRelationId:
2752  return OCLASS_PROC;
2753 
2754  case TypeRelationId:
2755  return OCLASS_TYPE;
2756 
2757  case CastRelationId:
2758  return OCLASS_CAST;
2759 
2760  case CollationRelationId:
2761  return OCLASS_COLLATION;
2762 
2763  case ConstraintRelationId:
2764  return OCLASS_CONSTRAINT;
2765 
2766  case ConversionRelationId:
2767  return OCLASS_CONVERSION;
2768 
2769  case AttrDefaultRelationId:
2770  return OCLASS_DEFAULT;
2771 
2772  case LanguageRelationId:
2773  return OCLASS_LANGUAGE;
2774 
2775  case LargeObjectRelationId:
2776  return OCLASS_LARGEOBJECT;
2777 
2778  case OperatorRelationId:
2779  return OCLASS_OPERATOR;
2780 
2781  case OperatorClassRelationId:
2782  return OCLASS_OPCLASS;
2783 
2784  case OperatorFamilyRelationId:
2785  return OCLASS_OPFAMILY;
2786 
2787  case AccessMethodRelationId:
2788  return OCLASS_AM;
2789 
2790  case AccessMethodOperatorRelationId:
2791  return OCLASS_AMOP;
2792 
2793  case AccessMethodProcedureRelationId:
2794  return OCLASS_AMPROC;
2795 
2796  case RewriteRelationId:
2797  return OCLASS_REWRITE;
2798 
2799  case TriggerRelationId:
2800  return OCLASS_TRIGGER;
2801 
2802  case NamespaceRelationId:
2803  return OCLASS_SCHEMA;
2804 
2805  case StatisticExtRelationId:
2806  return OCLASS_STATISTIC_EXT;
2807 
2808  case TSParserRelationId:
2809  return OCLASS_TSPARSER;
2810 
2811  case TSDictionaryRelationId:
2812  return OCLASS_TSDICT;
2813 
2814  case TSTemplateRelationId:
2815  return OCLASS_TSTEMPLATE;
2816 
2817  case TSConfigRelationId:
2818  return OCLASS_TSCONFIG;
2819 
2820  case AuthIdRelationId:
2821  return OCLASS_ROLE;
2822 
2823  case DatabaseRelationId:
2824  return OCLASS_DATABASE;
2825 
2826  case TableSpaceRelationId:
2827  return OCLASS_TBLSPACE;
2828 
2829  case ForeignDataWrapperRelationId:
2830  return OCLASS_FDW;
2831 
2832  case ForeignServerRelationId:
2833  return OCLASS_FOREIGN_SERVER;
2834 
2835  case UserMappingRelationId:
2836  return OCLASS_USER_MAPPING;
2837 
2838  case DefaultAclRelationId:
2839  return OCLASS_DEFACL;
2840 
2841  case ExtensionRelationId:
2842  return OCLASS_EXTENSION;
2843 
2844  case EventTriggerRelationId:
2845  return OCLASS_EVENT_TRIGGER;
2846 
2847  case PolicyRelationId:
2848  return OCLASS_POLICY;
2849 
2850  case PublicationRelationId:
2851  return OCLASS_PUBLICATION;
2852 
2853  case PublicationRelRelationId:
2854  return OCLASS_PUBLICATION_REL;
2855 
2856  case SubscriptionRelationId:
2857  return OCLASS_SUBSCRIPTION;
2858 
2859  case TransformRelationId:
2860  return OCLASS_TRANSFORM;
2861  }
2862 
2863  /* shouldn't get here */
2864  elog(ERROR, "unrecognized object class: %u", object->classId);
2865  return OCLASS_CLASS; /* keep compiler quiet */
2866 }
#define ERROR
Definition: elog.h:46
#define elog(elevel,...)
Definition: elog.h:232

◆ new_object_addresses()

ObjectAddresses* new_object_addresses ( void  )

Definition at line 2427 of file dependency.c.

References ObjectAddresses::extras, ObjectAddresses::maxrefs, ObjectAddresses::numrefs, palloc(), and ObjectAddresses::refs.

Referenced by AggregateCreate(), AlterExtensionNamespace(), AlterTableNamespace(), AlterTypeNamespace(), ATExecDropColumn(), ATPostAlterTypeCleanup(), CastCreate(), CreateConstraintEntry(), CreateProceduralLanguage(), CreateTransform(), DropClonedTriggersFromPartition(), GenerateTypeDependencies(), heap_create_with_catalog(), index_create(), InsertExtensionTuple(), makeConfigurationDependencies(), makeDictionaryDependencies(), makeOperatorDependencies(), makeParserDependencies(), makeTSTemplateDependencies(), performDeletion(), performMultipleDeletions(), PreCommit_on_commit_actions(), ProcedureCreate(), RangeCreate(), recordDependencyOnExpr(), recordDependencyOnSingleRelExpr(), ReindexRelationConcurrently(), RemoveObjects(), RemoveRelations(), shdepDropOwned(), and StorePartitionKey().

