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dependency.c
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1 /*-------------------------------------------------------------------------
2  *
3  * dependency.c
4  * Routines to support inter-object dependencies.
5  *
6  *
7  * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
8  * Portions Copyright (c) 1994, Regents of the University of California
9  *
10  * IDENTIFICATION
11  * src/backend/catalog/dependency.c
12  *
13  *-------------------------------------------------------------------------
14  */
15 #include "postgres.h"
16 
17 #include "access/genam.h"
18 #include "access/htup_details.h"
19 #include "access/table.h"
20 #include "access/xact.h"
21 #include "catalog/catalog.h"
22 #include "catalog/dependency.h"
23 #include "catalog/heap.h"
24 #include "catalog/index.h"
25 #include "catalog/objectaccess.h"
26 #include "catalog/pg_am.h"
27 #include "catalog/pg_amop.h"
28 #include "catalog/pg_amproc.h"
29 #include "catalog/pg_attrdef.h"
30 #include "catalog/pg_authid.h"
31 #include "catalog/pg_cast.h"
32 #include "catalog/pg_collation.h"
33 #include "catalog/pg_constraint.h"
34 #include "catalog/pg_conversion.h"
35 #include "catalog/pg_database.h"
36 #include "catalog/pg_default_acl.h"
37 #include "catalog/pg_depend.h"
39 #include "catalog/pg_extension.h"
42 #include "catalog/pg_init_privs.h"
43 #include "catalog/pg_language.h"
44 #include "catalog/pg_largeobject.h"
45 #include "catalog/pg_namespace.h"
46 #include "catalog/pg_opclass.h"
47 #include "catalog/pg_operator.h"
48 #include "catalog/pg_opfamily.h"
49 #include "catalog/pg_policy.h"
50 #include "catalog/pg_proc.h"
51 #include "catalog/pg_publication.h"
53 #include "catalog/pg_rewrite.h"
56 #include "catalog/pg_tablespace.h"
57 #include "catalog/pg_transform.h"
58 #include "catalog/pg_trigger.h"
59 #include "catalog/pg_ts_config.h"
60 #include "catalog/pg_ts_dict.h"
61 #include "catalog/pg_ts_parser.h"
62 #include "catalog/pg_ts_template.h"
63 #include "catalog/pg_type.h"
65 #include "commands/comment.h"
66 #include "commands/defrem.h"
67 #include "commands/event_trigger.h"
68 #include "commands/extension.h"
69 #include "commands/policy.h"
71 #include "commands/seclabel.h"
72 #include "commands/sequence.h"
73 #include "commands/trigger.h"
74 #include "commands/typecmds.h"
75 #include "nodes/nodeFuncs.h"
76 #include "parser/parsetree.h"
77 #include "rewrite/rewriteRemove.h"
78 #include "storage/lmgr.h"
79 #include "utils/acl.h"
80 #include "utils/fmgroids.h"
81 #include "utils/guc.h"
82 #include "utils/lsyscache.h"
83 #include "utils/syscache.h"
84 
85 
86 /*
87  * Deletion processing requires additional state for each ObjectAddress that
88  * it's planning to delete. For simplicity and code-sharing we make the
89  * ObjectAddresses code support arrays with or without this extra state.
