Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * dependency.c
4 : * Routines to support inter-object dependencies.
5 : *
6 : *
7 : * Portions Copyright (c) 1996-2024, 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_auth_members.h"
32 : #include "catalog/pg_cast.h"
33 : #include "catalog/pg_collation.h"
34 : #include "catalog/pg_constraint.h"
35 : #include "catalog/pg_conversion.h"
36 : #include "catalog/pg_database.h"
37 : #include "catalog/pg_default_acl.h"
38 : #include "catalog/pg_depend.h"
39 : #include "catalog/pg_event_trigger.h"
40 : #include "catalog/pg_extension.h"
41 : #include "catalog/pg_foreign_data_wrapper.h"
42 : #include "catalog/pg_foreign_server.h"
43 : #include "catalog/pg_init_privs.h"
44 : #include "catalog/pg_language.h"
45 : #include "catalog/pg_largeobject.h"
46 : #include "catalog/pg_namespace.h"
47 : #include "catalog/pg_opclass.h"
48 : #include "catalog/pg_operator.h"
49 : #include "catalog/pg_opfamily.h"
50 : #include "catalog/pg_parameter_acl.h"
51 : #include "catalog/pg_policy.h"
52 : #include "catalog/pg_proc.h"
53 : #include "catalog/pg_publication.h"
54 : #include "catalog/pg_publication_namespace.h"
55 : #include "catalog/pg_publication_rel.h"
56 : #include "catalog/pg_rewrite.h"
57 : #include "catalog/pg_statistic_ext.h"
58 : #include "catalog/pg_subscription.h"
59 : #include "catalog/pg_tablespace.h"
60 : #include "catalog/pg_transform.h"
61 : #include "catalog/pg_trigger.h"
62 : #include "catalog/pg_ts_config.h"
63 : #include "catalog/pg_ts_dict.h"
64 : #include "catalog/pg_ts_parser.h"
65 : #include "catalog/pg_ts_template.h"
66 : #include "catalog/pg_type.h"
67 : #include "catalog/pg_user_mapping.h"
68 : #include "commands/comment.h"
69 : #include "commands/defrem.h"
70 : #include "commands/event_trigger.h"
71 : #include "commands/extension.h"
72 : #include "commands/policy.h"
73 : #include "commands/publicationcmds.h"
74 : #include "commands/seclabel.h"
75 : #include "commands/sequence.h"
76 : #include "commands/trigger.h"
77 : #include "commands/typecmds.h"
78 : #include "funcapi.h"
79 : #include "miscadmin.h"
80 : #include "nodes/nodeFuncs.h"
81 : #include "parser/parsetree.h"
82 : #include "rewrite/rewriteRemove.h"
83 : #include "storage/lmgr.h"
84 : #include "utils/fmgroids.h"
85 : #include "utils/lsyscache.h"
86 : #include "utils/syscache.h"
87 :
88 :
89 : /*
90 : * Deletion processing requires additional state for each ObjectAddress that
91 : * it's planning to delete. For simplicity and code-sharing we make the
92 : * ObjectAddresses code support arrays with or without this extra state.
93 : */
94 : typedef struct
95 : {
96 : int flags; /* bitmask, see bit definitions below */
97 : ObjectAddress dependee; /* object whose deletion forced this one */
98 : } ObjectAddressExtra;
99 :
100 : /* ObjectAddressExtra flag bits */
101 : #define DEPFLAG_ORIGINAL 0x0001 /* an original deletion target */
102 : #define DEPFLAG_NORMAL 0x0002 /* reached via normal dependency */
103 : #define DEPFLAG_AUTO 0x0004 /* reached via auto dependency */
104 : #define DEPFLAG_INTERNAL 0x0008 /* reached via internal dependency */
105 : #define DEPFLAG_PARTITION 0x0010 /* reached via partition dependency */
106 : #define DEPFLAG_EXTENSION 0x0020 /* reached via extension dependency */
107 : #define DEPFLAG_REVERSE 0x0040 /* reverse internal/extension link */
108 : #define DEPFLAG_IS_PART 0x0080 /* has a partition dependency */
109 : #define DEPFLAG_SUBOBJECT 0x0100 /* subobject of another deletable object */
110 :
111 :
112 : /* expansible list of ObjectAddresses */
113 : struct ObjectAddresses
114 : {
115 : ObjectAddress *refs; /* => palloc'd array */
116 : ObjectAddressExtra *extras; /* => palloc'd array, or NULL if not used */
117 : int numrefs; /* current number of references */
118 : int maxrefs; /* current size of palloc'd array(s) */
119 : };
120 :
121 : /* typedef ObjectAddresses appears in dependency.h */
122 :
123 : /* threaded list of ObjectAddresses, for recursion detection */
124 : typedef struct ObjectAddressStack
125 : {
126 : const ObjectAddress *object; /* object being visited */
127 : int flags; /* its current flag bits */
128 : struct ObjectAddressStack *next; /* next outer stack level */
129 : } ObjectAddressStack;
130 :
131 : /* temporary storage in findDependentObjects */
132 : typedef struct
133 : {
134 : ObjectAddress obj; /* object to be deleted --- MUST BE FIRST */
135 : int subflags; /* flags to pass down when recursing to obj */
136 : } ObjectAddressAndFlags;
137 :
138 : /* for find_expr_references_walker */
139 : typedef struct
140 : {
141 : ObjectAddresses *addrs; /* addresses being accumulated */
142 : List *rtables; /* list of rangetables to resolve Vars */
143 : } find_expr_references_context;
144 :
145 :
146 : static void findDependentObjects(const ObjectAddress *object,
147 : int objflags,
148 : int flags,
149 : ObjectAddressStack *stack,
150 : ObjectAddresses *targetObjects,
151 : const ObjectAddresses *pendingObjects,
152 : Relation *depRel);
153 : static void reportDependentObjects(const ObjectAddresses *targetObjects,
154 : DropBehavior behavior,
155 : int flags,
156 : const ObjectAddress *origObject);
157 : static void deleteOneObject(const ObjectAddress *object,
158 : Relation *depRel, int32 flags);
159 : static void doDeletion(const ObjectAddress *object, int flags);
160 : static bool find_expr_references_walker(Node *node,
161 : find_expr_references_context *context);
162 : static void process_function_rte_ref(RangeTblEntry *rte, AttrNumber attnum,
163 : find_expr_references_context *context);
164 : static void eliminate_duplicate_dependencies(ObjectAddresses *addrs);
165 : static int object_address_comparator(const void *a, const void *b);
166 : static void add_object_address(Oid classId, Oid objectId, int32 subId,
167 : ObjectAddresses *addrs);
168 : static void add_exact_object_address_extra(const ObjectAddress *object,
169 : const ObjectAddressExtra *extra,
170 : ObjectAddresses *addrs);
171 : static bool object_address_present_add_flags(const ObjectAddress *object,
172 : int flags,
173 : ObjectAddresses *addrs);
174 : static bool stack_address_present_add_flags(const ObjectAddress *object,
175 : int flags,
176 : ObjectAddressStack *stack);
177 : static void DeleteInitPrivs(const ObjectAddress *object);
178 :
179 :
180 : /*
181 : * Go through the objects given running the final actions on them, and execute
182 : * the actual deletion.
183 : */
184 : static void
185 29920 : deleteObjectsInList(ObjectAddresses *targetObjects, Relation *depRel,
186 : int flags)
187 : {
188 : int i;
189 :
190 : /*
191 : * Keep track of objects for event triggers, if necessary.
192 : */
193 29920 : if (trackDroppedObjectsNeeded() && !(flags & PERFORM_DELETION_INTERNAL))
194 : {
195 4202 : for (i = 0; i < targetObjects->numrefs; i++)
196 : {
197 3538 : const ObjectAddress *thisobj = &targetObjects->refs[i];
198 3538 : const ObjectAddressExtra *extra = &targetObjects->extras[i];
199 3538 : bool original = false;
200 3538 : bool normal = false;
201 :
202 3538 : if (extra->flags & DEPFLAG_ORIGINAL)
203 748 : original = true;
204 3538 : if (extra->flags & DEPFLAG_NORMAL)
205 330 : normal = true;
206 3538 : if (extra->flags & DEPFLAG_REVERSE)
207 0 : normal = true;
208 :
209 3538 : if (EventTriggerSupportsObject(thisobj))
210 : {
211 3426 : EventTriggerSQLDropAddObject(thisobj, original, normal);
212 : }
213 : }
214 : }
215 :
216 : /*
217 : * Delete all the objects in the proper order, except that if told to, we
218 : * should skip the original object(s).
219 : */
220 215324 : for (i = 0; i < targetObjects->numrefs; i++)
221 : {
222 185408 : ObjectAddress *thisobj = targetObjects->refs + i;
223 185408 : ObjectAddressExtra *thisextra = targetObjects->extras + i;
224 :
225 185408 : if ((flags & PERFORM_DELETION_SKIP_ORIGINAL) &&
226 8692 : (thisextra->flags & DEPFLAG_ORIGINAL))
227 798 : continue;
228 :
229 184610 : deleteOneObject(thisobj, depRel, flags);
230 : }
231 29916 : }
232 :
233 : /*
234 : * performDeletion: attempt to drop the specified object. If CASCADE
235 : * behavior is specified, also drop any dependent objects (recursively).
236 : * If RESTRICT behavior is specified, error out if there are any dependent
237 : * objects, except for those that should be implicitly dropped anyway
238 : * according to the dependency type.
239 : *
240 : * This is the outer control routine for all forms of DROP that drop objects
241 : * that can participate in dependencies. Note that performMultipleDeletions
242 : * is a variant on the same theme; if you change anything here you'll likely
243 : * need to fix that too.
244 : *
245 : * Bits in the flags argument can include:
246 : *
247 : * PERFORM_DELETION_INTERNAL: indicates that the drop operation is not the
248 : * direct result of a user-initiated action. For example, when a temporary
249 : * schema is cleaned out so that a new backend can use it, or when a column
250 : * default is dropped as an intermediate step while adding a new one, that's
251 : * an internal operation. On the other hand, when we drop something because
252 : * the user issued a DROP statement against it, that's not internal. Currently
253 : * this suppresses calling event triggers and making some permissions checks.
254 : *
255 : * PERFORM_DELETION_CONCURRENTLY: perform the drop concurrently. This does
256 : * not currently work for anything except dropping indexes; don't set it for
257 : * other object types or you may get strange results.
258 : *
259 : * PERFORM_DELETION_QUIETLY: reduce message level from NOTICE to DEBUG2.
260 : *
261 : * PERFORM_DELETION_SKIP_ORIGINAL: do not delete the specified object(s),
262 : * but only what depends on it/them.
263 : *
264 : * PERFORM_DELETION_SKIP_EXTENSIONS: do not delete extensions, even when
265 : * deleting objects that are part of an extension. This should generally
266 : * be used only when dropping temporary objects.
267 : *
268 : * PERFORM_DELETION_CONCURRENT_LOCK: perform the drop normally but with a lock
269 : * as if it were concurrent. This is used by REINDEX CONCURRENTLY.
270 : *
271 : */
272 : void
273 5280 : performDeletion(const ObjectAddress *object,
274 : DropBehavior behavior, int flags)
275 : {
276 : Relation depRel;
277 : ObjectAddresses *targetObjects;
278 :
279 : /*
280 : * We save some cycles by opening pg_depend just once and passing the
281 : * Relation pointer down to all the recursive deletion steps.
282 : */
283 5280 : depRel = table_open(DependRelationId, RowExclusiveLock);
284 :
285 : /*
286 : * Acquire deletion lock on the target object. (Ideally the caller has
287 : * done this already, but many places are sloppy about it.)
288 : */
289 5280 : AcquireDeletionLock(object, 0);
290 :
291 : /*
292 : * Construct a list of objects to delete (ie, the given object plus
293 : * everything directly or indirectly dependent on it).
294 : */
295 5280 : targetObjects = new_object_addresses();
296 :
297 5280 : findDependentObjects(object,
298 : DEPFLAG_ORIGINAL,
299 : flags,
300 : NULL, /* empty stack */
301 : targetObjects,
302 : NULL, /* no pendingObjects */
303 : &depRel);
304 :
305 : /*
306 : * Check if deletion is allowed, and report about cascaded deletes.
307 : */
308 5280 : reportDependentObjects(targetObjects,
309 : behavior,
310 : flags,
311 : object);
312 :
313 : /* do the deed */
314 5244 : deleteObjectsInList(targetObjects, &depRel, flags);
315 :
316 : /* And clean up */
317 5242 : free_object_addresses(targetObjects);
318 :
319 5242 : table_close(depRel, RowExclusiveLock);
320 5242 : }
321 :
322 : /*
323 : * performMultipleDeletions: Similar to performDeletion, but act on multiple
324 : * objects at once.
325 : *
326 : * The main difference from issuing multiple performDeletion calls is that the
327 : * list of objects that would be implicitly dropped, for each object to be
328 : * dropped, is the union of the implicit-object list for all objects. This
329 : * makes each check be more relaxed.
330 : */
331 : void
332 27346 : performMultipleDeletions(const ObjectAddresses *objects,
333 : DropBehavior behavior, int flags)
334 : {
335 : Relation depRel;
336 : ObjectAddresses *targetObjects;
337 : int i;
338 :
339 : /* No work if no objects... */
340 27346 : if (objects->numrefs <= 0)
341 2332 : return;
342 :
343 : /*
344 : * We save some cycles by opening pg_depend just once and passing the
345 : * Relation pointer down to all the recursive deletion steps.
346 : */
347 25014 : depRel = table_open(DependRelationId, RowExclusiveLock);
348 :
349 : /*
350 : * Construct a list of objects to delete (ie, the given objects plus
351 : * everything directly or indirectly dependent on them). Note that
352 : * because we pass the whole objects list as pendingObjects context, we
353 : * won't get a failure from trying to delete an object that is internally
354 : * dependent on another one in the list; we'll just skip that object and
355 : * delete it when we reach its owner.
356 : */
357 25014 : targetObjects = new_object_addresses();
358 :
359 54904 : for (i = 0; i < objects->numrefs; i++)
360 : {
361 29932 : const ObjectAddress *thisobj = objects->refs + i;
362 :
363 : /*
364 : * Acquire deletion lock on each target object. (Ideally the caller
365 : * has done this already, but many places are sloppy about it.)