2428 {
2429  ObjectAddresses *addrs;
2430 
2431  addrs = palloc(sizeof(ObjectAddresses));
2432 
2433  addrs->numrefs = 0;
2434  addrs->maxrefs = 32;
2435  addrs->refs = (ObjectAddress *)
2436  palloc(addrs->maxrefs * sizeof(ObjectAddress));
2437  addrs->extras = NULL; /* until/unless needed */
2438 
2439  return addrs;
2440 }
ObjectAddress * refs
Definition: dependency.c:112
ObjectAddressExtra * extras
Definition: dependency.c:113
void * palloc(Size size)
Definition: mcxt.c:1062

◆ object_address_comparator()

static int object_address_comparator ( const void *  a,
const void *  b 
)
static

Definition at line 2383 of file dependency.c.

References ObjectAddress::classId, ObjectAddress::objectId, and ObjectAddress::objectSubId.

Referenced by eliminate_duplicate_dependencies(), findDependentObjects(), and sort_object_addresses().

2384 {
2385  const ObjectAddress *obja = (const ObjectAddress *) a;
2386  const ObjectAddress *objb = (const ObjectAddress *) b;
2387 
2388  /*
2389  * Primary sort key is OID descending. Most of the time, this will result
2390  * in putting newer objects before older ones, which is likely to be the
2391  * right order to delete in.
2392  */
2393  if (obja->objectId > objb->objectId)
2394  return -1;
2395  if (obja->objectId < objb->objectId)
2396  return 1;
2397 
2398  /*
2399  * Next sort on catalog ID, in case identical OIDs appear in different
2400  * catalogs. Sort direction is pretty arbitrary here.
2401  */
2402  if (obja->classId < objb->classId)
2403  return -1;
2404  if (obja->classId > objb->classId)
2405  return 1;
2406 
2407  /*
2408  * Last, sort on object subId.
2409  *
2410  * We sort the subId as an unsigned int so that 0 (the whole object) will
2411  * come first. This is essential for eliminate_duplicate_dependencies,
2412  * and is also the best order for findDependentObjects.
2413  */
2414  if ((unsigned int) obja->objectSubId < (unsigned int) objb->objectSubId)
2415  return -1;
2416  if ((unsigned int) obja->objectSubId > (unsigned int) objb->objectSubId)
2417  return 1;
2418  return 0;
2419 }

◆ object_address_present()

bool object_address_present ( const ObjectAddress object,
const ObjectAddresses addrs 
)

Definition at line 2542 of file dependency.c.

References ObjectAddress::classId, i, ObjectAddresses::numrefs, ObjectAddress::objectId, ObjectAddress::objectSubId, and ObjectAddresses::refs.

Referenced by AlterConstraintNamespaces(), AlterIndexNamespaces(), AlterRelationNamespaceInternal(), AlterTypeNamespaceInternal(), findDependentObjects(), and PreCommit_on_commit_actions().

2544 {
2545  int i;
2546 
2547  for (i = addrs->numrefs - 1; i >= 0; i--)
2548  {
2549  const ObjectAddress *thisobj = addrs->refs + i;
2550 
2551  if (object->classId == thisobj->classId &&
2552  object->objectId == thisobj->objectId)
2553  {
2554  if (object->objectSubId == thisobj->objectSubId ||
2555  thisobj->objectSubId == 0)
2556  return true;
2557  }
2558  }
2559 
2560  return false;
2561 }
ObjectAddress * refs
Definition: dependency.c:112
int i

◆ object_address_present_add_flags()

static bool object_address_present_add_flags ( const ObjectAddress object,
int  flags,
ObjectAddresses addrs 
)
static

Definition at line 2568 of file dependency.c.

References ObjectAddress::classId, DEPFLAG_SUBOBJECT, ObjectAddresses::extras, ObjectAddressExtra::flags, ObjectAddressStack::flags, i, ObjectAddresses::numrefs, ObjectAddress::objectId, ObjectAddress::objectSubId, and ObjectAddresses::refs.

Referenced by findDependentObjects().

