Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * heap.c
4 : * code to create and destroy POSTGRES heap relations
5 : *
6 : * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
7 : * Portions Copyright (c) 1994, Regents of the University of California
8 : *
9 : *
10 : * IDENTIFICATION
11 : * src/backend/catalog/heap.c
12 : *
13 : *
14 : * INTERFACE ROUTINES
15 : * heap_create() - Create an uncataloged heap relation
16 : * heap_create_with_catalog() - Create a cataloged relation
17 : * heap_drop_with_catalog() - Removes named relation from catalogs
18 : *
19 : * NOTES
20 : * this code taken from access/heap/create.c, which contains
21 : * the old heap_create_with_catalog, amcreate, and amdestroy.
22 : * those routines will soon call these routines using the function
23 : * manager,
24 : * just like the poorly named "NewXXX" routines do. The
25 : * "New" routines are all going to die soon, once and for all!
26 : * -cim 1/13/91
27 : *
28 : *-------------------------------------------------------------------------
29 : */
30 : #include "postgres.h"
31 :
32 : #include "access/htup_details.h"
33 : #include "access/multixact.h"
34 : #include "access/sysattr.h"
35 : #include "access/transam.h"
36 : #include "access/xact.h"
37 : #include "access/xlog.h"
38 : #include "catalog/binary_upgrade.h"
39 : #include "catalog/catalog.h"
40 : #include "catalog/dependency.h"
41 : #include "catalog/heap.h"
42 : #include "catalog/index.h"
43 : #include "catalog/objectaccess.h"
44 : #include "catalog/partition.h"
45 : #include "catalog/pg_attrdef.h"
46 : #include "catalog/pg_collation.h"
47 : #include "catalog/pg_constraint.h"
48 : #include "catalog/pg_constraint_fn.h"
49 : #include "catalog/pg_foreign_table.h"
50 : #include "catalog/pg_inherits.h"
51 : #include "catalog/pg_namespace.h"
52 : #include "catalog/pg_opclass.h"
53 : #include "catalog/pg_partitioned_table.h"
54 : #include "catalog/pg_statistic.h"
55 : #include "catalog/pg_subscription_rel.h"
56 : #include "catalog/pg_tablespace.h"
57 : #include "catalog/pg_type.h"
58 : #include "catalog/pg_type_fn.h"
59 : #include "catalog/storage.h"
60 : #include "catalog/storage_xlog.h"
61 : #include "commands/tablecmds.h"
62 : #include "commands/typecmds.h"
63 : #include "miscadmin.h"
64 : #include "nodes/nodeFuncs.h"
65 : #include "optimizer/var.h"
66 : #include "parser/parse_coerce.h"
67 : #include "parser/parse_collate.h"
68 : #include "parser/parse_expr.h"
69 : #include "parser/parse_relation.h"
70 : #include "storage/lmgr.h"
71 : #include "storage/predicate.h"
72 : #include "storage/smgr.h"
73 : #include "utils/acl.h"
74 : #include "utils/builtins.h"
75 : #include "utils/fmgroids.h"
76 : #include "utils/inval.h"
77 : #include "utils/lsyscache.h"
78 : #include "utils/rel.h"
79 : #include "utils/ruleutils.h"
80 : #include "utils/snapmgr.h"
81 : #include "utils/syscache.h"
82 : #include "utils/tqual.h"
83 :
84 :
85 : /* Potentially set by pg_upgrade_support functions */
86 : Oid binary_upgrade_next_heap_pg_class_oid = InvalidOid;
87 : Oid binary_upgrade_next_toast_pg_class_oid = InvalidOid;
88 :
89 : static void AddNewRelationTuple(Relation pg_class_desc,
90 : Relation new_rel_desc,
91 : Oid new_rel_oid,
92 : Oid new_type_oid,
93 : Oid reloftype,
94 : Oid relowner,
95 : char relkind,
96 : Datum relacl,
97 : Datum reloptions);
98 : static ObjectAddress AddNewRelationType(const char *typeName,
99 : Oid typeNamespace,
100 : Oid new_rel_oid,
101 : char new_rel_kind,
102 : Oid ownerid,
103 : Oid new_row_type,
104 : Oid new_array_type);
105 : static void RelationRemoveInheritance(Oid relid);
106 : static Oid StoreRelCheck(Relation rel, char *ccname, Node *expr,
107 : bool is_validated, bool is_local, int inhcount,
108 : bool is_no_inherit, bool is_internal);
109 : static void StoreConstraints(Relation rel, List *cooked_constraints,
110 : bool is_internal);
111 : static bool MergeWithExistingConstraint(Relation rel, char *ccname, Node *expr,
112 : bool allow_merge, bool is_local,
113 : bool is_initially_valid,
114 : bool is_no_inherit);
115 : static void SetRelationNumChecks(Relation rel, int numchecks);
116 : static Node *cookConstraint(ParseState *pstate,
117 : Node *raw_constraint,
118 : char *relname);
119 : static List *insert_ordered_unique_oid(List *list, Oid datum);
120 :
121 :
122 : /* ----------------------------------------------------------------
123 : * XXX UGLY HARD CODED BADNESS FOLLOWS XXX
124 : *
125 : * these should all be moved to someplace in the lib/catalog
126 : * module, if not obliterated first.
127 : * ----------------------------------------------------------------
128 : */
129 :
130 :
131 : /*
132 : * Note:
133 : * Should the system special case these attributes in the future?
134 : * Advantage: consume much less space in the ATTRIBUTE relation.
135 : * Disadvantage: special cases will be all over the place.
136 : */
137 :
138 : /*
139 : * The initializers below do not include trailing variable length fields,
140 : * but that's OK - we're never going to reference anything beyond the
141 : * fixed-size portion of the structure anyway.
142 : */
143 :
144 : static FormData_pg_attribute a1 = {
145 : 0, {"ctid"}, TIDOID, 0, sizeof(ItemPointerData),
146 : SelfItemPointerAttributeNumber, 0, -1, -1,
147 : false, 'p', 's', true, false, '\0', false, true, 0
148 : };
149 :
150 : static FormData_pg_attribute a2 = {
151 : 0, {"oid"}, OIDOID, 0, sizeof(Oid),
152 : ObjectIdAttributeNumber, 0, -1, -1,
153 : true, 'p', 'i', true, false, '\0', false, true, 0
154 : };
155 :
156 : static FormData_pg_attribute a3 = {
157 : 0, {"xmin"}, XIDOID, 0, sizeof(TransactionId),
158 : MinTransactionIdAttributeNumber, 0, -1, -1,
159 : true, 'p', 'i', true, false, '\0', false, true, 0
160 : };
161 :
162 : static FormData_pg_attribute a4 = {
163 : 0, {"cmin"}, CIDOID, 0, sizeof(CommandId),
164 : MinCommandIdAttributeNumber, 0, -1, -1,
165 : true, 'p', 'i', true, false, '\0', false, true, 0
166 : };
167 :
168 : static FormData_pg_attribute a5 = {
169 : 0, {"xmax"}, XIDOID, 0, sizeof(TransactionId),
170 : MaxTransactionIdAttributeNumber, 0, -1, -1,
171 : true, 'p', 'i', true, false, '\0', false, true, 0
172 : };
173 :
174 : static FormData_pg_attribute a6 = {
175 : 0, {"cmax"}, CIDOID, 0, sizeof(CommandId),
176 : MaxCommandIdAttributeNumber, 0, -1, -1,
177 : true, 'p', 'i', true, false, '\0', false, true, 0
178 : };
179 :
180 : /*
181 : * We decided to call this attribute "tableoid" rather than say
182 : * "classoid" on the basis that in the future there may be more than one
183 : * table of a particular class/type. In any case table is still the word
184 : * used in SQL.
185 : */
186 : static FormData_pg_attribute a7 = {
187 : 0, {"tableoid"}, OIDOID, 0, sizeof(Oid),
188 : TableOidAttributeNumber, 0, -1, -1,
189 : true, 'p', 'i', true, false, '\0', false, true, 0
190 : };
191 :
192 : static const Form_pg_attribute SysAtt[] = {&a1, &a2, &a3, &a4, &a5, &a6, &a7};
193 :
194 : /*
195 : * This function returns a Form_pg_attribute pointer for a system attribute.
196 : * Note that we elog if the presented attno is invalid, which would only
197 : * happen if there's a problem upstream.
198 : */
199 : Form_pg_attribute
200 5747 : SystemAttributeDefinition(AttrNumber attno, bool relhasoids)
201 : {
202 5747 : if (attno >= 0 || attno < -(int) lengthof(SysAtt))
203 0 : elog(ERROR, "invalid system attribute number %d", attno);
204 5747 : if (attno == ObjectIdAttributeNumber && !relhasoids)
205 0 : elog(ERROR, "invalid system attribute number %d", attno);
206 5747 : return SysAtt[-attno - 1];
207 : }
208 :
209 : /*
210 : * If the given name is a system attribute name, return a Form_pg_attribute
211 : * pointer for a prototype definition. If not, return NULL.
212 : */
213 : Form_pg_attribute
214 15200 : SystemAttributeByName(const char *attname, bool relhasoids)
215 : {
216 : int j;
217 :
218 80646 : for (j = 0; j < (int) lengthof(SysAtt); j++)
219 : {
220 72175 : Form_pg_attribute att = SysAtt[j];
221 :
222 72175 : if (relhasoids || att->attnum != ObjectIdAttributeNumber)
223 : {
224 65898 : if (strcmp(NameStr(att->attname), attname) == 0)
225 6729 : return att;
226 : }
227 : }
228 :
229 8471 : return NULL;
230 : }
231 :
232 :
233 : /* ----------------------------------------------------------------
234 : * XXX END OF UGLY HARD CODED BADNESS XXX
235 : * ---------------------------------------------------------------- */
236 :
237 :
238 : /* ----------------------------------------------------------------
239 : * heap_create - Create an uncataloged heap relation
240 : *
241 : * Note API change: the caller must now always provide the OID
242 : * to use for the relation. The relfilenode may (and, normally,
243 : * should) be left unspecified.
244 : *
245 : * rel->rd_rel is initialized by RelationBuildLocalRelation,
246 : * and is mostly zeroes at return.
247 : * ----------------------------------------------------------------
248 : */
249 : Relation
250 4376 : heap_create(const char *relname,
251 : Oid relnamespace,
252 : Oid reltablespace,
253 : Oid relid,
254 : Oid relfilenode,
255 : TupleDesc tupDesc,
256 : char relkind,
257 : char relpersistence,
258 : bool shared_relation,
259 : bool mapped_relation,
260 : bool allow_system_table_mods)
261 : {
262 : bool create_storage;
263 : Relation rel;
264 :
265 : /* The caller must have provided an OID for the relation. */
266 4376 : Assert(OidIsValid(relid));
267 :
268 : /*
269 : * Don't allow creating relations in pg_catalog directly, even though it
270 : * is allowed to move user defined relations there. Semantics with search
271 : * paths including pg_catalog are too confusing for now.
272 : *
273 : * But allow creating indexes on relations in pg_catalog even if
274 : * allow_system_table_mods = off, upper layers already guarantee it's on a
275 : * user defined relation, not a system one.
276 : */
277 7058 : if (!allow_system_table_mods &&
278 5480 : ((IsSystemNamespace(relnamespace) && relkind != RELKIND_INDEX) ||
279 2682 : IsToastNamespace(relnamespace)) &&
280 1 : IsNormalProcessingMode())
281 1 : ereport(ERROR,
282 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
283 : errmsg("permission denied to create \"%s.%s\"",
284 : get_namespace_name(relnamespace), relname),
285 : errdetail("System catalog modifications are currently disallowed.")));
286 :
287 : /*
288 : * Decide if we need storage or not, and handle a couple other special
289 : * cases for particular relkinds.
290 : */
291 4375 : switch (relkind)
292 : {
293 : case RELKIND_VIEW:
294 : case RELKIND_COMPOSITE_TYPE:
295 : case RELKIND_FOREIGN_TABLE:
296 : case RELKIND_PARTITIONED_TABLE:
297 536 : create_storage = false;
298 :
299 : /*
300 : * Force reltablespace to zero if the relation has no physical
301 : * storage. This is mainly just for cleanliness' sake.
302 : */
303 536 : reltablespace = InvalidOid;
304 536 : break;
305 : case RELKIND_SEQUENCE:
306 136 : create_storage = true;
307 :
308 : /*
309 : * Force reltablespace to zero for sequences, since we don't
310 : * support moving them around into different tablespaces.
311 : */
312 136 : reltablespace = InvalidOid;
313 136 : break;
314 : default:
315 3703 : create_storage = true;
316 3703 : break;
317 : }
318 :
319 : /*
320 : * Unless otherwise requested, the physical ID (relfilenode) is initially
321 : * the same as the logical ID (OID). When the caller did specify a
322 : * relfilenode, it already exists; do not attempt to create it.
323 : */
324 4375 : if (OidIsValid(relfilenode))
325 7 : create_storage = false;
326 : else
327 4368 : relfilenode = relid;
328 :
329 : /*
330 : * Never allow a pg_class entry to explicitly specify the database's
331 : * default tablespace in reltablespace; force it to zero instead. This
332 : * ensures that if the database is cloned with a different default
333 : * tablespace, the pg_class entry will still match where CREATE DATABASE
334 : * will put the physically copied relation.
335 : *
336 : * Yes, this is a bit of a hack.
337 : */
338 4375 : if (reltablespace == MyDatabaseTableSpace)
339 7 : reltablespace = InvalidOid;
340 :
341 : /*
342 : * build the relcache entry.
343 : */
344 4375 : rel = RelationBuildLocalRelation(relname,
345 : relnamespace,
346 : tupDesc,
347 : relid,
348 : relfilenode,
349 : reltablespace,
350 : shared_relation,
351 : mapped_relation,
352 : relpersistence,
353 : relkind);
354 :
355 : /*
356 : * Have the storage manager create the relation's disk file, if needed.
357 : *
358 : * We only create the main fork here, other forks will be created on
359 : * demand.
360 : */
361 4375 : if (create_storage)
362 : {
363 3832 : RelationOpenSmgr(rel);
364 3832 : RelationCreateStorage(rel->rd_node, relpersistence);
365 : }
366 :
367 4375 : return rel;
368 : }
369 :
370 : /* ----------------------------------------------------------------
371 : * heap_create_with_catalog - Create a cataloged relation
372 : *
373 : * this is done in multiple steps:
374 : *
375 : * 1) CheckAttributeNamesTypes() is used to make certain the tuple
376 : * descriptor contains a valid set of attribute names and types
377 : *
378 : * 2) pg_class is opened and get_relname_relid()
379 : * performs a scan to ensure that no relation with the
380 : * same name already exists.
381 : *
382 : * 3) heap_create() is called to create the new relation on disk.
383 : *
384 : * 4) TypeCreate() is called to define a new type corresponding
385 : * to the new relation.
386 : *
387 : * 5) AddNewRelationTuple() is called to register the
388 : * relation in pg_class.
389 : *
390 : * 6) AddNewAttributeTuples() is called to register the
391 : * new relation's schema in pg_attribute.
392 : *
393 : * 7) StoreConstraints is called () - vadim 08/22/97
394 : *
395 : * 8) the relations are closed and the new relation's oid
396 : * is returned.
397 : *
398 : * ----------------------------------------------------------------
399 : */
400 :
401 : /* --------------------------------
402 : * CheckAttributeNamesTypes
403 : *
404 : * this is used to make certain the tuple descriptor contains a
405 : * valid set of attribute names and datatypes. a problem simply
406 : * generates ereport(ERROR) which aborts the current transaction.
407 : * --------------------------------
408 : */
409 : void
410 3051 : CheckAttributeNamesTypes(TupleDesc tupdesc, char relkind,
411 : bool allow_system_table_mods)
412 : {
413 : int i;
414 : int j;
415 3051 : int natts = tupdesc->natts;
416 :
417 : /* Sanity check on column count */
418 3051 : if (natts < 0 || natts > MaxHeapAttributeNumber)
419 0 : ereport(ERROR,
420 : (errcode(ERRCODE_TOO_MANY_COLUMNS),
421 : errmsg("tables can have at most %d columns",
422 : MaxHeapAttributeNumber)));
423 :
424 : /*
425 : * first check for collision with system attribute names
426 : *
427 : * Skip this for a view or type relation, since those don't have system
428 : * attributes.