366 : */
367 29932 : AcquireDeletionLock(thisobj, flags);
368 :
369 29932 : findDependentObjects(thisobj,
370 : DEPFLAG_ORIGINAL,
371 : flags,
372 : NULL, /* empty stack */
373 : targetObjects,
374 : objects,
375 : &depRel);
376 : }
377 :
378 : /*
379 : * Check if deletion is allowed, and report about cascaded deletes.
380 : *
381 : * If there's exactly one object being deleted, report it the same way as
382 : * in performDeletion(), else we have to be vaguer.
383 : */
384 24972 : reportDependentObjects(targetObjects,
385 : behavior,
386 : flags,
387 24972 : (objects->numrefs == 1 ? objects->refs : NULL));
388 :
389 : /* do the deed */
390 24676 : deleteObjectsInList(targetObjects, &depRel, flags);
391 :
392 : /* And clean up */
393 24674 : free_object_addresses(targetObjects);
394 :
395 24674 : table_close(depRel, RowExclusiveLock);
396 : }
397 :
398 : /*
399 : * findDependentObjects - find all objects that depend on 'object'
400 : *
401 : * For every object that depends on the starting object, acquire a deletion
402 : * lock on the object, add it to targetObjects (if not already there),
403 : * and recursively find objects that depend on it. An object's dependencies
404 : * will be placed into targetObjects before the object itself; this means
405 : * that the finished list's order represents a safe deletion order.
406 : *
407 : * The caller must already have a deletion lock on 'object' itself,
408 : * but must not have added it to targetObjects. (Note: there are corner
409 : * cases where we won't add the object either, and will also release the
410 : * caller-taken lock. This is a bit ugly, but the API is set up this way
411 : * to allow easy rechecking of an object's liveness after we lock it. See
412 : * notes within the function.)
413 : *
414 : * When dropping a whole object (subId = 0), we find dependencies for
415 : * its sub-objects too.
416 : *
417 : * object: the object to add to targetObjects and find dependencies on
418 : * objflags: flags to be ORed into the object's targetObjects entry
419 : * flags: PERFORM_DELETION_xxx flags for the deletion operation as a whole
420 : * stack: list of objects being visited in current recursion; topmost item
421 : * is the object that we recursed from (NULL for external callers)
422 : * targetObjects: list of objects that are scheduled to be deleted
423 : * pendingObjects: list of other objects slated for destruction, but
424 : * not necessarily in targetObjects yet (can be NULL if none)
425 : * *depRel: already opened pg_depend relation
426 : *
427 : * Note: objflags describes the reason for visiting this particular object
428 : * at this time, and is not passed down when recursing. The flags argument
429 : * is passed down, since it describes what we're doing overall.
430 : */
431 : static void
432 232812 : findDependentObjects(const ObjectAddress *object,
433 : int objflags,
434 : int flags,
435 : ObjectAddressStack *stack,
436 : ObjectAddresses *targetObjects,
437 : const ObjectAddresses *pendingObjects,
438 : Relation *depRel)
439 : {
440 : ScanKeyData key[3];
441 : int nkeys;
442 : SysScanDesc scan;
443 : HeapTuple tup;
444 : ObjectAddress otherObject;
445 : ObjectAddress owningObject;
446 : ObjectAddress partitionObject;
447 : ObjectAddressAndFlags *dependentObjects;
448 : int numDependentObjects;
449 : int maxDependentObjects;
450 : ObjectAddressStack mystack;
451 : ObjectAddressExtra extra;
452 :
453 : /*
454 : * If the target object is already being visited in an outer recursion
455 : * level, just report the current objflags back to that level and exit.
456 : * This is needed to avoid infinite recursion in the face of circular
457 : * dependencies.
458 : *
459 : * The stack check alone would result in dependency loops being broken at
460 : * an arbitrary point, ie, the first member object of the loop to be
461 : * visited is the last one to be deleted. This is obviously unworkable.
462 : * However, the check for internal dependency below guarantees that we
463 : * will not break a loop at an internal dependency: if we enter the loop
464 : * at an "owned" object we will switch and start at the "owning" object
465 : * instead. We could probably hack something up to avoid breaking at an
466 : * auto dependency, too, if we had to. However there are no known cases
467 : * where that would be necessary.
468 : */
469 232812 : if (stack_address_present_add_flags(object, objflags, stack))
470 43290 : return;
471 :
472 : /*
473 : * since this function recurses, it could be driven to stack overflow,
474 : * because of the deep dependency tree, not only due to dependency loops.
475 : */
476 232542 : check_stack_depth();
477 :
478 : /*
479 : * It's also possible that the target object has already been completely
480 : * processed and put into targetObjects. If so, again we just add the
481 : * specified objflags to its entry and return.
482 : *
483 : * (Note: in these early-exit cases we could release the caller-taken
484 : * lock, since the object is presumably now locked multiple times; but it
485 : * seems not worth the cycles.)
486 : */
487 232542 : if (object_address_present_add_flags(object, objflags, targetObjects))
488 41536 : return;
489 :
490 : /*
491 : * If the target object is pinned, we can just error out immediately; it
492 : * won't have any objects recorded as depending on it.
493 : */
494 191006 : if (IsPinnedObject(object->classId, object->objectId))
495 2 : ereport(ERROR,
496 : (errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
497 : errmsg("cannot drop %s because it is required by the database system",
498 : getObjectDescription(object, false))));
499 :
500 : /*
501 : * The target object might be internally dependent on some other object
502 : * (its "owner"), and/or be a member of an extension (also considered its
503 : * owner). If so, and if we aren't recursing from the owning object, we
504 : * have to transform this deletion request into a deletion request of the
505 : * owning object. (We'll eventually recurse back to this object, but the
506 : * owning object has to be visited first so it will be deleted after.) The
507 : * way to find out about this is to scan the pg_depend entries that show
508 : * what this object depends on.
509 : */
510 191004 : ScanKeyInit(&key[0],
511 : Anum_pg_depend_classid,
512 : BTEqualStrategyNumber, F_OIDEQ,
513 : ObjectIdGetDatum(object->classId));
514 191004 : ScanKeyInit(&key[1],
515 : Anum_pg_depend_objid,
516 : BTEqualStrategyNumber, F_OIDEQ,
517 : ObjectIdGetDatum(object->objectId));
518 191004 : if (object->objectSubId != 0)
519 : {
520 : /* Consider only dependencies of this sub-object */
521 2136 : ScanKeyInit(&key[2],
522 : Anum_pg_depend_objsubid,
523 : BTEqualStrategyNumber, F_INT4EQ,
524 : Int32GetDatum(object->objectSubId));
525 2136 : nkeys = 3;
526 : }
527 : else
528 : {
529 : /* Consider dependencies of this object and any sub-objects it has */
530 188868 : nkeys = 2;
531 : }
532 :
533 191004 : scan = systable_beginscan(*depRel, DependDependerIndexId, true,
534 : NULL, nkeys, key);
535 :
536 : /* initialize variables that loop may fill */
537 191004 : memset(&owningObject, 0, sizeof(owningObject));
538 191004 : memset(&partitionObject, 0, sizeof(partitionObject));
539 :
540 457638 : while (HeapTupleIsValid(tup = systable_getnext(scan)))
541 : {
542 268118 : Form_pg_depend foundDep = (Form_pg_depend) GETSTRUCT(tup);
543 :
544 268118 : otherObject.classId = foundDep->refclassid;
545 268118 : otherObject.objectId = foundDep->refobjid;
546 268118 : otherObject.objectSubId = foundDep->refobjsubid;
547 :
548 : /*
549 : * When scanning dependencies of a whole object, we may find rows
550 : * linking sub-objects of the object to the object itself. (Normally,
551 : * such a dependency is implicit, but we must make explicit ones in
552 : * some cases involving partitioning.) We must ignore such rows to
553 : * avoid infinite recursion.
554 : */
555 268118 : if (otherObject.classId == object->classId &&
556 93718 : otherObject.objectId == object->objectId &&
557 4304 : object->objectSubId == 0)
558 4280 : continue;
559 :
560 263838 : switch (foundDep->deptype)
561 : {
562 150334 : case DEPENDENCY_NORMAL:
563 : case DEPENDENCY_AUTO:
564 : case DEPENDENCY_AUTO_EXTENSION:
565 : /* no problem */
566 150334 : break;
567 :
568 3144 : case DEPENDENCY_EXTENSION:
569 :
570 : /*
571 : * If told to, ignore EXTENSION dependencies altogether. This
572 : * flag is normally used to prevent dropping extensions during
573 : * temporary-object cleanup, even if a temp object was created
574 : * during an extension script.
575 : */
576 3144 : if (flags & PERFORM_DELETION_SKIP_EXTENSIONS)
577 8 : break;
578 :
579 : /*
580 : * If the other object is the extension currently being
581 : * created/altered, ignore this dependency and continue with
582 : * the deletion. This allows dropping of an extension's
583 : * objects within the extension's scripts, as well as corner
584 : * cases such as dropping a transient object created within
585 : * such a script.
586 : */
587 3136 : if (creating_extension &&
588 286 : otherObject.classId == ExtensionRelationId &&
589 286 : otherObject.objectId == CurrentExtensionObject)
590 286 : break;
591 :
592 : /* Otherwise, treat this like an internal dependency */
593 : /* FALL THRU */
594 :
595 : case DEPENDENCY_INTERNAL:
596 :
597 : /*
598 : * This object is part of the internal implementation of
599 : * another object, or is part of the extension that is the
600 : * other object. We have three cases:
601 : *
602 : * 1. At the outermost recursion level, we must disallow the
603 : * DROP. However, if the owning object is listed in
604 : * pendingObjects, just release the caller's lock and return;
605 : * we'll eventually complete the DROP when we reach that entry
606 : * in the pending list.
607 : *
608 : * Note: the above statement is true only if this pg_depend
609 : * entry still exists by then; in principle, therefore, we
610 : * could miss deleting an item the user told us to delete.
611 : * However, no inconsistency can result: since we're at outer
612 : * level, there is no object depending on this one.
613 : */
614 103186 : if (stack == NULL)
615 : {
616 80 : if (pendingObjects &&
617 40 : object_address_present(&otherObject, pendingObjects))
618 : {
619 0 : systable_endscan(scan);
620 : /* need to release caller's lock; see notes below */
621 0 : ReleaseDeletionLock(object);
622 0 : return;
623 : }
624 :
625 : /*
626 : * We postpone actually issuing the error message until
627 : * after this loop, so that we can make the behavior
628 : * independent of the ordering of pg_depend entries, at
629 : * least if there's not more than one INTERNAL and one
630 : * EXTENSION dependency. (If there's more, we'll complain
631 : * about a random one of them.) Prefer to complain about
632 : * EXTENSION, since that's generally a more important
633 : * dependency.
634 : */
635 40 : if (!OidIsValid(owningObject.classId) ||
636 0 : foundDep->deptype == DEPENDENCY_EXTENSION)
637 40 : owningObject = otherObject;
638 40 : break;
639 : }
640 :
641 : /*
642 : * 2. When recursing from the other end of this dependency,
643 : * it's okay to continue with the deletion. This holds when
644 : * recursing from a whole object that includes the nominal
645 : * other end as a component, too. Since there can be more
646 : * than one "owning" object, we have to allow matches that are
647 : * more than one level down in the stack.
648 : */
649 103146 : if (stack_address_present_add_flags(&otherObject, 0, stack))
650 101662 : break;
651 :
652 : /*
653 : * 3. Not all the owning objects have been visited, so
654 : * transform this deletion request into a delete of this
655 : * owning object.
656 : *
657 : * First, release caller's lock on this object and get
658 : * deletion lock on the owning object. (We must release
659 : * caller's lock to avoid deadlock against a concurrent
660 : * deletion of the owning object.)
661 : */
662 1484 : ReleaseDeletionLock(object);
663 1484 : AcquireDeletionLock(&otherObject, 0);
664 :
665 : /*
666 : * The owning object might have been deleted while we waited
667 : * to lock it; if so, neither it nor the current object are
668 : * interesting anymore. We test this by checking the
669 : * pg_depend entry (see notes below).
670 : */
671 1484 : if (!systable_recheck_tuple(scan, tup))
672 : {
673 0 : systable_endscan(scan);
674 0 : ReleaseDeletionLock(&otherObject);
675 0 : return;
676 : }
677 :
678 : /*
679 : * One way or the other, we're done with the scan; might as
680 : * well close it down before recursing, to reduce peak
681 : * resource consumption.
682 : */
683 1484 : systable_endscan(scan);
684 :
685 : /*
686 : * Okay, recurse to the owning object instead of proceeding.
687 : *
688 : * We do not need to stack the current object; we want the
689 : * traversal order to be as if the original reference had
690 : * linked to the owning object instead of this one.
691 : *
692 : * The dependency type is a "reverse" dependency: we need to
693 : * delete the owning object if this one is to be deleted, but
694 : * this linkage is never a reason for an automatic deletion.
695 : */
696 1484 : findDependentObjects(&otherObject,
697 : DEPFLAG_REVERSE,
698 : flags,
699 : stack,
700 : targetObjects,
701 : pendingObjects,
702 : depRel);
703 :
704 : /*
705 : * The current target object should have been added to
706 : * targetObjects while processing the owning object; but it
707 : * probably got only the flag bits associated with the
708 : * dependency we're looking at. We need to add the objflags
709 : * that were passed to this recursion level, too, else we may
710 : * get a bogus failure in reportDependentObjects (if, for
711 : * example, we were called due to a partition dependency).
712 : *
713 : * If somehow the current object didn't get scheduled for
714 : * deletion, bleat. (That would imply that somebody deleted
715 : * this dependency record before the recursion got to it.)
716 : * Another idea would be to reacquire lock on the current
717 : * object and resume trying to delete it, but it seems not
718 : * worth dealing with the race conditions inherent in that.
719 : */
720 1484 : if (!object_address_present_add_flags(object, objflags,
721 : targetObjects))
722 0 : elog(ERROR, "deletion of owning object %s failed to delete %s",
723 : getObjectDescription(&otherObject, false),
724 : getObjectDescription(object, false));
725 :
726 : /* And we're done here. */
727 1484 : return;
728 :
729 5012 : case DEPENDENCY_PARTITION_PRI:
730 :
731 : /*
732 : * Remember that this object has a partition-type dependency.