2571 {
2572  bool result = false;
2573  int i;
2574 
2575  for (i = addrs->numrefs - 1; i >= 0; i--)
2576  {
2577  ObjectAddress *thisobj = addrs->refs + i;
2578 
2579  if (object->classId == thisobj->classId &&
2580  object->objectId == thisobj->objectId)
2581  {
2582  if (object->objectSubId == thisobj->objectSubId)
2583  {
2584  ObjectAddressExtra *thisextra = addrs->extras + i;
2585 
2586  thisextra->flags |= flags;
2587  result = true;
2588  }
2589  else if (thisobj->objectSubId == 0)
2590  {
2591  /*
2592  * We get here if we find a need to delete a column after
2593  * having already decided to drop its whole table. Obviously
2594  * we no longer need to drop the subobject, so report that we
2595  * found the subobject in the array. But don't plaster its
2596  * flags on the whole object.
2597  */
2598  result = true;
2599  }
2600  else if (object->objectSubId == 0)
2601  {
2602  /*
2603  * We get here if we find a need to delete a whole table after
2604  * having already decided to drop one of its columns. We
2605  * can't report that the whole object is in the array, but we
2606  * should mark the subobject with the whole object's flags.
2607  *
2608  * It might seem attractive to physically delete the column's
2609  * array entry, or at least mark it as no longer needing
2610  * separate deletion. But that could lead to, e.g., dropping
2611  * the column's datatype before we drop the table, which does
2612  * not seem like a good idea. This is a very rare situation
2613  * in practice, so we just take the hit of doing a separate
2614  * DROP COLUMN action even though we know we're gonna delete
2615  * the table later.
2616  *
2617  * What we can do, though, is mark this as a subobject so that
2618  * we don't report it separately, which is confusing because
2619  * it's unpredictable whether it happens or not. But do so
2620  * only if flags != 0 (flags == 0 is a read-only probe).
2621  *
2622  * Because there could be other subobjects of this object in
2623  * the array, this case means we always have to loop through
2624  * the whole array; we cannot exit early on a match.
2625  */
2626  ObjectAddressExtra *thisextra = addrs->extras + i;
2627 
2628  if (flags)
2629  thisextra->flags |= (flags | DEPFLAG_SUBOBJECT);
2630  }
2631  }
2632  }
2633 
2634  return result;
2635 }
#define DEPFLAG_SUBOBJECT
Definition: dependency.c:106
ObjectAddress * refs
Definition: dependency.c:112
ObjectAddressExtra * extras
Definition: dependency.c:113
int i

◆ performDeletion()

void performDeletion ( const ObjectAddress object,
DropBehavior  behavior,
int  flags 
)

Definition at line 313 of file dependency.c.

References AcquireDeletionLock(), deleteObjectsInList(), DEPFLAG_ORIGINAL, findDependentObjects(), free_object_addresses(), new_object_addresses(), reportDependentObjects(), RowExclusiveLock, table_close(), and table_open().

Referenced by AlterDomainDropConstraint(), ATExecDropConstraint(), ATExecDropIdentity(), DefineQueryRewrite(), DetachPartitionFinalize(), do_autovacuum(), dropOperators(), dropProcedures(), finish_heap_swap(), inv_drop(), PublicationDropTables(), RemoveAttrDefault(), RemoveTempRelations(), RemoveUserMapping(), SetDefaultACL(), and tryAttachPartitionForeignKey().

315 {
316  Relation depRel;
317  ObjectAddresses *targetObjects;
318 
319  /*
320  * We save some cycles by opening pg_depend just once and passing the
321  * Relation pointer down to all the recursive deletion steps.
322  */
323  depRel = table_open(DependRelationId, RowExclusiveLock);
324 
325  /*
326  * Acquire deletion lock on the target object. (Ideally the caller has
327  * done this already, but many places are sloppy about it.)
328  */
329  AcquireDeletionLock(object, 0);
330 
331  /*
332  * Construct a list of objects to delete (ie, the given object plus
333  * everything directly or indirectly dependent on it).
334  */
335  targetObjects = new_object_addresses();
336 
337  findDependentObjects(object,
339  flags,
340  NULL, /* empty stack */
341  targetObjects,
342  NULL, /* no pendingObjects */
343  &depRel);
344 
345  /*
346  * Check if deletion is allowed, and report about cascaded deletes.
347  */
348  reportDependentObjects(targetObjects,
349  behavior,
350  flags,
351  object);
352 
353  /* do the deed */
354  deleteObjectsInList(targetObjects, &depRel, flags);
355 
356  /* And clean up */
357  free_object_addresses(targetObjects);
358 
359  table_close(depRel, RowExclusiveLock);
360 }
static void findDependentObjects(const ObjectAddress *object, int objflags, int flags, ObjectAddressStack *stack, ObjectAddresses *targetObjects, const ObjectAddresses *pendingObjects, Relation *depRel)
Definition: dependency.c:472
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:167
ObjectAddresses * new_object_addresses(void)
Definition: dependency.c:2427
void free_object_addresses(ObjectAddresses *addrs)
Definition: dependency.c:2722
#define DEPFLAG_ORIGINAL
Definition: dependency.c:98
#define RowExclusiveLock
Definition: lockdefs.h:38
static void reportDependentObjects(const ObjectAddresses *targetObjects, DropBehavior behavior, int flags, const ObjectAddress *origObject)
Definition: dependency.c:1014
void AcquireDeletionLock(const ObjectAddress *object, int flags)
Definition: dependency.c:1514
static void deleteObjectsInList(ObjectAddresses *targetObjects, Relation *depRel, int flags)
Definition: dependency.c:225
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:39

◆ performMultipleDeletions()

void performMultipleDeletions ( const ObjectAddresses objects,
DropBehavior  behavior,
int  flags 
)

Definition at line 372 of file dependency.c.

References AcquireDeletionLock(), deleteObjectsInList(), DEPFLAG_ORIGINAL, findDependentObjects(), free_object_addresses(), i, new_object_addresses(), ObjectAddresses::numrefs, ObjectAddresses::refs, reportDependentObjects(), RowExclusiveLock, table_close(), and table_open().

Referenced by ATExecDropColumn(), ATPostAlterTypeCleanup(), DropClonedTriggersFromPartition(), PreCommit_on_commit_actions(), ReindexRelationConcurrently(), RemoveObjects(), RemoveRelations(), and shdepDropOwned().