429 : */
430 3051 : if (relkind != RELKIND_VIEW && relkind != RELKIND_COMPOSITE_TYPE)
431 : {
432 9210 : for (i = 0; i < natts; i++)
433 : {
434 6639 : Form_pg_attribute attr = TupleDescAttr(tupdesc, i);
435 :
436 6639 : if (SystemAttributeByName(NameStr(attr->attname),
437 6639 : tupdesc->tdhasoid) != NULL)
438 0 : ereport(ERROR,
439 : (errcode(ERRCODE_DUPLICATE_COLUMN),
440 : errmsg("column name \"%s\" conflicts with a system column name",
441 : NameStr(attr->attname))));
442 : }
443 : }
444 :
445 : /*
446 : * next check for repeated attribute names
447 : */
448 8758 : for (i = 1; i < natts; i++)
449 : {
450 29409 : for (j = 0; j < i; j++)
451 : {
452 23702 : if (strcmp(NameStr(TupleDescAttr(tupdesc, j)->attname),
453 23702 : NameStr(TupleDescAttr(tupdesc, i)->attname)) == 0)
454 0 : ereport(ERROR,
455 : (errcode(ERRCODE_DUPLICATE_COLUMN),
456 : errmsg("column name \"%s\" specified more than once",
457 : NameStr(TupleDescAttr(tupdesc, j)->attname))));
458 : }
459 : }
460 :
461 : /*
462 : * next check the attribute types
463 : */
464 11799 : for (i = 0; i < natts; i++)
465 : {
466 8750 : CheckAttributeType(NameStr(TupleDescAttr(tupdesc, i)->attname),
467 : TupleDescAttr(tupdesc, i)->atttypid,
468 : TupleDescAttr(tupdesc, i)->attcollation,
469 : NIL, /* assume we're creating a new rowtype */
470 : allow_system_table_mods);
471 : }
472 3049 : }
473 :
474 : /* --------------------------------
475 : * CheckAttributeType
476 : *
477 : * Verify that the proposed datatype of an attribute is legal.
478 : * This is needed mainly because there are types (and pseudo-types)
479 : * in the catalogs that we do not support as elements of real tuples.
480 : * We also check some other properties required of a table column.
481 : *
482 : * If the attribute is being proposed for addition to an existing table or
483 : * composite type, pass a one-element list of the rowtype OID as
484 : * containing_rowtypes. When checking a to-be-created rowtype, it's
485 : * sufficient to pass NIL, because there could not be any recursive reference
486 : * to a not-yet-existing rowtype.
487 : * --------------------------------
488 : */
489 : void
490 10049 : CheckAttributeType(const char *attname,
491 : Oid atttypid, Oid attcollation,
492 : List *containing_rowtypes,
493 : bool allow_system_table_mods)
494 : {
495 10049 : char att_typtype = get_typtype(atttypid);
496 : Oid att_typelem;
497 :
498 10049 : if (att_typtype == TYPTYPE_PSEUDO)
499 : {
500 : /*
501 : * Refuse any attempt to create a pseudo-type column, except for a
502 : * special hack for pg_statistic: allow ANYARRAY when modifying system
503 : * catalogs (this allows creating pg_statistic and cloning it during
504 : * VACUUM FULL)
505 : */
506 10 : if (atttypid != ANYARRAYOID || !allow_system_table_mods)
507 2 : ereport(ERROR,
508 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
509 : errmsg("column \"%s\" has pseudo-type %s",
510 : attname, format_type_be(atttypid))));
511 : }
512 10039 : else if (att_typtype == TYPTYPE_DOMAIN)
513 : {
514 : /*
515 : * If it's a domain, recurse to check its base type.
516 : */
517 719 : CheckAttributeType(attname, getBaseType(atttypid), attcollation,
518 : containing_rowtypes,
519 : allow_system_table_mods);
520 : }
521 9320 : else if (att_typtype == TYPTYPE_COMPOSITE)
522 : {
523 : /*
524 : * For a composite type, recurse into its attributes.
525 : */
526 : Relation relation;
527 : TupleDesc tupdesc;
528 : int i;
529 :
530 : /*
531 : * Check for self-containment. Eventually we might be able to allow
532 : * this (just return without complaint, if so) but it's not clear how
533 : * many other places would require anti-recursion defenses before it
534 : * would be safe to allow tables to contain their own rowtype.
535 : */
536 47 : if (list_member_oid(containing_rowtypes, atttypid))
537 5 : ereport(ERROR,
538 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
539 : errmsg("composite type %s cannot be made a member of itself",
540 : format_type_be(atttypid))));
541 :
542 42 : containing_rowtypes = lcons_oid(atttypid, containing_rowtypes);
543 :
544 42 : relation = relation_open(get_typ_typrelid(atttypid), AccessShareLock);
545 :
546 42 : tupdesc = RelationGetDescr(relation);
547 :
548 133 : for (i = 0; i < tupdesc->natts; i++)
549 : {
550 93 : Form_pg_attribute attr = TupleDescAttr(tupdesc, i);
551 :
552 93 : if (attr->attisdropped)
553 0 : continue;
554 93 : CheckAttributeType(NameStr(attr->attname),
555 : attr->atttypid, attr->attcollation,
556 : containing_rowtypes,
557 : allow_system_table_mods);
558 : }
559 :
560 40 : relation_close(relation, AccessShareLock);
561 :
562 40 : containing_rowtypes = list_delete_first(containing_rowtypes);
563 : }
564 9273 : else if (OidIsValid((att_typelem = get_element_type(atttypid))))
565 : {
566 : /*
567 : * Must recurse into array types, too, in case they are composite.
568 : */
569 188 : CheckAttributeType(attname, att_typelem, attcollation,
570 : containing_rowtypes,
571 : allow_system_table_mods);
572 : }
573 :
574 : /*
575 : * This might not be strictly invalid per SQL standard, but it is pretty
576 : * useless, and it cannot be dumped, so we must disallow it.
577 : */
578 10037 : if (!OidIsValid(attcollation) && type_is_collatable(atttypid))
579 0 : ereport(ERROR,
580 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
581 : errmsg("no collation was derived for column \"%s\" with collatable type %s",
582 : attname, format_type_be(atttypid)),
583 : errhint("Use the COLLATE clause to set the collation explicitly.")));
584 10037 : }
585 :
586 : /*
587 : * InsertPgAttributeTuple
588 : * Construct and insert a new tuple in pg_attribute.
589 : *
590 : * Caller has already opened and locked pg_attribute. new_attribute is the
591 : * attribute to insert (but we ignore attacl and attoptions, which are always
592 : * initialized to NULL).
593 : *
594 : * indstate is the index state for CatalogTupleInsertWithInfo. It can be
595 : * passed as NULL, in which case we'll fetch the necessary info. (Don't do
596 : * this when inserting multiple attributes, because it's a tad more
597 : * expensive.)
598 : */
599 : void
600 26555 : InsertPgAttributeTuple(Relation pg_attribute_rel,
601 : Form_pg_attribute new_attribute,
602 : CatalogIndexState indstate)
603 : {
604 : Datum values[Natts_pg_attribute];
605 : bool nulls[Natts_pg_attribute];
606 : HeapTuple tup;
607 :
608 : /* This is a tad tedious, but way cleaner than what we used to do... */
609 26555 : memset(values, 0, sizeof(values));
610 26555 : memset(nulls, false, sizeof(nulls));
611 :
612 26555 : values[Anum_pg_attribute_attrelid - 1] = ObjectIdGetDatum(new_attribute->attrelid);
613 26555 : values[Anum_pg_attribute_attname - 1] = NameGetDatum(&new_attribute->attname);
614 26555 : values[Anum_pg_attribute_atttypid - 1] = ObjectIdGetDatum(new_attribute->atttypid);
615 26555 : values[Anum_pg_attribute_attstattarget - 1] = Int32GetDatum(new_attribute->attstattarget);
616 26555 : values[Anum_pg_attribute_attlen - 1] = Int16GetDatum(new_attribute->attlen);
617 26555 : values[Anum_pg_attribute_attnum - 1] = Int16GetDatum(new_attribute->attnum);
618 26555 : values[Anum_pg_attribute_attndims - 1] = Int32GetDatum(new_attribute->attndims);
619 26555 : values[Anum_pg_attribute_attcacheoff - 1] = Int32GetDatum(new_attribute->attcacheoff);
620 26555 : values[Anum_pg_attribute_atttypmod - 1] = Int32GetDatum(new_attribute->atttypmod);
621 26555 : values[Anum_pg_attribute_attbyval - 1] = BoolGetDatum(new_attribute->attbyval);
622 26555 : values[Anum_pg_attribute_attstorage - 1] = CharGetDatum(new_attribute->attstorage);
623 26555 : values[Anum_pg_attribute_attalign - 1] = CharGetDatum(new_attribute->attalign);
624 26555 : values[Anum_pg_attribute_attnotnull - 1] = BoolGetDatum(new_attribute->attnotnull);
625 26555 : values[Anum_pg_attribute_atthasdef - 1] = BoolGetDatum(new_attribute->atthasdef);
626 26555 : values[Anum_pg_attribute_attidentity - 1] = CharGetDatum(new_attribute->attidentity);
627 26555 : values[Anum_pg_attribute_attisdropped - 1] = BoolGetDatum(new_attribute->attisdropped);
628 26555 : values[Anum_pg_attribute_attislocal - 1] = BoolGetDatum(new_attribute->attislocal);
629 26555 : values[Anum_pg_attribute_attinhcount - 1] = Int32GetDatum(new_attribute->attinhcount);
630 26555 : values[Anum_pg_attribute_attcollation - 1] = ObjectIdGetDatum(new_attribute->attcollation);
631 :
632 : /* start out with empty permissions and empty options */
633 26555 : nulls[Anum_pg_attribute_attacl - 1] = true;
634 26555 : nulls[Anum_pg_attribute_attoptions - 1] = true;
635 26555 : nulls[Anum_pg_attribute_attfdwoptions - 1] = true;
636 :
637 26555 : tup = heap_form_tuple(RelationGetDescr(pg_attribute_rel), values, nulls);
638 :
639 : /* finally insert the new tuple, update the indexes, and clean up */
640 26555 : if (indstate != NULL)
641 26377 : CatalogTupleInsertWithInfo(pg_attribute_rel, tup, indstate);
642 : else
643 178 : CatalogTupleInsert(pg_attribute_rel, tup);
644 :
645 26555 : heap_freetuple(tup);
646 26555 : }
647 :
648 : /* --------------------------------
649 : * AddNewAttributeTuples
650 : *
651 : * this registers the new relation's schema by adding
652 : * tuples to pg_attribute.
653 : * --------------------------------
654 : */
655 : static void
656 2999 : AddNewAttributeTuples(Oid new_rel_oid,
657 : TupleDesc tupdesc,
658 : char relkind,
659 : bool oidislocal,
660 : int oidinhcount)
661 : {
662 : Form_pg_attribute attr;
663 : int i;
664 : Relation rel;
665 : CatalogIndexState indstate;
666 2999 : int natts = tupdesc->natts;
667 : ObjectAddress myself,
668 : referenced;
669 :
670 : /*
671 : * open pg_attribute and its indexes.
672 : */
673 2999 : rel = heap_open(AttributeRelationId, RowExclusiveLock);
674 :
675 2999 : indstate = CatalogOpenIndexes(rel);
676 :
677 : /*
678 : * First we add the user attributes. This is also a convenient place to
679 : * add dependencies on their datatypes and collations.
680 : */
681 11600 : for (i = 0; i < natts; i++)
682 : {
683 8601 : attr = TupleDescAttr(tupdesc, i);
684 : /* Fill in the correct relation OID */
685 8601 : attr->attrelid = new_rel_oid;
686 : /* Make sure these are OK, too */
687 8601 : attr->attstattarget = -1;
688 8601 : attr->attcacheoff = -1;
689 :
690 8601 : InsertPgAttributeTuple(rel, attr, indstate);
691 :
692 : /* Add dependency info */
693 8601 : myself.classId = RelationRelationId;
694 8601 : myself.objectId = new_rel_oid;
695 8601 : myself.objectSubId = i + 1;
696 8601 : referenced.classId = TypeRelationId;
697 8601 : referenced.objectId = attr->atttypid;
698 8601 : referenced.objectSubId = 0;
699 8601 : recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
700 :
701 : /* The default collation is pinned, so don't bother recording it */
702 10359 : if (OidIsValid(attr->attcollation) &&
703 1758 : attr->attcollation != DEFAULT_COLLATION_OID)
704 : {
705 26 : referenced.classId = CollationRelationId;
706 26 : referenced.objectId = attr->attcollation;
707 26 : referenced.objectSubId = 0;
708 26 : recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
709 : }
710 : }
711 :
712 : /*
713 : * Next we add the system attributes. Skip OID if rel has no OIDs. Skip
714 : * all for a view or type relation. We don't bother with making datatype
715 : * dependencies here, since presumably all these types are pinned.
716 : */
717 2999 : if (relkind != RELKIND_VIEW && relkind != RELKIND_COMPOSITE_TYPE)
718 : {
719 20536 : for (i = 0; i < (int) lengthof(SysAtt); i++)
720 : {
721 : FormData_pg_attribute attStruct;
722 :
723 : /* skip OID where appropriate */
724 35336 : if (!tupdesc->tdhasoid &&
725 17367 : SysAtt[i]->attnum == ObjectIdAttributeNumber)
726 2481 : continue;
727 :
728 15488 : memcpy(&attStruct, (char *) SysAtt[i], sizeof(FormData_pg_attribute));
729 :
730 : /* Fill in the correct relation OID in the copied tuple */
731 15488 : attStruct.attrelid = new_rel_oid;
732 :
733 : /* Fill in correct inheritance info for the OID column */
734 15488 : if (attStruct.attnum == ObjectIdAttributeNumber)
735 : {
736 86 : attStruct.attislocal = oidislocal;
737 86 : attStruct.attinhcount = oidinhcount;
738 : }
739 :
740 15488 : InsertPgAttributeTuple(rel, &attStruct, indstate);
741 : }
742 : }
743 :
744 : /*
745 : * clean up
746 : */
747 2999 : CatalogCloseIndexes(indstate);
748 :
749 2999 : heap_close(rel, RowExclusiveLock);
750 2999 : }
751 :
752 : /* --------------------------------
753 : * InsertPgClassTuple
754 : *
755 : * Construct and insert a new tuple in pg_class.
756 : *
757 : * Caller has already opened and locked pg_class.
758 : * Tuple data is taken from new_rel_desc->rd_rel, except for the
759 : * variable-width fields which are not present in a cached reldesc.
760 : * relacl and reloptions are passed in Datum form (to avoid having
761 : * to reference the data types in heap.h). Pass (Datum) 0 to set them
762 : * to NULL.
763 : * --------------------------------
764 : */
765 : void
766 4371 : InsertPgClassTuple(Relation pg_class_desc,
767 : Relation new_rel_desc,
768 : Oid new_rel_oid,
769 : Datum relacl,
770 : Datum reloptions)
771 : {
772 4371 : Form_pg_class rd_rel = new_rel_desc->rd_rel;
773 : Datum values[Natts_pg_class];
774 : bool nulls[Natts_pg_class];
775 : HeapTuple tup;
776 :
777 : /* This is a tad tedious, but way cleaner than what we used to do... */
778 4371 : memset(values, 0, sizeof(values));
779 4371 : memset(nulls, false, sizeof(nulls));
780 :
781 4371 : values[Anum_pg_class_relname - 1] = NameGetDatum(&rd_rel->relname);
782 4371 : values[Anum_pg_class_relnamespace - 1] = ObjectIdGetDatum(rd_rel->relnamespace);
783 4371 : values[Anum_pg_class_reltype - 1] = ObjectIdGetDatum(rd_rel->reltype);
784 4371 : values[Anum_pg_class_reloftype - 1] = ObjectIdGetDatum(rd_rel->reloftype);
785 4371 : values[Anum_pg_class_relowner - 1] = ObjectIdGetDatum(rd_rel->relowner);
786 4371 : values[Anum_pg_class_relam - 1] = ObjectIdGetDatum(rd_rel->relam);
787 4371 : values[Anum_pg_class_relfilenode - 1] = ObjectIdGetDatum(rd_rel->relfilenode);
788 4371 : values[Anum_pg_class_reltablespace - 1] = ObjectIdGetDatum(rd_rel->reltablespace);
789 4371 : values[Anum_pg_class_relpages - 1] = Int32GetDatum(rd_rel->relpages);
790 4371 : values[Anum_pg_class_reltuples - 1] = Float4GetDatum(rd_rel->reltuples);
791 4371 : values[Anum_pg_class_relallvisible - 1] = Int32GetDatum(rd_rel->relallvisible);
792 4371 : values[Anum_pg_class_reltoastrelid - 1] = ObjectIdGetDatum(rd_rel->reltoastrelid);
793 4371 : values[Anum_pg_class_relhasindex - 1] = BoolGetDatum(rd_rel->relhasindex);
794 4371 : values[Anum_pg_class_relisshared - 1] = BoolGetDatum(rd_rel->relisshared);
795 4371 : values[Anum_pg_class_relpersistence - 1] = CharGetDatum(rd_rel->relpersistence);
796 4371 : values[Anum_pg_class_relkind - 1] = CharGetDatum(rd_rel->relkind);
797 4371 : values[Anum_pg_class_relnatts - 1] = Int16GetDatum(rd_rel->relnatts);
798 4371 : values[Anum_pg_class_relchecks - 1] = Int16GetDatum(rd_rel->relchecks);
799 4371 : values[Anum_pg_class_relhasoids - 1] = BoolGetDatum(rd_rel->relhasoids);
800 4371 : values[Anum_pg_class_relhaspkey - 1] = BoolGetDatum(rd_rel->relhaspkey);
801 4371 : values[Anum_pg_class_relhasrules - 1] = BoolGetDatum(rd_rel->relhasrules);
802 4371 : values[Anum_pg_class_relhastriggers - 1] = BoolGetDatum(rd_rel->relhastriggers);
803 4371 : values[Anum_pg_class_relrowsecurity - 1] = BoolGetDatum(rd_rel->relrowsecurity);
804 4371 : values[Anum_pg_class_relforcerowsecurity - 1] = BoolGetDatum(rd_rel->relforcerowsecurity);
805 4371 : values[Anum_pg_class_relhassubclass - 1] = BoolGetDatum(rd_rel->relhassubclass);
806 4371 : values[Anum_pg_class_relispopulated - 1] = BoolGetDatum(rd_rel->relispopulated);
807 4371 : values[Anum_pg_class_relreplident - 1] = CharGetDatum(rd_rel->relreplident);
808 4371 : values[Anum_pg_class_relispartition - 1] = BoolGetDatum(rd_rel->relispartition);
809 4371 : values[Anum_pg_class_relfrozenxid - 1] = TransactionIdGetDatum(rd_rel->relfrozenxid);
810 4371 : values[Anum_pg_class_relminmxid - 1] = MultiXactIdGetDatum(rd_rel->relminmxid);
811 4371 : if (relacl != (Datum) 0)
812 13 : values[Anum_pg_class_relacl - 1] = relacl;
813 : else
814 4358 : nulls[Anum_pg_class_relacl - 1] = true;
815 4371 : if (reloptions != (Datum) 0)
816 54 : values[Anum_pg_class_reloptions - 1] = reloptions;
817 : else
818 4317 : nulls[Anum_pg_class_reloptions - 1] = true;
819 :
820 : /* relpartbound is set by updating this tuple, if necessary */
821 4371 : nulls[Anum_pg_class_relpartbound - 1] = true;
822 :
823 4371 : tup = heap_form_tuple(RelationGetDescr(pg_class_desc), values, nulls);
824 :
825 : /*
826 : * The new tuple must have the oid already chosen for the rel. Sure would
827 : * be embarrassing to do this sort of thing in polite company.