733 : * After the dependency scan, we'll complain if we didn't find
734 : * a reason to delete one of its partition dependencies.
735 : */
736 5012 : objflags |= DEPFLAG_IS_PART;
737 :
738 : /*
739 : * Also remember the primary partition owner, for error
740 : * messages. If there are multiple primary owners (which
741 : * there should not be), we'll report a random one of them.
742 : */
743 5012 : partitionObject = otherObject;
744 5012 : break;
745 :
746 5012 : case DEPENDENCY_PARTITION_SEC:
747 :
748 : /*
749 : * Only use secondary partition owners in error messages if we
750 : * find no primary owner (which probably shouldn't happen).
751 : */
752 5012 : if (!(objflags & DEPFLAG_IS_PART))
753 0 : partitionObject = otherObject;
754 :
755 : /*
756 : * Remember that this object has a partition-type dependency.
757 : * After the dependency scan, we'll complain if we didn't find
758 : * a reason to delete one of its partition dependencies.
759 : */
760 5012 : objflags |= DEPFLAG_IS_PART;
761 5012 : break;
762 :
763 0 : default:
764 0 : elog(ERROR, "unrecognized dependency type '%c' for %s",
765 : foundDep->deptype, getObjectDescription(object, false));
766 : break;
767 : }
768 : }
769 :
770 189520 : systable_endscan(scan);
771 :
772 : /*
773 : * If we found an INTERNAL or EXTENSION dependency when we're at outer
774 : * level, complain about it now. If we also found a PARTITION dependency,
775 : * we prefer to report the PARTITION dependency. This is arbitrary but
776 : * seems to be more useful in practice.
777 : */
778 189520 : if (OidIsValid(owningObject.classId))
779 : {
780 : char *otherObjDesc;
781 :
782 40 : if (OidIsValid(partitionObject.classId))
783 12 : otherObjDesc = getObjectDescription(&partitionObject, false);
784 : else
785 28 : otherObjDesc = getObjectDescription(&owningObject, false);
786 :
787 40 : ereport(ERROR,
788 : (errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
789 : errmsg("cannot drop %s because %s requires it",
790 : getObjectDescription(object, false), otherObjDesc),
791 : errhint("You can drop %s instead.", otherObjDesc)));
792 : }
793 :
794 : /*
795 : * Next, identify all objects that directly depend on the current object.
796 : * To ensure predictable deletion order, we collect them up in
797 : * dependentObjects and sort the list before actually recursing. (The
798 : * deletion order would be valid in any case, but doing this ensures
799 : * consistent output from DROP CASCADE commands, which is helpful for
800 : * regression testing.)
801 : */
802 189480 : maxDependentObjects = 128; /* arbitrary initial allocation */
803 : dependentObjects = (ObjectAddressAndFlags *)
804 189480 : palloc(maxDependentObjects * sizeof(ObjectAddressAndFlags));
805 189480 : numDependentObjects = 0;
806 :
807 189480 : ScanKeyInit(&key[0],
808 : Anum_pg_depend_refclassid,
809 : BTEqualStrategyNumber, F_OIDEQ,
810 : ObjectIdGetDatum(object->classId));
811 189480 : ScanKeyInit(&key[1],
812 : Anum_pg_depend_refobjid,
813 : BTEqualStrategyNumber, F_OIDEQ,
814 : ObjectIdGetDatum(object->objectId));
815 189480 : if (object->objectSubId != 0)
816 : {
817 2112 : ScanKeyInit(&key[2],
818 : Anum_pg_depend_refobjsubid,
819 : BTEqualStrategyNumber, F_INT4EQ,
820 : Int32GetDatum(object->objectSubId));
821 2112 : nkeys = 3;
822 : }
823 : else
824 187368 : nkeys = 2;
825 :
826 189480 : scan = systable_beginscan(*depRel, DependReferenceIndexId, true,
827 : NULL, nkeys, key);
828 :
829 389876 : while (HeapTupleIsValid(tup = systable_getnext(scan)))
830 : {
831 200396 : Form_pg_depend foundDep = (Form_pg_depend) GETSTRUCT(tup);
832 : int subflags;
833 :
834 200396 : otherObject.classId = foundDep->classid;
835 200396 : otherObject.objectId = foundDep->objid;
836 200396 : otherObject.objectSubId = foundDep->objsubid;
837 :
838 : /*
839 : * If what we found is a sub-object of the current object, just ignore
840 : * it. (Normally, such a dependency is implicit, but we must make
841 : * explicit ones in some cases involving partitioning.)
842 : */
843 200396 : if (otherObject.classId == object->classId &&
844 89678 : otherObject.objectId == object->objectId &&
845 4280 : object->objectSubId == 0)
846 4280 : continue;
847 :
848 : /*
849 : * Must lock the dependent object before recursing to it.
850 : */
851 196116 : AcquireDeletionLock(&otherObject, 0);
852 :
853 : /*
854 : * The dependent object might have been deleted while we waited to
855 : * lock it; if so, we don't need to do anything more with it. We can
856 : * test this cheaply and independently of the object's type by seeing
857 : * if the pg_depend tuple we are looking at is still live. (If the
858 : * object got deleted, the tuple would have been deleted too.)
859 : */
860 196116 : if (!systable_recheck_tuple(scan, tup))
861 : {
862 : /* release the now-useless lock */
863 0 : ReleaseDeletionLock(&otherObject);
864 : /* and continue scanning for dependencies */
865 0 : continue;
866 : }
867 :
868 : /*
869 : * We do need to delete it, so identify objflags to be passed down,
870 : * which depend on the dependency type.
871 : */
872 196116 : switch (foundDep->deptype)
873 : {
874 25412 : case DEPENDENCY_NORMAL:
875 25412 : subflags = DEPFLAG_NORMAL;
876 25412 : break;
877 59888 : case DEPENDENCY_AUTO:
878 : case DEPENDENCY_AUTO_EXTENSION:
879 59888 : subflags = DEPFLAG_AUTO;
880 59888 : break;
881 98822 : case DEPENDENCY_INTERNAL:
882 98822 : subflags = DEPFLAG_INTERNAL;
883 98822 : break;
884 9200 : case DEPENDENCY_PARTITION_PRI:
885 : case DEPENDENCY_PARTITION_SEC:
886 9200 : subflags = DEPFLAG_PARTITION;
887 9200 : break;
888 2794 : case DEPENDENCY_EXTENSION:
889 2794 : subflags = DEPFLAG_EXTENSION;
890 2794 : break;
891 0 : default:
892 0 : elog(ERROR, "unrecognized dependency type '%c' for %s",
893 : foundDep->deptype, getObjectDescription(object, false));
894 : subflags = 0; /* keep compiler quiet */
895 : break;
896 : }
897 :
898 : /* And add it to the pending-objects list */
899 196116 : if (numDependentObjects >= maxDependentObjects)
900 : {
901 : /* enlarge array if needed */
902 8 : maxDependentObjects *= 2;
903 : dependentObjects = (ObjectAddressAndFlags *)
904 8 : repalloc(dependentObjects,
905 : maxDependentObjects * sizeof(ObjectAddressAndFlags));
906 : }
907 :
908 196116 : dependentObjects[numDependentObjects].obj = otherObject;
909 196116 : dependentObjects[numDependentObjects].subflags = subflags;
910 196116 : numDependentObjects++;
911 : }
912 :
913 189480 : systable_endscan(scan);
914 :
915 : /*
916 : * Now we can sort the dependent objects into a stable visitation order.
917 : * It's safe to use object_address_comparator here since the obj field is
918 : * first within ObjectAddressAndFlags.
919 : */
920 189480 : if (numDependentObjects > 1)
921 42020 : qsort(dependentObjects, numDependentObjects,
922 : sizeof(ObjectAddressAndFlags),
923 : object_address_comparator);
924 :
925 : /*
926 : * Now recurse to the dependent objects. We must visit them first since
927 : * they have to be deleted before the current object.
928 : */
929 189480 : mystack.object = object; /* set up a new stack level */
930 189480 : mystack.flags = objflags;
931 189480 : mystack.next = stack;
932 :
933 385596 : for (int i = 0; i < numDependentObjects; i++)
934 : {
935 196116 : ObjectAddressAndFlags *depObj = dependentObjects + i;
936 :
937 196116 : findDependentObjects(&depObj->obj,
938 : depObj->subflags,
939 : flags,
940 : &mystack,
941 : targetObjects,
942 : pendingObjects,
943 : depRel);
944 : }
945 :
946 189480 : pfree(dependentObjects);
947 :
948 : /*
949 : * Finally, we can add the target object to targetObjects. Be careful to
950 : * include any flags that were passed back down to us from inner recursion
951 : * levels. Record the "dependee" as being either the most important
952 : * partition owner if there is one, else the object we recursed from, if
953 : * any. (The logic in reportDependentObjects() is such that it can only
954 : * need one of those objects.)
955 : */
956 189480 : extra.flags = mystack.flags;
957 189480 : if (extra.flags & DEPFLAG_IS_PART)
958 5000 : extra.dependee = partitionObject;
959 184480 : else if (stack)
960 149830 : extra.dependee = *stack->object;
961 : else
962 34650 : memset(&extra.dependee, 0, sizeof(extra.dependee));
963 189480 : add_exact_object_address_extra(object, &extra, targetObjects);
964 : }
965 :
966 : /*
967 : * reportDependentObjects - report about dependencies, and fail if RESTRICT
968 : *
969 : * Tell the user about dependent objects that we are going to delete
970 : * (or would need to delete, but are prevented by RESTRICT mode);
971 : * then error out if there are any and it's not CASCADE mode.
972 : *
973 : * targetObjects: list of objects that are scheduled to be deleted
974 : * behavior: RESTRICT or CASCADE
975 : * flags: other flags for the deletion operation
976 : * origObject: base object of deletion, or NULL if not available
977 : * (the latter case occurs in DROP OWNED)
978 : */
979 : static void
980 30252 : reportDependentObjects(const ObjectAddresses *targetObjects,
981 : DropBehavior behavior,
982 : int flags,
983 : const ObjectAddress *origObject)
984 : {
985 30252 : int msglevel = (flags & PERFORM_DELETION_QUIETLY) ? DEBUG2 : NOTICE;
986 30252 : bool ok = true;
987 : StringInfoData clientdetail;
988 : StringInfoData logdetail;
989 30252 : int numReportedClient = 0;
990 30252 : int numNotReportedClient = 0;
991 : int i;
992 :
993 : /*
994 : * If we need to delete any partition-dependent objects, make sure that
995 : * we're deleting at least one of their partition dependencies, too. That
996 : * can be detected by checking that we reached them by a PARTITION
997 : * dependency at some point.
998 : *
999 : * We just report the first such object, as in most cases the only way to
1000 : * trigger this complaint is to explicitly try to delete one partition of
1001 : * a partitioned object.
1002 : */
1003 219702 : for (i = 0; i < targetObjects->numrefs; i++)
1004 : {
1005 189480 : const ObjectAddressExtra *extra = &targetObjects->extras[i];
1006 :
1007 189480 : if ((extra->flags & DEPFLAG_IS_PART) &&
1008 5000 : !(extra->flags & DEPFLAG_PARTITION))
1009 : {
1010 30 : const ObjectAddress *object = &targetObjects->refs[i];
1011 30 : char *otherObjDesc = getObjectDescription(&extra->dependee,
1012 : false);
1013 :
1014 30 : ereport(ERROR,
1015 : (errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
1016 : errmsg("cannot drop %s because %s requires it",
1017 : getObjectDescription(object, false), otherObjDesc),
1018 : errhint("You can drop %s instead.", otherObjDesc)));
1019 : }
1020 : }
1021 :
1022 : /*
1023 : * If no error is to be thrown, and the msglevel is too low to be shown to
1024 : * either client or server log, there's no need to do any of the rest of
1025 : * the work.
1026 : */
1027 30222 : if (behavior == DROP_CASCADE &&
1028 3242 : !message_level_is_interesting(msglevel))
1029 862 : return;
1030 :
1031 : /*
1032 : * We limit the number of dependencies reported to the client to
1033 : * MAX_REPORTED_DEPS, since client software may not deal well with
1034 : * enormous error strings. The server log always gets a full report.
1035 : */
1036 : #define MAX_REPORTED_DEPS 100
1037 :
1038 29360 : initStringInfo(&clientdetail);
1039 29360 : initStringInfo(&logdetail);
1040 :
1041 : /*
1042 : * We process the list back to front (ie, in dependency order not deletion
1043 : * order), since this makes for a more understandable display.
1044 : */
1045 207762 : for (i = targetObjects->numrefs - 1; i >= 0; i--)
1046 : {
1047 178402 : const ObjectAddress *obj = &targetObjects->refs[i];
1048 178402 : const ObjectAddressExtra *extra = &targetObjects->extras[i];
1049 : char *objDesc;
1050 :
1051 : /* Ignore the original deletion target(s) */
1052 178402 : if (extra->flags & DEPFLAG_ORIGINAL)
1053 34266 : continue;
1054 :
1055 : /* Also ignore sub-objects; we'll report the whole object elsewhere */
1056 144136 : if (extra->flags & DEPFLAG_SUBOBJECT)
1057 0 : continue;
1058 :
1059 144136 : objDesc = getObjectDescription(obj, false);
1060 :
1061 : /* An object being dropped concurrently doesn't need to be reported */
1062 144136 : if (objDesc == NULL)
1063 0 : continue;
1064 :
1065 : /*
1066 : * If, at any stage of the recursive search, we reached the object via
1067 : * an AUTO, INTERNAL, PARTITION, or EXTENSION dependency, then it's
1068 : * okay to delete it even in RESTRICT mode.
1069 : */
1070 144136 : if (extra->flags & (DEPFLAG_AUTO |
1071 : DEPFLAG_INTERNAL |
1072 : DEPFLAG_PARTITION |
1073 : DEPFLAG_EXTENSION))
1074 : {
1075 : /*
1076 : * auto-cascades are reported at DEBUG2, not msglevel. We don't
1077 : * try to combine them with the regular message because the
1078 : * results are too confusing when client_min_messages and
1079 : * log_min_messages are different.
