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parse_utilcmd.c
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1 /*-------------------------------------------------------------------------
2  *
3  * parse_utilcmd.c
4  * Perform parse analysis work for various utility commands
5  *
6  * Formerly we did this work during parse_analyze() in analyze.c. However
7  * that is fairly unsafe in the presence of querytree caching, since any
8  * database state that we depend on in making the transformations might be
9  * obsolete by the time the utility command is executed; and utility commands
10  * have no infrastructure for holding locks or rechecking plan validity.
11  * Hence these functions are now called at the start of execution of their
12  * respective utility commands.
13  *
14  * NOTE: in general we must avoid scribbling on the passed-in raw parse
15  * tree, since it might be in a plan cache. The simplest solution is
16  * a quick copyObject() call before manipulating the query tree.
17  *
18  *
19  * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
20  * Portions Copyright (c) 1994, Regents of the University of California
21  *
22  * src/backend/parser/parse_utilcmd.c
23  *
24  *-------------------------------------------------------------------------
25  */
26 
27 #include "postgres.h"
28 
29 #include "access/amapi.h"
30 #include "access/htup_details.h"
31 #include "access/relation.h"
32 #include "access/reloptions.h"
33 #include "access/table.h"
34 #include "catalog/dependency.h"
35 #include "catalog/heap.h"
36 #include "catalog/index.h"
37 #include "catalog/namespace.h"
38 #include "catalog/pg_am.h"
39 #include "catalog/pg_collation.h"
40 #include "catalog/pg_constraint.h"
41 #include "catalog/pg_opclass.h"
42 #include "catalog/pg_operator.h"
43 #include "catalog/pg_statistic_ext.h"
44 #include "catalog/pg_type.h"
45 #include "commands/comment.h"
46 #include "commands/defrem.h"
47 #include "commands/sequence.h"
48 #include "commands/tablecmds.h"
49 #include "commands/tablespace.h"
50 #include "miscadmin.h"
51 #include "nodes/makefuncs.h"
52 #include "nodes/nodeFuncs.h"
53 #include "optimizer/optimizer.h"
54 #include "parser/analyze.h"
55 #include "parser/parse_clause.h"
56 #include "parser/parse_coerce.h"
57 #include "parser/parse_collate.h"
58 #include "parser/parse_expr.h"
59 #include "parser/parse_relation.h"
60 #include "parser/parse_target.h"
61 #include "parser/parse_type.h"
62 #include "parser/parse_utilcmd.h"
63 #include "parser/parser.h"
64 #include "rewrite/rewriteManip.h"
65 #include "utils/acl.h"
66 #include "utils/builtins.h"
67 #include "utils/lsyscache.h"
68 #include "utils/partcache.h"
69 #include "utils/rel.h"
70 #include "utils/ruleutils.h"
71 #include "utils/syscache.h"
72 #include "utils/typcache.h"
73 
74 
75 /* State shared by transformCreateStmt and its subroutines */
76 typedef struct
77 {
78  ParseState *pstate; /* overall parser state */
79  const char *stmtType; /* "CREATE [FOREIGN] TABLE" or "ALTER TABLE" */
80  RangeVar *relation; /* relation to create */
81  Relation rel; /* opened/locked rel, if ALTER */
82  List *inhRelations; /* relations to inherit from */
83  bool isforeign; /* true if CREATE/ALTER FOREIGN TABLE */
84  bool isalter; /* true if altering existing table */
85  List *columns; /* ColumnDef items */
86  List *ckconstraints; /* CHECK constraints */
87  List *fkconstraints; /* FOREIGN KEY constraints */
88  List *ixconstraints; /* index-creating constraints */
89  List *inh_indexes; /* cloned indexes from INCLUDING INDEXES */
90  List *extstats; /* cloned extended statistics */
91  List *blist; /* "before list" of things to do before
92  * creating the table */
93  List *alist; /* "after list" of things to do after creating
94  * the table */
95  IndexStmt *pkey; /* PRIMARY KEY index, if any */
96  bool ispartitioned; /* true if table is partitioned */
97  PartitionBoundSpec *partbound; /* transformed FOR VALUES */
98  bool ofType; /* true if statement contains OF typename */
99 } CreateStmtContext;
100 
101 /* State shared by transformCreateSchemaStmt and its subroutines */
102 typedef struct
103 {
104  const char *stmtType; /* "CREATE SCHEMA" or "ALTER SCHEMA" */
105  char *schemaname; /* name of schema */
106  RoleSpec *authrole; /* owner of schema */
107  List *sequences; /* CREATE SEQUENCE items */
108  List *tables; /* CREATE TABLE items */
109  List *views; /* CREATE VIEW items */
110  List *indexes; /* CREATE INDEX items */
111  List *triggers; /* CREATE TRIGGER items */
112  List *grants; /* GRANT items */
113 } CreateSchemaStmtContext;
114 
115 
116 static void transformColumnDefinition(CreateStmtContext *cxt,
117  ColumnDef *column);
118 static void transformTableConstraint(CreateStmtContext *cxt,
119  Constraint *constraint);
120 static void transformTableLikeClause(CreateStmtContext *cxt,
121  TableLikeClause *table_like_clause);
122 static void transformOfType(CreateStmtContext *cxt,
123  TypeName *ofTypename);
124 static CreateStatsStmt *generateClonedExtStatsStmt(RangeVar *heapRel,
125  Oid heapRelid, Oid source_statsid);
126 static List *get_collation(Oid collation, Oid actual_datatype);
127 static List *get_opclass(Oid opclass, Oid actual_datatype);
128 static void transformIndexConstraints(CreateStmtContext *cxt);
129 static IndexStmt *transformIndexConstraint(Constraint *constraint,
130  CreateStmtContext *cxt);
131 static void transformExtendedStatistics(CreateStmtContext *cxt);
132 static void transformFKConstraints(CreateStmtContext *cxt,
133  bool skipValidation,
134  bool isAddConstraint);
135 static void transformCheckConstraints(CreateStmtContext *cxt,
136  bool skipValidation);
137 static void transformConstraintAttrs(CreateStmtContext *cxt,
138  List *constraintList);
139 static void transformColumnType(CreateStmtContext *cxt, ColumnDef *column);
140 static void setSchemaName(char *context_schema, char **stmt_schema_name);
141 static void transformPartitionCmd(CreateStmtContext *cxt, PartitionCmd *cmd);
142 static List *transformPartitionRangeBounds(ParseState *pstate, List *blist,
143  Relation parent);
144 static void validateInfiniteBounds(ParseState *pstate, List *blist);
145 static Const *transformPartitionBoundValue(ParseState *pstate, Node *con,
146  const char *colName, Oid colType, int32 colTypmod,
147  Oid partCollation);
148 
149 
150 /*
151  * transformCreateStmt -
152  * parse analysis for CREATE TABLE
153  *
154  * Returns a List of utility commands to be done in sequence. One of these
155  * will be the transformed CreateStmt, but there may be additional actions
156  * to be done before and after the actual DefineRelation() call.
157  *
158  * SQL allows constraints to be scattered all over, so thumb through
159  * the columns and collect all constraints into one place.
160  * If there are any implied indices (e.g. UNIQUE or PRIMARY KEY)
161  * then expand those into multiple IndexStmt blocks.
162  * - thomas 1997-12-02
163  */
164 List *
165 transformCreateStmt(CreateStmt *stmt, const char *queryString)
166 {
167  ParseState *pstate;
168  CreateStmtContext cxt;
169  List *result;
170  List *save_alist;
171  ListCell *elements;
172  Oid namespaceid;
173  Oid existing_relid;
174  ParseCallbackState pcbstate;
175  bool is_foreign_table = IsA(stmt, CreateForeignTableStmt);
176 
177  /*
178  * We must not scribble on the passed-in CreateStmt, so copy it. (This is
179  * overkill, but easy.)
180  */
181  stmt = copyObject(stmt);
182 
183  /* Set up pstate */
184  pstate = make_parsestate(NULL);
185  pstate->p_sourcetext = queryString;
186 
187  /*
188  * Look up the creation namespace. This also checks permissions on the
189  * target namespace, locks it against concurrent drops, checks for a
190  * preexisting relation in that namespace with the same name, and updates
191  * stmt->relation->relpersistence if the selected namespace is temporary.
192  */
193  setup_parser_errposition_callback(&pcbstate, pstate,
194  stmt->relation->location);
195  namespaceid =
196  RangeVarGetAndCheckCreationNamespace(stmt->relation, NoLock,
197  &existing_relid);
198  cancel_parser_errposition_callback(&pcbstate);
199 
200  /*
201  * If the relation already exists and the user specified "IF NOT EXISTS",
202  * bail out with a NOTICE.