828 : */
829 4371 : HeapTupleSetOid(tup, new_rel_oid);
830 :
831 : /* finally insert the new tuple, update the indexes, and clean up */
832 4371 : CatalogTupleInsert(pg_class_desc, tup);
833 :
834 4371 : heap_freetuple(tup);
835 4371 : }
836 :
837 : /* --------------------------------
838 : * AddNewRelationTuple
839 : *
840 : * this registers the new relation in the catalogs by
841 : * adding a tuple to pg_class.
842 : * --------------------------------
843 : */
844 : static void
845 2999 : AddNewRelationTuple(Relation pg_class_desc,
846 : Relation new_rel_desc,
847 : Oid new_rel_oid,
848 : Oid new_type_oid,
849 : Oid reloftype,
850 : Oid relowner,
851 : char relkind,
852 : Datum relacl,
853 : Datum reloptions)
854 : {
855 : Form_pg_class new_rel_reltup;
856 :
857 : /*
858 : * first we update some of the information in our uncataloged relation's
859 : * relation descriptor.
860 : */
861 2999 : new_rel_reltup = new_rel_desc->rd_rel;
862 :
863 2999 : switch (relkind)
864 : {
865 : case RELKIND_RELATION:
866 : case RELKIND_MATVIEW:
867 : case RELKIND_INDEX:
868 : case RELKIND_TOASTVALUE:
869 : /* The relation is real, but as yet empty */
870 2327 : new_rel_reltup->relpages = 0;
871 2327 : new_rel_reltup->reltuples = 0;
872 2327 : new_rel_reltup->relallvisible = 0;
873 2327 : break;
874 : case RELKIND_SEQUENCE:
875 : /* Sequences always have a known size */
876 136 : new_rel_reltup->relpages = 1;
877 136 : new_rel_reltup->reltuples = 1;
878 136 : new_rel_reltup->relallvisible = 0;
879 136 : break;
880 : default:
881 : /* Views, etc, have no disk storage */
882 536 : new_rel_reltup->relpages = 0;
883 536 : new_rel_reltup->reltuples = 0;
884 536 : new_rel_reltup->relallvisible = 0;
885 536 : break;
886 : }
887 :
888 : /* Initialize relfrozenxid and relminmxid */
889 2999 : if (relkind == RELKIND_RELATION ||
890 1367 : relkind == RELKIND_MATVIEW ||
891 : relkind == RELKIND_TOASTVALUE)
892 : {
893 : /*
894 : * Initialize to the minimum XID that could put tuples in the table.
895 : * We know that no xacts older than RecentXmin are still running, so
896 : * that will do.
897 : */
898 2327 : new_rel_reltup->relfrozenxid = RecentXmin;
899 :
900 : /*
901 : * Similarly, initialize the minimum Multixact to the first value that
902 : * could possibly be stored in tuples in the table. Running
903 : * transactions could reuse values from their local cache, so we are
904 : * careful to consider all currently running multis.
905 : *
906 : * XXX this could be refined further, but is it worth the hassle?
907 : */
908 2327 : new_rel_reltup->relminmxid = GetOldestMultiXactId();
909 : }
910 : else
911 : {
912 : /*
913 : * Other relation types will not contain XIDs, so set relfrozenxid to
914 : * InvalidTransactionId. (Note: a sequence does contain a tuple, but
915 : * we force its xmin to be FrozenTransactionId always; see
916 : * commands/sequence.c.)
917 : */
918 672 : new_rel_reltup->relfrozenxid = InvalidTransactionId;
919 672 : new_rel_reltup->relminmxid = InvalidMultiXactId;
920 : }
921 :
922 2999 : new_rel_reltup->relowner = relowner;
923 2999 : new_rel_reltup->reltype = new_type_oid;
924 2999 : new_rel_reltup->reloftype = reloftype;
925 :
926 : /* relispartition is always set by updating this tuple later */
927 2999 : new_rel_reltup->relispartition = false;
928 :
929 2999 : new_rel_desc->rd_att->tdtypeid = new_type_oid;
930 :
931 : /* Now build and insert the tuple */
932 2999 : InsertPgClassTuple(pg_class_desc, new_rel_desc, new_rel_oid,
933 : relacl, reloptions);
934 2999 : }
935 :
936 :
937 : /* --------------------------------
938 : * AddNewRelationType -
939 : *
940 : * define a composite type corresponding to the new relation
941 : * --------------------------------
942 : */
943 : static ObjectAddress
944 2999 : AddNewRelationType(const char *typeName,
945 : Oid typeNamespace,
946 : Oid new_rel_oid,
947 : char new_rel_kind,
948 : Oid ownerid,
949 : Oid new_row_type,
950 : Oid new_array_type)
951 : {
952 2999 : return
953 2999 : TypeCreate(new_row_type, /* optional predetermined OID */
954 : typeName, /* type name */
955 : typeNamespace, /* type namespace */
956 : new_rel_oid, /* relation oid */
957 : new_rel_kind, /* relation kind */
958 : ownerid, /* owner's ID */
959 : -1, /* internal size (varlena) */
960 : TYPTYPE_COMPOSITE, /* type-type (composite) */
961 : TYPCATEGORY_COMPOSITE, /* type-category (ditto) */
962 : false, /* composite types are never preferred */
963 : DEFAULT_TYPDELIM, /* default array delimiter */
964 : F_RECORD_IN, /* input procedure */
965 : F_RECORD_OUT, /* output procedure */
966 : F_RECORD_RECV, /* receive procedure */
967 : F_RECORD_SEND, /* send procedure */
968 : InvalidOid, /* typmodin procedure - none */
969 : InvalidOid, /* typmodout procedure - none */
970 : InvalidOid, /* analyze procedure - default */
971 : InvalidOid, /* array element type - irrelevant */
972 : false, /* this is not an array type */
973 : new_array_type, /* array type if any */
974 : InvalidOid, /* domain base type - irrelevant */
975 : NULL, /* default value - none */
976 : NULL, /* default binary representation */
977 : false, /* passed by reference */
978 : 'd', /* alignment - must be the largest! */
979 : 'x', /* fully TOASTable */
980 : -1, /* typmod */
981 : 0, /* array dimensions for typBaseType */
982 : false, /* Type NOT NULL */
983 : InvalidOid); /* rowtypes never have a collation */
984 : }
985 :
986 : /* --------------------------------
987 : * heap_create_with_catalog
988 : *
989 : * creates a new cataloged relation. see comments above.
990 : *
991 : * Arguments:
992 : * relname: name to give to new rel
993 : * relnamespace: OID of namespace it goes in
994 : * reltablespace: OID of tablespace it goes in
995 : * relid: OID to assign to new rel, or InvalidOid to select a new OID
996 : * reltypeid: OID to assign to rel's rowtype, or InvalidOid to select one
997 : * reloftypeid: if a typed table, OID of underlying type; else InvalidOid
998 : * ownerid: OID of new rel's owner
999 : * tupdesc: tuple descriptor (source of column definitions)
1000 : * cooked_constraints: list of precooked check constraints and defaults
1001 : * relkind: relkind for new rel
1002 : * relpersistence: rel's persistence status (permanent, temp, or unlogged)
1003 : * shared_relation: TRUE if it's to be a shared relation
1004 : * mapped_relation: TRUE if the relation will use the relfilenode map
1005 : * oidislocal: TRUE if oid column (if any) should be marked attislocal
1006 : * oidinhcount: attinhcount to assign to oid column (if any)
1007 : * oncommit: ON COMMIT marking (only relevant if it's a temp table)
1008 : * reloptions: reloptions in Datum form, or (Datum) 0 if none
1009 : * use_user_acl: TRUE if should look for user-defined default permissions;
1010 : * if FALSE, relacl is always set NULL
1011 : * allow_system_table_mods: TRUE to allow creation in system namespaces
1012 : * is_internal: is this a system-generated catalog?
1013 : *
1014 : * Output parameters:
1015 : * typaddress: if not null, gets the object address of the new pg_type entry
1016 : *
1017 : * Returns the OID of the new relation
1018 : * --------------------------------
1019 : */
1020 : Oid
1021 3004 : heap_create_with_catalog(const char *relname,
1022 : Oid relnamespace,
1023 : Oid reltablespace,
1024 : Oid relid,
1025 : Oid reltypeid,
1026 : Oid reloftypeid,
1027 : Oid ownerid,
1028 : TupleDesc tupdesc,
1029 : List *cooked_constraints,
1030 : char relkind,
1031 : char relpersistence,
1032 : bool shared_relation,
1033 : bool mapped_relation,
1034 : bool oidislocal,
1035 : int oidinhcount,
1036 : OnCommitAction oncommit,
1037 : Datum reloptions,
1038 : bool use_user_acl,
1039 : bool allow_system_table_mods,
1040 : bool is_internal,
1041 : ObjectAddress *typaddress)
1042 : {
1043 : Relation pg_class_desc;
1044 : Relation new_rel_desc;
1045 : Acl *relacl;
1046 : Oid existing_relid;
1047 : Oid old_type_oid;
1048 : Oid new_type_oid;
1049 : ObjectAddress new_type_addr;
1050 3004 : Oid new_array_oid = InvalidOid;
1051 :
1052 3004 : pg_class_desc = heap_open(RelationRelationId, RowExclusiveLock);
1053 :
1054 : /*
1055 : * sanity checks
1056 : */
1057 3004 : Assert(IsNormalProcessingMode() || IsBootstrapProcessingMode());
1058 :
1059 3004 : CheckAttributeNamesTypes(tupdesc, relkind, allow_system_table_mods);
1060 :
1061 : /*
1062 : * This would fail later on anyway, if the relation already exists. But
1063 : * by catching it here we can emit a nicer error message.
1064 : */
1065 3002 : existing_relid = get_relname_relid(relname, relnamespace);
1066 3002 : if (existing_relid != InvalidOid)
1067 2 : ereport(ERROR,
1068 : (errcode(ERRCODE_DUPLICATE_TABLE),
1069 : errmsg("relation \"%s\" already exists", relname)));
1070 :
1071 : /*
1072 : * Since we are going to create a rowtype as well, also check for
1073 : * collision with an existing type name. If there is one and it's an
1074 : * autogenerated array, we can rename it out of the way; otherwise we can
1075 : * at least give a good error message.
1076 : */
1077 3000 : old_type_oid = GetSysCacheOid2(TYPENAMENSP,
1078 : CStringGetDatum(relname),
1079 : ObjectIdGetDatum(relnamespace));
1080 3000 : if (OidIsValid(old_type_oid))
1081 : {
1082 0 : if (!moveArrayTypeName(old_type_oid, relname, relnamespace))
1083 0 : ereport(ERROR,
1084 : (errcode(ERRCODE_DUPLICATE_OBJECT),
1085 : errmsg("type \"%s\" already exists", relname),
1086 : errhint("A relation has an associated type of the same name, "
1087 : "so you must use a name that doesn't conflict "
1088 : "with any existing type.")));
1089 : }
1090 :
1091 : /*
1092 : * Shared relations must be in pg_global (last-ditch check)
1093 : */
1094 3000 : if (shared_relation && reltablespace != GLOBALTABLESPACE_OID)
1095 0 : elog(ERROR, "shared relations must be placed in pg_global tablespace");
1096 :
1097 : /*
1098 : * Allocate an OID for the relation, unless we were told what to use.
1099 : *
1100 : * The OID will be the relfilenode as well, so make sure it doesn't
1101 : * collide with either pg_class OIDs or existing physical files.
1102 : */
1103 3000 : if (!OidIsValid(relid))
1104 : {
1105 : /* Use binary-upgrade override for pg_class.oid/relfilenode? */
1106 2930 : if (IsBinaryUpgrade &&
1107 0 : (relkind == RELKIND_RELATION || relkind == RELKIND_SEQUENCE ||
1108 0 : relkind == RELKIND_VIEW || relkind == RELKIND_MATVIEW ||
1109 0 : relkind == RELKIND_COMPOSITE_TYPE || relkind == RELKIND_FOREIGN_TABLE ||
1110 : relkind == RELKIND_PARTITIONED_TABLE))
1111 : {
1112 0 : if (!OidIsValid(binary_upgrade_next_heap_pg_class_oid))
1113 0 : ereport(ERROR,
1114 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1115 : errmsg("pg_class heap OID value not set when in binary upgrade mode")));
1116 :
1117 0 : relid = binary_upgrade_next_heap_pg_class_oid;
1118 0 : binary_upgrade_next_heap_pg_class_oid = InvalidOid;
1119 : }
1120 : /* There might be no TOAST table, so we have to test for it. */
1121 2930 : else if (IsBinaryUpgrade &&
1122 0 : OidIsValid(binary_upgrade_next_toast_pg_class_oid) &&
1123 : relkind == RELKIND_TOASTVALUE)
1124 : {
1125 0 : relid = binary_upgrade_next_toast_pg_class_oid;
1126 0 : binary_upgrade_next_toast_pg_class_oid = InvalidOid;
1127 : }
1128 : else
1129 2930 : relid = GetNewRelFileNode(reltablespace, pg_class_desc,
1130 : relpersistence);
1131 : }
1132 :
1133 : /*
1134 : * Determine the relation's initial permissions.
1135 : */
1136 3000 : if (use_user_acl)
1137 : {
1138 2133 : switch (relkind)
1139 : {
1140 : case RELKIND_RELATION:
1141 : case RELKIND_VIEW:
1142 : case RELKIND_MATVIEW:
1143 : case RELKIND_FOREIGN_TABLE:
1144 : case RELKIND_PARTITIONED_TABLE:
1145 1948 : relacl = get_user_default_acl(ACL_OBJECT_RELATION, ownerid,
1146 : relnamespace);
1147 1948 : break;
1148 : case RELKIND_SEQUENCE:
1149 136 : relacl = get_user_default_acl(ACL_OBJECT_SEQUENCE, ownerid,
1150 : relnamespace);
1151 136 : break;
1152 : default:
1153 49 : relacl = NULL;
1154 49 : break;
1155 : }
1156 : }
1157 : else
1158 867 : relacl = NULL;
1159 :
1160 : /*
1161 : * Create the relcache entry (mostly dummy at this point) and the physical
1162 : * disk file. (If we fail further down, it's the smgr's responsibility to
1163 : * remove the disk file again.)
1164 : */
1165 3000 : new_rel_desc = heap_create(relname,
1166 : relnamespace,
1167 : reltablespace,
1168 : relid,
1169 : InvalidOid,
1170 : tupdesc,
1171 : relkind,
1172 : relpersistence,
1173 : shared_relation,
1174 : mapped_relation,
1175 : allow_system_table_mods);
1176 :
1177 2999 : Assert(relid == RelationGetRelid(new_rel_desc));
1178 :
1179 : /*
1180 : * Decide whether to create an array type over the relation's rowtype. We
1181 : * do not create any array types for system catalogs (ie, those made
1182 : * during initdb). We do not create them where the use of a relation as
1183 : * such is an implementation detail: toast tables, sequences and indexes.