1080 : */
1081 139352 : ereport(DEBUG2,
1082 : (errmsg_internal("drop auto-cascades to %s",
1083 : objDesc)));
1084 : }
1085 4784 : else if (behavior == DROP_RESTRICT)
1086 : {
1087 508 : char *otherDesc = getObjectDescription(&extra->dependee,
1088 : false);
1089 :
1090 508 : if (otherDesc)
1091 : {
1092 508 : if (numReportedClient < MAX_REPORTED_DEPS)
1093 : {
1094 : /* separate entries with a newline */
1095 508 : if (clientdetail.len != 0)
1096 206 : appendStringInfoChar(&clientdetail, '\n');
1097 508 : appendStringInfo(&clientdetail, _("%s depends on %s"),
1098 : objDesc, otherDesc);
1099 508 : numReportedClient++;
1100 : }
1101 : else
1102 0 : numNotReportedClient++;
1103 : /* separate entries with a newline */
1104 508 : if (logdetail.len != 0)
1105 206 : appendStringInfoChar(&logdetail, '\n');
1106 508 : appendStringInfo(&logdetail, _("%s depends on %s"),
1107 : objDesc, otherDesc);
1108 508 : pfree(otherDesc);
1109 : }
1110 : else
1111 0 : numNotReportedClient++;
1112 508 : ok = false;
1113 : }
1114 : else
1115 : {
1116 4276 : if (numReportedClient < MAX_REPORTED_DEPS)
1117 : {
1118 : /* separate entries with a newline */
1119 4276 : if (clientdetail.len != 0)
1120 2910 : appendStringInfoChar(&clientdetail, '\n');
1121 4276 : appendStringInfo(&clientdetail, _("drop cascades to %s"),
1122 : objDesc);
1123 4276 : numReportedClient++;
1124 : }
1125 : else
1126 0 : numNotReportedClient++;
1127 : /* separate entries with a newline */
1128 4276 : if (logdetail.len != 0)
1129 2910 : appendStringInfoChar(&logdetail, '\n');
1130 4276 : appendStringInfo(&logdetail, _("drop cascades to %s"),
1131 : objDesc);
1132 : }
1133 :
1134 144136 : pfree(objDesc);
1135 : }
1136 :
1137 29360 : if (numNotReportedClient > 0)
1138 0 : appendStringInfo(&clientdetail, ngettext("\nand %d other object "
1139 : "(see server log for list)",
1140 : "\nand %d other objects "
1141 : "(see server log for list)",
1142 : numNotReportedClient),
1143 : numNotReportedClient);
1144 :
1145 29360 : if (!ok)
1146 : {
1147 302 : if (origObject)
1148 296 : ereport(ERROR,
1149 : (errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
1150 : errmsg("cannot drop %s because other objects depend on it",
1151 : getObjectDescription(origObject, false)),
1152 : errdetail_internal("%s", clientdetail.data),
1153 : errdetail_log("%s", logdetail.data),
1154 : errhint("Use DROP ... CASCADE to drop the dependent objects too.")));
1155 : else
1156 6 : ereport(ERROR,
1157 : (errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
1158 : errmsg("cannot drop desired object(s) because other objects depend on them"),
1159 : errdetail_internal("%s", clientdetail.data),
1160 : errdetail_log("%s", logdetail.data),
1161 : errhint("Use DROP ... CASCADE to drop the dependent objects too.")));
1162 : }
1163 29058 : else if (numReportedClient > 1)
1164 : {
1165 648 : ereport(msglevel,
1166 : (errmsg_plural("drop cascades to %d other object",
1167 : "drop cascades to %d other objects",
1168 : numReportedClient + numNotReportedClient,
1169 : numReportedClient + numNotReportedClient),
1170 : errdetail_internal("%s", clientdetail.data),
1171 : errdetail_log("%s", logdetail.data)));
1172 : }
1173 28410 : else if (numReportedClient == 1)
1174 : {
1175 : /* we just use the single item as-is */
1176 718 : ereport(msglevel,
1177 : (errmsg_internal("%s", clientdetail.data)));
1178 : }
1179 :
1180 29058 : pfree(clientdetail.data);
1181 29058 : pfree(logdetail.data);
1182 : }
1183 :
1184 : /*
1185 : * Drop an object by OID. Works for most catalogs, if no special processing
1186 : * is needed.
1187 : */
1188 : static void
1189 3204 : DropObjectById(const ObjectAddress *object)
1190 : {
1191 : int cacheId;
1192 : Relation rel;
1193 : HeapTuple tup;
1194 :
1195 3204 : cacheId = get_object_catcache_oid(object->classId);
1196 :
1197 3204 : rel = table_open(object->classId, RowExclusiveLock);
1198 :
1199 : /*
1200 : * Use the system cache for the oid column, if one exists.
1201 : */
1202 3204 : if (cacheId >= 0)
1203 : {
1204 1730 : tup = SearchSysCache1(cacheId, ObjectIdGetDatum(object->objectId));
1205 1730 : if (!HeapTupleIsValid(tup))
1206 0 : elog(ERROR, "cache lookup failed for %s %u",
1207 : get_object_class_descr(object->classId), object->objectId);
1208 :
1209 1730 : CatalogTupleDelete(rel, &tup->t_self);
1210 :
1211 1730 : ReleaseSysCache(tup);
1212 : }
1213 : else
1214 : {
1215 : ScanKeyData skey[1];
1216 : SysScanDesc scan;
1217 :
1218 2948 : ScanKeyInit(&skey[0],
1219 1474 : get_object_attnum_oid(object->classId),
1220 : BTEqualStrategyNumber, F_OIDEQ,
1221 : ObjectIdGetDatum(object->objectId));
1222 :
1223 1474 : scan = systable_beginscan(rel, get_object_oid_index(object->classId), true,
1224 : NULL, 1, skey);
1225 :
1226 : /* we expect exactly one match */
1227 1474 : tup = systable_getnext(scan);
1228 1474 : if (!HeapTupleIsValid(tup))
1229 0 : elog(ERROR, "could not find tuple for %s %u",
1230 : get_object_class_descr(object->classId), object->objectId);
1231 :
1232 1474 : CatalogTupleDelete(rel, &tup->t_self);
1233 :
1234 1474 : systable_endscan(scan);
1235 : }
1236 :
1237 3204 : table_close(rel, RowExclusiveLock);
1238 3204 : }
1239 :
1240 : /*
1241 : * deleteOneObject: delete a single object for performDeletion.
1242 : *
1243 : * *depRel is the already-open pg_depend relation.
1244 : */
1245 : static void
1246 184610 : deleteOneObject(const ObjectAddress *object, Relation *depRel, int flags)
1247 : {
1248 : ScanKeyData key[3];
1249 : int nkeys;
1250 : SysScanDesc scan;
1251 : HeapTuple tup;
1252 :
1253 : /* DROP hook of the objects being removed */
1254 184610 : InvokeObjectDropHookArg(object->classId, object->objectId,
1255 : object->objectSubId, flags);
1256 :
1257 : /*
1258 : * Close depRel if we are doing a drop concurrently. The object deletion
1259 : * subroutine will commit the current transaction, so we can't keep the
1260 : * relation open across doDeletion().
1261 : */
1262 184610 : if (flags & PERFORM_DELETION_CONCURRENTLY)
1263 82 : table_close(*depRel, RowExclusiveLock);
1264 :
1265 : /*
1266 : * Delete the object itself, in an object-type-dependent way.
1267 : *
1268 : * We used to do this after removing the outgoing dependency links, but it
1269 : * seems just as reasonable to do it beforehand. In the concurrent case
1270 : * we *must* do it in this order, because we can't make any transactional
1271 : * updates before calling doDeletion() --- they'd get committed right
1272 : * away, which is not cool if the deletion then fails.
1273 : */
1274 184610 : doDeletion(object, flags);
1275 :
1276 : /*
1277 : * Reopen depRel if we closed it above
1278 : */
1279 184606 : if (flags & PERFORM_DELETION_CONCURRENTLY)
1280 82 : *depRel = table_open(DependRelationId, RowExclusiveLock);
1281 :
1282 : /*
1283 : * Now remove any pg_depend records that link from this object to others.
1284 : * (Any records linking to this object should be gone already.)
1285 : *
1286 : * When dropping a whole object (subId = 0), remove all pg_depend records
1287 : * for its sub-objects too.
1288 : */
1289 184606 : ScanKeyInit(&key[0],
1290 : Anum_pg_depend_classid,
1291 : BTEqualStrategyNumber, F_OIDEQ,
1292 : ObjectIdGetDatum(object->classId));
1293 184606 : ScanKeyInit(&key[1],
1294 : Anum_pg_depend_objid,
1295 : BTEqualStrategyNumber, F_OIDEQ,
1296 : ObjectIdGetDatum(object->objectId));
1297 184606 : if (object->objectSubId != 0)
1298 : {
1299 2028 : ScanKeyInit(&key[2],
1300 : Anum_pg_depend_objsubid,
1301 : BTEqualStrategyNumber, F_INT4EQ,
1302 : Int32GetDatum(object->objectSubId));
1303 2028 : nkeys = 3;
1304 : }
1305 : else
1306 182578 : nkeys = 2;
1307 :
1308 184606 : scan = systable_beginscan(*depRel, DependDependerIndexId, true,
1309 : NULL, nkeys, key);
1310 :
1311 442168 : while (HeapTupleIsValid(tup = systable_getnext(scan)))
1312 : {
1313 257562 : CatalogTupleDelete(*depRel, &tup->t_self);
1314 : }
1315 :
1316 184606 : systable_endscan(scan);
1317 :
1318 : /*
1319 : * Delete shared dependency references related to this object. Again, if
1320 : * subId = 0, remove records for sub-objects too.
1321 : */
1322 184606 : deleteSharedDependencyRecordsFor(object->classId, object->objectId,
1323 : object->objectSubId);
1324 :
1325 :
1326 : /*
1327 : * Delete any comments, security labels, or initial privileges associated
1328 : * with this object. (This is a convenient place to do these things,
1329 : * rather than having every object type know to do it.)
1330 : */
1331 184606 : DeleteComments(object->objectId, object->classId, object->objectSubId);
1332 184606 : DeleteSecurityLabel(object);
1333 184606 : DeleteInitPrivs(object);
1334 :
1335 : /*
1336 : * CommandCounterIncrement here to ensure that preceding changes are all
1337 : * visible to the next deletion step.
1338 : */
1339 184606 : CommandCounterIncrement();
1340 :
1341 : /*
1342 : * And we're done!
1343 : */
1344 184606 : }
1345 :
1346 : /*
1347 : * doDeletion: actually delete a single object
1348 : */
1349 : static void
1350 184610 : doDeletion(const ObjectAddress *object, int flags)
1351 : {
1352 184610 : switch (object->classId)
1353 : {
1354 67202 : case RelationRelationId:
1355 : {
1356 67202 : char relKind = get_rel_relkind(object->objectId);
1357 :
1358 67202 : if (relKind == RELKIND_INDEX ||
1359 : relKind == RELKIND_PARTITIONED_INDEX)
1360 22840 : {
1361 22840 : bool concurrent = ((flags & PERFORM_DELETION_CONCURRENTLY) != 0);
1362 22840 : bool concurrent_lock_mode = ((flags & PERFORM_DELETION_CONCURRENT_LOCK) != 0);
1363 :
1364 : Assert(object->objectSubId == 0);
1365 22840 : index_drop(object->objectId, concurrent, concurrent_lock_mode);
1366 : }
1367 : else
1368 : {
1369 44362 : if (object->objectSubId != 0)
1370 2028 : RemoveAttributeById(object->objectId,
1371 2028 : object->objectSubId);
1372 : else
1373 42334 : heap_drop_with_catalog(object->objectId);
1374 : }
1375 :
1376 : /*
1377 : * for a sequence, in addition to dropping the heap, also
1378 : * delete pg_sequence tuple
1379 : */
1380 67202 : if (relKind == RELKIND_SEQUENCE)
1381 928 : DeleteSequenceTuple(object->objectId);
1382 67202 : break;
1383 : }
1384 :
1385 6434 : case ProcedureRelationId:
1386 6434 : RemoveFunctionById(object->objectId);
1387 6434 : break;
1388 :
1389 66114 : case TypeRelationId:
1390 66114 : RemoveTypeById(object->objectId);
1391 66114 : break;
1392 :
1393 19956 : case ConstraintRelationId:
1394 19956 : RemoveConstraintById(object->objectId);
1395 19954 : break;
1396 :
1397 2976 : case AttrDefaultRelationId:
1398 2976 : RemoveAttrDefaultById(object->objectId);
1399 2976 : break;
1400 :
1401 88 : case LargeObjectRelationId:
1402 88 : LargeObjectDrop(object->objectId);
1403 88 : break;
1404 :
1405 734 : case OperatorRelationId:
1406 734 : RemoveOperatorById(object->objectId);
1407 734 : break;
1408 :
1409 2764 : case RewriteRelationId:
1410 2764 : RemoveRewriteRuleById(object->objectId);
1411 2762 : break;
1412 :
1413 12668 : case TriggerRelationId:
1414 12668 : RemoveTriggerById(object->objectId);
1415 12668 : break;
1416 :
1417 454 : case StatisticExtRelationId:
1418 454 : RemoveStatisticsById(object->objectId);
1419 454 : break;
1420 :
1421 48 : case TSConfigRelationId:
1422 48 : RemoveTSConfigurationById(object->objectId);
1423 48 : break;
1424 :
1425 106 : case ExtensionRelationId:
1426 106 : RemoveExtensionById(object->objectId);
1427 106 : break;
1428 :
1429 540 : case PolicyRelationId:
1430 540 : RemovePolicyById(object->objectId);
1431 540 : break;
1432 :
1433 192 : case PublicationNamespaceRelationId:
1434 192 : RemovePublicationSchemaById(object->objectId);
1435 192 : break;
1436 :
1437 760 : case PublicationRelRelationId:
1438 760 : RemovePublicationRelById(object->objectId);
1439 760 : break;
1440 :
1441 370 : case PublicationRelationId:
1442 370 : RemovePublicationById(object->objectId);
1443 370 : break;
1444 :
1445 3204 : case CastRelationId:
1446 : case CollationRelationId:
1447 : case ConversionRelationId:
1448 : case LanguageRelationId:
1449 : case OperatorClassRelationId:
1450 : case OperatorFamilyRelationId:
1451 : case AccessMethodRelationId:
1452 : case AccessMethodOperatorRelationId:
1453 : case AccessMethodProcedureRelationId:
1454 : case NamespaceRelationId:
1455 : case TSParserRelationId:
1456 : case TSDictionaryRelationId:
1457 : case TSTemplateRelationId:
1458 : case ForeignDataWrapperRelationId:
1459 : case ForeignServerRelationId:
1460 : case UserMappingRelationId:
1461 : case DefaultAclRelationId:
1462 : case EventTriggerRelationId:
1463 : case TransformRelationId:
1464 : case AuthMemRelationId:
1465 3204 : DropObjectById(object);
1466 3204 : break;
1467 :
1468 : /*
1469 : * These global object types are not supported here.