90  */
91 typedef struct
92 {
93  int flags; /* bitmask, see bit definitions below */
94  ObjectAddress dependee; /* object whose deletion forced this one */
96 
97 /* ObjectAddressExtra flag bits */
98 #define DEPFLAG_ORIGINAL 0x0001 /* an original deletion target */
99 #define DEPFLAG_NORMAL 0x0002 /* reached via normal dependency */
100 #define DEPFLAG_AUTO 0x0004 /* reached via auto dependency */
101 #define DEPFLAG_INTERNAL 0x0008 /* reached via internal dependency */
102 #define DEPFLAG_PARTITION 0x0010 /* reached via partition dependency */
103 #define DEPFLAG_EXTENSION 0x0020 /* reached via extension dependency */
104 #define DEPFLAG_REVERSE 0x0040 /* reverse internal/extension link */
105 #define DEPFLAG_IS_PART 0x0080 /* has a partition dependency */
106 #define DEPFLAG_SUBOBJECT 0x0100 /* subobject of another deletable object */
107 
108 
109 /* expansible list of ObjectAddresses */
111 {
112  ObjectAddress *refs; /* => palloc'd array */
113  ObjectAddressExtra *extras; /* => palloc'd array, or NULL if not used */
114  int numrefs; /* current number of references */
115  int maxrefs; /* current size of palloc'd array(s) */
116 };
117 
118 /* typedef ObjectAddresses appears in dependency.h */
119 
120 /* threaded list of ObjectAddresses, for recursion detection */
121 typedef struct ObjectAddressStack
122 {
123  const ObjectAddress *object; /* object being visited */
124  int flags; /* its current flag bits */
125  struct ObjectAddressStack *next; /* next outer stack level */
127 
128 /* temporary storage in findDependentObjects */
129 typedef struct
130 {
131  ObjectAddress obj; /* object to be deleted --- MUST BE FIRST */
132  int subflags; /* flags to pass down when recursing to obj */
134 
135 /* for find_expr_references_walker */
136 typedef struct
137 {
138  ObjectAddresses *addrs; /* addresses being accumulated */
139  List *rtables; /* list of rangetables to resolve Vars */
141 
142 /*
143  * This constant table maps ObjectClasses to the corresponding catalog OIDs.
144  * See also getObjectClass().
145  */
146 static const Oid object_classes[] = {
147  RelationRelationId, /* OCLASS_CLASS */
148  ProcedureRelationId, /* OCLASS_PROC */
149  TypeRelationId, /* OCLASS_TYPE */
150  CastRelationId, /* OCLASS_CAST */
151  CollationRelationId, /* OCLASS_COLLATION */
152  ConstraintRelationId, /* OCLASS_CONSTRAINT */
153  ConversionRelationId, /* OCLASS_CONVERSION */
154  AttrDefaultRelationId, /* OCLASS_DEFAULT */
155  LanguageRelationId, /* OCLASS_LANGUAGE */
156  LargeObjectRelationId, /* OCLASS_LARGEOBJECT */
157  OperatorRelationId, /* OCLASS_OPERATOR */
158  OperatorClassRelationId, /* OCLASS_OPCLASS */
159  OperatorFamilyRelationId, /* OCLASS_OPFAMILY */
160  AccessMethodRelationId, /* OCLASS_AM */
161  AccessMethodOperatorRelationId, /* OCLASS_AMOP */
162  AccessMethodProcedureRelationId, /* OCLASS_AMPROC */
163  RewriteRelationId, /* OCLASS_REWRITE */
164  TriggerRelationId, /* OCLASS_TRIGGER */
165  NamespaceRelationId, /* OCLASS_SCHEMA */
166  StatisticExtRelationId, /* OCLASS_STATISTIC_EXT */
167  TSParserRelationId, /* OCLASS_TSPARSER */
168  TSDictionaryRelationId, /* OCLASS_TSDICT */
169  TSTemplateRelationId, /* OCLASS_TSTEMPLATE */
170  TSConfigRelationId, /* OCLASS_TSCONFIG */
171  AuthIdRelationId, /* OCLASS_ROLE */
172  DatabaseRelationId, /* OCLASS_DATABASE */
173  TableSpaceRelationId, /* OCLASS_TBLSPACE */
174  ForeignDataWrapperRelationId, /* OCLASS_FDW */
175  ForeignServerRelationId, /* OCLASS_FOREIGN_SERVER */
176  UserMappingRelationId, /* OCLASS_USER_MAPPING */
177  DefaultAclRelationId, /* OCLASS_DEFACL */
178  ExtensionRelationId, /* OCLASS_EXTENSION */
179  EventTriggerRelationId, /* OCLASS_EVENT_TRIGGER */
180  PolicyRelationId, /* OCLASS_POLICY */
181  PublicationRelationId, /* OCLASS_PUBLICATION */
182  PublicationRelRelationId, /* OCLASS_PUBLICATION_REL */
183  SubscriptionRelationId, /* OCLASS_SUBSCRIPTION */
184  TransformRelationId /* OCLASS_TRANSFORM */
185 };
186 
187 
188 static void findDependentObjects(const ObjectAddress *object,
189  int objflags,
190  int flags,
191  ObjectAddressStack *stack,
192  ObjectAddresses *targetObjects,
193  const ObjectAddresses *pendingObjects,
194  Relation *depRel);
195 static void reportDependentObjects(const ObjectAddresses *targetObjects,
196  DropBehavior behavior,