1184 : */
1185 2999 : if (IsUnderPostmaster && (relkind == RELKIND_RELATION ||
1186 989 : relkind == RELKIND_VIEW ||
1187 963 : relkind == RELKIND_MATVIEW ||
1188 952 : relkind == RELKIND_FOREIGN_TABLE ||
1189 903 : relkind == RELKIND_COMPOSITE_TYPE ||
1190 : relkind == RELKIND_PARTITIONED_TABLE))
1191 1982 : new_array_oid = AssignTypeArrayOid();
1192 :
1193 : /*
1194 : * Since defining a relation also defines a complex type, we add a new
1195 : * system type corresponding to the new relation. The OID of the type can
1196 : * be preselected by the caller, but if reltypeid is InvalidOid, we'll
1197 : * generate a new OID for it.
1198 : *
1199 : * NOTE: we could get a unique-index failure here, in case someone else is
1200 : * creating the same type name in parallel but hadn't committed yet when
1201 : * we checked for a duplicate name above.
1202 : */
1203 2999 : new_type_addr = AddNewRelationType(relname,
1204 : relnamespace,
1205 : relid,
1206 : relkind,
1207 : ownerid,
1208 : reltypeid,
1209 : new_array_oid);
1210 2999 : new_type_oid = new_type_addr.objectId;
1211 2999 : if (typaddress)
1212 49 : *typaddress = new_type_addr;
1213 :
1214 : /*
1215 : * Now make the array type if wanted.
1216 : */
1217 2999 : if (OidIsValid(new_array_oid))
1218 : {
1219 : char *relarrayname;
1220 :
1221 1982 : relarrayname = makeArrayTypeName(relname, relnamespace);
1222 :
1223 1982 : TypeCreate(new_array_oid, /* force the type's OID to this */
1224 : relarrayname, /* Array type name */
1225 : relnamespace, /* Same namespace as parent */
1226 : InvalidOid, /* Not composite, no relationOid */
1227 : 0, /* relkind, also N/A here */
1228 : ownerid, /* owner's ID */
1229 : -1, /* Internal size (varlena) */
1230 : TYPTYPE_BASE, /* Not composite - typelem is */
1231 : TYPCATEGORY_ARRAY, /* type-category (array) */
1232 : false, /* array types are never preferred */
1233 : DEFAULT_TYPDELIM, /* default array delimiter */
1234 : F_ARRAY_IN, /* array input proc */
1235 : F_ARRAY_OUT, /* array output proc */
1236 : F_ARRAY_RECV, /* array recv (bin) proc */
1237 : F_ARRAY_SEND, /* array send (bin) proc */
1238 : InvalidOid, /* typmodin procedure - none */
1239 : InvalidOid, /* typmodout procedure - none */
1240 : F_ARRAY_TYPANALYZE, /* array analyze procedure */
1241 : new_type_oid, /* array element type - the rowtype */
1242 : true, /* yes, this is an array type */
1243 : InvalidOid, /* this has no array type */
1244 : InvalidOid, /* domain base type - irrelevant */
1245 : NULL, /* default value - none */
1246 : NULL, /* default binary representation */
1247 : false, /* passed by reference */
1248 : 'd', /* alignment - must be the largest! */
1249 : 'x', /* fully TOASTable */
1250 : -1, /* typmod */
1251 : 0, /* array dimensions for typBaseType */
1252 : false, /* Type NOT NULL */
1253 : InvalidOid); /* rowtypes never have a collation */
1254 :
1255 1982 : pfree(relarrayname);
1256 : }
1257 :
1258 : /*
1259 : * now create an entry in pg_class for the relation.
1260 : *
1261 : * NOTE: we could get a unique-index failure here, in case someone else is
1262 : * creating the same relation name in parallel but hadn't committed yet
1263 : * when we checked for a duplicate name above.
1264 : */
1265 2999 : AddNewRelationTuple(pg_class_desc,
1266 : new_rel_desc,
1267 : relid,
1268 : new_type_oid,
1269 : reloftypeid,
1270 : ownerid,
1271 : relkind,
1272 : PointerGetDatum(relacl),
1273 : reloptions);
1274 :
1275 : /*
1276 : * now add tuples to pg_attribute for the attributes in our new relation.
1277 : */
1278 2999 : AddNewAttributeTuples(relid, new_rel_desc->rd_att, relkind,
1279 : oidislocal, oidinhcount);
1280 :
1281 : /*
1282 : * Make a dependency link to force the relation to be deleted if its
1283 : * namespace is. Also make a dependency link to its owner, as well as
1284 : * dependencies for any roles mentioned in the default ACL.
1285 : *
1286 : * For composite types, these dependencies are tracked for the pg_type
1287 : * entry, so we needn't record them here. Likewise, TOAST tables don't
1288 : * need a namespace dependency (they live in a pinned namespace) nor an
1289 : * owner dependency (they depend indirectly through the parent table), nor
1290 : * should they have any ACL entries. The same applies for extension
1291 : * dependencies.
1292 : *
1293 : * Also, skip this in bootstrap mode, since we don't make dependencies
1294 : * while bootstrapping.
1295 : */
1296 2999 : if (relkind != RELKIND_COMPOSITE_TYPE &&
1297 2255 : relkind != RELKIND_TOASTVALUE &&
1298 2255 : !IsBootstrapProcessingMode())
1299 : {
1300 : ObjectAddress myself,
1301 : referenced;
1302 :
1303 2197 : myself.classId = RelationRelationId;
1304 2197 : myself.objectId = relid;
1305 2197 : myself.objectSubId = 0;
1306 2197 : referenced.classId = NamespaceRelationId;
1307 2197 : referenced.objectId = relnamespace;
1308 2197 : referenced.objectSubId = 0;
1309 2197 : recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
1310 :
1311 2197 : recordDependencyOnOwner(RelationRelationId, relid, ownerid);
1312 :
1313 2197 : recordDependencyOnCurrentExtension(&myself, false);
1314 :
1315 2197 : if (reloftypeid)
1316 : {
1317 11 : referenced.classId = TypeRelationId;
1318 11 : referenced.objectId = reloftypeid;
1319 11 : referenced.objectSubId = 0;
1320 11 : recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
1321 : }
1322 :
1323 2197 : if (relacl != NULL)
1324 : {
1325 : int nnewmembers;
1326 : Oid *newmembers;
1327 :
1328 13 : nnewmembers = aclmembers(relacl, &newmembers);
1329 13 : updateAclDependencies(RelationRelationId, relid, 0,
1330 : ownerid,
1331 : 0, NULL,
1332 : nnewmembers, newmembers);
1333 : }
1334 : }
1335 :
1336 : /* Post creation hook for new relation */
1337 2999 : InvokeObjectPostCreateHookArg(RelationRelationId, relid, 0, is_internal);
1338 :
1339 : /*
1340 : * Store any supplied constraints and defaults.
1341 : *
1342 : * NB: this may do a CommandCounterIncrement and rebuild the relcache
1343 : * entry, so the relation must be valid and self-consistent at this point.
1344 : * In particular, there are not yet constraints and defaults anywhere.
1345 : */
1346 2999 : StoreConstraints(new_rel_desc, cooked_constraints, is_internal);
1347 :
1348 : /*
1349 : * If there's a special on-commit action, remember it
1350 : */
1351 2999 : if (oncommit != ONCOMMIT_NOOP)
1352 8 : register_on_commit_action(relid, oncommit);
1353 :
1354 : /*
1355 : * Unlogged objects need an init fork, except for partitioned tables which
1356 : * have no storage at all.
1357 : */
1358 2999 : if (relpersistence == RELPERSISTENCE_UNLOGGED &&
1359 : relkind != RELKIND_PARTITIONED_TABLE)
1360 11 : heap_create_init_fork(new_rel_desc);
1361 :
1362 : /*
1363 : * ok, the relation has been cataloged, so close our relations and return
1364 : * the OID of the newly created relation.
1365 : */
1366 2999 : heap_close(new_rel_desc, NoLock); /* do not unlock till end of xact */
1367 2999 : heap_close(pg_class_desc, RowExclusiveLock);
1368 :
1369 2999 : return relid;
1370 : }
1371 :
1372 : /*
1373 : * Set up an init fork for an unlogged table so that it can be correctly
1374 : * reinitialized on restart. An immediate sync is required even if the
1375 : * page has been logged, because the write did not go through
1376 : * shared_buffers and therefore a concurrent checkpoint may have moved
1377 : * the redo pointer past our xlog record. Recovery may as well remove it
1378 : * while replaying, for example, XLOG_DBASE_CREATE or XLOG_TBLSPC_CREATE
1379 : * record. Therefore, logging is necessary even if wal_level=minimal.
1380 : */
1381 : void
1382 11 : heap_create_init_fork(Relation rel)
1383 : {
1384 11 : Assert(rel->rd_rel->relkind == RELKIND_RELATION ||
1385 : rel->rd_rel->relkind == RELKIND_MATVIEW ||
1386 : rel->rd_rel->relkind == RELKIND_TOASTVALUE);
1387 11 : RelationOpenSmgr(rel);
1388 11 : smgrcreate(rel->rd_smgr, INIT_FORKNUM, false);
1389 11 : log_smgrcreate(&rel->rd_smgr->smgr_rnode.node, INIT_FORKNUM);
1390 11 : smgrimmedsync(rel->rd_smgr, INIT_FORKNUM);
1391 11 : }
1392 :
1393 : /*
1394 : * RelationRemoveInheritance
1395 : *
1396 : * Formerly, this routine checked for child relations and aborted the
1397 : * deletion if any were found. Now we rely on the dependency mechanism
1398 : * to check for or delete child relations. By the time we get here,
1399 : * there are no children and we need only remove any pg_inherits rows
1400 : * linking this relation to its parent(s).
1401 : */
1402 : static void
1403 2146 : RelationRemoveInheritance(Oid relid)
1404 : {
1405 : Relation catalogRelation;
1406 : SysScanDesc scan;
1407 : ScanKeyData key;
1408 : HeapTuple tuple;
1409 :
1410 2146 : catalogRelation = heap_open(InheritsRelationId, RowExclusiveLock);
1411 :
1412 2146 : ScanKeyInit(&key,
1413 : Anum_pg_inherits_inhrelid,
1414 : BTEqualStrategyNumber, F_OIDEQ,
1415 : ObjectIdGetDatum(relid));
1416 :
1417 2146 : scan = systable_beginscan(catalogRelation, InheritsRelidSeqnoIndexId, true,
1418 : NULL, 1, &key);
1419 :
1420 4540 : while (HeapTupleIsValid(tuple = systable_getnext(scan)))
1421 248 : CatalogTupleDelete(catalogRelation, &tuple->t_self);
1422 :
1423 2146 : systable_endscan(scan);
1424 2146 : heap_close(catalogRelation, RowExclusiveLock);
1425 2146 : }
1426 :
1427 : /*
1428 : * DeleteRelationTuple
1429 : *
1430 : * Remove pg_class row for the given relid.
1431 : *
1432 : * Note: this is shared by relation deletion and index deletion. It's
1433 : * not intended for use anyplace else.
1434 : */
1435 : void
1436 3077 : DeleteRelationTuple(Oid relid)
1437 : {
1438 : Relation pg_class_desc;
1439 : HeapTuple tup;
1440 :
1441 : /* Grab an appropriate lock on the pg_class relation */
1442 3077 : pg_class_desc = heap_open(RelationRelationId, RowExclusiveLock);
1443 :
1444 3077 : tup = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
1445 3077 : if (!HeapTupleIsValid(tup))
1446 0 : elog(ERROR, "cache lookup failed for relation %u", relid);
1447 :
1448 : /* delete the relation tuple from pg_class, and finish up */
1449 3077 : CatalogTupleDelete(pg_class_desc, &tup->t_self);
1450 :
1451 3077 : ReleaseSysCache(tup);
1452 :
1453 3077 : heap_close(pg_class_desc, RowExclusiveLock);
1454 3077 : }
1455 :
1456 : /*
1457 : * DeleteAttributeTuples
1458 : *
1459 : * Remove pg_attribute rows for the given relid.
1460 : *
1461 : * Note: this is shared by relation deletion and index deletion. It's
1462 : * not intended for use anyplace else.
1463 : */
1464 : void
1465 3077 : DeleteAttributeTuples(Oid relid)
1466 : {
1467 : Relation attrel;
1468 : SysScanDesc scan;
1469 : ScanKeyData key[1];
1470 : HeapTuple atttup;
1471 :
1472 : /* Grab an appropriate lock on the pg_attribute relation */
1473 3077 : attrel = heap_open(AttributeRelationId, RowExclusiveLock);
1474 :
1475 : /* Use the index to scan only attributes of the target relation */
1476 3077 : ScanKeyInit(&key[0],
1477 : Anum_pg_attribute_attrelid,
1478 : BTEqualStrategyNumber, F_OIDEQ,
1479 : ObjectIdGetDatum(relid));
1480 :
1481 3077 : scan = systable_beginscan(attrel, AttributeRelidNumIndexId, true,
1482 : NULL, 1, key);
1483 :
1484 : /* Delete all the matching tuples */
1485 24359 : while ((atttup = systable_getnext(scan)) != NULL)
1486 18205 : CatalogTupleDelete(attrel, &atttup->t_self);
1487 :
1488 : /* Clean up after the scan */
1489 3077 : systable_endscan(scan);
1490 3077 : heap_close(attrel, RowExclusiveLock);
1491 3077 : }
1492 :
1493 : /*
1494 : * DeleteSystemAttributeTuples
1495 : *
1496 : * Remove pg_attribute rows for system columns of the given relid.
1497 : *
1498 : * Note: this is only used when converting a table to a view. Views don't
1499 : * have system columns, so we should remove them from pg_attribute.
1500 : */
1501 : void
1502 2 : DeleteSystemAttributeTuples(Oid relid)
1503 : {
1504 : Relation attrel;
1505 : SysScanDesc scan;
1506 : ScanKeyData key[2];
1507 : HeapTuple atttup;
1508 :
1509 : /* Grab an appropriate lock on the pg_attribute relation */
1510 2 : attrel = heap_open(AttributeRelationId, RowExclusiveLock);
1511 :
1512 : /* Use the index to scan only system attributes of the target relation */
1513 2 : ScanKeyInit(&key[0],
1514 : Anum_pg_attribute_attrelid,
1515 : BTEqualStrategyNumber, F_OIDEQ,
1516 : ObjectIdGetDatum(relid));
1517 2 : ScanKeyInit(&key[1],
1518 : Anum_pg_attribute_attnum,
1519 : BTLessEqualStrategyNumber, F_INT2LE,
1520 : Int16GetDatum(0));
1521 :
1522 2 : scan = systable_beginscan(attrel, AttributeRelidNumIndexId, true,
1523 : NULL, 2, key);
1524 :
1525 : /* Delete all the matching tuples */
1526 16 : while ((atttup = systable_getnext(scan)) != NULL)
1527 12 : CatalogTupleDelete(attrel, &atttup->t_self);
1528 :
1529 : /* Clean up after the scan */
1530 2 : systable_endscan(scan);
1531 2 : heap_close(attrel, RowExclusiveLock);
1532 2 : }
1533 :
1534 : /*
1535 : * RemoveAttributeById
1536 : *
1537 : * This is the guts of ALTER TABLE DROP COLUMN: actually mark the attribute
1538 : * deleted in pg_attribute. We also remove pg_statistic entries for it.
1539 : * (Everything else needed, such as getting rid of any pg_attrdef entry,
1540 : * is handled by dependency.c.)
1541 : */
1542 : void
1543 117 : RemoveAttributeById(Oid relid, AttrNumber attnum)
1544 : {
1545 : Relation rel;
1546 : Relation attr_rel;
1547 : HeapTuple tuple;
1548 : Form_pg_attribute attStruct;
1549 : char newattname[NAMEDATALEN];
1550 :
1551 : /*
1552 : * Grab an exclusive lock on the target table, which we will NOT release
1553 : * until end of transaction. (In the simple case where we are directly
1554 : * dropping this column, AlterTableDropColumn already did this ... but
1555 : * when cascading from a drop of some other object, we may not have any
1556 : * lock.)
1557 : */
1558 117 : rel = relation_open(relid, AccessExclusiveLock);
1559 :
1560 117 : attr_rel = heap_open(AttributeRelationId, RowExclusiveLock);
1561 :
1562 117 : tuple = SearchSysCacheCopy2(ATTNUM,
1563 : ObjectIdGetDatum(relid),
1564 : Int16GetDatum(attnum));
1565 117 : if (!HeapTupleIsValid(tuple)) /* shouldn't happen */
1566 0 : elog(ERROR, "cache lookup failed for attribute %d of relation %u",
1567 : attnum, relid);
1568 117 : attStruct = (Form_pg_attribute) GETSTRUCT(tuple);
1569 :
1570 117 : if (attnum < 0)
1571 : {
1572 : /* System attribute (probably OID) ... just delete the row */
1573 :
1574 11 : CatalogTupleDelete(attr_rel, &tuple->t_self);
1575 : }
1576 : else
1577 : {
1578 : /* Dropping user attributes is lots harder */
1579 :
1580 : /* Mark the attribute as dropped */
1581 106 : attStruct->attisdropped = true;
1582 :
1583 : /*
1584 : * Set the type OID to invalid. A dropped attribute's type link
1585 : * cannot be relied on (once the attribute is dropped, the type might
1586 : * be too). Fortunately we do not need the type row --- the only
1587 : * really essential information is the type's typlen and typalign,
1588 : * which are preserved in the attribute's attlen and attalign. We set
1589 : * atttypid to zero here as a means of catching code that incorrectly
1590 : * expects it to be valid.