1470 : */
1471 0 : case AuthIdRelationId:
1472 : case DatabaseRelationId:
1473 : case TableSpaceRelationId:
1474 : case SubscriptionRelationId:
1475 : case ParameterAclRelationId:
1476 0 : elog(ERROR, "global objects cannot be deleted by doDeletion");
1477 : break;
1478 :
1479 0 : default:
1480 0 : elog(ERROR, "unsupported object class: %u", object->classId);
1481 : }
1482 184606 : }
1483 :
1484 : /*
1485 : * AcquireDeletionLock - acquire a suitable lock for deleting an object
1486 : *
1487 : * Accepts the same flags as performDeletion (though currently only
1488 : * PERFORM_DELETION_CONCURRENTLY does anything).
1489 : *
1490 : * We use LockRelation for relations, and otherwise LockSharedObject or
1491 : * LockDatabaseObject as appropriate for the object type.
1492 : */
1493 : void
1494 233208 : AcquireDeletionLock(const ObjectAddress *object, int flags)
1495 : {
1496 233208 : if (object->classId == RelationRelationId)
1497 : {
1498 : /*
1499 : * In DROP INDEX CONCURRENTLY, take only ShareUpdateExclusiveLock on
1500 : * the index for the moment. index_drop() will promote the lock once
1501 : * it's safe to do so. In all other cases we need full exclusive
1502 : * lock.
1503 : */
1504 85642 : if (flags & PERFORM_DELETION_CONCURRENTLY)
1505 82 : LockRelationOid(object->objectId, ShareUpdateExclusiveLock);
1506 : else
1507 85560 : LockRelationOid(object->objectId, AccessExclusiveLock);
1508 : }
1509 147566 : else if (object->classId == AuthMemRelationId)
1510 12 : LockSharedObject(object->classId, object->objectId, 0,
1511 : AccessExclusiveLock);
1512 : else
1513 : {
1514 : /* assume we should lock the whole object not a sub-object */
1515 147554 : LockDatabaseObject(object->classId, object->objectId, 0,
1516 : AccessExclusiveLock);
1517 : }
1518 233208 : }
1519 :
1520 : /*
1521 : * ReleaseDeletionLock - release an object deletion lock
1522 : *
1523 : * Companion to AcquireDeletionLock.
1524 : */
1525 : void
1526 1484 : ReleaseDeletionLock(const ObjectAddress *object)
1527 : {
1528 1484 : if (object->classId == RelationRelationId)
1529 44 : UnlockRelationOid(object->objectId, AccessExclusiveLock);
1530 : else
1531 : /* assume we should lock the whole object not a sub-object */
1532 1440 : UnlockDatabaseObject(object->classId, object->objectId, 0,
1533 : AccessExclusiveLock);
1534 1484 : }
1535 :
1536 : /*
1537 : * recordDependencyOnExpr - find expression dependencies
1538 : *
1539 : * This is used to find the dependencies of rules, constraint expressions,
1540 : * etc.
1541 : *
1542 : * Given an expression or query in node-tree form, find all the objects
1543 : * it refers to (tables, columns, operators, functions, etc). Record
1544 : * a dependency of the specified type from the given depender object
1545 : * to each object mentioned in the expression.
1546 : *
1547 : * rtable is the rangetable to be used to interpret Vars with varlevelsup=0.
1548 : * It can be NIL if no such variables are expected.
1549 : */
1550 : void
1551 24136 : recordDependencyOnExpr(const ObjectAddress *depender,
1552 : Node *expr, List *rtable,
1553 : DependencyType behavior)
1554 : {
1555 : find_expr_references_context context;
1556 :
1557 24136 : context.addrs = new_object_addresses();
1558 :
1559 : /* Set up interpretation for Vars at varlevelsup = 0 */
1560 24136 : context.rtables = list_make1(rtable);
1561 :
1562 : /* Scan the expression tree for referenceable objects */
1563 24136 : find_expr_references_walker(expr, &context);
1564 :
1565 : /* Remove any duplicates */
1566 24136 : eliminate_duplicate_dependencies(context.addrs);
1567 :
1568 : /* And record 'em */
1569 24136 : recordMultipleDependencies(depender,
1570 24136 : context.addrs->refs, context.addrs->numrefs,
1571 : behavior);
1572 :
1573 24136 : free_object_addresses(context.addrs);
1574 24136 : }
1575 :
1576 : /*
1577 : * recordDependencyOnSingleRelExpr - find expression dependencies
1578 : *
1579 : * As above, but only one relation is expected to be referenced (with
1580 : * varno = 1 and varlevelsup = 0). Pass the relation OID instead of a
1581 : * range table. An additional frammish is that dependencies on that
1582 : * relation's component columns will be marked with 'self_behavior',
1583 : * whereas 'behavior' is used for everything else; also, if 'reverse_self'
1584 : * is true, those dependencies are reversed so that the columns are made
1585 : * to depend on the table not vice versa.
1586 : *
1587 : * NOTE: the caller should ensure that a whole-table dependency on the
1588 : * specified relation is created separately, if one is needed. In particular,
1589 : * a whole-row Var "relation.*" will not cause this routine to emit any
1590 : * dependency item. This is appropriate behavior for subexpressions of an
1591 : * ordinary query, so other cases need to cope as necessary.
1592 : */
1593 : void
1594 8562 : recordDependencyOnSingleRelExpr(const ObjectAddress *depender,
1595 : Node *expr, Oid relId,
1596 : DependencyType behavior,
1597 : DependencyType self_behavior,
1598 : bool reverse_self)
1599 : {
1600 : find_expr_references_context context;
1601 8562 : RangeTblEntry rte = {0};
1602 :
1603 8562 : context.addrs = new_object_addresses();
1604 :
1605 : /* We gin up a rather bogus rangetable list to handle Vars */
1606 8562 : rte.type = T_RangeTblEntry;
1607 8562 : rte.rtekind = RTE_RELATION;
1608 8562 : rte.relid = relId;
1609 8562 : rte.relkind = RELKIND_RELATION; /* no need for exactness here */
1610 8562 : rte.rellockmode = AccessShareLock;
1611 :
1612 8562 : context.rtables = list_make1(list_make1(&rte));
1613 :
1614 : /* Scan the expression tree for referenceable objects */
1615 8562 : find_expr_references_walker(expr, &context);
1616 :
1617 : /* Remove any duplicates */
1618 8562 : eliminate_duplicate_dependencies(context.addrs);
1619 :
1620 : /* Separate self-dependencies if necessary */
1621 8562 : if ((behavior != self_behavior || reverse_self) &&
1622 1652 : context.addrs->numrefs > 0)
1623 : {
1624 : ObjectAddresses *self_addrs;
1625 : ObjectAddress *outobj;
1626 : int oldref,
1627 : outrefs;
1628 :
1629 1646 : self_addrs = new_object_addresses();
1630 :
1631 1646 : outobj = context.addrs->refs;
1632 1646 : outrefs = 0;
1633 6844 : for (oldref = 0; oldref < context.addrs->numrefs; oldref++)
1634 : {
1635 5198 : ObjectAddress *thisobj = context.addrs->refs + oldref;
1636 :
1637 5198 : if (thisobj->classId == RelationRelationId &&
1638 2070 : thisobj->objectId == relId)
1639 : {
1640 : /* Move this ref into self_addrs */
1641 2070 : add_exact_object_address(thisobj, self_addrs);
1642 : }
1643 : else
1644 : {
1645 : /* Keep it in context.addrs */
1646 3128 : *outobj = *thisobj;
1647 3128 : outobj++;
1648 3128 : outrefs++;
1649 : }
1650 : }
1651 1646 : context.addrs->numrefs = outrefs;
1652 :
1653 : /* Record the self-dependencies with the appropriate direction */
1654 1646 : if (!reverse_self)
1655 1438 : recordMultipleDependencies(depender,
1656 1438 : self_addrs->refs, self_addrs->numrefs,
1657 : self_behavior);
1658 : else
1659 : {
1660 : /* Can't use recordMultipleDependencies, so do it the hard way */
1661 : int selfref;
1662 :
1663 498 : for (selfref = 0; selfref < self_addrs->numrefs; selfref++)
1664 : {
1665 290 : ObjectAddress *thisobj = self_addrs->refs + selfref;
1666 :
1667 290 : recordDependencyOn(thisobj, depender, self_behavior);
1668 : }
1669 : }
1670 :
1671 1646 : free_object_addresses(self_addrs);
1672 : }
1673 :
1674 : /* Record the external dependencies */
1675 8562 : recordMultipleDependencies(depender,
1676 8562 : context.addrs->refs, context.addrs->numrefs,
1677 : behavior);
1678 :
1679 8562 : free_object_addresses(context.addrs);
1680 8562 : }
1681 :
1682 : /*
1683 : * Recursively search an expression tree for object references.
1684 : *
1685 : * Note: in many cases we do not need to create dependencies on the datatypes
1686 : * involved in an expression, because we'll have an indirect dependency via
1687 : * some other object. For instance Var nodes depend on a column which depends
1688 : * on the datatype, and OpExpr nodes depend on the operator which depends on
1689 : * the datatype. However we do need a type dependency if there is no such
1690 : * indirect dependency, as for example in Const and CoerceToDomain nodes.
1691 : *
1692 : * Similarly, we don't need to create dependencies on collations except where
1693 : * the collation is being freshly introduced to the expression.
1694 : */
1695 : static bool
1696 1608664 : find_expr_references_walker(Node *node,
1697 : find_expr_references_context *context)
1698 : {
1699 1608664 : if (node == NULL)
1700 560118 : return false;
1701 1048546 : if (IsA(node, Var))
1702 : {
1703 255286 : Var *var = (Var *) node;
1704 : List *rtable;
1705 : RangeTblEntry *rte;
1706 :
1707 : /* Find matching rtable entry, or complain if not found */
1708 255286 : if (var->varlevelsup >= list_length(context->rtables))
1709 0 : elog(ERROR, "invalid varlevelsup %d", var->varlevelsup);
1710 255286 : rtable = (List *) list_nth(context->rtables, var->varlevelsup);
1711 255286 : if (var->varno <= 0 || var->varno > list_length(rtable))
1712 0 : elog(ERROR, "invalid varno %d", var->varno);
1713 255286 : rte = rt_fetch(var->varno, rtable);
1714 :
1715 : /*
1716 : * A whole-row Var references no specific columns, so adds no new
1717 : * dependency. (We assume that there is a whole-table dependency
1718 : * arising from each underlying rangetable entry. While we could
1719 : * record such a dependency when finding a whole-row Var that
1720 : * references a relation directly, it's quite unclear how to extend
1721 : * that to whole-row Vars for JOINs, so it seems better to leave the
1722 : * responsibility with the range table. Note that this poses some
1723 : * risks for identifying dependencies of stand-alone expressions:
1724 : * whole-table references may need to be created separately.)
1725 : */
1726 255286 : if (var->varattno == InvalidAttrNumber)
1727 4414 : return false;
1728 250872 : if (rte->rtekind == RTE_RELATION)
1729 : {
1730 : /* If it's a plain relation, reference this column */
1731 186870 : add_object_address(RelationRelationId, rte->relid, var->varattno,
1732 : context->addrs);
1733 : }
1734 64002 : else if (rte->rtekind == RTE_FUNCTION)
1735 : {
1736 : /* Might need to add a dependency on a composite type's column */
1737 : /* (done out of line, because it's a bit bulky) */
1738 32712 : process_function_rte_ref(rte, var->varattno, context);
1739 : }
1740 :
1741 : /*
1742 : * Vars referencing other RTE types require no additional work. In
1743 : * particular, a join alias Var can be ignored, because it must
1744 : * reference a merged USING column. The relevant join input columns
1745 : * will also be referenced in the join qual, and any type coercion
1746 : * functions involved in the alias expression will be dealt with when
1747 : * we scan the RTE itself.
1748 : */
1749 250872 : return false;
1750 : }
1751 793260 : else if (IsA(node, Const))
1752 : {
1753 131292 : Const *con = (Const *) node;
1754 : Oid objoid;
1755 :
1756 : /* A constant must depend on the constant's datatype */
1757 131292 : add_object_address(TypeRelationId, con->consttype, 0,
1758 : context->addrs);
1759 :
1760 : /*
1761 : * We must also depend on the constant's collation: it could be
1762 : * different from the datatype's, if a CollateExpr was const-folded to
1763 : * a simple constant. However we can save work in the most common
1764 : * case where the collation is "default", since we know that's pinned.
1765 : */
1766 131292 : if (OidIsValid(con->constcollid) &&
1767 50836 : con->constcollid != DEFAULT_COLLATION_OID)
1768 12486 : add_object_address(CollationRelationId, con->constcollid, 0,
1769 : context->addrs);
1770 :
1771 : /*
1772 : * If it's a regclass or similar literal referring to an existing
1773 : * object, add a reference to that object. (Currently, only the
1774 : * regclass and regconfig cases have any likely use, but we may as
1775 : * well handle all the OID-alias datatypes consistently.)