203  */
204  if (stmt->if_not_exists && OidIsValid(existing_relid))
205  {
206  ereport(NOTICE,
207  (errcode(ERRCODE_DUPLICATE_TABLE),
208  errmsg("relation \"%s\" already exists, skipping",
209  stmt->relation->relname)));
210  return NIL;
211  }
212 
213  /*
214  * If the target relation name isn't schema-qualified, make it so. This
215  * prevents some corner cases in which added-on rewritten commands might
216  * think they should apply to other relations that have the same name and
217  * are earlier in the search path. But a local temp table is effectively
218  * specified to be in pg_temp, so no need for anything extra in that case.
219  */
220  if (stmt->relation->schemaname == NULL
221  && stmt->relation->relpersistence != RELPERSISTENCE_TEMP)
222  stmt->relation->schemaname = get_namespace_name(namespaceid);
223 
224  /* Set up CreateStmtContext */
225  cxt.pstate = pstate;
226  if (IsA(stmt, CreateForeignTableStmt))
227  {
228  cxt.stmtType = "CREATE FOREIGN TABLE";
229  cxt.isforeign = true;
230  }
231  else
232  {
233  cxt.stmtType = "CREATE TABLE";
234  cxt.isforeign = false;
235  }
236  cxt.relation = stmt->relation;
237  cxt.rel = NULL;
238  cxt.inhRelations = stmt->inhRelations;
239  cxt.isalter = false;
240  cxt.columns = NIL;
241  cxt.ckconstraints = NIL;
242  cxt.fkconstraints = NIL;
243  cxt.ixconstraints = NIL;
244  cxt.inh_indexes = NIL;
245  cxt.extstats = NIL;
246  cxt.blist = NIL;
247  cxt.alist = NIL;
248  cxt.pkey = NULL;
249  cxt.ispartitioned = stmt->partspec != NULL;
250  cxt.partbound = stmt->partbound;
251  cxt.ofType = (stmt->ofTypename != NULL);
252 
253  Assert(!stmt->ofTypename || !stmt->inhRelations); /* grammar enforces */
254 
255  if (stmt->ofTypename)
256  transformOfType(&cxt, stmt->ofTypename);
257 
258  if (stmt->partspec)
259  {
260  if (stmt->inhRelations && !stmt->partbound)
261  ereport(ERROR,
262  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
263  errmsg("cannot create partitioned table as inheritance child")));
264  }
265 
266  /*
267  * Run through each primary element in the table creation clause. Separate
268  * column defs from constraints, and do preliminary analysis.
269  */
270  foreach(elements, stmt->tableElts)
271  {
272  Node *element = lfirst(elements);
273 
274  switch (nodeTag(element))
275  {
276  case T_ColumnDef:
277  transformColumnDefinition(&cxt, (ColumnDef *) element);
278  break;
279 
280  case T_Constraint:
281  transformTableConstraint(&cxt, (Constraint *) element);
282  break;
283 
284  case T_TableLikeClause:
285  transformTableLikeClause(&cxt, (TableLikeClause *) element);
286  break;
287 
288  default:
289  elog(ERROR, "unrecognized node type: %d",
290  (int) nodeTag(element));
291  break;
292  }
293  }
294 
295  /*
296  * Transfer anything we already have in cxt.alist into save_alist, to keep
297  * it separate from the output of transformIndexConstraints. (This may
298  * not be necessary anymore, but we'll keep doing it to preserve the
299  * historical order of execution of the alist commands.)
300  */
301  save_alist = cxt.alist;
302  cxt.alist = NIL;
303 
304  Assert(stmt->constraints == NIL);
305 
306  /*
307  * Postprocess constraints that give rise to index definitions.
308  */
309  transformIndexConstraints(&cxt);
310 
311  /*
312  * Postprocess foreign-key constraints.
313  */
314  transformFKConstraints(&cxt, true, false);
315 
316  /*
317  * Postprocess check constraints.
318  */
319  transformCheckConstraints(&cxt, !is_foreign_table ? true : false);
320 
321  /*
322  * Postprocess extended statistics.
323  */
324  transformExtendedStatistics(&cxt);
325 
326  /*
327  * Output results.
328  */
329  stmt->tableElts = cxt.columns;
330  stmt->constraints = cxt.ckconstraints;
331 
332  result = lappend(cxt.blist, stmt);
333  result = list_concat(result, cxt.alist);
334  result = list_concat(result, save_alist);
335 
336  return result;
337 }
338 
339 /*
340  * generateSerialExtraStmts
341  * Generate CREATE SEQUENCE and ALTER SEQUENCE ... OWNED BY statements
342  * to create the sequence for a serial or identity column.
343  *
344  * This includes determining the name the sequence will have. The caller
345  * can ask to get back the name components by passing non-null pointers
346  * for snamespace_p and sname_p.
347  */
348 static void
349 generateSerialExtraStmts(CreateStmtContext *cxt, ColumnDef *column,
350  Oid seqtypid, List *seqoptions, bool for_identity,
351  char **snamespace_p, char **sname_p)
352 {
353  ListCell *option;
354  DefElem *nameEl = NULL;
355  Oid snamespaceid;
356  char *snamespace;
357  char *sname;
358  CreateSeqStmt *seqstmt;
359  AlterSeqStmt *altseqstmt;
360  List *attnamelist;
361 
362  /*
363  * Determine namespace and name to use for the sequence.
364  *
365  * First, check if a sequence name was passed in as an option. This is
366  * used by pg_dump. Else, generate a name.
367  *
368  * Although we use ChooseRelationName, it's not guaranteed that the
369  * selected sequence name won't conflict; given sufficiently long field
370  * names, two different serial columns in the same table could be assigned
371  * the same sequence name, and we'd not notice since we aren't creating
372  * the sequence quite yet. In practice this seems quite unlikely to be a
373  * problem, especially since few people would need two serial columns in
374  * one table.
375  */
376  foreach(option, seqoptions)
377  {
378  DefElem *defel = lfirst_node(DefElem, option);
379 
380  if (strcmp(defel->defname, "sequence_name") == 0)
381  {
382  if (nameEl)
383  ereport(ERROR,
384  (errcode(ERRCODE_SYNTAX_ERROR),
385  errmsg("conflicting or redundant options")));
386  nameEl = defel;
387  }
388  }
389 
390  if (nameEl)
391  {
392  RangeVar *rv = makeRangeVarFromNameList(castNode(List, nameEl->arg));
393 
394  snamespace = rv->schemaname;
395  if (!snamespace)
396  {
397  /* Given unqualified SEQUENCE NAME, select namespace */
398  if (cxt->rel)
399  snamespaceid = RelationGetNamespace(cxt->rel);
400  else
401  snamespaceid = RangeVarGetCreationNamespace(cxt->relation);
402  snamespace = get_namespace_name(snamespaceid);
403  }
404  sname = rv->relname;
405  /* Remove the SEQUENCE NAME item from seqoptions */
406  seqoptions = list_delete_ptr(seqoptions, nameEl);
407  }
408  else
409  {
410  if (cxt->rel)
411  snamespaceid = RelationGetNamespace(cxt->rel);
412  else
413  {
414  snamespaceid = RangeVarGetCreationNamespace(cxt->relation);
415  RangeVarAdjustRelationPersistence(cxt->relation, snamespaceid);
416  }
417  snamespace = get_namespace_name(snamespaceid);
418  sname = ChooseRelationName(cxt->relation->relname,
419  column->colname,
420  "seq",
421  snamespaceid,
422  false);
423  }
424 
425  ereport(DEBUG1,
426  (errmsg("%s will create implicit sequence \"%s\" for serial column \"%s.%s\"",
427  cxt->stmtType, sname,
428  cxt->relation->relname, column->colname)));
429 
430  /*
431  * Build a CREATE SEQUENCE command to create the sequence object, and add
432  * it to the list of things to be done before this CREATE/ALTER TABLE.
433  */
434  seqstmt = makeNode(CreateSeqStmt);
435  seqstmt->for_identity = for_identity;
436  seqstmt->sequence = makeRangeVar(snamespace, sname, -1);
437  seqstmt->options = seqoptions;
438 
439  /*
440  * If a sequence data type was specified, add it to the options. Prepend
441  * to the list rather than append; in case a user supplied their own AS
442  * clause, the "redundant options" error will point to their occurrence,
443  * not our synthetic one.
444  */
445  if (seqtypid)
446  seqstmt->options = lcons(makeDefElem("as",
447  (Node *) makeTypeNameFromOid(seqtypid, -1),
448  -1),
449  seqstmt->options);
450 
451  /*
452  * If this is ALTER ADD COLUMN, make sure the sequence will be owned by
453  * the table's owner. The current user might be someone else (perhaps a
454  * superuser, or someone who's only a member of the owning role), but the
455  * SEQUENCE OWNED BY mechanisms will bleat unless table and sequence have
456  * exactly the same owning role.
457  */
458  if (cxt->rel)
459  seqstmt->ownerId = cxt->rel->rd_rel->relowner;
460  else
461  seqstmt->ownerId = InvalidOid;
462 
463  cxt->blist = lappend(cxt->blist, seqstmt);
464 
465  /*
466  * Store the identity sequence name that we decided on. ALTER TABLE ...