374 {
375  Relation depRel;
376  ObjectAddresses *targetObjects;
377  int i;
378 
379  /* No work if no objects... */
380  if (objects->numrefs <= 0)
381  return;
382 
383  /*
384  * We save some cycles by opening pg_depend just once and passing the
385  * Relation pointer down to all the recursive deletion steps.
386  */
387  depRel = table_open(DependRelationId, RowExclusiveLock);
388 
389  /*
390  * Construct a list of objects to delete (ie, the given objects plus
391  * everything directly or indirectly dependent on them). Note that
392  * because we pass the whole objects list as pendingObjects context, we
393  * won't get a failure from trying to delete an object that is internally
394  * dependent on another one in the list; we'll just skip that object and
395  * delete it when we reach its owner.
396  */
397  targetObjects = new_object_addresses();
398 
399  for (i = 0; i < objects->numrefs; i++)
400  {
401  const ObjectAddress *thisobj = objects->refs + i;
402 
403  /*
404  * Acquire deletion lock on each target object. (Ideally the caller
405  * has done this already, but many places are sloppy about it.)
406  */
407  AcquireDeletionLock(thisobj, flags);
408 
409  findDependentObjects(thisobj,
411  flags,
412  NULL, /* empty stack */
413  targetObjects,
414  objects,
415  &depRel);
416  }
417 
418  /*
419  * Check if deletion is allowed, and report about cascaded deletes.
420  *
421  * If there's exactly one object being deleted, report it the same way as
422  * in performDeletion(), else we have to be vaguer.
423  */
424  reportDependentObjects(targetObjects,
425  behavior,
426  flags,
427  (objects->numrefs == 1 ? objects->refs : NULL));
428 
429  /* do the deed */
430  deleteObjectsInList(targetObjects, &depRel, flags);
431 
432  /* And clean up */
433  free_object_addresses(targetObjects);
434 
435  table_close(depRel, RowExclusiveLock);
436 }
static void findDependentObjects(const ObjectAddress *object, int objflags, int flags, ObjectAddressStack *stack, ObjectAddresses *targetObjects, const ObjectAddresses *pendingObjects, Relation *depRel)
Definition: dependency.c:472
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:167
ObjectAddresses * new_object_addresses(void)
Definition: dependency.c:2427
void free_object_addresses(ObjectAddresses *addrs)
Definition: dependency.c:2722
#define DEPFLAG_ORIGINAL
Definition: dependency.c:98
ObjectAddress * refs
Definition: dependency.c:112
#define RowExclusiveLock
Definition: lockdefs.h:38
static void reportDependentObjects(const ObjectAddresses *targetObjects, DropBehavior behavior, int flags, const ObjectAddress *origObject)
Definition: dependency.c:1014
void AcquireDeletionLock(const ObjectAddress *object, int flags)
Definition: dependency.c:1514
int i
static void deleteObjectsInList(ObjectAddresses *targetObjects, Relation *depRel, int flags)
Definition: dependency.c:225
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:39

◆ record_object_address_dependencies()

void record_object_address_dependencies ( const ObjectAddress depender,
ObjectAddresses referenced,
DependencyType  behavior 
)

Definition at line 2691 of file dependency.c.

References eliminate_duplicate_dependencies(), ObjectAddresses::numrefs, recordMultipleDependencies(), and ObjectAddresses::refs.

Referenced by AggregateCreate(), CastCreate(), CreateConstraintEntry(), CreateProceduralLanguage(), CreateTransform(), GenerateTypeDependencies(), heap_create_with_catalog(), index_create(), InsertExtensionTuple(), makeConfigurationDependencies(), makeDictionaryDependencies(), makeOperatorDependencies(), makeParserDependencies(), makeTSTemplateDependencies(), ProcedureCreate(), RangeCreate(), and StorePartitionKey().

2694 {
2696  recordMultipleDependencies(depender,
2697  referenced->refs, referenced->numrefs,
2698  behavior);
2699 }
static void eliminate_duplicate_dependencies(ObjectAddresses *addrs)
Definition: dependency.c:2323
ObjectAddress * refs
Definition: dependency.c:112
void recordMultipleDependencies(const ObjectAddress *depender, const ObjectAddress *referenced, int nreferenced, DependencyType behavior)
Definition: pg_depend.c:56

◆ recordDependencyOnExpr()

void recordDependencyOnExpr ( const ObjectAddress depender,
Node expr,
List rtable,
DependencyType  behavior 
)

Definition at line 1568 of file dependency.c.

References find_expr_references_context::addrs, eliminate_duplicate_dependencies(), find_expr_references_walker(), free_object_addresses(), list_make1, new_object_addresses(), ObjectAddresses::numrefs, recordMultipleDependencies(), ObjectAddresses::refs, and find_expr_references_context::rtables.

Referenced by AlterPolicy(), CreatePolicy(), CreateTriggerFiringOn(), GenerateTypeDependencies(), InsertRule(), and ProcedureCreate().