1776 : */
1777 131292 : if (!con->constisnull)
1778 : {
1779 111606 : switch (con->consttype)
1780 : {
1781 0 : case REGPROCOID:
1782 : case REGPROCEDUREOID:
1783 0 : objoid = DatumGetObjectId(con->constvalue);
1784 0 : if (SearchSysCacheExists1(PROCOID,
1785 : ObjectIdGetDatum(objoid)))
1786 0 : add_object_address(ProcedureRelationId, objoid, 0,
1787 : context->addrs);
1788 0 : break;
1789 0 : case REGOPEROID:
1790 : case REGOPERATOROID:
1791 0 : objoid = DatumGetObjectId(con->constvalue);
1792 0 : if (SearchSysCacheExists1(OPEROID,
1793 : ObjectIdGetDatum(objoid)))
1794 0 : add_object_address(OperatorRelationId, objoid, 0,
1795 : context->addrs);
1796 0 : break;
1797 3692 : case REGCLASSOID:
1798 3692 : objoid = DatumGetObjectId(con->constvalue);
1799 3692 : if (SearchSysCacheExists1(RELOID,
1800 : ObjectIdGetDatum(objoid)))
1801 3692 : add_object_address(RelationRelationId, objoid, 0,
1802 : context->addrs);
1803 3692 : break;
1804 0 : case REGTYPEOID:
1805 0 : objoid = DatumGetObjectId(con->constvalue);
1806 0 : if (SearchSysCacheExists1(TYPEOID,
1807 : ObjectIdGetDatum(objoid)))
1808 0 : add_object_address(TypeRelationId, objoid, 0,
1809 : context->addrs);
1810 0 : break;
1811 0 : case REGCOLLATIONOID:
1812 0 : objoid = DatumGetObjectId(con->constvalue);
1813 0 : if (SearchSysCacheExists1(COLLOID,
1814 : ObjectIdGetDatum(objoid)))
1815 0 : add_object_address(CollationRelationId, objoid, 0,
1816 : context->addrs);
1817 0 : break;
1818 0 : case REGCONFIGOID:
1819 0 : objoid = DatumGetObjectId(con->constvalue);
1820 0 : if (SearchSysCacheExists1(TSCONFIGOID,
1821 : ObjectIdGetDatum(objoid)))
1822 0 : add_object_address(TSConfigRelationId, objoid, 0,
1823 : context->addrs);
1824 0 : break;
1825 0 : case REGDICTIONARYOID:
1826 0 : objoid = DatumGetObjectId(con->constvalue);
1827 0 : if (SearchSysCacheExists1(TSDICTOID,
1828 : ObjectIdGetDatum(objoid)))
1829 0 : add_object_address(TSDictionaryRelationId, objoid, 0,
1830 : context->addrs);
1831 0 : break;
1832 :
1833 152 : case REGNAMESPACEOID:
1834 152 : objoid = DatumGetObjectId(con->constvalue);
1835 152 : if (SearchSysCacheExists1(NAMESPACEOID,
1836 : ObjectIdGetDatum(objoid)))
1837 152 : add_object_address(NamespaceRelationId, objoid, 0,
1838 : context->addrs);
1839 152 : break;
1840 :
1841 : /*
1842 : * Dependencies for regrole should be shared among all
1843 : * databases, so explicitly inhibit to have dependencies.
1844 : */
1845 0 : case REGROLEOID:
1846 0 : ereport(ERROR,
1847 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1848 : errmsg("constant of the type %s cannot be used here",
1849 : "regrole")));
1850 : break;
1851 : }
1852 19686 : }
1853 131292 : return false;
1854 : }
1855 661968 : else if (IsA(node, Param))
1856 : {
1857 12598 : Param *param = (Param *) node;
1858 :
1859 : /* A parameter must depend on the parameter's datatype */
1860 12598 : add_object_address(TypeRelationId, param->paramtype, 0,
1861 : context->addrs);
1862 : /* and its collation, just as for Consts */
1863 12598 : if (OidIsValid(param->paramcollid) &&
1864 2096 : param->paramcollid != DEFAULT_COLLATION_OID)
1865 1216 : add_object_address(CollationRelationId, param->paramcollid, 0,
1866 : context->addrs);
1867 : }
1868 649370 : else if (IsA(node, FuncExpr))
1869 : {
1870 63888 : FuncExpr *funcexpr = (FuncExpr *) node;
1871 :
1872 63888 : add_object_address(ProcedureRelationId, funcexpr->funcid, 0,
1873 : context->addrs);
1874 : /* fall through to examine arguments */
1875 : }
1876 585482 : else if (IsA(node, OpExpr))
1877 : {
1878 74024 : OpExpr *opexpr = (OpExpr *) node;
1879 :
1880 74024 : add_object_address(OperatorRelationId, opexpr->opno, 0,
1881 : context->addrs);
1882 : /* fall through to examine arguments */
1883 : }
1884 511458 : else if (IsA(node, DistinctExpr))
1885 : {
1886 12 : DistinctExpr *distinctexpr = (DistinctExpr *) node;
1887 :
1888 12 : add_object_address(OperatorRelationId, distinctexpr->opno, 0,
1889 : context->addrs);
1890 : /* fall through to examine arguments */
1891 : }
1892 511446 : else if (IsA(node, NullIfExpr))
1893 : {
1894 104 : NullIfExpr *nullifexpr = (NullIfExpr *) node;
1895 :
1896 104 : add_object_address(OperatorRelationId, nullifexpr->opno, 0,
1897 : context->addrs);
1898 : /* fall through to examine arguments */
1899 : }
1900 511342 : else if (IsA(node, ScalarArrayOpExpr))
1901 : {
1902 5322 : ScalarArrayOpExpr *opexpr = (ScalarArrayOpExpr *) node;
1903 :
1904 5322 : add_object_address(OperatorRelationId, opexpr->opno, 0,
1905 : context->addrs);
1906 : /* fall through to examine arguments */
1907 : }
1908 506020 : else if (IsA(node, Aggref))
1909 : {
1910 1478 : Aggref *aggref = (Aggref *) node;
1911 :
1912 1478 : add_object_address(ProcedureRelationId, aggref->aggfnoid, 0,
1913 : context->addrs);
1914 : /* fall through to examine arguments */
1915 : }
1916 504542 : else if (IsA(node, WindowFunc))
1917 : {
1918 136 : WindowFunc *wfunc = (WindowFunc *) node;
1919 :
1920 136 : add_object_address(ProcedureRelationId, wfunc->winfnoid, 0,
1921 : context->addrs);
1922 : /* fall through to examine arguments */
1923 : }
1924 504406 : else if (IsA(node, SubscriptingRef))
1925 : {
1926 2138 : SubscriptingRef *sbsref = (SubscriptingRef *) node;
1927 :
1928 : /*
1929 : * The refexpr should provide adequate dependency on refcontainertype,
1930 : * and that type in turn depends on refelemtype. However, a custom
1931 : * subscripting handler might set refrestype to something different
1932 : * from either of those, in which case we'd better record it.
1933 : */
1934 2138 : if (sbsref->refrestype != sbsref->refcontainertype &&
1935 2012 : sbsref->refrestype != sbsref->refelemtype)
1936 0 : add_object_address(TypeRelationId, sbsref->refrestype, 0,
1937 : context->addrs);
1938 : /* fall through to examine arguments */
1939 : }
1940 502268 : else if (IsA(node, SubPlan))
1941 : {
1942 : /* Extra work needed here if we ever need this case */
1943 0 : elog(ERROR, "already-planned subqueries not supported");
1944 : }
1945 502268 : else if (IsA(node, FieldSelect))
1946 : {
1947 11008 : FieldSelect *fselect = (FieldSelect *) node;
1948 11008 : Oid argtype = getBaseType(exprType((Node *) fselect->arg));
1949 11008 : Oid reltype = get_typ_typrelid(argtype);
1950 :
1951 : /*
1952 : * We need a dependency on the specific column named in FieldSelect,
1953 : * assuming we can identify the pg_class OID for it. (Probably we
1954 : * always can at the moment, but in future it might be possible for
1955 : * argtype to be RECORDOID.) If we can make a column dependency then
1956 : * we shouldn't need a dependency on the column's type; but if we
1957 : * can't, make a dependency on the type, as it might not appear
1958 : * anywhere else in the expression.
1959 : */
1960 11008 : if (OidIsValid(reltype))
1961 6184 : add_object_address(RelationRelationId, reltype, fselect->fieldnum,
1962 : context->addrs);
1963 : else
1964 4824 : add_object_address(TypeRelationId, fselect->resulttype, 0,
1965 : context->addrs);
1966 : /* the collation might not be referenced anywhere else, either */
1967 11008 : if (OidIsValid(fselect->resultcollid) &&
1968 1314 : fselect->resultcollid != DEFAULT_COLLATION_OID)
1969 0 : add_object_address(CollationRelationId, fselect->resultcollid, 0,
1970 : context->addrs);
1971 : }
1972 491260 : else if (IsA(node, FieldStore))
1973 : {
1974 96 : FieldStore *fstore = (FieldStore *) node;
1975 96 : Oid reltype = get_typ_typrelid(fstore->resulttype);
1976 :
1977 : /* similar considerations to FieldSelect, but multiple column(s) */
1978 96 : if (OidIsValid(reltype))
1979 : {
1980 : ListCell *l;
1981 :
1982 192 : foreach(l, fstore->fieldnums)
1983 96 : add_object_address(RelationRelationId, reltype, lfirst_int(l),
1984 : context->addrs);
1985 : }
1986 : else
1987 0 : add_object_address(TypeRelationId, fstore->resulttype, 0,
1988 : context->addrs);
1989 : }
1990 491164 : else if (IsA(node, RelabelType))
1991 : {
1992 11076 : RelabelType *relab = (RelabelType *) node;
1993 :
1994 : /* since there is no function dependency, need to depend on type */
1995 11076 : add_object_address(TypeRelationId, relab->resulttype, 0,
1996 : context->addrs);
1997 : /* the collation might not be referenced anywhere else, either */
1998 11076 : if (OidIsValid(relab->resultcollid) &&
1999 2538 : relab->resultcollid != DEFAULT_COLLATION_OID)
2000 2204 : add_object_address(CollationRelationId, relab->resultcollid, 0,
2001 : context->addrs);
2002 : }
2003 480088 : else if (IsA(node, CoerceViaIO))
2004 : {
2005 2128 : CoerceViaIO *iocoerce = (CoerceViaIO *) node;
2006 :
2007 : /* since there is no exposed function, need to depend on type */
2008 2128 : add_object_address(TypeRelationId, iocoerce->resulttype, 0,
2009 : context->addrs);
2010 : /* the collation might not be referenced anywhere else, either */
2011 2128 : if (OidIsValid(iocoerce->resultcollid) &&
2012 1676 : iocoerce->resultcollid != DEFAULT_COLLATION_OID)
2013 532 : add_object_address(CollationRelationId, iocoerce->resultcollid, 0,
2014 : context->addrs);
2015 : }
2016 477960 : else if (IsA(node, ArrayCoerceExpr))
2017 : {
2018 386 : ArrayCoerceExpr *acoerce = (ArrayCoerceExpr *) node;
2019 :
2020 : /* as above, depend on type */
2021 386 : add_object_address(TypeRelationId, acoerce->resulttype, 0,
2022 : context->addrs);
2023 : /* the collation might not be referenced anywhere else, either */
2024 386 : if (OidIsValid(acoerce->resultcollid) &&
2025 158 : acoerce->resultcollid != DEFAULT_COLLATION_OID)
2026 76 : add_object_address(CollationRelationId, acoerce->resultcollid, 0,
2027 : context->addrs);
2028 : /* fall through to examine arguments */
2029 : }
2030 477574 : else if (IsA(node, ConvertRowtypeExpr))
2031 : {
2032 0 : ConvertRowtypeExpr *cvt = (ConvertRowtypeExpr *) node;
2033 :
2034 : /* since there is no function dependency, need to depend on type */
2035 0 : add_object_address(TypeRelationId, cvt->resulttype, 0,
2036 : context->addrs);
2037 : }
2038 477574 : else if (IsA(node, CollateExpr))
2039 : {
2040 84 : CollateExpr *coll = (CollateExpr *) node;
2041 :
2042 84 : add_object_address(CollationRelationId, coll->collOid, 0,
2043 : context->addrs);
2044 : }
2045 477490 : else if (IsA(node, RowExpr))
2046 : {
2047 60 : RowExpr *rowexpr = (RowExpr *) node;
2048 :
2049 60 : add_object_address(TypeRelationId, rowexpr->row_typeid, 0,
2050 : context->addrs);
2051 : }
2052 477430 : else if (IsA(node, RowCompareExpr))
2053 : {
2054 18 : RowCompareExpr *rcexpr = (RowCompareExpr *) node;
2055 : ListCell *l;
2056 :
2057 54 : foreach(l, rcexpr->opnos)
2058 : {
2059 36 : add_object_address(OperatorRelationId, lfirst_oid(l), 0,
2060 : context->addrs);
2061 : }
2062 54 : foreach(l, rcexpr->opfamilies)
2063 : {
2064 36 : add_object_address(OperatorFamilyRelationId, lfirst_oid(l), 0,
2065 : context->addrs);
2066 : }
2067 : /* fall through to examine arguments */
2068 : }
2069 477412 : else if (IsA(node, CoerceToDomain))
2070 : {
2071 48068 : CoerceToDomain *cd = (CoerceToDomain *) node;
2072 :
2073 48068 : add_object_address(TypeRelationId, cd->resulttype, 0,
2074 : context->addrs);
2075 : }
2076 429344 : else if (IsA(node, NextValueExpr))
2077 : {
2078 0 : NextValueExpr *nve = (NextValueExpr *) node;
2079 :
2080 0 : add_object_address(RelationRelationId, nve->seqid, 0,
2081 : context->addrs);
2082 : }
2083 429344 : else if (IsA(node, OnConflictExpr))
2084 : {
2085 18 : OnConflictExpr *onconflict = (OnConflictExpr *) node;
2086 :
2087 18 : if (OidIsValid(onconflict->constraint))
2088 0 : add_object_address(ConstraintRelationId, onconflict->constraint, 0,
2089 : context->addrs);
2090 : /* fall through to examine arguments */
2091 : }
2092 429326 : else if (IsA(node, SortGroupClause))
2093 : {
2094 9846 : SortGroupClause *sgc = (SortGroupClause *) node;
2095 :
2096 9846 : add_object_address(OperatorRelationId, sgc->eqop, 0,
2097 : context->addrs);
2098 9846 : if (OidIsValid(sgc->sortop))
2099 9846 : add_object_address(OperatorRelationId, sgc->sortop, 0,
2100 : context->addrs);
2101 9846 : return false;
2102 : }
2103 419480 : else if (IsA(node, WindowClause))
2104 : {
2105 136 : WindowClause *wc = (WindowClause *) node;
2106 :
2107 136 : if (OidIsValid(wc->startInRangeFunc))
2108 6 : add_object_address(ProcedureRelationId, wc->startInRangeFunc, 0,
2109 : context->addrs);
2110 136 : if (OidIsValid(wc->endInRangeFunc))
2111 6 : add_object_address(ProcedureRelationId, wc->endInRangeFunc, 0,
2112 : context->addrs);
2113 136 : if (OidIsValid(wc->inRangeColl) &&
2114 0 : wc->inRangeColl != DEFAULT_COLLATION_OID)
2115 0 : add_object_address(CollationRelationId, wc->inRangeColl, 0,
2116 : context->addrs);
2117 : /* fall through to examine substructure */
2118 : }
2119 419344 : else if (IsA(node, CTECycleClause))
2120 : {
2121 12 : CTECycleClause *cc = (CTECycleClause *) node;
2122 :
2123 12 : if (OidIsValid(cc->cycle_mark_type))
2124 12 : add_object_address(TypeRelationId, cc->cycle_mark_type, 0,
2125 : context->addrs);
2126 12 : if (OidIsValid(cc->cycle_mark_collation))
2127 6 : add_object_address(CollationRelationId, cc->cycle_mark_collation, 0,
2128 : context->addrs);
2129 12 : if (OidIsValid(cc->cycle_mark_neop))
2130 12 : add_object_address(OperatorRelationId, cc->cycle_mark_neop, 0,
2131 : context->addrs);
2132 : /* fall through to examine substructure */
2133 : }
2134 419332 : else if (IsA(node, Query))
2135 : {
2136 : /* Recurse into RTE subquery or not-yet-planned sublink subquery */
2137 30082 : Query *query = (Query *) node;
2138 : ListCell *lc;
2139 : bool result;
2140 :
2141 : /*
2142 : * Add whole-relation refs for each plain relation mentioned in the
2143 : * subquery's rtable, and ensure we add refs for any type-coercion
2144 : * functions used in join alias lists.