1591 : */
1592 106 : attStruct->atttypid = InvalidOid;
1593 :
1594 : /* Remove any NOT NULL constraint the column may have */
1595 106 : attStruct->attnotnull = false;
1596 :
1597 : /* We don't want to keep stats for it anymore */
1598 106 : attStruct->attstattarget = 0;
1599 :
1600 : /*
1601 : * Change the column name to something that isn't likely to conflict
1602 : */
1603 106 : snprintf(newattname, sizeof(newattname),
1604 : "........pg.dropped.%d........", attnum);
1605 106 : namestrcpy(&(attStruct->attname), newattname);
1606 :
1607 106 : CatalogTupleUpdate(attr_rel, &tuple->t_self, tuple);
1608 : }
1609 :
1610 : /*
1611 : * Because updating the pg_attribute row will trigger a relcache flush for
1612 : * the target relation, we need not do anything else to notify other
1613 : * backends of the change.
1614 : */
1615 :
1616 117 : heap_close(attr_rel, RowExclusiveLock);
1617 :
1618 117 : if (attnum > 0)
1619 106 : RemoveStatistics(relid, attnum);
1620 :
1621 117 : relation_close(rel, NoLock);
1622 117 : }
1623 :
1624 : /*
1625 : * RemoveAttrDefault
1626 : *
1627 : * If the specified relation/attribute has a default, remove it.
1628 : * (If no default, raise error if complain is true, else return quietly.)
1629 : */
1630 : void
1631 31 : RemoveAttrDefault(Oid relid, AttrNumber attnum,
1632 : DropBehavior behavior, bool complain, bool internal)
1633 : {
1634 : Relation attrdef_rel;
1635 : ScanKeyData scankeys[2];
1636 : SysScanDesc scan;
1637 : HeapTuple tuple;
1638 31 : bool found = false;
1639 :
1640 31 : attrdef_rel = heap_open(AttrDefaultRelationId, RowExclusiveLock);
1641 :
1642 31 : ScanKeyInit(&scankeys[0],
1643 : Anum_pg_attrdef_adrelid,
1644 : BTEqualStrategyNumber, F_OIDEQ,
1645 : ObjectIdGetDatum(relid));
1646 31 : ScanKeyInit(&scankeys[1],
1647 : Anum_pg_attrdef_adnum,
1648 : BTEqualStrategyNumber, F_INT2EQ,
1649 31 : Int16GetDatum(attnum));
1650 :
1651 31 : scan = systable_beginscan(attrdef_rel, AttrDefaultIndexId, true,
1652 : NULL, 2, scankeys);
1653 :
1654 : /* There should be at most one matching tuple, but we loop anyway */
1655 77 : while (HeapTupleIsValid(tuple = systable_getnext(scan)))
1656 : {
1657 : ObjectAddress object;
1658 :
1659 15 : object.classId = AttrDefaultRelationId;
1660 15 : object.objectId = HeapTupleGetOid(tuple);
1661 15 : object.objectSubId = 0;
1662 :
1663 15 : performDeletion(&object, behavior,
1664 : internal ? PERFORM_DELETION_INTERNAL : 0);
1665 :
1666 15 : found = true;
1667 : }
1668 :
1669 31 : systable_endscan(scan);
1670 31 : heap_close(attrdef_rel, RowExclusiveLock);
1671 :
1672 31 : if (complain && !found)
1673 0 : elog(ERROR, "could not find attrdef tuple for relation %u attnum %d",
1674 : relid, attnum);
1675 31 : }
1676 :
1677 : /*
1678 : * RemoveAttrDefaultById
1679 : *
1680 : * Remove a pg_attrdef entry specified by OID. This is the guts of
1681 : * attribute-default removal. Note it should be called via performDeletion,
1682 : * not directly.
1683 : */
1684 : void
1685 157 : RemoveAttrDefaultById(Oid attrdefId)
1686 : {
1687 : Relation attrdef_rel;
1688 : Relation attr_rel;
1689 : Relation myrel;
1690 : ScanKeyData scankeys[1];
1691 : SysScanDesc scan;
1692 : HeapTuple tuple;
1693 : Oid myrelid;
1694 : AttrNumber myattnum;
1695 :
1696 : /* Grab an appropriate lock on the pg_attrdef relation */
1697 157 : attrdef_rel = heap_open(AttrDefaultRelationId, RowExclusiveLock);
1698 :
1699 : /* Find the pg_attrdef tuple */
1700 157 : ScanKeyInit(&scankeys[0],
1701 : ObjectIdAttributeNumber,
1702 : BTEqualStrategyNumber, F_OIDEQ,
1703 : ObjectIdGetDatum(attrdefId));
1704 :
1705 157 : scan = systable_beginscan(attrdef_rel, AttrDefaultOidIndexId, true,
1706 : NULL, 1, scankeys);
1707 :
1708 157 : tuple = systable_getnext(scan);
1709 157 : if (!HeapTupleIsValid(tuple))
1710 0 : elog(ERROR, "could not find tuple for attrdef %u", attrdefId);
1711 :
1712 157 : myrelid = ((Form_pg_attrdef) GETSTRUCT(tuple))->adrelid;
1713 157 : myattnum = ((Form_pg_attrdef) GETSTRUCT(tuple))->adnum;
1714 :
1715 : /* Get an exclusive lock on the relation owning the attribute */
1716 157 : myrel = relation_open(myrelid, AccessExclusiveLock);
1717 :
1718 : /* Now we can delete the pg_attrdef row */
1719 157 : CatalogTupleDelete(attrdef_rel, &tuple->t_self);
1720 :
1721 157 : systable_endscan(scan);
1722 157 : heap_close(attrdef_rel, RowExclusiveLock);
1723 :
1724 : /* Fix the pg_attribute row */
1725 157 : attr_rel = heap_open(AttributeRelationId, RowExclusiveLock);
1726 :
1727 157 : tuple = SearchSysCacheCopy2(ATTNUM,
1728 : ObjectIdGetDatum(myrelid),
1729 : Int16GetDatum(myattnum));
1730 157 : if (!HeapTupleIsValid(tuple)) /* shouldn't happen */
1731 0 : elog(ERROR, "cache lookup failed for attribute %d of relation %u",
1732 : myattnum, myrelid);
1733 :
1734 157 : ((Form_pg_attribute) GETSTRUCT(tuple))->atthasdef = false;
1735 :
1736 157 : CatalogTupleUpdate(attr_rel, &tuple->t_self, tuple);
1737 :
1738 : /*
1739 : * Our update of the pg_attribute row will force a relcache rebuild, so
1740 : * there's nothing else to do here.
1741 : */
1742 157 : heap_close(attr_rel, RowExclusiveLock);
1743 :
1744 : /* Keep lock on attribute's rel until end of xact */
1745 157 : relation_close(myrel, NoLock);
1746 157 : }
1747 :
1748 : /*
1749 : * heap_drop_with_catalog - removes specified relation from catalogs
1750 : *
1751 : * Note that this routine is not responsible for dropping objects that are
1752 : * linked to the pg_class entry via dependencies (for example, indexes and
1753 : * constraints). Those are deleted by the dependency-tracing logic in
1754 : * dependency.c before control gets here. In general, therefore, this routine
1755 : * should never be called directly; go through performDeletion() instead.
1756 : */
1757 : void
1758 2146 : heap_drop_with_catalog(Oid relid)
1759 : {
1760 : Relation rel;
1761 : HeapTuple tuple;
1762 2146 : Oid parentOid = InvalidOid;
1763 :
1764 : /*
1765 : * To drop a partition safely, we must grab exclusive lock on its parent,
1766 : * because another backend might be about to execute a query on the parent
1767 : * table. If it relies on previously cached partition descriptor, then it
1768 : * could attempt to access the just-dropped relation as its partition. We
1769 : * must therefore take a table lock strong enough to prevent all queries
1770 : * on the table from proceeding until we commit and send out a
1771 : * shared-cache-inval notice that will make them update their index lists.
1772 : */
1773 2146 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
1774 2146 : if (((Form_pg_class) GETSTRUCT(tuple))->relispartition)
1775 : {
1776 125 : parentOid = get_partition_parent(relid);
1777 125 : LockRelationOid(parentOid, AccessExclusiveLock);
1778 : }
1779 :
1780 2146 : ReleaseSysCache(tuple);
1781 :
1782 : /*
1783 : * Open and lock the relation.
1784 : */
1785 2146 : rel = relation_open(relid, AccessExclusiveLock);
1786 :
1787 : /*
1788 : * There can no longer be anyone *else* touching the relation, but we
1789 : * might still have open queries or cursors, or pending trigger events, in
1790 : * our own session.
1791 : */
1792 2146 : CheckTableNotInUse(rel, "DROP TABLE");
1793 :
1794 : /*
1795 : * This effectively deletes all rows in the table, and may be done in a
1796 : * serializable transaction. In that case we must record a rw-conflict in
1797 : * to this transaction from each transaction holding a predicate lock on
1798 : * the table.
1799 : */
1800 2146 : CheckTableForSerializableConflictIn(rel);
1801 :
1802 : /*
1803 : * Delete pg_foreign_table tuple first.
1804 : */
1805 2146 : if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
1806 : {
1807 : Relation rel;
1808 : HeapTuple tuple;
1809 :
1810 10 : rel = heap_open(ForeignTableRelationId, RowExclusiveLock);
1811 :
1812 10 : tuple = SearchSysCache1(FOREIGNTABLEREL, ObjectIdGetDatum(relid));
1813 10 : if (!HeapTupleIsValid(tuple))
1814 0 : elog(ERROR, "cache lookup failed for foreign table %u", relid);
1815 :
1816 10 : CatalogTupleDelete(rel, &tuple->t_self);
1817 :
1818 10 : ReleaseSysCache(tuple);
1819 10 : heap_close(rel, RowExclusiveLock);
1820 : }
1821 :
1822 : /*
1823 : * If a partitioned table, delete the pg_partitioned_table tuple.
1824 : */
1825 2146 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
1826 69 : RemovePartitionKeyByRelId(relid);
1827 :
1828 : /*
1829 : * Schedule unlinking of the relation's physical files at commit.
1830 : */
1831 4059 : if (rel->rd_rel->relkind != RELKIND_VIEW &&
1832 3796 : rel->rd_rel->relkind != RELKIND_COMPOSITE_TYPE &&
1833 3756 : rel->rd_rel->relkind != RELKIND_FOREIGN_TABLE &&
1834 1873 : rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
1835 : {
1836 1804 : RelationDropStorage(rel);
1837 : }
1838 :
1839 : /*
1840 : * Close relcache entry, but *keep* AccessExclusiveLock on the relation
1841 : * until transaction commit. This ensures no one else will try to do
1842 : * something with the doomed relation.
1843 : */
1844 2146 : relation_close(rel, NoLock);
1845 :
1846 : /*
1847 : * Remove any associated relation synchronization states.
1848 : */
1849 2146 : RemoveSubscriptionRel(InvalidOid, relid);
1850 :
1851 : /*
1852 : * Forget any ON COMMIT action for the rel
1853 : */
1854 2146 : remove_on_commit_action(relid);
1855 :
1856 : /*
1857 : * Flush the relation from the relcache. We want to do this before
1858 : * starting to remove catalog entries, just to be certain that no relcache
1859 : * entry rebuild will happen partway through. (That should not really
1860 : * matter, since we don't do CommandCounterIncrement here, but let's be
1861 : * safe.)
1862 : */
1863 2146 : RelationForgetRelation(relid);
1864 :
1865 : /*
1866 : * remove inheritance information
1867 : */
1868 2146 : RelationRemoveInheritance(relid);
1869 :
1870 : /*
1871 : * delete statistics
1872 : */
1873 2146 : RemoveStatistics(relid, 0);
1874 :
1875 : /*
1876 : * delete attribute tuples
1877 : */
1878 2146 : DeleteAttributeTuples(relid);
1879 :
1880 : /*
1881 : * delete relation tuple
1882 : */
1883 2146 : DeleteRelationTuple(relid);
1884 :
1885 2146 : if (OidIsValid(parentOid))
1886 : {
1887 : /*
1888 : * Invalidate the parent's relcache so that the partition is no longer
1889 : * included in its partition descriptor.
1890 : */
1891 125 : CacheInvalidateRelcacheByRelid(parentOid);
1892 : /* keep the lock */
1893 : }
1894 2146 : }
1895 :
1896 :
1897 : /*
1898 : * Store a default expression for column attnum of relation rel.
1899 : *
1900 : * Returns the OID of the new pg_attrdef tuple.
1901 : */
1902 : Oid
1903 181 : StoreAttrDefault(Relation rel, AttrNumber attnum,
1904 : Node *expr, bool is_internal)
1905 : {
1906 : char *adbin;
1907 : char *adsrc;
1908 : Relation adrel;
1909 : HeapTuple tuple;
1910 : Datum values[4];
1911 : static bool nulls[4] = {false, false, false, false};
1912 : Relation attrrel;
1913 : HeapTuple atttup;
1914 : Form_pg_attribute attStruct;
1915 : Oid attrdefOid;
1916 : ObjectAddress colobject,
1917 : defobject;
1918 :
1919 : /*
1920 : * Flatten expression to string form for storage.
1921 : */
1922 181 : adbin = nodeToString(expr);
1923 :
1924 : /*
1925 : * Also deparse it to form the mostly-obsolete adsrc field.
1926 : */
1927 362 : adsrc = deparse_expression(expr,
1928 181 : deparse_context_for(RelationGetRelationName(rel),
1929 : RelationGetRelid(rel)),
1930 : false, false);
1931 :
1932 : /*
1933 : * Make the pg_attrdef entry.
1934 : */
1935 181 : values[Anum_pg_attrdef_adrelid - 1] = RelationGetRelid(rel);
1936 181 : values[Anum_pg_attrdef_adnum - 1] = attnum;
1937 181 : values[Anum_pg_attrdef_adbin - 1] = CStringGetTextDatum(adbin);
1938 181 : values[Anum_pg_attrdef_adsrc - 1] = CStringGetTextDatum(adsrc);
1939 :
1940 181 : adrel = heap_open(AttrDefaultRelationId, RowExclusiveLock);
1941 :
1942 181 : tuple = heap_form_tuple(adrel->rd_att, values, nulls);
1943 181 : attrdefOid = CatalogTupleInsert(adrel, tuple);
1944 :
1945 181 : defobject.classId = AttrDefaultRelationId;
1946 181 : defobject.objectId = attrdefOid;
1947 181 : defobject.objectSubId = 0;
1948 :
1949 181 : heap_close(adrel, RowExclusiveLock);
1950 :
1951 : /* now can free some of the stuff allocated above */
1952 181 : pfree(DatumGetPointer(values[Anum_pg_attrdef_adbin - 1]));
1953 181 : pfree(DatumGetPointer(values[Anum_pg_attrdef_adsrc - 1]));
1954 181 : heap_freetuple(tuple);
1955 181 : pfree(adbin);
1956 181 : pfree(adsrc);
1957 :
1958 : /*
1959 : * Update the pg_attribute entry for the column to show that a default
1960 : * exists.
1961 : */
1962 181 : attrrel = heap_open(AttributeRelationId, RowExclusiveLock);
1963 181 : atttup = SearchSysCacheCopy2(ATTNUM,
1964 : ObjectIdGetDatum(RelationGetRelid(rel)),
1965 : Int16GetDatum(attnum));
1966 181 : if (!HeapTupleIsValid(atttup))
1967 0 : elog(ERROR, "cache lookup failed for attribute %d of relation %u",
1968 : attnum, RelationGetRelid(rel));
1969 181 : attStruct = (Form_pg_attribute) GETSTRUCT(atttup);
1970 181 : if (!attStruct->atthasdef)
1971 : {
1972 181 : attStruct->atthasdef = true;
1973 181 : CatalogTupleUpdate(attrrel, &atttup->t_self, atttup);
1974 : }
1975 181 : heap_close(attrrel, RowExclusiveLock);
1976 181 : heap_freetuple(atttup);
1977 :
1978 : /*
1979 : * Make a dependency so that the pg_attrdef entry goes away if the column
1980 : * (or whole table) is deleted.
1981 : */
1982 181 : colobject.classId = RelationRelationId;
1983 181 : colobject.objectId = RelationGetRelid(rel);
1984 181 : colobject.objectSubId = attnum;
1985 :
1986 181 : recordDependencyOn(&defobject, &colobject, DEPENDENCY_AUTO);
1987 :
1988 : /*
1989 : * Record dependencies on objects used in the expression, too.