1571 {
1573 
1574  context.addrs = new_object_addresses();
1575 
1576  /* Set up interpretation for Vars at varlevelsup = 0 */
1577  context.rtables = list_make1(rtable);
1578 
1579  /* Scan the expression tree for referenceable objects */
1580  find_expr_references_walker(expr, &context);
1581 
1582  /* Remove any duplicates */
1584 
1585  /* And record 'em */
1586  recordMultipleDependencies(depender,
1587  context.addrs->refs, context.addrs->numrefs,
1588  behavior);
1589 
1590  free_object_addresses(context.addrs);
1591 }
static bool find_expr_references_walker(Node *node, find_expr_references_context *context)
Definition: dependency.c:1714
ObjectAddresses * addrs
Definition: dependency.c:138
ObjectAddresses * new_object_addresses(void)
Definition: dependency.c:2427
void free_object_addresses(ObjectAddresses *addrs)
Definition: dependency.c:2722
static void eliminate_duplicate_dependencies(ObjectAddresses *addrs)
Definition: dependency.c:2323
#define list_make1(x1)
Definition: pg_list.h:206
ObjectAddress * refs
Definition: dependency.c:112
void recordMultipleDependencies(const ObjectAddress *depender, const ObjectAddress *referenced, int nreferenced, DependencyType behavior)
Definition: pg_depend.c:56

◆ recordDependencyOnSingleRelExpr()

void recordDependencyOnSingleRelExpr ( const ObjectAddress depender,
Node expr,
Oid  relId,
DependencyType  behavior,
DependencyType  self_behavior,
bool  reverse_self 
)

Definition at line 1611 of file dependency.c.

References AccessShareLock, add_exact_object_address(), find_expr_references_context::addrs, ObjectAddress::classId, eliminate_duplicate_dependencies(), find_expr_references_walker(), free_object_addresses(), list_make1, MemSet, new_object_addresses(), ObjectAddresses::numrefs, ObjectAddress::objectId, recordDependencyOn(), recordMultipleDependencies(), ObjectAddresses::refs, RangeTblEntry::relid, RangeTblEntry::relkind, RangeTblEntry::rellockmode, find_expr_references_context::rtables, RTE_RELATION, RangeTblEntry::rtekind, T_RangeTblEntry, and RangeTblEntry::type.

Referenced by CreateConstraintEntry(), CreateStatistics(), index_create(), StoreAttrDefault(), and StorePartitionKey().

1616 {
1618  RangeTblEntry rte;
1619 
1620  context.addrs = new_object_addresses();
1621 
1622  /* We gin up a rather bogus rangetable list to handle Vars */
1623  MemSet(&rte, 0, sizeof(rte));
1624  rte.type = T_RangeTblEntry;
1625  rte.rtekind = RTE_RELATION;
1626  rte.relid = relId;
1627  rte.relkind = RELKIND_RELATION; /* no need for exactness here */
1629 
1630  context.rtables = list_make1(list_make1(&rte));
1631 
1632  /* Scan the expression tree for referenceable objects */
1633  find_expr_references_walker(expr, &context);
1634 
1635  /* Remove any duplicates */
1637 
1638  /* Separate self-dependencies if necessary */
1639  if ((behavior != self_behavior || reverse_self) &&
1640  context.addrs->numrefs > 0)
1641  {
1642  ObjectAddresses *self_addrs;
1643  ObjectAddress *outobj;
1644  int oldref,
1645  outrefs;
1646 
1647  self_addrs = new_object_addresses();
1648 
1649  outobj = context.addrs->refs;
1650  outrefs = 0;
1651  for (oldref = 0; oldref < context.addrs->numrefs; oldref++)
1652  {
1653  ObjectAddress *thisobj = context.addrs->refs + oldref;
1654 
1655  if (thisobj->classId == RelationRelationId &&
1656  thisobj->objectId == relId)
1657  {
1658  /* Move this ref into self_addrs */
1659  add_exact_object_address(thisobj, self_addrs);
1660  }
1661  else
1662  {
1663  /* Keep it in context.addrs */
1664  *outobj = *thisobj;
1665  outobj++;
1666  outrefs++;
1667  }
1668  }
1669  context.addrs->numrefs = outrefs;
1670 
1671  /* Record the self-dependencies with the appropriate direction */
1672  if (!reverse_self)
1673  recordMultipleDependencies(depender,
1674  self_addrs->refs, self_addrs->numrefs,
1675  self_behavior);
1676  else
1677  {
1678  /* Can't use recordMultipleDependencies, so do it the hard way */
1679  int selfref;
1680 
1681  for (selfref = 0; selfref < self_addrs->numrefs; selfref++)
1682  {
1683  ObjectAddress *thisobj = self_addrs->refs + selfref;
1684 
1685  recordDependencyOn(thisobj, depender, self_behavior);
1686  }
1687  }
1688 
1689  free_object_addresses(self_addrs);
1690  }
1691 
1692  /* Record the external dependencies */
1693  recordMultipleDependencies(depender,
1694  context.addrs->refs, context.addrs->numrefs,
1695  behavior);
1696 
1697  free_object_addresses(context.addrs);
1698 }
static bool find_expr_references_walker(Node *node, find_expr_references_context *context)
Definition: dependency.c:1714
ObjectAddresses * addrs
Definition: dependency.c:138
#define AccessShareLock
Definition: lockdefs.h:36
#define MemSet(start, val, len)
Definition: c.h:1008
void recordDependencyOn(const ObjectAddress *depender, const ObjectAddress *referenced, DependencyType behavior)
Definition: pg_depend.c:44
void add_exact_object_address(const ObjectAddress *object, ObjectAddresses *addrs)
Definition: dependency.c:2482
ObjectAddresses * new_object_addresses(void)
Definition: dependency.c:2427
void free_object_addresses(ObjectAddresses *addrs)
Definition: dependency.c:2722
static void eliminate_duplicate_dependencies(ObjectAddresses *addrs)
Definition: dependency.c:2323
#define list_make1(x1)
Definition: pg_list.h:206
ObjectAddress * refs
Definition: dependency.c:112
void recordMultipleDependencies(const ObjectAddress *depender, const ObjectAddress *referenced, int nreferenced, DependencyType behavior)
Definition: pg_depend.c:56
RTEKind rtekind
Definition: parsenodes.h:995
NodeTag type
Definition: parsenodes.h:993