467  * ADD COLUMN ... IDENTITY needs this so that it can fill the new column
468  * with values from the sequence, while the association of the sequence
469  * with the table is not set until after the ALTER TABLE.
470  */
471  column->identitySequence = seqstmt->sequence;
472 
473  /*
474  * Build an ALTER SEQUENCE ... OWNED BY command to mark the sequence as
475  * owned by this column, and add it to the list of things to be done after
476  * this CREATE/ALTER TABLE.
477  */
478  altseqstmt = makeNode(AlterSeqStmt);
479  altseqstmt->sequence = makeRangeVar(snamespace, sname, -1);
480  attnamelist = list_make3(makeString(snamespace),
481  makeString(cxt->relation->relname),
482  makeString(column->colname));
483  altseqstmt->options = list_make1(makeDefElem("owned_by",
484  (Node *) attnamelist, -1));
485  altseqstmt->for_identity = for_identity;
486 
487  cxt->alist = lappend(cxt->alist, altseqstmt);
488 
489  if (snamespace_p)
490  *snamespace_p = snamespace;
491  if (sname_p)
492  *sname_p = sname;
493 }
494 
495 /*
496  * transformColumnDefinition -
497  * transform a single ColumnDef within CREATE TABLE
498  * Also used in ALTER TABLE ADD COLUMN
499  */
500 static void
501 transformColumnDefinition(CreateStmtContext *cxt, ColumnDef *column)
502 {
503  bool is_serial;
504  bool saw_nullable;
505  bool saw_default;
506  bool saw_identity;
507  bool saw_generated;
508  ListCell *clist;
509 
510  cxt->columns = lappend(cxt->columns, column);
511 
512  /* Check for SERIAL pseudo-types */
513  is_serial = false;
514  if (column->typeName
515  && list_length(column->typeName->names) == 1
516  && !column->typeName->pct_type)
517  {
518  char *typname = strVal(linitial(column->typeName->names));
519 
520  if (strcmp(typname, "smallserial") == 0 ||
521  strcmp(typname, "serial2") == 0)
522  {
523  is_serial = true;
524  column->typeName->names = NIL;
525  column->typeName->typeOid = INT2OID;
526  }
527  else if (strcmp(typname, "serial") == 0 ||
528  strcmp(typname, "serial4") == 0)
529  {
530  is_serial = true;
531  column->typeName->names = NIL;
532  column->typeName->typeOid = INT4OID;
533  }
534  else if (strcmp(typname, "bigserial") == 0 ||
535  strcmp(typname, "serial8") == 0)
536  {
537  is_serial = true;
538  column->typeName->names = NIL;
539  column->typeName->typeOid = INT8OID;
540  }
541 
542  /*
543  * We have to reject "serial[]" explicitly, because once we've set
544  * typeid, LookupTypeName won't notice arrayBounds. We don't need any
545  * special coding for serial(typmod) though.
546  */
547  if (is_serial && column->typeName->arrayBounds != NIL)
548  ereport(ERROR,
549  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
550  errmsg("array of serial is not implemented"),
551  parser_errposition(cxt->pstate,
552  column->typeName->location)));
553  }
554 
555  /* Do necessary work on the column type declaration */
556  if (column->typeName)
557  transformColumnType(cxt, column);
558 
559  /* Special actions for SERIAL pseudo-types */
560  if (is_serial)
561  {
562  char *snamespace;
563  char *sname;
564  char *qstring;
565  A_Const *snamenode;
566  TypeCast *castnode;
567  FuncCall *funccallnode;
568  Constraint *constraint;
569 
570  generateSerialExtraStmts(cxt, column,
571  column->typeName->typeOid, NIL, false,
572  &snamespace, &sname);
573 
574  /*
575  * Create appropriate constraints for SERIAL. We do this in full,
576  * rather than shortcutting, so that we will detect any conflicting
577  * constraints the user wrote (like a different DEFAULT).
578  *
579  * Create an expression tree representing the function call
580  * nextval('sequencename'). We cannot reduce the raw tree to cooked
581  * form until after the sequence is created, but there's no need to do
582  * so.
583  */
584  qstring = quote_qualified_identifier(snamespace, sname);
585  snamenode = makeNode(A_Const);
586  snamenode->val.type = T_String;
587  snamenode->val.val.str = qstring;
588  snamenode->location = -1;
589  castnode = makeNode(TypeCast);
590  castnode->typeName = SystemTypeName("regclass");
591  castnode->arg = (Node *) snamenode;
592  castnode->location = -1;
593  funccallnode = makeFuncCall(SystemFuncName("nextval"),
594  list_make1(castnode),
595  -1);
596  constraint = makeNode(Constraint);
597  constraint->contype = CONSTR_DEFAULT;
598  constraint->location = -1;
599  constraint->raw_expr = (Node *) funccallnode;
600  constraint->cooked_expr = NULL;
601  column->constraints = lappend(column->constraints, constraint);
602 
603  constraint = makeNode(Constraint);
604  constraint->contype = CONSTR_NOTNULL;
605  constraint->location = -1;
606  column->constraints = lappend(column->constraints, constraint);
607  }
608 
609  /* Process column constraints, if any... */
610  transformConstraintAttrs(cxt, column->constraints);
611 
612  saw_nullable = false;
613  saw_default = false;
614  saw_identity = false;
615  saw_generated = false;
616 
617  foreach(clist, column->constraints)
618  {
619  Constraint *constraint = lfirst_node(Constraint, clist);
620 
621  switch (constraint->contype)
622  {
623  case CONSTR_NULL:
624  if (saw_nullable && column->is_not_null)
625  ereport(ERROR,
626  (errcode(ERRCODE_SYNTAX_ERROR),
627  errmsg("conflicting NULL/NOT NULL declarations for column \"%s\" of table \"%s\"",
628  column->colname, cxt->relation->relname),
629  parser_errposition(cxt->pstate,
630  constraint->location)));
631  column->is_not_null = false;
632  saw_nullable = true;
633  break;
634 
635  case CONSTR_NOTNULL:
636  if (saw_nullable && !column->is_not_null)
637  ereport(ERROR,
638  (errcode(ERRCODE_SYNTAX_ERROR),
639  errmsg("conflicting NULL/NOT NULL declarations for column \"%s\" of table \"%s\"",
640  column->colname, cxt->relation->relname),
641  parser_errposition(cxt->pstate,
642  constraint->location)));
643  column->is_not_null = true;
644  saw_nullable = true;
645  break;
646 
647  case CONSTR_DEFAULT:
648  if (saw_default)
649  ereport(ERROR,
650  (errcode(ERRCODE_SYNTAX_ERROR),
651  errmsg("multiple default values specified for column \"%s\" of table \"%s\"",
652  column->colname, cxt->relation->relname),
653  parser_errposition(cxt->pstate,
654  constraint->location)));
655  column->raw_default = constraint->raw_expr;
656  Assert(constraint->cooked_expr == NULL);
657  saw_default = true;
658  break;
659 
660  case CONSTR_IDENTITY:
661  {
662  Type ctype;
663  Oid typeOid;
664 
665  if (cxt->ofType)
666  ereport(ERROR,
667  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
668  errmsg("identity columns are not supported on typed tables")));
669  if (cxt->partbound)
670  ereport(ERROR,
671  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
672  errmsg("identity columns are not supported on partitions")));
673 
674  ctype = typenameType(cxt->pstate, column->typeName, NULL);
675  typeOid = ((Form_pg_type) GETSTRUCT(ctype))->oid;
676  ReleaseSysCache(ctype);
677 
678  if (saw_identity)
679  ereport(ERROR,
680  (errcode(ERRCODE_SYNTAX_ERROR),
681  errmsg("multiple identity specifications for column \"%s\" of table \"%s\"",
682  column->colname, cxt->relation->relname),
683  parser_errposition(cxt->pstate,
684  constraint->location)));
685 
686  generateSerialExtraStmts(cxt, column,
687  typeOid, constraint->options, true,
688  NULL, NULL);
689 
690  column->identity = constraint->generated_when;
691  saw_identity = true;
692  column->is_not_null = true;
693  break;
694  }
695 
696  case CONSTR_GENERATED:
697  if (cxt->ofType)
698  ereport(ERROR,
699  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
700  errmsg("generated columns are not supported on typed tables")));
701  if (cxt->partbound)
702  ereport(ERROR,
703  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
704  errmsg("generated columns are not supported on partitions")));
705 
706  if (saw_generated)
707  ereport(ERROR,
708  (errcode(ERRCODE_SYNTAX_ERROR),
709  errmsg("multiple generation clauses specified for column \"%s\" of table \"%s\"",
710  column->colname, cxt->relation->relname),
711  parser_errposition(cxt->pstate,
712  constraint->location)));
713  column->generated = ATTRIBUTE_GENERATED_STORED;
714  column->raw_default = constraint->raw_expr;
715  Assert(constraint->cooked_expr == NULL);
716  saw_generated = true;
717  break;
718 
719  case CONSTR_CHECK:
720  cxt->ckconstraints = lappend(cxt->ckconstraints, constraint);
721  break;
722 
723  case CONSTR_PRIMARY:
724  if (cxt->isforeign)
725  ereport(ERROR,
726  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
727  errmsg("primary key constraints are not supported on foreign tables"),
728  parser_errposition(cxt->pstate,
729  constraint->location)));
730  /* FALL THRU */
731 
732  case CONSTR_UNIQUE:
733  if (cxt->isforeign)
734  ereport(ERROR,
735  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
736  errmsg("unique constraints are not supported on foreign tables"),
737  parser_errposition(cxt->pstate,
738  constraint->location)));
739  if (constraint->keys == NIL)
740  constraint->keys = list_make1(makeString(column->colname));
741  cxt->ixconstraints = lappend(cxt->ixconstraints, constraint);
742  break;
743 
744  case CONSTR_EXCLUSION:
745  /* grammar does not allow EXCLUDE as a column constraint */
746  elog(ERROR, "column exclusion constraints are not supported");
747  break;
748 
749  case CONSTR_FOREIGN:
750  if (cxt->isforeign)
751  ereport(ERROR,
752  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
753  errmsg("foreign key constraints are not supported on foreign tables"),
754  parser_errposition(cxt->pstate,
755  constraint->location)));
756 
757  /*
758  * Fill in the current attribute's name and throw it into the
759  * list of FK constraints to be processed later.