1990 : */
1991 181 : recordDependencyOnExpr(&defobject, expr, NIL, DEPENDENCY_NORMAL);
1992 :
1993 : /*
1994 : * Post creation hook for attribute defaults.
1995 : *
1996 : * XXX. ALTER TABLE ALTER COLUMN SET/DROP DEFAULT is implemented with a
1997 : * couple of deletion/creation of the attribute's default entry, so the
1998 : * callee should check existence of an older version of this entry if it
1999 : * needs to distinguish.
2000 : */
2001 181 : InvokeObjectPostCreateHookArg(AttrDefaultRelationId,
2002 : RelationGetRelid(rel), attnum, is_internal);
2003 :
2004 181 : return attrdefOid;
2005 : }
2006 :
2007 : /*
2008 : * Store a check-constraint expression for the given relation.
2009 : *
2010 : * Caller is responsible for updating the count of constraints
2011 : * in the pg_class entry for the relation.
2012 : *
2013 : * The OID of the new constraint is returned.
2014 : */
2015 : static Oid
2016 200 : StoreRelCheck(Relation rel, char *ccname, Node *expr,
2017 : bool is_validated, bool is_local, int inhcount,
2018 : bool is_no_inherit, bool is_internal)
2019 : {
2020 : char *ccbin;
2021 : char *ccsrc;
2022 : List *varList;
2023 : int keycount;
2024 : int16 *attNos;
2025 : Oid constrOid;
2026 :
2027 : /*
2028 : * Flatten expression to string form for storage.
2029 : */
2030 200 : ccbin = nodeToString(expr);
2031 :
2032 : /*
2033 : * Also deparse it to form the mostly-obsolete consrc field.
2034 : */
2035 400 : ccsrc = deparse_expression(expr,
2036 200 : deparse_context_for(RelationGetRelationName(rel),
2037 : RelationGetRelid(rel)),
2038 : false, false);
2039 :
2040 : /*
2041 : * Find columns of rel that are used in expr
2042 : *
2043 : * NB: pull_var_clause is okay here only because we don't allow subselects
2044 : * in check constraints; it would fail to examine the contents of
2045 : * subselects.
2046 : */
2047 200 : varList = pull_var_clause(expr, 0);
2048 200 : keycount = list_length(varList);
2049 :
2050 200 : if (keycount > 0)
2051 : {
2052 : ListCell *vl;
2053 199 : int i = 0;
2054 :
2055 199 : attNos = (int16 *) palloc(keycount * sizeof(int16));
2056 446 : foreach(vl, varList)
2057 : {
2058 247 : Var *var = (Var *) lfirst(vl);
2059 : int j;
2060 :
2061 272 : for (j = 0; j < i; j++)
2062 50 : if (attNos[j] == var->varattno)
2063 25 : break;
2064 247 : if (j == i)
2065 222 : attNos[i++] = var->varattno;
2066 : }
2067 199 : keycount = i;
2068 : }
2069 : else
2070 1 : attNos = NULL;
2071 :
2072 : /*
2073 : * Partitioned tables do not contain any rows themselves, so a NO INHERIT
2074 : * constraint makes no sense.
2075 : */
2076 214 : if (is_no_inherit &&
2077 14 : rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
2078 3 : ereport(ERROR,
2079 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
2080 : errmsg("cannot add NO INHERIT constraint to partitioned table \"%s\"",
2081 : RelationGetRelationName(rel))));
2082 :
2083 : /*
2084 : * Create the Check Constraint
2085 : */
2086 197 : constrOid =
2087 394 : CreateConstraintEntry(ccname, /* Constraint Name */
2088 197 : RelationGetNamespace(rel), /* namespace */
2089 : CONSTRAINT_CHECK, /* Constraint Type */
2090 : false, /* Is Deferrable */
2091 : false, /* Is Deferred */
2092 : is_validated,
2093 : RelationGetRelid(rel), /* relation */
2094 : attNos, /* attrs in the constraint */
2095 : keycount, /* # attrs in the constraint */
2096 : InvalidOid, /* not a domain constraint */
2097 : InvalidOid, /* no associated index */
2098 : InvalidOid, /* Foreign key fields */
2099 : NULL,
2100 : NULL,
2101 : NULL,
2102 : NULL,
2103 : 0,
2104 : ' ',
2105 : ' ',
2106 : ' ',
2107 : NULL, /* not an exclusion constraint */
2108 : expr, /* Tree form of check constraint */
2109 : ccbin, /* Binary form of check constraint */
2110 : ccsrc, /* Source form of check constraint */
2111 : is_local, /* conislocal */
2112 : inhcount, /* coninhcount */
2113 : is_no_inherit, /* connoinherit */
2114 : is_internal); /* internally constructed? */
2115 :
2116 197 : pfree(ccbin);
2117 197 : pfree(ccsrc);
2118 :
2119 197 : return constrOid;
2120 : }
2121 :
2122 : /*
2123 : * Store defaults and constraints (passed as a list of CookedConstraint).
2124 : *
2125 : * Each CookedConstraint struct is modified to store the new catalog tuple OID.
2126 : *
2127 : * NOTE: only pre-cooked expressions will be passed this way, which is to
2128 : * say expressions inherited from an existing relation. Newly parsed
2129 : * expressions can be added later, by direct calls to StoreAttrDefault
2130 : * and StoreRelCheck (see AddRelationNewConstraints()).
2131 : */
2132 : static void
2133 2999 : StoreConstraints(Relation rel, List *cooked_constraints, bool is_internal)
2134 : {
2135 2999 : int numchecks = 0;
2136 : ListCell *lc;
2137 :
2138 2999 : if (cooked_constraints == NIL)
2139 5965 : return; /* nothing to do */
2140 :
2141 : /*
2142 : * Deparsing of constraint expressions will fail unless the just-created
2143 : * pg_attribute tuples for this relation are made visible. So, bump the
2144 : * command counter. CAUTION: this will cause a relcache entry rebuild.
2145 : */
2146 33 : CommandCounterIncrement();
2147 :
2148 76 : foreach(lc, cooked_constraints)
2149 : {
2150 43 : CookedConstraint *con = (CookedConstraint *) lfirst(lc);
2151 :
2152 43 : switch (con->contype)
2153 : {
2154 : case CONSTR_DEFAULT:
2155 17 : con->conoid = StoreAttrDefault(rel, con->attnum, con->expr,
2156 : is_internal);
2157 17 : break;
2158 : case CONSTR_CHECK:
2159 26 : con->conoid =
2160 104 : StoreRelCheck(rel, con->name, con->expr,
2161 52 : !con->skip_validation, con->is_local,
2162 26 : con->inhcount, con->is_no_inherit,
2163 : is_internal);
2164 26 : numchecks++;
2165 26 : break;
2166 : default:
2167 0 : elog(ERROR, "unrecognized constraint type: %d",
2168 : (int) con->contype);
2169 : }
2170 : }
2171 :
2172 33 : if (numchecks > 0)
2173 23 : SetRelationNumChecks(rel, numchecks);
2174 : }
2175 :
2176 : /*
2177 : * AddRelationNewConstraints
2178 : *
2179 : * Add new column default expressions and/or constraint check expressions
2180 : * to an existing relation. This is defined to do both for efficiency in
2181 : * DefineRelation, but of course you can do just one or the other by passing
2182 : * empty lists.
2183 : *
2184 : * rel: relation to be modified
2185 : * newColDefaults: list of RawColumnDefault structures
2186 : * newConstraints: list of Constraint nodes
2187 : * allow_merge: TRUE if check constraints may be merged with existing ones
2188 : * is_local: TRUE if definition is local, FALSE if it's inherited
2189 : * is_internal: TRUE if result of some internal process, not a user request
2190 : *
2191 : * All entries in newColDefaults will be processed. Entries in newConstraints
2192 : * will be processed only if they are CONSTR_CHECK type.
2193 : *
2194 : * Returns a list of CookedConstraint nodes that shows the cooked form of
2195 : * the default and constraint expressions added to the relation.
2196 : *
2197 : * NB: caller should have opened rel with AccessExclusiveLock, and should
2198 : * hold that lock till end of transaction. Also, we assume the caller has
2199 : * done a CommandCounterIncrement if necessary to make the relation's catalog
2200 : * tuples visible.
2201 : */
2202 : List *
2203 307 : AddRelationNewConstraints(Relation rel,
2204 : List *newColDefaults,
2205 : List *newConstraints,
2206 : bool allow_merge,
2207 : bool is_local,
2208 : bool is_internal)
2209 : {
2210 307 : List *cookedConstraints = NIL;
2211 : TupleDesc tupleDesc;
2212 : TupleConstr *oldconstr;
2213 : int numoldchecks;
2214 : ParseState *pstate;
2215 : RangeTblEntry *rte;
2216 : int numchecks;
2217 : List *checknames;
2218 : ListCell *cell;
2219 : Node *expr;
2220 : CookedConstraint *cooked;
2221 :
2222 : /*
2223 : * Get info about existing constraints.
2224 : */
2225 307 : tupleDesc = RelationGetDescr(rel);
2226 307 : oldconstr = tupleDesc->constr;
2227 307 : if (oldconstr)
2228 197 : numoldchecks = oldconstr->num_check;
2229 : else
2230 110 : numoldchecks = 0;
2231 :
2232 : /*
2233 : * Create a dummy ParseState and insert the target relation as its sole
2234 : * rangetable entry. We need a ParseState for transformExpr.
2235 : */
2236 307 : pstate = make_parsestate(NULL);
2237 307 : rte = addRangeTableEntryForRelation(pstate,
2238 : rel,
2239 : NULL,
2240 : false,
2241 : true);
2242 307 : addRTEtoQuery(pstate, rte, true, true, true);
2243 :
2244 : /*
2245 : * Process column default expressions.
2246 : */
2247 471 : foreach(cell, newColDefaults)
2248 : {
2249 165 : RawColumnDefault *colDef = (RawColumnDefault *) lfirst(cell);
2250 165 : Form_pg_attribute atp = TupleDescAttr(rel->rd_att, colDef->attnum - 1);
2251 : Oid defOid;
2252 :
2253 165 : expr = cookDefault(pstate, colDef->raw_default,
2254 : atp->atttypid, atp->atttypmod,
2255 165 : NameStr(atp->attname));
2256 :
2257 : /*
2258 : * If the expression is just a NULL constant, we do not bother to make
2259 : * an explicit pg_attrdef entry, since the default behavior is
2260 : * equivalent.
2261 : *
2262 : * Note a nonobvious property of this test: if the column is of a
2263 : * domain type, what we'll get is not a bare null Const but a
2264 : * CoerceToDomain expr, so we will not discard the default. This is
2265 : * critical because the column default needs to be retained to
2266 : * override any default that the domain might have.
2267 : */
2268 328 : if (expr == NULL ||
2269 239 : (IsA(expr, Const) &&((Const *) expr)->constisnull))
2270 1 : continue;
2271 :
2272 163 : defOid = StoreAttrDefault(rel, colDef->attnum, expr, is_internal);
2273 :
2274 163 : cooked = (CookedConstraint *) palloc(sizeof(CookedConstraint));
2275 163 : cooked->contype = CONSTR_DEFAULT;
2276 163 : cooked->conoid = defOid;
2277 163 : cooked->name = NULL;
2278 163 : cooked->attnum = colDef->attnum;
2279 163 : cooked->expr = expr;
2280 163 : cooked->skip_validation = false;
2281 163 : cooked->is_local = is_local;
2282 163 : cooked->inhcount = is_local ? 0 : 1;
2283 163 : cooked->is_no_inherit = false;
2284 163 : cookedConstraints = lappend(cookedConstraints, cooked);
2285 : }
2286 :
2287 : /*
2288 : * Process constraint expressions.
2289 : */
2290 306 : numchecks = numoldchecks;
2291 306 : checknames = NIL;
2292 488 : foreach(cell, newConstraints)
2293 : {
2294 192 : Constraint *cdef = (Constraint *) lfirst(cell);
2295 : char *ccname;
2296 : Oid constrOid;
2297 :
2298 192 : if (cdef->contype != CONSTR_CHECK)
2299 0 : continue;
2300 :
2301 192 : if (cdef->raw_expr != NULL)
2302 : {
2303 187 : Assert(cdef->cooked_expr == NULL);
2304 :
2305 : /*
2306 : * Transform raw parsetree to executable expression, and verify
2307 : * it's valid as a CHECK constraint.
2308 : */
2309 187 : expr = cookConstraint(pstate, cdef->raw_expr,
2310 187 : RelationGetRelationName(rel));
2311 : }
2312 : else
2313 : {
2314 5 : Assert(cdef->cooked_expr != NULL);
2315 :
2316 : /*
2317 : * Here, we assume the parser will only pass us valid CHECK
2318 : * expressions, so we do no particular checking.
2319 : */
2320 5 : expr = stringToNode(cdef->cooked_expr);
2321 : }
2322 :
2323 : /*
2324 : * Check name uniqueness, or generate a name if none was given.
2325 : */
2326 187 : if (cdef->conname != NULL)
2327 : {
2328 : ListCell *cell2;
2329 :
2330 143 : ccname = cdef->conname;
2331 : /* Check against other new constraints */
2332 : /* Needed because we don't do CommandCounterIncrement in loop */
2333 146 : foreach(cell2, checknames)
2334 : {
2335 3 : if (strcmp((char *) lfirst(cell2), ccname) == 0)
2336 0 : ereport(ERROR,
2337 : (errcode(ERRCODE_DUPLICATE_OBJECT),
2338 : errmsg("check constraint \"%s\" already exists",
2339 : ccname)));
2340 : }
2341 :
2342 : /* save name for future checks */
2343 143 : checknames = lappend(checknames, ccname);
2344 :
2345 : /*
2346 : * Check against pre-existing constraints. If we are allowed to
2347 : * merge with an existing constraint, there's no more to do here.
2348 : * (We omit the duplicate constraint from the result, which is
2349 : * what ATAddCheckConstraint wants.)
2350 : */
2351 286 : if (MergeWithExistingConstraint(rel, ccname, expr,
2352 : allow_merge, is_local,
2353 143 : cdef->initially_valid,
2354 143 : cdef->is_no_inherit))
2355 11 : continue;
2356 : }
2357 : else
2358 : {
2359 : /*
2360 : * When generating a name, we want to create "tab_col_check" for a
2361 : * column constraint and "tab_check" for a table constraint. We
2362 : * no longer have any info about the syntactic positioning of the
2363 : * constraint phrase, so we approximate this by seeing whether the
2364 : * expression references more than one column. (If the user
2365 : * played by the rules, the result is the same...)
2366 : *
2367 : * Note: pull_var_clause() doesn't descend into sublinks, but we
2368 : * eliminated those above; and anyway this only needs to be an
2369 : * approximate answer.
2370 : */
2371 : List *vars;
2372 : char *colname;
2373 :
2374 44 : vars = pull_var_clause(expr, 0);
2375 :
2376 : /* eliminate duplicates */
2377 44 : vars = list_union(NIL, vars);
2378 :
2379 44 : if (list_length(vars) == 1)
2380 37 : colname = get_attname(RelationGetRelid(rel),
2381 37 : ((Var *) linitial(vars))->varattno);
2382 : else
2383 7 : colname = NULL;
2384 :
2385 44 : ccname = ChooseConstraintName(RelationGetRelationName(rel),
2386 : colname,
2387 : "check",
2388 44 : RelationGetNamespace(rel),
2389 : checknames);
2390 :
2391 : /* save name for future checks */
2392 44 : checknames = lappend(checknames, ccname);
2393 : }
2394 :
2395 : /*
2396 : * OK, store it.
2397 : */
2398 174 : constrOid =
2399 348 : StoreRelCheck(rel, ccname, expr, cdef->initially_valid, is_local,
2400 174 : is_local ? 0 : 1, cdef->is_no_inherit, is_internal);
2401 :
2402 171 : numchecks++;
2403 :
2404 171 : cooked = (CookedConstraint *) palloc(sizeof(CookedConstraint));
2405 171 : cooked->contype = CONSTR_CHECK;
2406 171 : cooked->conoid = constrOid;
2407 171 : cooked->name = ccname;
2408 171 : cooked->attnum = 0;
2409 171 : cooked->expr = expr;
2410 171 : cooked->skip_validation = cdef->skip_validation;
2411 171 : cooked->is_local = is_local;
2412 171 : cooked->inhcount = is_local ? 0 : 1;
2413 171 : cooked->is_no_inherit = cdef->is_no_inherit;
2414 171 : cookedConstraints = lappend(cookedConstraints, cooked);
2415 : }
2416 :
2417 : /*
2418 : * Update the count of constraints in the relation's pg_class tuple. We do
2419 : * this even if there was no change, in order to ensure that an SI update
2420 : * message is sent out for the pg_class tuple, which will force other
2421 : * backends to rebuild their relcache entries for the rel. (This is
2422 : * critical if we added defaults but not constraints.)