197  int flags,
198  const ObjectAddress *origObject);
199 static void deleteOneObject(const ObjectAddress *object,
200  Relation *depRel, int32 flags);
201 static void doDeletion(const ObjectAddress *object, int flags);
202 static bool find_expr_references_walker(Node *node,
205 static int object_address_comparator(const void *a, const void *b);
206 static void add_object_address(ObjectClass oclass, Oid objectId, int32 subId,
207  ObjectAddresses *addrs);
208 static void add_exact_object_address_extra(const ObjectAddress *object,
209  const ObjectAddressExtra *extra,
210  ObjectAddresses *addrs);
211 static bool object_address_present_add_flags(const ObjectAddress *object,
212  int flags,
213  ObjectAddresses *addrs);
214 static bool stack_address_present_add_flags(const ObjectAddress *object,
215  int flags,
216  ObjectAddressStack *stack);
217 static void DeleteInitPrivs(const ObjectAddress *object);
218 
219 
220 /*
221  * Go through the objects given running the final actions on them, and execute
222  * the actual deletion.
223  */
224 static void
226  int flags)
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 }
272 
273 /*
274  * performDeletion: attempt to drop the specified object. If CASCADE
275  * behavior is specified, also drop any dependent objects (recursively).
276  * If RESTRICT behavior is specified, error out if there are any dependent
277  * objects, except for those that should be implicitly dropped anyway
278  * according to the dependency type.
279  *
280  * This is the outer control routine for all forms of DROP that drop objects
281  * that can participate in dependencies. Note that performMultipleDeletions
282  * is a variant on the same theme; if you change anything here you'll likely
283  * need to fix that too.
284  *
285  * Bits in the flags argument can include:
286  *
287  * PERFORM_DELETION_INTERNAL: indicates that the drop operation is not the
288  * direct result of a user-initiated action. For example, when a temporary
289  * schema is cleaned out so that a new backend can use it, or when a column
290  * default is dropped as an intermediate step while adding a new one, that's
291  * an internal operation. On the other hand, when we drop something because
292  * the user issued a DROP statement against it, that's not internal. Currently
293  * this suppresses calling event triggers and making some permissions checks.
294  *
295  * PERFORM_DELETION_CONCURRENTLY: perform the drop concurrently. This does
296  * not currently work for anything except dropping indexes; don't set it for
297  * other object types or you may get strange results.
298  *
299  * PERFORM_DELETION_QUIETLY: reduce message level from NOTICE to DEBUG2.
300  *
301  * PERFORM_DELETION_SKIP_ORIGINAL: do not delete the specified object(s),
302  * but only what depends on it/them.
303  *
304  * PERFORM_DELETION_SKIP_EXTENSIONS: do not delete extensions, even when
305  * deleting objects that are part of an extension. This should generally
306  * be used only when dropping temporary objects.
307  *
308  * PERFORM_DELETION_CONCURRENT_LOCK: perform the drop normally but with a lock
309  * as if it were concurrent. This is used by REINDEX CONCURRENTLY.
310  *
311  */
312 void
314  DropBehavior behavior, int flags)
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 }
361 
362 /*
363  * performMultipleDeletions: Similar to performDeletion, but act on multiple
364  * objects at once.
365  *
366  * The main difference from issuing multiple performDeletion calls is that the
367  * list of objects that would be implicitly dropped, for each object to be
368  * dropped, is the union of the implicit-object list for all objects. This
369  * makes each check be more relaxed.
370  */
371 void
373  DropBehavior behavior, int flags)
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 }
437 
438 /*
439  * findDependentObjects - find all objects that depend on 'object'
440  *
441  * For every object that depends on the starting object, acquire a deletion
442  * lock on the object, add it to targetObjects (if not already there),
443  * and recursively find objects that depend on it. An object's dependencies
444  * will be placed into targetObjects before the object itself; this means
445  * that the finished list's order represents a safe deletion order.