760  */
761  constraint->fk_attrs = list_make1(makeString(column->colname));
762  cxt->fkconstraints = lappend(cxt->fkconstraints, constraint);
763  break;
764 
765  case CONSTR_ATTR_DEFERRABLE:
766  case CONSTR_ATTR_NOT_DEFERRABLE:
767  case CONSTR_ATTR_DEFERRED:
768  case CONSTR_ATTR_IMMEDIATE:
769  /* transformConstraintAttrs took care of these */
770  break;
771 
772  default:
773  elog(ERROR, "unrecognized constraint type: %d",
774  constraint->contype);
775  break;
776  }
777 
778  if (saw_default && saw_identity)
779  ereport(ERROR,
780  (errcode(ERRCODE_SYNTAX_ERROR),
781  errmsg("both default and identity specified for column \"%s\" of table \"%s\"",
782  column->colname, cxt->relation->relname),
783  parser_errposition(cxt->pstate,
784  constraint->location)));
785 
786  if (saw_default && saw_generated)
787  ereport(ERROR,
788  (errcode(ERRCODE_SYNTAX_ERROR),
789  errmsg("both default and generation expression specified for column \"%s\" of table \"%s\"",
790  column->colname, cxt->relation->relname),
791  parser_errposition(cxt->pstate,
792  constraint->location)));
793 
794  if (saw_identity && saw_generated)
795  ereport(ERROR,
796  (errcode(ERRCODE_SYNTAX_ERROR),
797  errmsg("both identity and generation expression specified for column \"%s\" of table \"%s\"",
798  column->colname, cxt->relation->relname),
799  parser_errposition(cxt->pstate,
800  constraint->location)));
801  }
802 
803  /*
804  * If needed, generate ALTER FOREIGN TABLE ALTER COLUMN statement to add
805  * per-column foreign data wrapper options to this column after creation.
806  */
807  if (column->fdwoptions != NIL)
808  {
809  AlterTableStmt *stmt;
810  AlterTableCmd *cmd;
811 
812  cmd = makeNode(AlterTableCmd);
813  cmd->subtype = AT_AlterColumnGenericOptions;
814  cmd->name = column->colname;
815  cmd->def = (Node *) column->fdwoptions;
816  cmd->behavior = DROP_RESTRICT;
817  cmd->missing_ok = false;
818 
819  stmt = makeNode(AlterTableStmt);
820  stmt->relation = cxt->relation;
821  stmt->cmds = NIL;
822  stmt->relkind = OBJECT_FOREIGN_TABLE;
823  stmt->cmds = lappend(stmt->cmds, cmd);
824 
825  cxt->alist = lappend(cxt->alist, stmt);
826  }
827 }
828 
829 /*
830  * transformTableConstraint
831  * transform a Constraint node within CREATE TABLE or ALTER TABLE
832  */
833 static void
834 transformTableConstraint(CreateStmtContext *cxt, Constraint *constraint)
835 {
836  switch (constraint->contype)
837  {
838  case CONSTR_PRIMARY:
839  if (cxt->isforeign)
840  ereport(ERROR,
841  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
842  errmsg("primary key constraints are not supported on foreign tables"),
843  parser_errposition(cxt->pstate,
844  constraint->location)));
845  cxt->ixconstraints = lappend(cxt->ixconstraints, constraint);
846  break;
847 
848  case CONSTR_UNIQUE:
849  if (cxt->isforeign)
850  ereport(ERROR,
851  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
852  errmsg("unique constraints are not supported on foreign tables"),
853  parser_errposition(cxt->pstate,
854  constraint->location)));
855  cxt->ixconstraints = lappend(cxt->ixconstraints, constraint);
856  break;
857 
858  case CONSTR_EXCLUSION:
859  if (cxt->isforeign)
860  ereport(ERROR,
861  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
862  errmsg("exclusion constraints are not supported on foreign tables"),
863  parser_errposition(cxt->pstate,
864  constraint->location)));
865  if (cxt->ispartitioned)
866  ereport(ERROR,
867  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
868  errmsg("exclusion constraints are not supported on partitioned tables"),
869  parser_errposition(cxt->pstate,
870  constraint->location)));
871  cxt->ixconstraints = lappend(cxt->ixconstraints, constraint);
872  break;
873 
874  case CONSTR_CHECK:
875  cxt->ckconstraints = lappend(cxt->ckconstraints, constraint);
876  break;
877 
878  case CONSTR_FOREIGN:
879  if (cxt->isforeign)
880  ereport(ERROR,
881  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
882  errmsg("foreign key constraints are not supported on foreign tables"),
883  parser_errposition(cxt->pstate,
884  constraint->location)));
885  cxt->fkconstraints = lappend(cxt->fkconstraints, constraint);
886  break;
887 
888  case CONSTR_NULL:
889  case CONSTR_NOTNULL:
890  case CONSTR_DEFAULT:
891  case CONSTR_ATTR_DEFERRABLE:
892  case CONSTR_ATTR_NOT_DEFERRABLE:
893  case CONSTR_ATTR_DEFERRED:
894  case CONSTR_ATTR_IMMEDIATE:
895  elog(ERROR, "invalid context for constraint type %d",
896  constraint->contype);
897  break;
898 
899  default:
900  elog(ERROR, "unrecognized constraint type: %d",
901  constraint->contype);
902  break;
903  }
904 }
905 
906 /*
907  * transformTableLikeClause
908  *
909  * Change the LIKE <srctable> portion of a CREATE TABLE statement into
910  * column definitions which recreate the user defined column portions of
911  * <srctable>.
912  */
913 static void
914 transformTableLikeClause(CreateStmtContext *cxt, TableLikeClause *table_like_clause)
915 {
916  AttrNumber parent_attno;
917  Relation relation;
918  TupleDesc tupleDesc;
919  TupleConstr *constr;
920  AttrNumber *attmap;
921  AclResult aclresult;
922  char *comment;
923  ParseCallbackState pcbstate;
924 
925  setup_parser_errposition_callback(&pcbstate, cxt->pstate,
926  table_like_clause->relation->location);
927 
928  /* we could support LIKE in many cases, but worry about it another day */
929  if (cxt->isforeign)
930  ereport(ERROR,
931  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
932  errmsg("LIKE is not supported for creating foreign tables")));
933 
934  relation = relation_openrv(table_like_clause->relation, AccessShareLock);
935 
936  if (relation->rd_rel->relkind != RELKIND_RELATION &&
937  relation->rd_rel->relkind != RELKIND_VIEW &&
938  relation->rd_rel->relkind != RELKIND_MATVIEW &&
939  relation->rd_rel->relkind != RELKIND_COMPOSITE_TYPE &&
940  relation->rd_rel->relkind != RELKIND_FOREIGN_TABLE &&
941  relation->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
942  ereport(ERROR,
943  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
944  errmsg("\"%s\" is not a table, view, materialized view, composite type, or foreign table",
945  RelationGetRelationName(relation))));
946 
947  cancel_parser_errposition_callback(&pcbstate);
948 
949  /*
950  * Check for privileges
951  */
952  if (relation->rd_rel->relkind == RELKIND_COMPOSITE_TYPE)
953  {
954  aclresult = pg_type_aclcheck(relation->rd_rel->reltype, GetUserId(),
955  ACL_USAGE);
956  if (aclresult != ACLCHECK_OK)
957  aclcheck_error(aclresult, OBJECT_TYPE,
958  RelationGetRelationName(relation));
959  }
960  else
961  {
962  aclresult = pg_class_aclcheck(RelationGetRelid(relation), GetUserId(),
963  ACL_SELECT);
964  if (aclresult != ACLCHECK_OK)
965  aclcheck_error(aclresult, get_relkind_objtype(relation->rd_rel->relkind),
966  RelationGetRelationName(relation));
967  }
968 
969  tupleDesc = RelationGetDescr(relation);
970  constr = tupleDesc->constr;
971 
972  /*
973  * Initialize column number map for map_variable_attnos(). We need this
974  * since dropped columns in the source table aren't copied, so the new
975  * table can have different column numbers.