2145 : *
2146 : * Note: query_tree_walker takes care of recursing into RTE_FUNCTION
2147 : * RTEs, subqueries, etc, so no need to do that here. But we must
2148 : * tell it not to visit join alias lists, or we'll add refs for join
2149 : * input columns whether or not they are actually used in our query.
2150 : *
2151 : * Note: we don't need to worry about collations mentioned in
2152 : * RTE_VALUES or RTE_CTE RTEs, because those must just duplicate
2153 : * collations referenced in other parts of the Query. We do have to
2154 : * worry about collations mentioned in RTE_FUNCTION, but we take care
2155 : * of those when we recurse to the RangeTblFunction node(s).
2156 : */
2157 94512 : foreach(lc, query->rtable)
2158 : {
2159 64430 : RangeTblEntry *rte = (RangeTblEntry *) lfirst(lc);
2160 :
2161 64430 : switch (rte->rtekind)
2162 : {
2163 40930 : case RTE_RELATION:
2164 40930 : add_object_address(RelationRelationId, rte->relid, 0,
2165 : context->addrs);
2166 40930 : break;
2167 11662 : case RTE_JOIN:
2168 :
2169 : /*
2170 : * Examine joinaliasvars entries only for merged JOIN
2171 : * USING columns. Only those entries could contain
2172 : * type-coercion functions. Also, their join input
2173 : * columns must be referenced in the join quals, so this
2174 : * won't accidentally add refs to otherwise-unused join
2175 : * input columns. (We want to ref the type coercion
2176 : * functions even if the merged column isn't explicitly
2177 : * used anywhere, to protect possible expansion of the
2178 : * join RTE as a whole-row var, and because it seems like
2179 : * a bad idea to allow dropping a function that's present
2180 : * in our query tree, whether or not it could get called.)
2181 : */
2182 11662 : context->rtables = lcons(query->rtable, context->rtables);
2183 11862 : for (int i = 0; i < rte->joinmergedcols; i++)
2184 : {
2185 200 : Node *aliasvar = list_nth(rte->joinaliasvars, i);
2186 :
2187 200 : if (!IsA(aliasvar, Var))
2188 48 : find_expr_references_walker(aliasvar, context);
2189 : }
2190 11662 : context->rtables = list_delete_first(context->rtables);
2191 11662 : break;
2192 11838 : default:
2193 11838 : break;
2194 : }
2195 : }
2196 :
2197 : /*
2198 : * If the query is an INSERT or UPDATE, we should create a dependency
2199 : * on each target column, to prevent the specific target column from
2200 : * being dropped. Although we will visit the TargetEntry nodes again
2201 : * during query_tree_walker, we won't have enough context to do this
2202 : * conveniently, so do it here.
2203 : */
2204 30082 : if (query->commandType == CMD_INSERT ||
2205 29626 : query->commandType == CMD_UPDATE)
2206 : {
2207 : RangeTblEntry *rte;
2208 :
2209 1300 : if (query->resultRelation <= 0 ||
2210 650 : query->resultRelation > list_length(query->rtable))
2211 0 : elog(ERROR, "invalid resultRelation %d",
2212 : query->resultRelation);
2213 650 : rte = rt_fetch(query->resultRelation, query->rtable);
2214 650 : if (rte->rtekind == RTE_RELATION)
2215 : {
2216 1998 : foreach(lc, query->targetList)
2217 : {
2218 1348 : TargetEntry *tle = (TargetEntry *) lfirst(lc);
2219 :
2220 1348 : if (tle->resjunk)
2221 6 : continue; /* ignore junk tlist items */
2222 1342 : add_object_address(RelationRelationId, rte->relid, tle->resno,
2223 : context->addrs);
2224 : }
2225 : }
2226 : }
2227 :
2228 : /*
2229 : * Add dependencies on constraints listed in query's constraintDeps
2230 : */
2231 30138 : foreach(lc, query->constraintDeps)
2232 : {
2233 56 : add_object_address(ConstraintRelationId, lfirst_oid(lc), 0,
2234 : context->addrs);
2235 : }
2236 :
2237 : /* Examine substructure of query */
2238 30082 : context->rtables = lcons(query->rtable, context->rtables);
2239 30082 : result = query_tree_walker(query,
2240 : find_expr_references_walker,
2241 : (void *) context,
2242 : QTW_IGNORE_JOINALIASES |
2243 : QTW_EXAMINE_SORTGROUP);
2244 30082 : context->rtables = list_delete_first(context->rtables);
2245 30082 : return result;
2246 : }
2247 389250 : else if (IsA(node, SetOperationStmt))
2248 : {
2249 2996 : SetOperationStmt *setop = (SetOperationStmt *) node;
2250 :
2251 : /* we need to look at the groupClauses for operator references */
2252 2996 : find_expr_references_walker((Node *) setop->groupClauses, context);
2253 : /* fall through to examine child nodes */
2254 : }
2255 386254 : else if (IsA(node, RangeTblFunction))
2256 : {
2257 4012 : RangeTblFunction *rtfunc = (RangeTblFunction *) node;
2258 : ListCell *ct;
2259 :
2260 : /*
2261 : * Add refs for any datatypes and collations used in a column
2262 : * definition list for a RECORD function. (For other cases, it should
2263 : * be enough to depend on the function itself.)
2264 : */
2265 4120 : foreach(ct, rtfunc->funccoltypes)
2266 : {
2267 108 : add_object_address(TypeRelationId, lfirst_oid(ct), 0,
2268 : context->addrs);
2269 : }
2270 4120 : foreach(ct, rtfunc->funccolcollations)
2271 : {
2272 108 : Oid collid = lfirst_oid(ct);
2273 :
2274 108 : if (OidIsValid(collid) && collid != DEFAULT_COLLATION_OID)
2275 0 : add_object_address(CollationRelationId, collid, 0,
2276 : context->addrs);
2277 : }
2278 : }
2279 382242 : else if (IsA(node, TableFunc))
2280 : {
2281 58 : TableFunc *tf = (TableFunc *) node;
2282 : ListCell *ct;
2283 :
2284 : /*
2285 : * Add refs for the datatypes and collations used in the TableFunc.
2286 : */
2287 340 : foreach(ct, tf->coltypes)
2288 : {
2289 282 : add_object_address(TypeRelationId, lfirst_oid(ct), 0,
2290 : context->addrs);
2291 : }
2292 340 : foreach(ct, tf->colcollations)
2293 : {
2294 282 : Oid collid = lfirst_oid(ct);
2295 :
2296 282 : if (OidIsValid(collid) && collid != DEFAULT_COLLATION_OID)
2297 0 : add_object_address(CollationRelationId, collid, 0,
2298 : context->addrs);
2299 : }
2300 : }
2301 382184 : else if (IsA(node, TableSampleClause))
2302 : {
2303 20 : TableSampleClause *tsc = (TableSampleClause *) node;
2304 :
2305 20 : add_object_address(ProcedureRelationId, tsc->tsmhandler, 0,
2306 : context->addrs);
2307 : /* fall through to examine arguments */
2308 : }
2309 :
2310 622040 : return expression_tree_walker(node, find_expr_references_walker,
2311 : (void *) context);
2312 : }
2313 :
2314 : /*
2315 : * find_expr_references_walker subroutine: handle a Var reference
2316 : * to an RTE_FUNCTION RTE
2317 : */
2318 : static void
2319 32712 : process_function_rte_ref(RangeTblEntry *rte, AttrNumber attnum,
2320 : find_expr_references_context *context)
2321 : {
2322 32712 : int atts_done = 0;
2323 : ListCell *lc;
2324 :
2325 : /*
2326 : * Identify which RangeTblFunction produces this attnum, and see if it
2327 : * returns a composite type. If so, we'd better make a dependency on the
2328 : * referenced column of the composite type (or actually, of its associated
2329 : * relation).
2330 : */
2331 32934 : foreach(lc, rte->functions)
2332 : {
2333 32844 : RangeTblFunction *rtfunc = (RangeTblFunction *) lfirst(lc);
2334 :
2335 32844 : if (attnum > atts_done &&
2336 32844 : attnum <= atts_done + rtfunc->funccolcount)
2337 : {
2338 : TupleDesc tupdesc;
2339 :
2340 : /* If it has a coldeflist, it certainly returns RECORD */
2341 32622 : if (rtfunc->funccolnames != NIL)
2342 108 : tupdesc = NULL; /* no need to work hard */
2343 : else
2344 32514 : tupdesc = get_expr_result_tupdesc(rtfunc->funcexpr, true);
2345 32622 : if (tupdesc && tupdesc->tdtypeid != RECORDOID)
2346 : {
2347 : /*
2348 : * Named composite type, so individual columns could get
2349 : * dropped. Make a dependency on this specific column.
2350 : */
2351 222 : Oid reltype = get_typ_typrelid(tupdesc->tdtypeid);
2352 :
2353 : Assert(attnum - atts_done <= tupdesc->natts);
2354 222 : if (OidIsValid(reltype)) /* can this fail? */
2355 222 : add_object_address(RelationRelationId, reltype,
2356 : attnum - atts_done,
2357 : context->addrs);
2358 32622 : return;
2359 : }
2360 : /* Nothing to do; function's result type is handled elsewhere */
2361 32400 : return;
2362 : }
2363 222 : atts_done += rtfunc->funccolcount;
2364 : }
2365 :
2366 : /* If we get here, must be looking for the ordinality column */
2367 90 : if (rte->funcordinality && attnum == atts_done + 1)
2368 90 : return;
2369 :
2370 : /* this probably can't happen ... */
2371 0 : ereport(ERROR,
2372 : (errcode(ERRCODE_UNDEFINED_COLUMN),
2373 : errmsg("column %d of relation \"%s\" does not exist",
2374 : attnum, rte->eref->aliasname)));
2375 : }
2376 :
2377 : /*
2378 : * Given an array of dependency references, eliminate any duplicates.
2379 : */
2380 : static void
2381 355082 : eliminate_duplicate_dependencies(ObjectAddresses *addrs)
2382 : {
2383 : ObjectAddress *priorobj;
2384 : int oldref,
2385 : newrefs;
2386 :
2387 : /*
2388 : * We can't sort if the array has "extra" data, because there's no way to
2389 : * keep it in sync. Fortunately that combination of features is not
2390 : * needed.
2391 : */
2392 : Assert(!addrs->extras);
2393 :
2394 355082 : if (addrs->numrefs <= 1)
2395 108232 : return; /* nothing to do */
2396 :
2397 : /* Sort the refs so that duplicates are adjacent */
2398 246850 : qsort(addrs->refs, addrs->numrefs, sizeof(ObjectAddress),
2399 : object_address_comparator);
2400 :
2401 : /* Remove dups */
2402 246850 : priorobj = addrs->refs;
2403 246850 : newrefs = 1;
2404 1595386 : for (oldref = 1; oldref < addrs->numrefs; oldref++)
2405 : {
2406 1348536 : ObjectAddress *thisobj = addrs->refs + oldref;
2407 :
2408 1348536 : if (priorobj->classId == thisobj->classId &&
2409 1155082 : priorobj->objectId == thisobj->objectId)
2410 : {
2411 593608 : if (priorobj->objectSubId == thisobj->objectSubId)
2412 455720 : continue; /* identical, so drop thisobj */
2413 :
2414 : /*
2415 : * If we have a whole-object reference and a reference to a part
2416 : * of the same object, we don't need the whole-object reference
2417 : * (for example, we don't need to reference both table foo and
2418 : * column foo.bar). The whole-object reference will always appear
2419 : * first in the sorted list.
2420 : */
2421 137888 : if (priorobj->objectSubId == 0)
2422 : {
2423 : /* replace whole ref with partial */
2424 30022 : priorobj->objectSubId = thisobj->objectSubId;
2425 30022 : continue;
2426 : }
2427 : }
2428 : /* Not identical, so add thisobj to output set */
2429 862794 : priorobj++;
2430 862794 : *priorobj = *thisobj;
2431 862794 : newrefs++;
2432 : }
2433 :
2434 246850 : addrs->numrefs = newrefs;
2435 : }
2436 :
2437 : /*
2438 : * qsort comparator for ObjectAddress items
2439 : */
2440 : static int
2441 4574778 : object_address_comparator(const void *a, const void *b)
2442 : {
2443 4574778 : const ObjectAddress *obja = (const ObjectAddress *) a;
2444 4574778 : const ObjectAddress *objb = (const ObjectAddress *) b;
2445 :
2446 : /*
2447 : * Primary sort key is OID descending. Most of the time, this will result
2448 : * in putting newer objects before older ones, which is likely to be the
2449 : * right order to delete in.