2423 : */
2424 296 : SetRelationNumChecks(rel, numchecks);
2425 :
2426 296 : return cookedConstraints;
2427 : }
2428 :
2429 : /*
2430 : * Check for a pre-existing check constraint that conflicts with a proposed
2431 : * new one, and either adjust its conislocal/coninhcount settings or throw
2432 : * error as needed.
2433 : *
2434 : * Returns TRUE if merged (constraint is a duplicate), or FALSE if it's
2435 : * got a so-far-unique name, or throws error if conflict.
2436 : *
2437 : * XXX See MergeConstraintsIntoExisting too if you change this code.
2438 : */
2439 : static bool
2440 143 : MergeWithExistingConstraint(Relation rel, char *ccname, Node *expr,
2441 : bool allow_merge, bool is_local,
2442 : bool is_initially_valid,
2443 : bool is_no_inherit)
2444 : {
2445 : bool found;
2446 : Relation conDesc;
2447 : SysScanDesc conscan;
2448 : ScanKeyData skey[2];
2449 : HeapTuple tup;
2450 :
2451 : /* Search for a pg_constraint entry with same name and relation */
2452 143 : conDesc = heap_open(ConstraintRelationId, RowExclusiveLock);
2453 :
2454 143 : found = false;
2455 :
2456 143 : ScanKeyInit(&skey[0],
2457 : Anum_pg_constraint_conname,
2458 : BTEqualStrategyNumber, F_NAMEEQ,
2459 : CStringGetDatum(ccname));
2460 :
2461 143 : ScanKeyInit(&skey[1],
2462 : Anum_pg_constraint_connamespace,
2463 : BTEqualStrategyNumber, F_OIDEQ,
2464 143 : ObjectIdGetDatum(RelationGetNamespace(rel)));
2465 :
2466 143 : conscan = systable_beginscan(conDesc, ConstraintNameNspIndexId, true,
2467 : NULL, 2, skey);
2468 :
2469 143 : while (HeapTupleIsValid(tup = systable_getnext(conscan)))
2470 : {
2471 254 : Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(tup);
2472 :
2473 254 : if (con->conrelid == RelationGetRelid(rel))
2474 : {
2475 : /* Found it. Conflicts if not identical check constraint */
2476 13 : if (con->contype == CONSTRAINT_CHECK)
2477 : {
2478 : Datum val;
2479 : bool isnull;
2480 :
2481 13 : val = fastgetattr(tup,
2482 : Anum_pg_constraint_conbin,
2483 : conDesc->rd_att, &isnull);
2484 13 : if (isnull)
2485 0 : elog(ERROR, "null conbin for rel %s",
2486 : RelationGetRelationName(rel));
2487 13 : if (equal(expr, stringToNode(TextDatumGetCString(val))))
2488 13 : found = true;
2489 : }
2490 :
2491 : /*
2492 : * If the existing constraint is purely inherited (no local
2493 : * definition) then interpret addition of a local constraint as a
2494 : * legal merge. This allows ALTER ADD CONSTRAINT on parent and
2495 : * child tables to be given in either order with same end state.
2496 : * However if the relation is a partition, all inherited
2497 : * constraints are always non-local, including those that were
2498 : * merged.
2499 : */
2500 13 : if (is_local && !con->conislocal && !rel->rd_rel->relispartition)
2501 6 : allow_merge = true;
2502 :
2503 13 : if (!found || !allow_merge)
2504 0 : ereport(ERROR,
2505 : (errcode(ERRCODE_DUPLICATE_OBJECT),
2506 : errmsg("constraint \"%s\" for relation \"%s\" already exists",
2507 : ccname, RelationGetRelationName(rel))));
2508 :
2509 : /* If the child constraint is "no inherit" then cannot merge */
2510 13 : if (con->connoinherit)
2511 0 : ereport(ERROR,
2512 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
2513 : errmsg("constraint \"%s\" conflicts with non-inherited constraint on relation \"%s\"",
2514 : ccname, RelationGetRelationName(rel))));
2515 :
2516 : /*
2517 : * Must not change an existing inherited constraint to "no
2518 : * inherit" status. That's because inherited constraints should
2519 : * be able to propagate to lower-level children.
2520 : */
2521 13 : if (con->coninhcount > 0 && is_no_inherit)
2522 1 : ereport(ERROR,
2523 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
2524 : errmsg("constraint \"%s\" conflicts with inherited constraint on relation \"%s\"",
2525 : ccname, RelationGetRelationName(rel))));
2526 :
2527 : /*
2528 : * If the child constraint is "not valid" then cannot merge with a
2529 : * valid parent constraint
2530 : */
2531 12 : if (is_initially_valid && !con->convalidated)
2532 1 : ereport(ERROR,
2533 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
2534 : errmsg("constraint \"%s\" conflicts with NOT VALID constraint on relation \"%s\"",
2535 : ccname, RelationGetRelationName(rel))));
2536 :
2537 : /* OK to update the tuple */
2538 11 : ereport(NOTICE,
2539 : (errmsg("merging constraint \"%s\" with inherited definition",
2540 : ccname)));
2541 :
2542 11 : tup = heap_copytuple(tup);
2543 11 : con = (Form_pg_constraint) GETSTRUCT(tup);
2544 :
2545 : /*
2546 : * In case of partitions, an inherited constraint must be
2547 : * inherited only once since it cannot have multiple parents and
2548 : * it is never considered local.
2549 : */
2550 11 : if (rel->rd_rel->relispartition)
2551 : {
2552 1 : con->coninhcount = 1;
2553 1 : con->conislocal = false;
2554 : }
2555 : else
2556 : {
2557 10 : if (is_local)
2558 5 : con->conislocal = true;
2559 : else
2560 5 : con->coninhcount++;
2561 : }
2562 :
2563 11 : if (is_no_inherit)
2564 : {
2565 0 : Assert(is_local);
2566 0 : con->connoinherit = true;
2567 : }
2568 11 : CatalogTupleUpdate(conDesc, &tup->t_self, tup);
2569 11 : break;
2570 : }
2571 : }
2572 :
2573 141 : systable_endscan(conscan);
2574 141 : heap_close(conDesc, RowExclusiveLock);
2575 :
2576 141 : return found;
2577 : }
2578 :
2579 : /*
2580 : * Update the count of constraints in the relation's pg_class tuple.
2581 : *
2582 : * Caller had better hold exclusive lock on the relation.
2583 : *
2584 : * An important side effect is that a SI update message will be sent out for
2585 : * the pg_class tuple, which will force other backends to rebuild their
2586 : * relcache entries for the rel. Also, this backend will rebuild its
2587 : * own relcache entry at the next CommandCounterIncrement.
2588 : */
2589 : static void
2590 319 : SetRelationNumChecks(Relation rel, int numchecks)
2591 : {
2592 : Relation relrel;
2593 : HeapTuple reltup;
2594 : Form_pg_class relStruct;
2595 :
2596 319 : relrel = heap_open(RelationRelationId, RowExclusiveLock);
2597 319 : reltup = SearchSysCacheCopy1(RELOID,
2598 : ObjectIdGetDatum(RelationGetRelid(rel)));
2599 319 : if (!HeapTupleIsValid(reltup))
2600 0 : elog(ERROR, "cache lookup failed for relation %u",
2601 : RelationGetRelid(rel));
2602 319 : relStruct = (Form_pg_class) GETSTRUCT(reltup);
2603 :
2604 319 : if (relStruct->relchecks != numchecks)
2605 : {
2606 187 : relStruct->relchecks = numchecks;
2607 :
2608 187 : CatalogTupleUpdate(relrel, &reltup->t_self, reltup);
2609 : }
2610 : else
2611 : {
2612 : /* Skip the disk update, but force relcache inval anyway */
2613 132 : CacheInvalidateRelcache(rel);
2614 : }
2615 :
2616 319 : heap_freetuple(reltup);
2617 319 : heap_close(relrel, RowExclusiveLock);
2618 319 : }
2619 :
2620 : /*
2621 : * Take a raw default and convert it to a cooked format ready for
2622 : * storage.
2623 : *
2624 : * Parse state should be set up to recognize any vars that might appear
2625 : * in the expression. (Even though we plan to reject vars, it's more
2626 : * user-friendly to give the correct error message than "unknown var".)
2627 : *
2628 : * If atttypid is not InvalidOid, coerce the expression to the specified
2629 : * type (and typmod atttypmod). attname is only needed in this case:
2630 : * it is used in the error message, if any.
2631 : */
2632 : Node *
2633 173 : cookDefault(ParseState *pstate,
2634 : Node *raw_default,
2635 : Oid atttypid,
2636 : int32 atttypmod,
2637 : char *attname)
2638 : {
2639 : Node *expr;
2640 :
2641 173 : Assert(raw_default != NULL);
2642 :
2643 : /*
2644 : * Transform raw parsetree to executable expression.
2645 : */
2646 173 : expr = transformExpr(pstate, raw_default, EXPR_KIND_COLUMN_DEFAULT);
2647 :
2648 : /*
2649 : * Make sure default expr does not refer to any vars (we need this check
2650 : * since the pstate includes the target table).
2651 : */
2652 173 : if (contain_var_clause(expr))
2653 0 : ereport(ERROR,
2654 : (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
2655 : errmsg("cannot use column references in default expression")));
2656 :
2657 : /*
2658 : * transformExpr() should have already rejected subqueries, aggregates,
2659 : * window functions, and SRFs, based on the EXPR_KIND_ for a default
2660 : * expression.
2661 : */
2662 :
2663 : /*
2664 : * Coerce the expression to the correct type and typmod, if given. This
2665 : * should match the parser's processing of non-defaulted expressions ---
2666 : * see transformAssignedExpr().
2667 : */
2668 173 : if (OidIsValid(atttypid))
2669 : {
2670 173 : Oid type_id = exprType(expr);
2671 :
2672 173 : expr = coerce_to_target_type(pstate, expr, type_id,
2673 : atttypid, atttypmod,
2674 : COERCION_ASSIGNMENT,
2675 : COERCE_IMPLICIT_CAST,
2676 : -1);
2677 172 : if (expr == NULL)
2678 0 : ereport(ERROR,
2679 : (errcode(ERRCODE_DATATYPE_MISMATCH),
2680 : errmsg("column \"%s\" is of type %s"
2681 : " but default expression is of type %s",
2682 : attname,
2683 : format_type_be(atttypid),
2684 : format_type_be(type_id)),
2685 : errhint("You will need to rewrite or cast the expression.")));
2686 : }
2687 :
2688 : /*
2689 : * Finally, take care of collations in the finished expression.
2690 : */
2691 172 : assign_expr_collations(pstate, expr);
2692 :
2693 172 : return expr;
2694 : }
2695 :
2696 : /*
2697 : * Take a raw CHECK constraint expression and convert it to a cooked format
2698 : * ready for storage.
2699 : *
2700 : * Parse state must be set up to recognize any vars that might appear
2701 : * in the expression.
2702 : */
2703 : static Node *
2704 187 : cookConstraint(ParseState *pstate,
2705 : Node *raw_constraint,
2706 : char *relname)
2707 : {
2708 : Node *expr;
2709 :
2710 : /*
2711 : * Transform raw parsetree to executable expression.
2712 : */
2713 187 : expr = transformExpr(pstate, raw_constraint, EXPR_KIND_CHECK_CONSTRAINT);
2714 :
2715 : /*
2716 : * Make sure it yields a boolean result.
2717 : */
2718 182 : expr = coerce_to_boolean(pstate, expr, "CHECK");
2719 :
2720 : /*
2721 : * Take care of collations.
2722 : */
2723 182 : assign_expr_collations(pstate, expr);
2724 :
2725 : /*
2726 : * Make sure no outside relations are referred to (this is probably dead
2727 : * code now that add_missing_from is history).
2728 : */
2729 182 : if (list_length(pstate->p_rtable) != 1)
2730 0 : ereport(ERROR,
2731 : (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
2732 : errmsg("only table \"%s\" can be referenced in check constraint",
2733 : relname)));
2734 :
2735 182 : return expr;
2736 : }
2737 :
2738 :
2739 : /*
2740 : * RemoveStatistics --- remove entries in pg_statistic for a rel or column
2741 : *
2742 : * If attnum is zero, remove all entries for rel; else remove only the one(s)
2743 : * for that column.
2744 : */
2745 : void
2746 2345 : RemoveStatistics(Oid relid, AttrNumber attnum)
2747 : {
2748 : Relation pgstatistic;
2749 : SysScanDesc scan;
2750 : ScanKeyData key[2];
2751 : int nkeys;
2752 : HeapTuple tuple;
2753 :
2754 2345 : pgstatistic = heap_open(StatisticRelationId, RowExclusiveLock);
2755 :
2756 2345 : ScanKeyInit(&key[0],
2757 : Anum_pg_statistic_starelid,
2758 : BTEqualStrategyNumber, F_OIDEQ,
2759 : ObjectIdGetDatum(relid));
2760 :
2761 2345 : if (attnum == 0)
2762 2171 : nkeys = 1;
2763 : else
2764 : {
2765 174 : ScanKeyInit(&key[1],
2766 : Anum_pg_statistic_staattnum,
2767 : BTEqualStrategyNumber, F_INT2EQ,
2768 174 : Int16GetDatum(attnum));
2769 174 : nkeys = 2;
2770 : }
2771 :
2772 2345 : scan = systable_beginscan(pgstatistic, StatisticRelidAttnumInhIndexId, true,
2773 : NULL, nkeys, key);
2774 :
2775 : /* we must loop even when attnum != 0, in case of inherited stats */
2776 4789 : while (HeapTupleIsValid(tuple = systable_getnext(scan)))
2777 99 : CatalogTupleDelete(pgstatistic, &tuple->t_self);
2778 :
2779 2345 : systable_endscan(scan);
2780 :
2781 2345 : heap_close(pgstatistic, RowExclusiveLock);
2782 2345 : }
2783 :
2784 :
2785 : /*
2786 : * RelationTruncateIndexes - truncate all indexes associated
2787 : * with the heap relation to zero tuples.
2788 : *
2789 : * The routine will truncate and then reconstruct the indexes on
2790 : * the specified relation. Caller must hold exclusive lock on rel.
2791 : */
2792 : static void
2793 16 : RelationTruncateIndexes(Relation heapRelation)
2794 : {
2795 : ListCell *indlist;
2796 :
2797 : /* Ask the relcache to produce a list of the indexes of the rel */
2798 18 : foreach(indlist, RelationGetIndexList(heapRelation))
2799 : {
2800 2 : Oid indexId = lfirst_oid(indlist);
2801 : Relation currentIndex;
2802 : IndexInfo *indexInfo;
2803 :
2804 : /* Open the index relation; use exclusive lock, just to be sure */
2805 2 : currentIndex = index_open(indexId, AccessExclusiveLock);
2806 :
2807 : /* Fetch info needed for index_build */
2808 2 : indexInfo = BuildIndexInfo(currentIndex);
2809 :
2810 : /*
2811 : * Now truncate the actual file (and discard buffers).
2812 : */
2813 2 : RelationTruncate(currentIndex, 0);
2814 :
2815 : /* Initialize the index and rebuild */
2816 : /* Note: we do not need to re-establish pkey setting */
2817 2 : index_build(heapRelation, currentIndex, indexInfo, false, true);
2818 :
2819 : /* We're done with this index */
2820 2 : index_close(currentIndex, NoLock);
2821 : }
2822 16 : }
2823 :
2824 : /*
2825 : * heap_truncate
2826 : *
2827 : * This routine deletes all data within all the specified relations.
2828 : *
2829 : * This is not transaction-safe! There is another, transaction-safe
2830 : * implementation in commands/tablecmds.c. We now use this only for
2831 : * ON COMMIT truncation of temporary tables, where it doesn't matter.
2832 : */
2833 : void
2834 15 : heap_truncate(List *relids)
2835 : {
2836 15 : List *relations = NIL;
2837 : ListCell *cell;
2838 :
2839 : /* Open relations for processing, and grab exclusive access on each */
2840 31 : foreach(cell, relids)
2841 : {
2842 16 : Oid rid = lfirst_oid(cell);
2843 : Relation rel;
2844 :
2845 16 : rel = heap_open(rid, AccessExclusiveLock);
2846 16 : relations = lappend(relations, rel);
2847 : }
2848 :
2849 : /* Don't allow truncate on tables that are referenced by foreign keys */
2850 15 : heap_truncate_check_FKs(relations, true);
2851 :
2852 : /* OK to do it */
2853 28 : foreach(cell, relations)
2854 : {
2855 14 : Relation rel = lfirst(cell);
2856 :
2857 : /* Truncate the relation */
2858 14 : heap_truncate_one_rel(rel);
2859 :
2860 : /* Close the relation, but keep exclusive lock on it until commit */
2861 14 : heap_close(rel, NoLock);
2862 : }
2863 14 : }
2864 :
2865 : /*
2866 : * heap_truncate_one_rel
2867 : *
2868 : * This routine deletes all data within the specified relation.