976  */
977  attmap = (AttrNumber *) palloc0(sizeof(AttrNumber) * tupleDesc->natts);
978 
979  /*
980  * Insert the copied attributes into the cxt for the new table definition.
981  */
982  for (parent_attno = 1; parent_attno <= tupleDesc->natts;
983  parent_attno++)
984  {
985  Form_pg_attribute attribute = TupleDescAttr(tupleDesc,
986  parent_attno - 1);
987  char *attributeName = NameStr(attribute->attname);
988  ColumnDef *def;
989 
990  /*
991  * Ignore dropped columns in the parent. attmap entry is left zero.
992  */
993  if (attribute->attisdropped)
994  continue;
995 
996  /*
997  * Create a new column, which is marked as NOT inherited.
998  *
999  * For constraints, ONLY the NOT NULL constraint is inherited by the
1000  * new column definition per SQL99.
1001  */
1002  def = makeNode(ColumnDef);
1003  def->colname = pstrdup(attributeName);
1004  def->typeName = makeTypeNameFromOid(attribute->atttypid,
1005  attribute->atttypmod);
1006  def->inhcount = 0;
1007  def->is_local = true;
1008  def->is_not_null = attribute->attnotnull;
1009  def->is_from_type = false;
1010  def->storage = 0;
1011  def->raw_default = NULL;
1012  def->cooked_default = NULL;
1013  def->collClause = NULL;
1014  def->collOid = attribute->attcollation;
1015  def->constraints = NIL;
1016  def->location = -1;
1017 
1018  /*
1019  * Add to column list
1020  */
1021  cxt->columns = lappend(cxt->columns, def);
1022 
1023  attmap[parent_attno - 1] = list_length(cxt->columns);
1024 
1025  /*
1026  * Copy default, if present and it should be copied. We have separate
1027  * options for plain default expressions and GENERATED defaults.
1028  */
1029  if (attribute->atthasdef &&
1030  (attribute->attgenerated ?
1031  (table_like_clause->options & CREATE_TABLE_LIKE_GENERATED) :
1032  (table_like_clause->options & CREATE_TABLE_LIKE_DEFAULTS)))
1033  {
1034  Node *this_default = NULL;
1035  AttrDefault *attrdef;
1036  int i;
1037  bool found_whole_row;
1038 
1039  /* Find default in constraint structure */
1040  Assert(constr != NULL);
1041  attrdef = constr->defval;
1042  for (i = 0; i < constr->num_defval; i++)
1043  {
1044  if (attrdef[i].adnum == parent_attno)
1045  {
1046  this_default = stringToNode(attrdef[i].adbin);
1047  break;
1048  }
1049  }
1050  Assert(this_default != NULL);
1051 
1052  def->cooked_default = map_variable_attnos(this_default,
1053  1, 0,
1054  attmap, tupleDesc->natts,
1055  InvalidOid, &found_whole_row);
1056 
1057  /*
1058  * Prevent this for the same reason as for constraints below. Note
1059  * that defaults cannot contain any vars, so it's OK that the
1060  * error message refers to generated columns.
1061  */
1062  if (found_whole_row)
1063  ereport(ERROR,
1064  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1065  errmsg("cannot convert whole-row table reference"),
1066  errdetail("Generation expression for column \"%s\" contains a whole-row reference to table \"%s\".",
1067  attributeName,
1068  RelationGetRelationName(relation))));
1069 
1070  def->generated = attribute->attgenerated;
1071  }
1072 
1073  /*
1074  * Copy identity if requested
1075  */
1076  if (attribute->attidentity &&
1077  (table_like_clause->options & CREATE_TABLE_LIKE_IDENTITY))
1078  {
1079  Oid seq_relid;
1080  List *seq_options;
1081 
1082  /*
1083  * find sequence owned by old column; extract sequence parameters;
1084  * build new create sequence command
1085  */
1086  seq_relid = getIdentitySequence(RelationGetRelid(relation), attribute->attnum, false);
1087  seq_options = sequence_options(seq_relid);
1088  generateSerialExtraStmts(cxt, def,
1089  InvalidOid, seq_options, true,
1090  NULL, NULL);
1091  def->identity = attribute->attidentity;
1092  }
1093 
1094  /* Likewise, copy storage if requested */
1095  if (table_like_clause->options & CREATE_TABLE_LIKE_STORAGE)
1096  def->storage = attribute->attstorage;
1097  else
1098  def->storage = 0;
1099 
1100  /* Likewise, copy comment if requested */
1101  if ((table_like_clause->options & CREATE_TABLE_LIKE_COMMENTS) &&
1102  (comment = GetComment(attribute->attrelid,
1103  RelationRelationId,
1104  attribute->attnum)) != NULL)
1105  {
1106  CommentStmt *stmt = makeNode(CommentStmt);
1107 
1108  stmt->objtype = OBJECT_COLUMN;
1109  stmt->object = (Node *) list_make3(makeString(cxt->relation->schemaname),
1110  makeString(cxt->relation->relname),
1111  makeString(def->colname));
1112  stmt->comment = comment;
1113 
1114  cxt->alist = lappend(cxt->alist, stmt);
1115  }
1116  }
1117 
1118  /*
1119  * Copy CHECK constraints if requested, being careful to adjust attribute
1120  * numbers so they match the child.
1121  */
1122  if ((table_like_clause->options & CREATE_TABLE_LIKE_CONSTRAINTS) &&
1123  tupleDesc->constr)
1124  {
1125  int ccnum;
1126 
1127  for (ccnum = 0; ccnum < tupleDesc->constr->num_check; ccnum++)
1128  {
1129  char *ccname = tupleDesc->constr->check[ccnum].ccname;
1130  char *ccbin = tupleDesc->constr->check[ccnum].ccbin;
1131  Constraint *n = makeNode(Constraint);
1132  Node *ccbin_node;
1133  bool found_whole_row;
1134 
1135  ccbin_node = map_variable_attnos(stringToNode(ccbin),
1136  1, 0,
1137  attmap, tupleDesc->natts,
1138  InvalidOid, &found_whole_row);
1139 
1140  /*
1141  * We reject whole-row variables because the whole point of LIKE
1142  * is that the new table's rowtype might later diverge from the
1143  * parent's. So, while translation might be possible right now,
1144  * it wouldn't be possible to guarantee it would work in future.
1145  */
1146  if (found_whole_row)
1147  ereport(ERROR,
1148  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1149  errmsg("cannot convert whole-row table reference"),
1150  errdetail("Constraint \"%s\" contains a whole-row reference to table \"%s\".",
1151  ccname,
1152  RelationGetRelationName(relation))));
1153 
1154  n->contype = CONSTR_CHECK;
1155  n->location = -1;
1156  n->conname = pstrdup(ccname);
1157  n->raw_expr = NULL;
1158  n->cooked_expr = nodeToString(ccbin_node);
1159  cxt->ckconstraints = lappend(cxt->ckconstraints, n);
1160 
1161  /* Copy comment on constraint */
1162  if ((table_like_clause->options & CREATE_TABLE_LIKE_COMMENTS) &&
1163  (comment = GetComment(get_relation_constraint_oid(RelationGetRelid(relation),
1164  n->conname, false),
1165  ConstraintRelationId,
1166  0)) != NULL)
1167  {
1168  CommentStmt *stmt = makeNode(CommentStmt);
1169 
1170  stmt->objtype = OBJECT_TABCONSTRAINT;
1171  stmt->object = (Node *) list_make3(makeString(cxt->relation->schemaname),
1172  makeString(cxt->relation->relname),
1173  makeString(n->conname));
1174  stmt->comment = comment;
1175 
1176  cxt->alist = lappend(cxt->alist, stmt);
1177  }
1178  }
1179  }
1180 
1181  /*
1182  * Likewise, copy indexes if requested
1183  */
1184  if ((table_like_clause->options & CREATE_TABLE_LIKE_INDEXES) &&
1185  relation->rd_rel->relhasindex)
1186  {
1187  List *parent_indexes;
1188  ListCell *l;
1189 
1190  parent_indexes = RelationGetIndexList(relation);
1191 
1192  foreach(l, parent_indexes)
1193  {
1194  Oid parent_index_oid = lfirst_oid(l);
1195  Relation parent_index;
1196  IndexStmt *index_stmt;
1197 
1198  parent_index = index_open(parent_index_oid, AccessShareLock);
1199 
1200  /* Build CREATE INDEX statement to recreate the parent_index */
1201  index_stmt = generateClonedIndexStmt(cxt->relation,
1202  parent_index,
1203  attmap, tupleDesc->natts,
1204  NULL);
1205 
1206  /* Copy comment on index, if requested */
1207  if (table_like_clause->options & CREATE_TABLE_LIKE_COMMENTS)
1208  {
1209  comment = GetComment(parent_index_oid, RelationRelationId, 0);
1210 
1211  /*
1212  * We make use of IndexStmt's idxcomment option, so as not to
1213  * need to know now what name the index will have.