446  *
447  * The caller must already have a deletion lock on 'object' itself,
448  * but must not have added it to targetObjects. (Note: there are corner
449  * cases where we won't add the object either, and will also release the
450  * caller-taken lock. This is a bit ugly, but the API is set up this way
451  * to allow easy rechecking of an object's liveness after we lock it. See
452  * notes within the function.)
453  *
454  * When dropping a whole object (subId = 0), we find dependencies for
455  * its sub-objects too.
456  *
457  * object: the object to add to targetObjects and find dependencies on
458  * objflags: flags to be ORed into the object's targetObjects entry
459  * flags: PERFORM_DELETION_xxx flags for the deletion operation as a whole
460  * stack: list of objects being visited in current recursion; topmost item
461  * is the object that we recursed from (NULL for external callers)
462  * targetObjects: list of objects that are scheduled to be deleted
463  * pendingObjects: list of other objects slated for destruction, but
464  * not necessarily in targetObjects yet (can be NULL if none)
465  * *depRel: already opened pg_depend relation
466  *
467  * Note: objflags describes the reason for visiting this particular object
468  * at this time, and is not passed down when recursing. The flags argument
469  * is passed down, since it describes what we're doing overall.
470  */
471 static void
473  int objflags,
474  int flags,
475  ObjectAddressStack *stack,
476  ObjectAddresses *targetObjects,
477  const ObjectAddresses *pendingObjects,
478  Relation *depRel)
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 }
999 
1000 /*
1001  * reportDependentObjects - report about dependencies, and fail if RESTRICT
1002  *
1003  * Tell the user about dependent objects that we are going to delete
1004  * (or would need to delete, but are prevented by RESTRICT mode);
1005  * then error out if there are any and it's not CASCADE mode.
1006  *
1007  * targetObjects: list of objects that are scheduled to be deleted
1008  * behavior: RESTRICT or CASCADE
1009  * flags: other flags for the deletion operation
1010  * origObject: base object of deletion, or NULL if not available
1011  * (the latter case occurs in DROP OWNED)
1012  */
1013 static void
1015  DropBehavior behavior,
1016  int flags,
1017  const ObjectAddress *origObject)
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 }
1209 
1210 /*
1211  * Drop an object by OID. Works for most catalogs, if no special processing
1212  * is needed.
1213  */
1214 static void
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 }
1265 
1266 /*
1267  * deleteOneObject: delete a single object for performDeletion.
1268  *
1269  * *depRel is the already-open pg_depend relation.
1270  */
1271 static void
1272 deleteOneObject(const ObjectAddress *object, Relation *depRel, int flags)
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 }
1371 
1372 /*
1373  * doDeletion: actually delete a single object
1374  */
1375 static void
1376 doDeletion(const ObjectAddress *object, int flags)
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 }
1502 
1503 /*
1504  * AcquireDeletionLock - acquire a suitable lock for deleting an object
1505  *
1506  * Accepts the same flags as performDeletion (though currently only
1507  * PERFORM_DELETION_CONCURRENTLY does anything).
1508  *
1509  * We use LockRelation for relations, LockDatabaseObject for everything
1510  * else. Shared-across-databases objects are not currently supported
1511  * because no caller cares, but could be modified to use LockSharedObject.
1512  */
1513 void
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 }
1536 
1537 /*
1538  * ReleaseDeletionLock - release an object deletion lock
1539  *
1540  * Companion to AcquireDeletionLock.
1541  */
1542 void
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 }
1552 
1553 /*
1554  * recordDependencyOnExpr - find expression dependencies
1555  *
1556  * This is used to find the dependencies of rules, constraint expressions,
1557  * etc.
1558  *
1559  * Given an expression or query in node-tree form, find all the objects
1560  * it refers to (tables, columns, operators, functions, etc). Record
1561  * a dependency of the specified type from the given depender object
1562  * to each object mentioned in the expression.
1563  *
1564  * rtable is the rangetable to be used to interpret Vars with varlevelsup=0.
1565  * It can be NIL if no such variables are expected.