◆ ReleaseDeletionLock()

void ReleaseDeletionLock ( const ObjectAddress object)

Definition at line 1543 of file dependency.c.

References AccessExclusiveLock, ObjectAddress::classId, ObjectAddress::objectId, UnlockDatabaseObject(), and UnlockRelationOid().

Referenced by findDependentObjects(), and shdepDropOwned().

1544 {
1545  if (object->classId == RelationRelationId)
1547  else
1548  /* assume we should lock the whole object not a sub-object */
1549  UnlockDatabaseObject(object->classId, object->objectId, 0,
1551 }
void UnlockRelationOid(Oid relid, LOCKMODE lockmode)
Definition: lmgr.c:200
void UnlockDatabaseObject(Oid classid, Oid objid, uint16 objsubid, LOCKMODE lockmode)
Definition: lmgr.c:997
#define AccessExclusiveLock
Definition: lockdefs.h:45

◆ reportDependentObjects()

static void reportDependentObjects ( const ObjectAddresses targetObjects,
DropBehavior  behavior,
int  flags,
const ObjectAddress origObject 
)
static

Definition at line 1014 of file dependency.c.

References _, appendStringInfo(), appendStringInfoChar(), StringInfoData::data, DEBUG2, ObjectAddressExtra::dependee, DEPFLAG_AUTO, DEPFLAG_EXTENSION, DEPFLAG_INTERNAL, DEPFLAG_IS_PART, DEPFLAG_ORIGINAL, DEPFLAG_PARTITION, DEPFLAG_SUBOBJECT, DROP_CASCADE, DROP_RESTRICT, ereport, errcode(), errdetail(), errdetail_log(), errhint(), errmsg(), errmsg_internal(), errmsg_plural(), ERROR, ObjectAddresses::extras, ObjectAddressExtra::flags, getObjectDescription(), i, initStringInfo(), StringInfoData::len, MAX_REPORTED_DEPS, message_level_is_interesting(), ngettext, NOTICE, ObjectAddresses::numrefs, PERFORM_DELETION_QUIETLY, pfree(), and ObjectAddresses::refs.

Referenced by performDeletion(), and performMultipleDeletions().