2869 : *
2870 : * This is not transaction-safe, because the truncation is done immediately
2871 : * and cannot be rolled back later. Caller is responsible for having
2872 : * checked permissions etc, and must have obtained AccessExclusiveLock.
2873 : */
2874 : void
2875 14 : heap_truncate_one_rel(Relation rel)
2876 : {
2877 : Oid toastrelid;
2878 :
2879 : /* Truncate the actual file (and discard buffers) */
2880 14 : RelationTruncate(rel, 0);
2881 :
2882 : /* If the relation has indexes, truncate the indexes too */
2883 14 : RelationTruncateIndexes(rel);
2884 :
2885 : /* If there is a toast table, truncate that too */
2886 14 : toastrelid = rel->rd_rel->reltoastrelid;
2887 14 : if (OidIsValid(toastrelid))
2888 : {
2889 2 : Relation toastrel = heap_open(toastrelid, AccessExclusiveLock);
2890 :
2891 2 : RelationTruncate(toastrel, 0);
2892 2 : RelationTruncateIndexes(toastrel);
2893 : /* keep the lock... */
2894 2 : heap_close(toastrel, NoLock);
2895 : }
2896 14 : }
2897 :
2898 : /*
2899 : * heap_truncate_check_FKs
2900 : * Check for foreign keys referencing a list of relations that
2901 : * are to be truncated, and raise error if there are any
2902 : *
2903 : * We disallow such FKs (except self-referential ones) since the whole point
2904 : * of TRUNCATE is to not scan the individual rows to be thrown away.
2905 : *
2906 : * This is split out so it can be shared by both implementations of truncate.
2907 : * Caller should already hold a suitable lock on the relations.
2908 : *
2909 : * tempTables is only used to select an appropriate error message.
2910 : */
2911 : void
2912 75 : heap_truncate_check_FKs(List *relations, bool tempTables)
2913 : {
2914 75 : List *oids = NIL;
2915 : List *dependents;
2916 : ListCell *cell;
2917 :
2918 : /*
2919 : * Build a list of OIDs of the interesting relations.
2920 : *
2921 : * If a relation has no triggers, then it can neither have FKs nor be
2922 : * referenced by a FK from another table, so we can ignore it.
2923 : */
2924 207 : foreach(cell, relations)
2925 : {
2926 132 : Relation rel = lfirst(cell);
2927 :
2928 132 : if (rel->rd_rel->relhastriggers)
2929 58 : oids = lappend_oid(oids, RelationGetRelid(rel));
2930 : }
2931 :
2932 : /*
2933 : * Fast path: if no relation has triggers, none has FKs either.
2934 : */
2935 75 : if (oids == NIL)
2936 48 : return;
2937 :
2938 : /*
2939 : * Otherwise, must scan pg_constraint. We make one pass with all the
2940 : * relations considered; if this finds nothing, then all is well.
2941 : */
2942 27 : dependents = heap_truncate_find_FKs(oids);
2943 27 : if (dependents == NIL)
2944 15 : return;
2945 :
2946 : /*
2947 : * Otherwise we repeat the scan once per relation to identify a particular
2948 : * pair of relations to complain about. This is pretty slow, but
2949 : * performance shouldn't matter much in a failure path. The reason for
2950 : * doing things this way is to ensure that the message produced is not
2951 : * dependent on chance row locations within pg_constraint.
2952 : */
2953 16 : foreach(cell, oids)
2954 : {
2955 16 : Oid relid = lfirst_oid(cell);
2956 : ListCell *cell2;
2957 :
2958 16 : dependents = heap_truncate_find_FKs(list_make1_oid(relid));
2959 :
2960 26 : foreach(cell2, dependents)
2961 : {
2962 22 : Oid relid2 = lfirst_oid(cell2);
2963 :
2964 22 : if (!list_member_oid(oids, relid2))
2965 : {
2966 12 : char *relname = get_rel_name(relid);
2967 12 : char *relname2 = get_rel_name(relid2);
2968 :
2969 12 : if (tempTables)
2970 1 : ereport(ERROR,
2971 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2972 : errmsg("unsupported ON COMMIT and foreign key combination"),
2973 : errdetail("Table \"%s\" references \"%s\", but they do not have the same ON COMMIT setting.",
2974 : relname2, relname)));
2975 : else
2976 11 : ereport(ERROR,
2977 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2978 : errmsg("cannot truncate a table referenced in a foreign key constraint"),
2979 : errdetail("Table \"%s\" references \"%s\".",
2980 : relname2, relname),
2981 : errhint("Truncate table \"%s\" at the same time, "
2982 : "or use TRUNCATE ... CASCADE.",
2983 : relname2)));
2984 : }
2985 : }
2986 : }
2987 : }
2988 :
2989 : /*
2990 : * heap_truncate_find_FKs
2991 : * Find relations having foreign keys referencing any of the given rels
2992 : *
2993 : * Input and result are both lists of relation OIDs. The result contains
2994 : * no duplicates, does *not* include any rels that were already in the input
2995 : * list, and is sorted in OID order. (The last property is enforced mainly
2996 : * to guarantee consistent behavior in the regression tests; we don't want
2997 : * behavior to change depending on chance locations of rows in pg_constraint.)
2998 : *
2999 : * Note: caller should already have appropriate lock on all rels mentioned
3000 : * in relationIds. Since adding or dropping an FK requires exclusive lock
3001 : * on both rels, this ensures that the answer will be stable.
3002 : */
3003 : List *
3004 48 : heap_truncate_find_FKs(List *relationIds)
3005 : {
3006 48 : List *result = NIL;
3007 : Relation fkeyRel;
3008 : SysScanDesc fkeyScan;
3009 : HeapTuple tuple;
3010 :
3011 : /*
3012 : * Must scan pg_constraint. Right now, it is a seqscan because there is
3013 : * no available index on confrelid.
3014 : */
3015 48 : fkeyRel = heap_open(ConstraintRelationId, AccessShareLock);
3016 :
3017 48 : fkeyScan = systable_beginscan(fkeyRel, InvalidOid, false,
3018 : NULL, 0, NULL);
3019 :
3020 2743 : while (HeapTupleIsValid(tuple = systable_getnext(fkeyScan)))
3021 : {
3022 2647 : Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(tuple);
3023 :
3024 : /* Not a foreign key */
3025 2647 : if (con->contype != CONSTRAINT_FOREIGN)
3026 2156 : continue;
3027 :
3028 : /* Not referencing one of our list of tables */
3029 491 : if (!list_member_oid(relationIds, con->confrelid))
3030 388 : continue;
3031 :
3032 : /* Add referencer unless already in input or result list */
3033 103 : if (!list_member_oid(relationIds, con->conrelid))
3034 59 : result = insert_ordered_unique_oid(result, con->conrelid);
3035 : }
3036 :
3037 48 : systable_endscan(fkeyScan);
3038 48 : heap_close(fkeyRel, AccessShareLock);
3039 :
3040 48 : return result;
3041 : }
3042 :
3043 : /*
3044 : * insert_ordered_unique_oid
3045 : * Insert a new Oid into a sorted list of Oids, preserving ordering,
3046 : * and eliminating duplicates
3047 : *
3048 : * Building the ordered list this way is O(N^2), but with a pretty small
3049 : * constant, so for the number of entries we expect it will probably be
3050 : * faster than trying to apply qsort(). It seems unlikely someone would be
3051 : * trying to truncate a table with thousands of dependent tables ...
3052 : */
3053 : static List *
3054 59 : insert_ordered_unique_oid(List *list, Oid datum)
3055 : {
3056 : ListCell *prev;
3057 :
3058 : /* Does the datum belong at the front? */
3059 59 : if (list == NIL || datum < linitial_oid(list))
3060 35 : return lcons_oid(datum, list);
3061 : /* Does it match the first entry? */
3062 24 : if (datum == linitial_oid(list))
3063 0 : return list; /* duplicate, so don't insert */
3064 : /* No, so find the entry it belongs after */
3065 24 : prev = list_head(list);
3066 : for (;;)
3067 : {
3068 26 : ListCell *curr = lnext(prev);
3069 :
3070 26 : if (curr == NULL || datum < lfirst_oid(curr))
3071 : break; /* it belongs after 'prev', before 'curr' */
3072 :
3073 4 : if (datum == lfirst_oid(curr))
3074 2 : return list; /* duplicate, so don't insert */
3075 :
3076 2 : prev = curr;
3077 2 : }
3078 : /* Insert datum into list after 'prev' */
3079 22 : lappend_cell_oid(list, prev, datum);
3080 22 : return list;
3081 : }
3082 :
3083 : /*
3084 : * StorePartitionKey
3085 : * Store information about the partition key rel into the catalog
3086 : */
3087 : void
3088 75 : StorePartitionKey(Relation rel,
3089 : char strategy,
3090 : int16 partnatts,
3091 : AttrNumber *partattrs,
3092 : List *partexprs,
3093 : Oid *partopclass,
3094 : Oid *partcollation)
3095 : {
3096 : int i;
3097 : int2vector *partattrs_vec;
3098 : oidvector *partopclass_vec;
3099 : oidvector *partcollation_vec;
3100 : Datum partexprDatum;
3101 : Relation pg_partitioned_table;
3102 : HeapTuple tuple;
3103 : Datum values[Natts_pg_partitioned_table];
3104 : bool nulls[Natts_pg_partitioned_table];
3105 : ObjectAddress myself;
3106 : ObjectAddress referenced;
3107 :
3108 75 : Assert(rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
3109 :
3110 75 : tuple = SearchSysCache1(PARTRELID,
3111 : ObjectIdGetDatum(RelationGetRelid(rel)));
3112 :
3113 : /* Copy the partition attribute numbers, opclass OIDs into arrays */
3114 75 : partattrs_vec = buildint2vector(partattrs, partnatts);
3115 75 : partopclass_vec = buildoidvector(partopclass, partnatts);
3116 75 : partcollation_vec = buildoidvector(partcollation, partnatts);
3117 :
3118 : /* Convert the expressions (if any) to a text datum */
3119 75 : if (partexprs)
3120 : {
3121 : char *exprString;
3122 :
3123 11 : exprString = nodeToString(partexprs);
3124 11 : partexprDatum = CStringGetTextDatum(exprString);
3125 11 : pfree(exprString);
3126 : }
3127 : else
3128 64 : partexprDatum = (Datum) 0;
3129 :
3130 75 : pg_partitioned_table = heap_open(PartitionedRelationId, RowExclusiveLock);
3131 :
3132 75 : MemSet(nulls, false, sizeof(nulls));
3133 :
3134 : /* Only this can ever be NULL */
3135 75 : if (!partexprDatum)
3136 64 : nulls[Anum_pg_partitioned_table_partexprs - 1] = true;
3137 :
3138 75 : values[Anum_pg_partitioned_table_partrelid - 1] = ObjectIdGetDatum(RelationGetRelid(rel));
3139 75 : values[Anum_pg_partitioned_table_partstrat - 1] = CharGetDatum(strategy);
3140 75 : values[Anum_pg_partitioned_table_partnatts - 1] = Int16GetDatum(partnatts);
3141 75 : values[Anum_pg_partitioned_table_partattrs - 1] = PointerGetDatum(partattrs_vec);
3142 75 : values[Anum_pg_partitioned_table_partclass - 1] = PointerGetDatum(partopclass_vec);
3143 75 : values[Anum_pg_partitioned_table_partcollation - 1] = PointerGetDatum(partcollation_vec);
3144 75 : values[Anum_pg_partitioned_table_partexprs - 1] = partexprDatum;
3145 :
3146 75 : tuple = heap_form_tuple(RelationGetDescr(pg_partitioned_table), values, nulls);
3147 :
3148 75 : CatalogTupleInsert(pg_partitioned_table, tuple);
3149 75 : heap_close(pg_partitioned_table, RowExclusiveLock);
3150 :
3151 : /* Mark this relation as dependent on a few things as follows */
3152 75 : myself.classId = RelationRelationId;
3153 75 : myself.objectId = RelationGetRelid(rel);;
3154 75 : myself.objectSubId = 0;
3155 :
3156 : /* Operator class and collation per key column */
3157 169 : for (i = 0; i < partnatts; i++)
3158 : {
3159 94 : referenced.classId = OperatorClassRelationId;
3160 94 : referenced.objectId = partopclass[i];
3161 94 : referenced.objectSubId = 0;
3162 :
3163 94 : recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
3164 :
3165 : /* The default collation is pinned, so don't bother recording it */
3166 113 : if (OidIsValid(partcollation[i]) &&
3167 19 : partcollation[i] != DEFAULT_COLLATION_OID)
3168 : {
3169 1 : referenced.classId = CollationRelationId;
3170 1 : referenced.objectId = partcollation[i];
3171 1 : referenced.objectSubId = 0;
3172 : }
3173 :
3174 94 : recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
3175 : }
3176 :
3177 : /*
3178 : * Anything mentioned in the expressions. We must ignore the column
3179 : * references, which will depend on the table itself; there is no separate
3180 : * partition key object.
3181 : */
3182 75 : if (partexprs)
3183 11 : recordDependencyOnSingleRelExpr(&myself,
3184 : (Node *) partexprs,
3185 : RelationGetRelid(rel),
3186 : DEPENDENCY_NORMAL,
3187 : DEPENDENCY_AUTO, true);
3188 :
3189 : /*
3190 : * We must invalidate the relcache so that the next
3191 : * CommandCounterIncrement() will cause the same to be rebuilt using the
3192 : * information in just created catalog entry.
3193 : */
3194 75 : CacheInvalidateRelcache(rel);
3195 75 : }
3196 :
3197 : /*
3198 : * RemovePartitionKeyByRelId
3199 : * Remove pg_partitioned_table entry for a relation
3200 : */
3201 : void
3202 69 : RemovePartitionKeyByRelId(Oid relid)
3203 : {
3204 : Relation rel;
3205 : HeapTuple tuple;
3206 :
3207 69 : rel = heap_open(PartitionedRelationId, RowExclusiveLock);
3208 :
3209 69 : tuple = SearchSysCache1(PARTRELID, ObjectIdGetDatum(relid));
3210 69 : if (!HeapTupleIsValid(tuple))
3211 0 : elog(ERROR, "cache lookup failed for partition key of relation %u",
3212 : relid);
3213 :
3214 69 : CatalogTupleDelete(rel, &tuple->t_self);
3215 :
3216 69 : ReleaseSysCache(tuple);
3217 69 : heap_close(rel, RowExclusiveLock);
3218 69 : }
3219 :
3220 : /*
3221 : * StorePartitionBound
3222 : * Update pg_class tuple of rel to store the partition bound and set
3223 : * relispartition to true
3224 : *
3225 : * Also, invalidate the parent's relcache, so that the next rebuild will load
3226 : * the new partition's info into its partition descriptor.
3227 : */
3228 : void
3229 149 : StorePartitionBound(Relation rel, Relation parent, PartitionBoundSpec *bound)
3230 : {
3231 : Relation classRel;
3232 : HeapTuple tuple,
3233 : newtuple;
3234 : Datum new_val[Natts_pg_class];
3235 : bool new_null[Natts_pg_class],
3236 : new_repl[Natts_pg_class];
3237 :
3238 : /* Update pg_class tuple */
3239 149 : classRel = heap_open(RelationRelationId, RowExclusiveLock);
3240 149 : tuple = SearchSysCacheCopy1(RELOID,
3241 : ObjectIdGetDatum(RelationGetRelid(rel)));
3242 149 : if (!HeapTupleIsValid(tuple))
3243 0 : elog(ERROR, "cache lookup failed for relation %u",
3244 : RelationGetRelid(rel));
3245 :
3246 : #ifdef USE_ASSERT_CHECKING
3247 : {
3248 : Form_pg_class classForm;
3249 : bool isnull;
3250 :
3251 149 : classForm = (Form_pg_class) GETSTRUCT(tuple);
3252 149 : Assert(!classForm->relispartition);
3253 149 : (void) SysCacheGetAttr(RELOID, tuple, Anum_pg_class_relpartbound,
3254 : &isnull);
3255 149 : Assert(isnull);
3256 : }
3257 : #endif
3258 :
3259 : /* Fill in relpartbound value */
3260 149 : memset(new_val, 0, sizeof(new_val));
3261 149 : memset(new_null, false, sizeof(new_null));
3262 149 : memset(new_repl, false, sizeof(new_repl));
3263 149 : new_val[Anum_pg_class_relpartbound - 1] = CStringGetTextDatum(nodeToString(bound));
3264 149 : new_null[Anum_pg_class_relpartbound - 1] = false;
3265 149 : new_repl[Anum_pg_class_relpartbound - 1] = true;
3266 149 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(classRel),
3267 : new_val, new_null, new_repl);
3268 : /* Also set the flag */
3269 149 : ((Form_pg_class) GETSTRUCT(newtuple))->relispartition = true;
3270 149 : CatalogTupleUpdate(classRel, &newtuple->t_self, newtuple);
3271 149 : heap_freetuple(newtuple);
3272 149 : heap_close(classRel, RowExclusiveLock);
3273 :
3274 149 : CacheInvalidateRelcache(parent);
3275 149 : }
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