1566  */
1567 void
1569  Node *expr, List *rtable,
1570  DependencyType behavior)
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 }
1592 
1593 /*
1594  * recordDependencyOnSingleRelExpr - find expression dependencies
1595  *
1596  * As above, but only one relation is expected to be referenced (with
1597  * varno = 1 and varlevelsup = 0). Pass the relation OID instead of a
1598  * range table. An additional frammish is that dependencies on that
1599  * relation's component columns will be marked with 'self_behavior',
1600  * whereas 'behavior' is used for everything else; also, if 'reverse_self'
1601  * is true, those dependencies are reversed so that the columns are made
1602  * to depend on the table not vice versa.
1603  *
1604  * NOTE: the caller should ensure that a whole-table dependency on the
1605  * specified relation is created separately, if one is needed. In particular,
1606  * a whole-row Var "relation.*" will not cause this routine to emit any
1607  * dependency item. This is appropriate behavior for subexpressions of an
1608  * ordinary query, so other cases need to cope as necessary.
1609  */
1610 void
1612  Node *expr, Oid relId,
1613  DependencyType behavior,
1614  DependencyType self_behavior,
1615  bool reverse_self)
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 }
1699 
1700 /*
1701  * Recursively search an expression tree for object references.
1702  *
1703  * Note: in many cases we do not need to create dependencies on the datatypes
1704  * involved in an expression, because we'll have an indirect dependency via
1705  * some other object. For instance Var nodes depend on a column which depends
1706  * on the datatype, and OpExpr nodes depend on the operator which depends on
1707  * the datatype. However we do need a type dependency if there is no such
1708  * indirect dependency, as for example in Const and CoerceToDomain nodes.
1709  *
1710  * Similarly, we don't need to create dependencies on collations except where
1711  * the collation is being freshly introduced to the expression.
1712  */
1713 static bool
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 }
2318 
2319 /*
2320  * Given an array of dependency references, eliminate any duplicates.
2321  */
2322 static void
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 }
2378 
2379 /*
2380  * qsort comparator for ObjectAddress items
2381  */
2382 static int
2383 object_address_comparator(const void *a, const void *b)
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 }
2420 
2421 /*
2422  * Routines for handling an expansible array of ObjectAddress items.
2423  *
2424  * new_object_addresses: create a new ObjectAddresses array.
2425  */
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 }
2441 
2442 /*
2443  * Add an entry to an ObjectAddresses array.
2444  *
2445  * It is convenient to specify the class by ObjectClass rather than directly
2446  * by catalog OID.
2447  */
2448 static void
2449 add_object_address(ObjectClass oclass, Oid objectId, int32 subId,
2450  ObjectAddresses *addrs)
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 }
2475 
2476 /*
2477  * Add an entry to an ObjectAddresses array.
2478  *
2479  * As above, but specify entry exactly.
2480  */
2481 void
2483  ObjectAddresses *addrs)
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 }
2500 
2501 /*
2502  * Add an entry to an ObjectAddresses array.
2503  *
2504  * As above, but specify entry exactly and provide some "extra" data too.
2505  */
2506 static void
2508  const ObjectAddressExtra *extra,
2509  ObjectAddresses *addrs)
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 }
2535 
2536 /*
2537  * Test whether an object is present in an ObjectAddresses array.
2538  *
2539  * We return "true" if object is a subobject of something in the array, too.
2540  */
2541 bool
2543  const ObjectAddresses *addrs)
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 }
2562 
2563 /*
2564  * As above, except that if the object is present then also OR the given
2565  * flags into its associated extra data (which must exist).
2566  */
2567 static bool
2569  int flags,
2570  ObjectAddresses *addrs)
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 }
2636 
2637 /*
2638  * Similar to above, except we search an ObjectAddressStack.
2639  */
2640 static bool
2642  int flags,
2643  ObjectAddressStack *stack)
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 }
2685 
2686 /*
2687  * Record multiple dependencies from an ObjectAddresses array, after first
2688  * removing any duplicates.
2689  */
2690 void
2692  ObjectAddresses *referenced,
2693  DependencyType behavior)
2694 {
2696  recordMultipleDependencies(depender,
2697  referenced->refs, referenced->numrefs,
2698  behavior);
2699 }
2700 
2701 /*
2702  * Sort the items in an ObjectAddresses array.
2703  *
2704  * The major sort key is OID-descending, so that newer objects will be listed
2705  * first in most cases. This is primarily useful for ensuring stable outputs
2706  * from regression tests; it's not recommended if the order of the objects is
2707  * determined by user input, such as the order of targets in a DROP command.