1214  */
1215  index_stmt->idxcomment = comment;
1216  }
1217 
1218  /* Save it in the inh_indexes list for the time being */
1219  cxt->inh_indexes = lappend(cxt->inh_indexes, index_stmt);
1220 
1221  index_close(parent_index, AccessShareLock);
1222  }
1223  }
1224 
1225  /*
1226  * Likewise, copy extended statistics if requested
1227  */
1228  if (table_like_clause->options & CREATE_TABLE_LIKE_STATISTICS)
1229  {
1230  List *parent_extstats;
1231  ListCell *l;
1232 
1233  parent_extstats = RelationGetStatExtList(relation);
1234 
1235  foreach(l, parent_extstats)
1236  {
1237  Oid parent_stat_oid = lfirst_oid(l);
1238  CreateStatsStmt *stats_stmt;
1239 
1240  stats_stmt = generateClonedExtStatsStmt(cxt->relation,
1241  RelationGetRelid(relation),
1242  parent_stat_oid);
1243 
1244  /* Copy comment on statistics object, if requested */
1245  if (table_like_clause->options & CREATE_TABLE_LIKE_COMMENTS)
1246  {
1247  comment = GetComment(parent_stat_oid, StatisticExtRelationId, 0);
1248 
1249  /*
1250  * We make use of CreateStatsStmt's stxcomment option, so as
1251  * not to need to know now what name the statistics will have.
1252  */
1253  stats_stmt->stxcomment = comment;
1254  }
1255 
1256  cxt->extstats = lappend(cxt->extstats, stats_stmt);
1257  }
1258 
1259  list_free(parent_extstats);
1260  }
1261 
1262  /*
1263  * Close the parent rel, but keep our AccessShareLock on it until xact
1264  * commit. That will prevent someone else from deleting or ALTERing the
1265  * parent before the child is committed.
1266  */
1267  table_close(relation, NoLock);
1268 }
1269 
1270 static void
1271 transformOfType(CreateStmtContext *cxt, TypeName *ofTypename)
1272 {
1273  HeapTuple tuple;
1274  TupleDesc tupdesc;
1275  int i;
1276  Oid ofTypeId;
1277 
1278  AssertArg(ofTypename);
1279 
1280  tuple = typenameType(NULL, ofTypename, NULL);
1281  check_of_type(tuple);
1282  ofTypeId = ((Form_pg_type) GETSTRUCT(tuple))->oid;
1283  ofTypename->typeOid = ofTypeId; /* cached for later */
1284 
1285  tupdesc = lookup_rowtype_tupdesc(ofTypeId, -1);
1286  for (i = 0; i < tupdesc->natts; i++)
1287  {
1288  Form_pg_attribute attr = TupleDescAttr(tupdesc, i);
1289  ColumnDef *n;
1290 
1291  if (attr->attisdropped)
1292  continue;
1293 
1294  n = makeNode(ColumnDef);
1295  n->colname = pstrdup(NameStr(attr->attname));
1296  n->typeName = makeTypeNameFromOid(attr->atttypid, attr->atttypmod);
1297  n->inhcount = 0;
1298  n->is_local = true;
1299  n->is_not_null = false;
1300  n->is_from_type = true;
1301  n->storage = 0;
1302  n->raw_default = NULL;
1303  n->cooked_default = NULL;
1304  n->collClause = NULL;
1305  n->collOid = attr->attcollation;
1306  n->constraints = NIL;
1307  n->location = -1;
1308  cxt->columns = lappend(cxt->columns, n);
1309  }
1310  DecrTupleDescRefCount(tupdesc);
1311 
1312  ReleaseSysCache(tuple);
1313 }
1314 
1315 /*
1316  * Generate an IndexStmt node using information from an already existing index
1317  * "source_idx".
1318  *
1319  * heapRel is stored into the IndexStmt's relation field, but we don't use it
1320  * otherwise; some callers pass NULL, if they don't need it to be valid.
1321  * (The target relation might not exist yet, so we mustn't try to access it.)
1322  *
1323  * Attribute numbers in expression Vars are adjusted according to attmap.
1324  *
1325  * If constraintOid isn't NULL, we store the OID of any constraint associated
1326  * with the index there.
1327  *
1328  * Unlike transformIndexConstraint, we don't make any effort to force primary
1329  * key columns to be NOT NULL. The larger cloning process this is part of
1330  * should have cloned their NOT NULL status separately (and DefineIndex will
1331  * complain if that fails to happen).
1332  */
1333 IndexStmt *
1334 generateClonedIndexStmt(RangeVar *heapRel, Relation source_idx,
1335  const AttrNumber *attmap, int attmap_length,
1336  Oid *constraintOid)
1337 {
1338  Oid source_relid = RelationGetRelid(source_idx);
1339  HeapTuple ht_idxrel;
1340  HeapTuple ht_idx;
1341  HeapTuple ht_am;
1342  Form_pg_class idxrelrec;
1343  Form_pg_index idxrec;
1344  Form_pg_am amrec;
1345  oidvector *indcollation;
1346  oidvector *indclass;
1347  IndexStmt *index;
1348  List *indexprs;
1349  ListCell *indexpr_item;
1350  Oid indrelid;
1351  int keyno;
1352  Oid keycoltype;
1353  Datum datum;
1354  bool isnull;
1355 
1356  if (constraintOid)
1357  *constraintOid = InvalidOid;
1358 
1359  /*
1360  * Fetch pg_class tuple of source index. We can't use the copy in the
1361  * relcache entry because it doesn't include optional fields.
1362  */
1363  ht_idxrel = SearchSysCache1(RELOID, ObjectIdGetDatum(source_relid));
1364  if (!HeapTupleIsValid(ht_idxrel))
1365  elog(ERROR, "cache lookup failed for relation %u", source_relid);
1366  idxrelrec = (Form_pg_class) GETSTRUCT(ht_idxrel);
1367 
1368  /* Fetch pg_index tuple for source index from relcache entry */
1369  ht_idx = source_idx->rd_indextuple;
1370  idxrec = (Form_pg_index) GETSTRUCT(ht_idx);
1371  indrelid = idxrec->indrelid;
1372 
1373  /* Fetch the pg_am tuple of the index' access method */
1374  ht_am = SearchSysCache1(AMOID, ObjectIdGetDatum(idxrelrec->relam));
1375  if (!HeapTupleIsValid(ht_am))
1376  elog(ERROR, "cache lookup failed for access method %u",
1377  idxrelrec->relam);
1378  amrec = (Form_pg_am) GETSTRUCT(ht_am);
1379 
1380  /* Extract indcollation from the pg_index tuple */
1381  datum = SysCacheGetAttr(INDEXRELID, ht_idx,
1382  Anum_pg_index_indcollation, &isnull);
1383  Assert(!isnull);
1384  indcollation = (oidvector *) DatumGetPointer(datum);
1385 
1386  /* Extract indclass from the pg_index tuple */
1387  datum = SysCacheGetAttr(INDEXRELID, ht_idx,
1388  Anum_pg_index_indclass, &isnull);
1389  Assert(!isnull);
1390  indclass = (oidvector *) DatumGetPointer(datum);
1391 
1392  /* Begin building the IndexStmt */
1393  index = makeNode(IndexStmt);
1394  index->relation = heapRel;
1395  index->accessMethod = pstrdup(NameStr(amrec->amname));
1396  if (OidIsValid(idxrelrec->reltablespace))
1397  index->tableSpace = get_tablespace_name(idxrelrec->reltablespace);
1398  else
1399  index->tableSpace = NULL;
1400  index->excludeOpNames = NIL;
1401  index->idxcomment = NULL;
1402  index->indexOid = InvalidOid;
1403  index->oldNode = InvalidOid;
1404  index->unique = idxrec->indisunique;
1405  index->primary = idxrec->indisprimary;
1406  index->transformed = true; /* don't need transformIndexStmt */
1407  index->concurrent = false;
1408  index->if_not_exists = false;
1409  index->reset_default_tblspc = false;
1410 
1411  /*
1412  * We don't try to preserve the name of the source index; instead, just
1413  * let DefineIndex() choose a reasonable name. (If we tried to preserve
1414  * the name, we'd get duplicate-relation-name failures unless the source
1415  * table was in a different schema.)
1416  */
1417  index->idxname = NULL;
1418 
1419  /*
1420  * If the index is marked PRIMARY or has an exclusion condition, it's
1421  * certainly from a constraint; else, if it's not marked UNIQUE, it
1422  * certainly isn't. If it is or might be from a constraint, we have to
1423  * fetch the pg_constraint record.