1018 {
1019  int msglevel = (flags & PERFORM_DELETION_QUIETLY) ? DEBUG2 : NOTICE;
1020  bool ok = true;
1021  StringInfoData clientdetail;
1022  StringInfoData logdetail;
1023  int numReportedClient = 0;
1024  int numNotReportedClient = 0;
1025  int i;
1026 
1027  /*
1028  * If we need to delete any partition-dependent objects, make sure that
1029  * we're deleting at least one of their partition dependencies, too. That
1030  * can be detected by checking that we reached them by a PARTITION
1031  * dependency at some point.
1032  *
1033  * We just report the first such object, as in most cases the only way to
1034  * trigger this complaint is to explicitly try to delete one partition of
1035  * a partitioned object.
1036  */
1037  for (i = 0; i < targetObjects->numrefs; i++)
1038  {
1039  const ObjectAddressExtra *extra = &targetObjects->extras[i];
1040 
1041  if ((extra->flags & DEPFLAG_IS_PART) &&
1042  !(extra->flags & DEPFLAG_PARTITION))
1043  {
1044  const ObjectAddress *object = &targetObjects->refs[i];
1045  char *otherObjDesc = getObjectDescription(&extra->dependee,
1046  false);
1047 
1048  ereport(ERROR,
1049  (errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
1050  errmsg("cannot drop %s because %s requires it",
1051  getObjectDescription(object, false), otherObjDesc),
1052  errhint("You can drop %s instead.", otherObjDesc)));
1053  }
1054  }
1055 
1056  /*
1057  * If no error is to be thrown, and the msglevel is too low to be shown to
1058  * either client or server log, there's no need to do any of the rest of
1059  * the work.
1060  */
1061  if (behavior == DROP_CASCADE &&
1062  !message_level_is_interesting(msglevel))
1063  return;
1064 
1065  /*
1066  * We limit the number of dependencies reported to the client to
1067  * MAX_REPORTED_DEPS, since client software may not deal well with
1068  * enormous error strings. The server log always gets a full report.
1069  */
1070 #define MAX_REPORTED_DEPS 100
1071 
1072  initStringInfo(&clientdetail);
1073  initStringInfo(&logdetail);
1074 
1075  /*
1076  * We process the list back to front (ie, in dependency order not deletion
1077  * order), since this makes for a more understandable display.
1078  */
1079  for (i = targetObjects->numrefs - 1; i >= 0; i--)
1080  {
1081  const ObjectAddress *obj = &targetObjects->refs[i];
1082  const ObjectAddressExtra *extra = &targetObjects->extras[i];
1083  char *objDesc;
1084 
1085  /* Ignore the original deletion target(s) */
1086  if (extra->flags & DEPFLAG_ORIGINAL)
1087  continue;
1088 
1089  /* Also ignore sub-objects; we'll report the whole object elsewhere */
1090  if (extra->flags & DEPFLAG_SUBOBJECT)
1091  continue;
1092 
1093  objDesc = getObjectDescription(obj, false);
1094 
1095  /*
1096  * If, at any stage of the recursive search, we reached the object via
1097  * an AUTO, INTERNAL, PARTITION, or EXTENSION dependency, then it's
1098  * okay to delete it even in RESTRICT mode.
1099  */
1100  if (extra->flags & (DEPFLAG_AUTO |
1104  {
1105  /*
1106  * auto-cascades are reported at DEBUG2, not msglevel. We don't
1107  * try to combine them with the regular message because the
1108  * results are too confusing when client_min_messages and
1109  * log_min_messages are different.
1110  */
1111  ereport(DEBUG2,
1112  (errmsg_internal("drop auto-cascades to %s",
1113  objDesc)));
1114  }
1115  else if (behavior == DROP_RESTRICT)
1116  {
1117  char *otherDesc = getObjectDescription(&extra->dependee,
1118  false);
1119 
1120  if (numReportedClient < MAX_REPORTED_DEPS)
1121  {
1122  /* separate entries with a newline */
1123  if (clientdetail.len != 0)
1124  appendStringInfoChar(&clientdetail, '\n');
1125  appendStringInfo(&clientdetail, _("%s depends on %s"),
1126  objDesc, otherDesc);
1127  numReportedClient++;
1128  }
1129  else
1130  numNotReportedClient++;
1131  /* separate entries with a newline */
1132  if (logdetail.len != 0)
1133  appendStringInfoChar(&logdetail, '\n');
1134  appendStringInfo(&logdetail, _("%s depends on %s"),
1135  objDesc, otherDesc);
1136  pfree(otherDesc);
1137  ok = false;
1138  }
1139  else
1140  {
1141  if (numReportedClient < MAX_REPORTED_DEPS)
1142  {
1143  /* separate entries with a newline */
1144  if (clientdetail.len != 0)
1145  appendStringInfoChar(&clientdetail, '\n');
1146  appendStringInfo(&clientdetail, _("drop cascades to %s"),
1147  objDesc);
1148  numReportedClient++;
1149  }
1150  else
1151  numNotReportedClient++;
1152  /* separate entries with a newline */
1153  if (logdetail.len != 0)
1154  appendStringInfoChar(&logdetail, '\n');
1155  appendStringInfo(&logdetail, _("drop cascades to %s"),
1156  objDesc);
1157  }
1158 
1159  pfree(objDesc);
1160  }
1161 
1162  if (numNotReportedClient > 0)
1163  appendStringInfo(&clientdetail, ngettext("\nand %d other object "
1164  "(see server log for list)",
1165  "\nand %d other objects "
1166  "(see server log for list)",
1167  numNotReportedClient),
1168  numNotReportedClient);
1169 
1170  if (!ok)
1171  {
1172  if (origObject)
1173  ereport(ERROR,
1174  (errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
1175  errmsg("cannot drop %s because other objects depend on it",
1176  getObjectDescription(origObject, false)),
1177  errdetail("%s", clientdetail.data),
1178  errdetail_log("%s", logdetail.data),
1179  errhint("Use DROP ... CASCADE to drop the dependent objects too.")));
1180  else
1181  ereport(ERROR,
1182  (errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
1183  errmsg("cannot drop desired object(s) because other objects depend on them"),
1184  errdetail("%s", clientdetail.data),
1185  errdetail_log("%s", logdetail.data),
1186  errhint("Use DROP ... CASCADE to drop the dependent objects too.")));
1187  }
1188  else if (numReportedClient > 1)
1189  {
1190  ereport(msglevel,
1191  /* translator: %d always has a value larger than 1 */
1192  (errmsg_plural("drop cascades to %d other object",
1193  "drop cascades to %d other objects",
1194  numReportedClient + numNotReportedClient,
1195  numReportedClient + numNotReportedClient),
1196  errdetail("%s", clientdetail.data),
1197  errdetail_log("%s", logdetail.data)));
1198  }
1199  else if (numReportedClient == 1)
1200  {
1201  /* we just use the single item as-is */
1202  ereport(msglevel,
1203  (errmsg_internal("%s", clientdetail.data)));
1204  }
1205 
1206  pfree(clientdetail.data);
1207  pfree(logdetail.data);
1208 }
#define DEPFLAG_SUBOBJECT
Definition: dependency.c:106
#define DEPFLAG_PARTITION
Definition: dependency.c:102
char * getObjectDescription(const ObjectAddress *object, bool missing_ok)
int errhint(const char *fmt,...)
Definition: elog.c:1156
int errmsg_plural(const char *fmt_singular, const char *fmt_plural, unsigned long n,...)
Definition: elog.c:1019
int errcode(int sqlerrcode)
Definition: elog.c:698
void pfree(void *pointer)
Definition: mcxt.c:1169
void appendStringInfo(StringInfo str, const char *fmt,...)
Definition: stringinfo.c:91
#define ERROR
Definition: elog.h:46
#define DEPFLAG_ORIGINAL
Definition: dependency.c:98
#define DEPFLAG_IS_PART
Definition: dependency.c:105
#define DEPFLAG_AUTO
Definition: dependency.c:100
#define DEPFLAG_INTERNAL
Definition: dependency.c:101
#define DEBUG2
Definition: elog.h:24
bool message_level_is_interesting(int elevel)
Definition: elog.c:270
ObjectAddress * refs
Definition: dependency.c:112
int errdetail(const char *fmt,...)
Definition: elog.c:1042
int errdetail_log(const char *fmt,...)
Definition: elog.c:1090
void appendStringInfoChar(StringInfo str, char ch)
Definition: stringinfo.c:188
void initStringInfo(StringInfo str)
Definition: stringinfo.c:59
#define ngettext(s, p, n)
Definition: c.h:1182
#define ereport(elevel,...)
Definition: elog.h:157
#define DEPFLAG_EXTENSION
Definition: dependency.c:103
#define NOTICE
Definition: elog.h:37
int errmsg_internal(const char *fmt,...)
Definition: elog.c:996
#define PERFORM_DELETION_QUIETLY
Definition: dependency.h:135
ObjectAddressExtra * extras
Definition: dependency.c:113
int errmsg(const char *fmt,...)
Definition: elog.c:909
int i
#define MAX_REPORTED_DEPS
ObjectAddress dependee
Definition: dependency.c:94
#define _(x)
Definition: elog.c:89