2450 : */
2451 4574778 : if (obja->objectId > objb->objectId)
2452 1071382 : return -1;
2453 3503396 : if (obja->objectId < objb->objectId)
2454 2473036 : return 1;
2455 :
2456 : /*
2457 : * Next sort on catalog ID, in case identical OIDs appear in different
2458 : * catalogs. Sort direction is pretty arbitrary here.
2459 : */
2460 1030360 : if (obja->classId < objb->classId)
2461 0 : return -1;
2462 1030360 : if (obja->classId > objb->classId)
2463 0 : return 1;
2464 :
2465 : /*
2466 : * Last, sort on object subId.
2467 : *
2468 : * We sort the subId as an unsigned int so that 0 (the whole object) will
2469 : * come first. This is essential for eliminate_duplicate_dependencies,
2470 : * and is also the best order for findDependentObjects.
2471 : */
2472 1030360 : if ((unsigned int) obja->objectSubId < (unsigned int) objb->objectSubId)
2473 246312 : return -1;
2474 784048 : if ((unsigned int) obja->objectSubId > (unsigned int) objb->objectSubId)
2475 225044 : return 1;
2476 559004 : return 0;
2477 : }
2478 :
2479 : /*
2480 : * Routines for handling an expansible array of ObjectAddress items.
2481 : *
2482 : * new_object_addresses: create a new ObjectAddresses array.
2483 : */
2484 : ObjectAddresses *
2485 415292 : new_object_addresses(void)
2486 : {
2487 : ObjectAddresses *addrs;
2488 :
2489 415292 : addrs = palloc(sizeof(ObjectAddresses));
2490 :
2491 415292 : addrs->numrefs = 0;
2492 415292 : addrs->maxrefs = 32;
2493 415292 : addrs->refs = (ObjectAddress *)
2494 415292 : palloc(addrs->maxrefs * sizeof(ObjectAddress));
2495 415292 : addrs->extras = NULL; /* until/unless needed */
2496 :
2497 415292 : return addrs;
2498 : }
2499 :
2500 : /*
2501 : * Add an entry to an ObjectAddresses array.
2502 : */
2503 : static void
2504 631754 : add_object_address(Oid classId, Oid objectId, int32 subId,
2505 : ObjectAddresses *addrs)
2506 : {
2507 : ObjectAddress *item;
2508 :
2509 : /* enlarge array if needed */
2510 631754 : if (addrs->numrefs >= addrs->maxrefs)
2511 : {
2512 8542 : addrs->maxrefs *= 2;
2513 8542 : addrs->refs = (ObjectAddress *)
2514 8542 : repalloc(addrs->refs, addrs->maxrefs * sizeof(ObjectAddress));
2515 : Assert(!addrs->extras);
2516 : }
2517 : /* record this item */
2518 631754 : item = addrs->refs + addrs->numrefs;
2519 631754 : item->classId = classId;
2520 631754 : item->objectId = objectId;
2521 631754 : item->objectSubId = subId;
2522 631754 : addrs->numrefs++;
2523 631754 : }
2524 :
2525 : /*
2526 : * Add an entry to an ObjectAddresses array.
2527 : *
2528 : * As above, but specify entry exactly.
2529 : */
2530 : void
2531 1074202 : add_exact_object_address(const ObjectAddress *object,
2532 : ObjectAddresses *addrs)
2533 : {
2534 : ObjectAddress *item;
2535 :
2536 : /* enlarge array if needed */
2537 1074202 : if (addrs->numrefs >= addrs->maxrefs)
2538 : {
2539 42 : addrs->maxrefs *= 2;
2540 42 : addrs->refs = (ObjectAddress *)
2541 42 : repalloc(addrs->refs, addrs->maxrefs * sizeof(ObjectAddress));
2542 : Assert(!addrs->extras);
2543 : }
2544 : /* record this item */
2545 1074202 : item = addrs->refs + addrs->numrefs;
2546 1074202 : *item = *object;
2547 1074202 : addrs->numrefs++;
2548 1074202 : }
2549 :
2550 : /*
2551 : * Add an entry to an ObjectAddresses array.
2552 : *
2553 : * As above, but specify entry exactly and provide some "extra" data too.
2554 : */
2555 : static void
2556 189480 : add_exact_object_address_extra(const ObjectAddress *object,
2557 : const ObjectAddressExtra *extra,
2558 : ObjectAddresses *addrs)
2559 : {
2560 : ObjectAddress *item;
2561 : ObjectAddressExtra *itemextra;
2562 :
2563 : /* allocate extra space if first time */
2564 189480 : if (!addrs->extras)
2565 30252 : addrs->extras = (ObjectAddressExtra *)
2566 30252 : palloc(addrs->maxrefs * sizeof(ObjectAddressExtra));
2567 :
2568 : /* enlarge array if needed */
2569 189480 : if (addrs->numrefs >= addrs->maxrefs)
2570 : {
2571 658 : addrs->maxrefs *= 2;
2572 658 : addrs->refs = (ObjectAddress *)
2573 658 : repalloc(addrs->refs, addrs->maxrefs * sizeof(ObjectAddress));
2574 658 : addrs->extras = (ObjectAddressExtra *)
2575 658 : repalloc(addrs->extras, addrs->maxrefs * sizeof(ObjectAddressExtra));
2576 : }
2577 : /* record this item */
2578 189480 : item = addrs->refs + addrs->numrefs;
2579 189480 : *item = *object;
2580 189480 : itemextra = addrs->extras + addrs->numrefs;
2581 189480 : *itemextra = *extra;
2582 189480 : addrs->numrefs++;
2583 189480 : }
2584 :
2585 : /*
2586 : * Test whether an object is present in an ObjectAddresses array.
2587 : *
2588 : * We return "true" if object is a subobject of something in the array, too.
2589 : */
2590 : bool
2591 600 : object_address_present(const ObjectAddress *object,
2592 : const ObjectAddresses *addrs)
2593 : {
2594 : int i;
2595 :
2596 2204 : for (i = addrs->numrefs - 1; i >= 0; i--)
2597 : {
2598 1604 : const ObjectAddress *thisobj = addrs->refs + i;
2599 :
2600 1604 : if (object->classId == thisobj->classId &&
2601 428 : object->objectId == thisobj->objectId)
2602 : {
2603 0 : if (object->objectSubId == thisobj->objectSubId ||
2604 0 : thisobj->objectSubId == 0)
2605 0 : return true;
2606 : }
2607 : }
2608 :
2609 600 : return false;
2610 : }
2611 :
2612 : /*
2613 : * As above, except that if the object is present then also OR the given
2614 : * flags into its associated extra data (which must exist).
2615 : */
2616 : static bool
2617 234026 : object_address_present_add_flags(const ObjectAddress *object,
2618 : int flags,
2619 : ObjectAddresses *addrs)
2620 : {
2621 234026 : bool result = false;
2622 : int i;
2623 :
2624 5513240 : for (i = addrs->numrefs - 1; i >= 0; i--)
2625 : {
2626 5279214 : ObjectAddress *thisobj = addrs->refs + i;
2627 :
2628 5279214 : if (object->classId == thisobj->classId &&
2629 1742728 : object->objectId == thisobj->objectId)
2630 : {
2631 43038 : if (object->objectSubId == thisobj->objectSubId)
2632 : {
2633 42624 : ObjectAddressExtra *thisextra = addrs->extras + i;
2634 :
2635 42624 : thisextra->flags |= flags;
2636 42624 : result = true;
2637 : }
2638 414 : else if (thisobj->objectSubId == 0)
2639 : {
2640 : /*
2641 : * We get here if we find a need to delete a column after
2642 : * having already decided to drop its whole table. Obviously
2643 : * we no longer need to drop the subobject, so report that we
2644 : * found the subobject in the array. But don't plaster its
2645 : * flags on the whole object.
2646 : */
2647 396 : result = true;
2648 : }
2649 18 : else if (object->objectSubId == 0)
2650 : {
2651 : /*
2652 : * We get here if we find a need to delete a whole table after
2653 : * having already decided to drop one of its columns. We
2654 : * can't report that the whole object is in the array, but we
2655 : * should mark the subobject with the whole object's flags.
2656 : *
2657 : * It might seem attractive to physically delete the column's
2658 : * array entry, or at least mark it as no longer needing
2659 : * separate deletion. But that could lead to, e.g., dropping
2660 : * the column's datatype before we drop the table, which does
2661 : * not seem like a good idea. This is a very rare situation
2662 : * in practice, so we just take the hit of doing a separate
2663 : * DROP COLUMN action even though we know we're gonna delete
2664 : * the table later.
2665 : *
2666 : * What we can do, though, is mark this as a subobject so that
2667 : * we don't report it separately, which is confusing because
2668 : * it's unpredictable whether it happens or not. But do so
2669 : * only if flags != 0 (flags == 0 is a read-only probe).
2670 : *
2671 : * Because there could be other subobjects of this object in
2672 : * the array, this case means we always have to loop through
2673 : * the whole array; we cannot exit early on a match.
2674 : */
2675 6 : ObjectAddressExtra *thisextra = addrs->extras + i;
2676 :
2677 6 : if (flags)
2678 6 : thisextra->flags |= (flags | DEPFLAG_SUBOBJECT);
2679 : }
2680 : }
2681 : }
2682 :
2683 234026 : return result;
2684 : }
2685 :
2686 : /*
2687 : * Similar to above, except we search an ObjectAddressStack.
2688 : */
2689 : static bool
2690 335958 : stack_address_present_add_flags(const ObjectAddress *object,
2691 : int flags,
2692 : ObjectAddressStack *stack)
2693 : {
2694 335958 : bool result = false;
2695 : ObjectAddressStack *stackptr;
2696 :
2697 897312 : for (stackptr = stack; stackptr; stackptr = stackptr->next)
2698 : {
2699 561354 : const ObjectAddress *thisobj = stackptr->object;
2700 :
2701 561354 : if (object->classId == thisobj->classId &&
2702 256638 : object->objectId == thisobj->objectId)
2703 : {
2704 101968 : if (object->objectSubId == thisobj->objectSubId)
2705 : {
2706 101248 : stackptr->flags |= flags;
2707 101248 : result = true;
2708 : }
2709 720 : else if (thisobj->objectSubId == 0)
2710 : {
2711 : /*
2712 : * We're visiting a column with whole table already on stack.
2713 : * As in object_address_present_add_flags(), we can skip
2714 : * further processing of the subobject, but we don't want to
2715 : * propagate flags for the subobject to the whole object.
2716 : */
2717 684 : result = true;
2718 : }
2719 36 : else if (object->objectSubId == 0)
2720 : {
2721 : /*
2722 : * We're visiting a table with column already on stack. As in
2723 : * object_address_present_add_flags(), we should propagate
2724 : * flags for the whole object to each of its subobjects.
2725 : */
2726 0 : if (flags)
2727 0 : stackptr->flags |= (flags | DEPFLAG_SUBOBJECT);
2728 : }
2729 : }
2730 : }
2731 :
2732 335958 : return result;
2733 : }
2734 :
2735 : /*
2736 : * Record multiple dependencies from an ObjectAddresses array, after first
2737 : * removing any duplicates.
2738 : */
2739 : void
2740 322384 : record_object_address_dependencies(const ObjectAddress *depender,
2741 : ObjectAddresses *referenced,
2742 : DependencyType behavior)
2743 : {
2744 322384 : eliminate_duplicate_dependencies(referenced);
2745 322384 : recordMultipleDependencies(depender,
2746 322384 : referenced->refs, referenced->numrefs,
2747 : behavior);
2748 322384 : }
2749 :
2750 : /*
2751 : * Sort the items in an ObjectAddresses array.
2752 : *
2753 : * The major sort key is OID-descending, so that newer objects will be listed
2754 : * first in most cases. This is primarily useful for ensuring stable outputs
2755 : * from regression tests; it's not recommended if the order of the objects is
2756 : * determined by user input, such as the order of targets in a DROP command.
2757 : */
2758 : void
2759 134 : sort_object_addresses(ObjectAddresses *addrs)
2760 : {
2761 134 : if (addrs->numrefs > 1)
2762 76 : qsort(addrs->refs, addrs->numrefs,
2763 : sizeof(ObjectAddress),
2764 : object_address_comparator);
2765 134 : }
2766 :
2767 : /*
2768 : * Clean up when done with an ObjectAddresses array.
2769 : */
2770 : void
2771 413324 : free_object_addresses(ObjectAddresses *addrs)
2772 : {
2773 413324 : pfree(addrs->refs);
2774 413324 : if (addrs->extras)
2775 29916 : pfree(addrs->extras);
2776 413324 : pfree(addrs);
2777 413324 : }
2778 :
2779 : /*
2780 : * delete initial ACL for extension objects
2781 : */
2782 : static void
2783 184606 : DeleteInitPrivs(const ObjectAddress *object)
2784 : {
2785 : Relation relation;
2786 : ScanKeyData key[3];
2787 : SysScanDesc scan;
2788 : HeapTuple oldtuple;
2789 :
2790 184606 : relation = table_open(InitPrivsRelationId, RowExclusiveLock);
2791 :
2792 184606 : ScanKeyInit(&key[0],
2793 : Anum_pg_init_privs_objoid,
2794 : BTEqualStrategyNumber, F_OIDEQ,
2795 : ObjectIdGetDatum(object->objectId));
2796 184606 : ScanKeyInit(&key[1],
2797 : Anum_pg_init_privs_classoid,
2798 : BTEqualStrategyNumber, F_OIDEQ,
2799 : ObjectIdGetDatum(object->classId));
2800 184606 : ScanKeyInit(&key[2],
2801 : Anum_pg_init_privs_objsubid,
2802 : BTEqualStrategyNumber, F_INT4EQ,
2803 : Int32GetDatum(object->objectSubId));
2804 :
2805 184606 : scan = systable_beginscan(relation, InitPrivsObjIndexId, true,
2806 : NULL, 3, key);
2807 :
2808 184696 : while (HeapTupleIsValid(oldtuple = systable_getnext(scan)))
2809 90 : CatalogTupleDelete(relation, &oldtuple->t_self);
2810 :
2811 184606 : systable_endscan(scan);
2812 :
2813 184606 : table_close(relation, RowExclusiveLock);
2814 184606 : }
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