1424  */
1425  if (index->primary || index->unique || idxrec->indisexclusion)
1426  {
1427  Oid constraintId = get_index_constraint(source_relid);
1428 
1429  if (OidIsValid(constraintId))
1430  {
1431  HeapTuple ht_constr;
1432  Form_pg_constraint conrec;
1433 
1434  if (constraintOid)
1435  *constraintOid = constraintId;
1436 
1437  ht_constr = SearchSysCache1(CONSTROID,
1438  ObjectIdGetDatum(constraintId));
1439  if (!HeapTupleIsValid(ht_constr))
1440  elog(ERROR, "cache lookup failed for constraint %u",
1441  constraintId);
1442  conrec = (Form_pg_constraint) GETSTRUCT(ht_constr);
1443 
1444  index->isconstraint = true;
1445  index->deferrable = conrec->condeferrable;
1446  index->initdeferred = conrec->condeferred;
1447 
1448  /* If it's an exclusion constraint, we need the operator names */
1449  if (idxrec->indisexclusion)
1450  {
1451  Datum *elems;
1452  int nElems;
1453  int i;
1454 
1455  Assert(conrec->contype == CONSTRAINT_EXCLUSION);
1456  /* Extract operator OIDs from the pg_constraint tuple */
1457  datum = SysCacheGetAttr(CONSTROID, ht_constr,
1458  Anum_pg_constraint_conexclop,
1459  &isnull);
1460  if (isnull)
1461  elog(ERROR, "null conexclop for constraint %u",
1462  constraintId);
1463 
1464  deconstruct_array(DatumGetArrayTypeP(datum),
1465  OIDOID, sizeof(Oid), true, 'i',
1466  &elems, NULL, &nElems);
1467 
1468  for (i = 0; i < nElems; i++)
1469  {
1470  Oid operid = DatumGetObjectId(elems[i]);
1471  HeapTuple opertup;
1472  Form_pg_operator operform;
1473  char *oprname;
1474  char *nspname;
1475  List *namelist;
1476 
1477  opertup = SearchSysCache1(OPEROID,
1478  ObjectIdGetDatum(operid));
1479  if (!HeapTupleIsValid(opertup))
1480  elog(ERROR, "cache lookup failed for operator %u",
1481  operid);
1482  operform = (Form_pg_operator) GETSTRUCT(opertup);
1483  oprname = pstrdup(NameStr(operform->oprname));
1484  /* For simplicity we always schema-qualify the op name */
1485  nspname = get_namespace_name(operform->oprnamespace);
1486  namelist = list_make2(makeString(nspname),
1487  makeString(oprname));
1488  index->excludeOpNames = lappend(index->excludeOpNames,
1489  namelist);
1490  ReleaseSysCache(opertup);
1491  }
1492  }
1493 
1494  ReleaseSysCache(ht_constr);
1495  }
1496  else
1497  index->isconstraint = false;
1498  }
1499  else
1500  index->isconstraint = false;
1501 
1502  /* Get the index expressions, if any */
1503  datum = SysCacheGetAttr(INDEXRELID, ht_idx,
1504  Anum_pg_index_indexprs, &isnull);
1505  if (!isnull)
1506  {
1507  char *exprsString;
1508 
1509  exprsString = TextDatumGetCString(datum);
1510  indexprs = (List *) stringToNode(exprsString);
1511  }
1512  else
1513  indexprs = NIL;
1514 
1515  /* Build the list of IndexElem */
1516  index->indexParams = NIL;
1517  index->indexIncludingParams = NIL;
1518 
1519  indexpr_item = list_head(indexprs);
1520  for (keyno = 0; keyno < idxrec->indnkeyatts; keyno++)
1521  {
1522  IndexElem *iparam;
1523  AttrNumber attnum = idxrec->indkey.values[keyno];
1524  Form_pg_attribute attr = TupleDescAttr(RelationGetDescr(source_idx),
1525  keyno);
1526  int16 opt = source_idx->rd_indoption[keyno];
1527 
1528  iparam = makeNode(IndexElem);
1529 
1530  if (AttributeNumberIsValid(attnum))
1531  {
1532  /* Simple index column */
1533  char *attname;
1534 
1535  attname = get_attname(indrelid, attnum, false);
1536  keycoltype = get_atttype(indrelid, attnum);
1537 
1538  iparam->name = attname;
1539  iparam->expr = NULL;
1540  }
1541  else
1542  {
1543  /* Expressional index */
1544  Node *indexkey;
1545  bool found_whole_row;
1546 
1547  if (indexpr_item == NULL)
1548  elog(ERROR, "too few entries in indexprs list");
1549  indexkey = (Node *) lfirst(indexpr_item);
1550  indexpr_item = lnext(indexprs, indexpr_item);
1551 
1552  /* Adjust Vars to match new table's column numbering */
1553  indexkey = map_variable_attnos(indexkey,
1554  1, 0,
1555  attmap, attmap_length,
1556  InvalidOid, &found_whole_row);
1557 
1558  /* As in transformTableLikeClause, reject whole-row variables */
1559  if (found_whole_row)
1560  ereport(ERROR,
1561  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1562  errmsg("cannot convert whole-row table reference"),
1563  errdetail("Index \"%s\" contains a whole-row table reference.",
1564  RelationGetRelationName(source_idx))));
1565 
1566  iparam->name = NULL;
1567  iparam->expr = indexkey;
1568 
1569  keycoltype = exprType(indexkey);
1570  }
1571 
1572  /* Copy the original index column name */
1573  iparam->indexcolname = pstrdup(NameStr(attr->attname));
1574 
1575  /* Add the collation name, if non-default */
1576  iparam->collation = get_collation(indcollation->values[keyno], keycoltype);
1577 
1578  /* Add the operator class name, if non-default */
1579  iparam->opclass = get_opclass(indclass->values[keyno], keycoltype);
1580 
1581  iparam->ordering = SORTBY_DEFAULT;
1582  iparam->nulls_ordering = SORTBY_NULLS_DEFAULT;
1583 
1584  /* Adjust options if necessary */
1585  if (source_idx->rd_indam->amcanorder)
1586  {
1587  /*
1588  * If it supports sort ordering, copy DESC and NULLS opts. Don't
1589  * set non-default settings unnecessarily, though, so as to
1590  * improve the chance of recognizing equivalence to constraint
1591  * indexes.
1592  */
1593  if (opt & INDOPTION_DESC)
1594  {
1595  iparam->ordering = SORTBY_DESC;
1596  if ((opt & INDOPTION_NULLS_FIRST) == 0)
1597  iparam->nulls_ordering = SORTBY_NULLS_LAST;
1598  }
1599  else
1600  {
1601  if (opt & INDOPTION_NULLS_FIRST)
1602  iparam->nulls_ordering = SORTBY_NULLS_FIRST;
1603  }
1604  }
1605 
1606  index->indexParams = lappend(index->indexParams, iparam);
1607  }
1608 
1609  /* Handle included columns separately */
1610  for (keyno = idxrec->indnkeyatts; keyno < idxrec->indnatts; keyno++)
1611  {
1612  IndexElem *iparam;
1613  AttrNumber attnum = idxrec->indkey.values[keyno];
1614  Form_pg_attribute attr = TupleDescAttr(RelationGetDescr(source_idx),
1615  keyno);
1616 
1617  iparam = makeNode(IndexElem);
1618 
1619  if (AttributeNumberIsValid(attnum))
1620  {
1621  /* Simple index column */
1622  char *attname;
1623 
1624  attname = get_attname(indrelid, attnum, false);
1625  keycoltype = get_atttype(indrelid, attnum);
1626 
1627  iparam->name = attname;
1628  iparam->expr = NULL;
1629  }
1630  else
1631  ereport(ERROR,
1632  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1633  errmsg("expressions are not supported in included columns")));
1634 
1635  /* Copy the original index column name */
1636  iparam->indexcolname = pstrdup(NameStr(attr->attname));
1637 
1638  index->indexIncludingParams = lappend(index->indexIncludingParams, iparam);
1639  }
1640  /* Copy reloptions if any */
1641  datum = SysCacheGetAttr(RELOID, ht_idxrel,
1642  Anum_pg_class_reloptions, &isnull);
1643  if (!isnull)
1644  index->options = untransformRelOptions(datum);
1645 
1646  /* If it's a partial index, decompile and append the predicate */
1647  datum = SysCacheGetAttr(INDEXRELID, ht_idx,
1648  Anum_pg_index_indpred, &isnull);
1649  if (!isnull)
1650  {
1651  char *pred_str;
1652  Node *pred_tree;
1653  bool found_whole_row;
1654 
1655  /* Convert text string to node tree */
1656  pred_str = TextDatumGetCString(datum);
1657  pred_tree = (Node *) stringToNode(pred_str);
1658 
1659  /* Adjust Vars to match new table's column numbering */
1660  pred_tree = map_variable_attnos(pred_tree,
1661  1, 0,
1662  attmap, attmap_length,
1663  InvalidOid, &found_whole_row);
1664 
1665  /* As in transformTableLikeClause, reject whole-row variables */
1666  if (found_whole_row)
1667  ereport(ERROR,
1668  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1669  errmsg("cannot convert whole-row table reference"),
1670  errdetail("Index \"%s\" contains a whole-row table reference.",
1671  RelationGetRelationName(source_idx))));
1672 
1673  index->whereClause = pred_tree;
1674  }
1675 
1676  /* Clean up */
1677  ReleaseSysCache(ht_idxrel);
1678  ReleaseSysCache(ht_am);
1679 
1680  return index;
1681 }
1682 
1683 /*
1684  * Generate a CreateStatsStmt node using information from an already existing
1685  * extended statistic "source_statsid", for the rel identified by heapRel and
1686  * heapRelid.