◆ sort_object_addresses()

void sort_object_addresses ( ObjectAddresses addrs)

Definition at line 2710 of file dependency.c.

References ObjectAddresses::numrefs, object_address_comparator(), qsort, and ObjectAddresses::refs.

Referenced by shdepDropOwned().

2711 {
2712  if (addrs->numrefs > 1)
2713  qsort((void *) addrs->refs, addrs->numrefs,
2714  sizeof(ObjectAddress),
2716 }
static int object_address_comparator(const void *a, const void *b)
Definition: dependency.c:2383
ObjectAddress * refs
Definition: dependency.c:112
#define qsort(a, b, c, d)
Definition: port.h:504

◆ stack_address_present_add_flags()

static bool stack_address_present_add_flags ( const ObjectAddress object,
int  flags,
ObjectAddressStack stack 
)
static

Definition at line 2641 of file dependency.c.

References ObjectAddress::classId, DEPFLAG_SUBOBJECT, ObjectAddressStack::flags, ObjectAddressStack::next, ObjectAddressStack::object, ObjectAddress::objectId, and ObjectAddress::objectSubId.

Referenced by findDependentObjects().

2644 {
2645  bool result = false;
2646  ObjectAddressStack *stackptr;
2647 
2648  for (stackptr = stack; stackptr; stackptr = stackptr->next)
2649  {
2650  const ObjectAddress *thisobj = stackptr->object;
2651 
2652  if (object->classId == thisobj->classId &&
2653  object->objectId == thisobj->objectId)
2654  {
2655  if (object->objectSubId == thisobj->objectSubId)
2656  {
2657  stackptr->flags |= flags;
2658  result = true;
2659  }
2660  else if (thisobj->objectSubId == 0)
2661  {
2662  /*
2663  * We're visiting a column with whole table already on stack.
2664  * As in object_address_present_add_flags(), we can skip
2665  * further processing of the subobject, but we don't want to
2666  * propagate flags for the subobject to the whole object.
2667  */
2668  result = true;
2669  }
2670  else if (object->objectSubId == 0)
2671  {
2672  /*
2673  * We're visiting a table with column already on stack. As in
2674  * object_address_present_add_flags(), we should propagate
2675  * flags for the whole object to each of its subobjects.
2676  */
2677  if (flags)
2678  stackptr->flags |= (flags | DEPFLAG_SUBOBJECT);
2679  }
2680  }
2681  }
2682 
2683  return result;
2684 }
#define DEPFLAG_SUBOBJECT
Definition: dependency.c:106
struct ObjectAddressStack * next
Definition: dependency.c:125
const ObjectAddress * object
Definition: dependency.c:123

Variable Documentation

◆ object_classes

const Oid object_classes[]
static

Definition at line 146 of file dependency.c.

Referenced by add_object_address().