2708  */
2709 void
2711 {
2712  if (addrs->numrefs > 1)
2713  qsort((void *) addrs->refs, addrs->numrefs,
2714  sizeof(ObjectAddress),
2716 }
2717 
2718 /*
2719  * Clean up when done with an ObjectAddresses array.
2720  */
2721 void
2723 {
2724  pfree(addrs->refs);
2725  if (addrs->extras)
2726  pfree(addrs->extras);
2727  pfree(addrs);
2728 }
2729 
2730 /*
2731  * Determine the class of a given object identified by objectAddress.
2732  *
2733  * This function is essentially the reverse mapping for the object_classes[]
2734  * table. We implement it as a function because the OIDs aren't consecutive.
2735  */
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 }
2867 
2868 /*
2869  * delete initial ACL for extension objects
2870  */
2871 static void
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 }
Datum constvalue
Definition: primnodes.h:219
static void findDependentObjects(const ObjectAddress *object, int objflags, int flags, ObjectAddressStack *stack, ObjectAddresses *targetObjects, const ObjectAddresses *pendingObjects, Relation *depRel)
Definition: dependency.c:472
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Definition: trigger.c:1251
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Definition: extension.c:72
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Definition: dependency.h:31
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Definition: htup_details.h:654
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Definition: index.c:2091
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Definition: dependency.c:2507
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Definition: dependency.c:1714
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Definition: statscmds.c:683
AttrNumber get_object_attnum_oid(Oid class_id)
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Definition: elog.c:1019
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Definition: lmgr.c:200
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Definition: extension.c:1867
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Definition: dependency.c:138
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Definition: parsenodes.h:180
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Definition: lsyscache.c:1974
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Definition: postgres.h:544
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Definition: seclabel.c:521
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Definition: dependency.h:130
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Definition: parsenodes.h:1385
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Definition: lockdefs.h:36
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Definition: elog.c:698
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Definition: primnodes.h:191
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Definition: primnodes.h:808
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Definition: indexing.c:350
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Definition: dependency.c:2482
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Definition: dependency.c:2427
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Definition: dependency.c:2722
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Definition: primnodes.h:186
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Definition: typecmds.c:653
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Definition: dependency.c:2737
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Definition: dependency.c:125
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Definition: dependency.c:2323
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Definition: genam.c:383
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Definition: primnodes.h:92
signed int int32
Definition: c.h:429
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Definition: parsenodes.h:150
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Definition: genam.c:561
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Definition: operatorcmds.c:364
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Definition: dependency.h:134
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Definition: dependency.c:131
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Definition: lsyscache.c:2678
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Definition: stringinfo.c:91
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Definition: dependency.c:146
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Definition: primnodes.h:271
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Definition: dependency.c:100
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Definition: htup.h:65
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Definition: dependency.c:123
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Definition: elog.c:270
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Definition: policy.c:335
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Definition: dependency.c:112
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Definition: dependency.h:88
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Definition: lockdefs.h:38
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Definition: elog.c:1042
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Definition: dependency.c:1014
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Definition: elog.c:1090
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Definition: primnodes.h:386
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Definition: pg_depend.h:72
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Definition: sequence.c:526
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#define rt_fetch(rangetable_index, rangetable)
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Definition: stringinfo.c:188
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Definition: stringinfo.c:59
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Definition: syscache.c:1127
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Definition: syscache.c:1175
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Definition: primnodes.h:90
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Definition: extension.c:71
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Definition: lockdefs.h:39
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Definition: pg_depend.c:56
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Definition: dependency.h:135
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Definition: lockdefs.h:45
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Definition: mcxt.c:1062
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Definition: rewriteRemove.c:39
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Definition: elog.h:232
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Definition: dependency.c:2872
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Definition: scankey.c:76
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Definition: dependency.c:225
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Definition: dependency.c:372
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Definition: table.c:39
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Definition: dependency.h:137
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Definition: heap.c:1902
Definition: pg_list.h:50
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#define _(x)
Definition: elog.c:89
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Definition: primnodes.h:220
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Definition: stratnum.h:31
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Definition: list.c:875
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