1687  */
1688 static CreateStatsStmt *
1689 generateClonedExtStatsStmt(RangeVar *heapRel, Oid heapRelid,
1690  Oid source_statsid)
1691 {
1692  HeapTuple ht_stats;
1693  Form_pg_statistic_ext statsrec;
1694  CreateStatsStmt *stats;
1695  List *stat_types = NIL;
1696  List *def_names = NIL;
1697  bool isnull;
1698  Datum datum;
1699  ArrayType *arr;
1700  char *enabled;
1701  int i;
1702 
1703  Assert(OidIsValid(heapRelid));
1704  Assert(heapRel != NULL);
1705 
1706  /*
1707  * Fetch pg_statistic_ext tuple of source statistics object.
1708  */
1709  ht_stats = SearchSysCache1(STATEXTOID, ObjectIdGetDatum(source_statsid));
1710  if (!HeapTupleIsValid(ht_stats))
1711  elog(ERROR, "cache lookup failed for statistics object %u", source_statsid);
1712  statsrec = (Form_pg_statistic_ext) GETSTRUCT(ht_stats);
1713 
1714  /* Determine which statistics types exist */
1715  datum = SysCacheGetAttr(STATEXTOID, ht_stats,
1716  Anum_pg_statistic_ext_stxkind, &isnull);
1717  Assert(!isnull);
1718  arr = DatumGetArrayTypeP(datum);
1719  if (ARR_NDIM(arr) != 1 ||
1720  ARR_HASNULL(arr) ||
1721  ARR_ELEMTYPE(arr) != CHAROID)
1722  elog(ERROR, "stxkind is not a 1-D char array");
1723  enabled = (char *) ARR_DATA_PTR(arr);
1724  for (i = 0; i < ARR_DIMS(arr)[0]; i++)
1725  {
1726  if (enabled[i] == STATS_EXT_NDISTINCT)
1727  stat_types = lappend(stat_types, makeString("ndistinct"));
1728  else if (enabled[i] == STATS_EXT_DEPENDENCIES)
1729  stat_types = lappend(stat_types, makeString("dependencies"));
1730  else if (enabled[i] == STATS_EXT_MCV)
1731  stat_types = lappend(stat_types, makeString("mcv"));
1732  else
1733  elog(ERROR, "unrecognized statistics kind %c", enabled[i]);
1734  }
1735 
1736  /* Determine which columns the statistics are on */
1737  for (i = 0; i < statsrec->stxkeys.dim1; i++)
1738  {
1739  ColumnRef *cref = makeNode(ColumnRef);
1740  AttrNumber attnum = statsrec->stxkeys.values[i];
1741 
1742  cref->fields = list_make1(makeString(get_attname(heapRelid,
1743  attnum, false)));
1744  cref->location = -1;
1745 
1746  def_names = lappend(def_names, cref);
1747  }
1748 
1749  /* finally, build the output node */
1750  stats = makeNode(CreateStatsStmt);
1751  stats->defnames = NULL;
1752  stats->stat_types = stat_types;
1753  stats->exprs = def_names;
1754  stats->relations = list_make1(heapRel);
1755  stats->stxcomment = NULL;
1756  stats->if_not_exists = false;
1757 
1758  /* Clean up */
1759  ReleaseSysCache(ht_stats);
1760 
1761  return stats;
1762 }
1763 
1764 /*
1765  * get_collation - fetch qualified name of a collation
1766  *
1767  * If collation is InvalidOid or is the default for the given actual_datatype,
1768  * then the return value is NIL.
1769  */
1770 static List *
1771 get_collation(Oid collation, Oid actual_datatype)
1772 {
1773  List *result;
1774  HeapTuple ht_coll;
1775  Form_pg_collation coll_rec;
1776  char *nsp_name;
1777  char *coll_name;
1778 
1779  if (!OidIsValid(collation))
1780  return NIL; /* easy case */
1781  if (collation == get_typcollation(actual_datatype))
1782  return NIL; /* just let it default */
1783 
1784  ht_coll = SearchSysCache1(COLLOID, ObjectIdGetDatum(collation));
1785  if (!HeapTupleIsValid(ht_coll))
1786  elog(ERROR, "cache lookup failed for collation %u", collation);
1787  coll_rec = (Form_pg_collation) GETSTRUCT(ht_coll);
1788 
1789  /* For simplicity, we always schema-qualify the name */
1790  nsp_name = get_namespace_name(coll_rec->collnamespace);
1791  coll_name = pstrdup(NameStr(coll_rec->collname));
1792  result = list_make2(makeString(nsp_name), makeString(coll_name));
1793 
1794  ReleaseSysCache(ht_coll);
1795  return result;
1796 }
1797 
1798 /*
1799  * get_opclass - fetch qualified name of an index operator class
1800  *
1801  * If the opclass is the default for the given actual_datatype, then
1802  * the return value is NIL.
1803  */
1804 static List *
1805 get_opclass(Oid opclass, Oid actual_datatype)
1806 {
1807  List *result = NIL;
1808  HeapTuple ht_opc;
1809  Form_pg_opclass opc_rec;
1810 
1811  ht_opc = SearchSysCache1(CLAOID, ObjectIdGetDatum(opclass));
1812  if (!HeapTupleIsValid(ht_opc))
1813  elog(ERROR, "cache lookup failed for opclass %u", opclass);
1814  opc_rec = (Form_pg_opclass) GETSTRUCT(ht_opc);
1815 
1816  if (GetDefaultOpClass(actual_datatype, opc_rec->opcmethod) != opclass)
1817  {
1818  /* For simplicity, we always schema-qualify the name */
1819  char *nsp_name = get_namespace_name(opc_rec->opcnamespace);
1820  char *opc_name = pstrdup(NameStr(opc_rec->opcname));
1821 
1822  result = list_make2(makeString(nsp_name), makeString(opc_name));
1823  }
1824 
1825  ReleaseSysCache(ht_opc);
1826  return result;
1827 }
1828 
1829 
1830 /*
1831  * transformIndexConstraints
1832  * Handle UNIQUE, PRIMARY KEY, EXCLUDE constraints, which create indexes.
1833  * We also merge in any index definitions arising from
1834  * LIKE ... INCLUDING INDEXES.
1835  */
1836 static void
1837 transformIndexConstraints(CreateStmtContext *cxt)
1838 {
1839  IndexStmt *index;
1840  List *indexlist = NIL;
1841  List *finalindexlist = NIL;
1842  ListCell *lc;
1843 
1844  /*
1845  * Run through the constraints that need to generate an index. For PRIMARY
1846  * KEY, mark each column as NOT NULL and create an index. For UNIQUE or
1847  * EXCLUDE, create an index as for PRIMARY KEY, but do not insist on NOT
1848  * NULL.
1849  */
1850  foreach(lc, cxt->ixconstraints)
1851  {
1852  Constraint *constraint = lfirst_node(Constraint, lc);
1853 
1854  Assert(constraint->contype == CONSTR_PRIMARY ||
1855  constraint->contype == CONSTR_UNIQUE ||
1856  constraint->contype == CONSTR_EXCLUSION);
1857 
1858  index = transformIndexConstraint(constraint, cxt);
1859 
1860  indexlist = lappend(indexlist, index);
1861  }
1862 
1863  /* Add in any indexes defined by LIKE ... INCLUDING INDEXES */
1864  foreach(lc, cxt->inh_indexes)
1865  {
1866  index = (IndexStmt *) lfirst(lc);
1867 
1868  if (index->primary)
1869  {
1870  if (cxt->pkey != NULL)
1871  ereport(ERROR,
1872  (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
1873  errmsg("multiple primary keys for table \"%s\" are not allowed",
1874  cxt->relation->relname)));
1875  cxt->pkey = index;
1876  }
1877 
1878  indexlist = lappend(indexlist, index);
1879  }
1880 
1881  /*
1882  * Scan the index list and remove any redundant index specifications. This
1883  * can happen if, for instance, the user writes UNIQUE PRIMARY KEY. A
1884  * strict reading of SQL would suggest raising an error instead, but that
1885  * strikes me as too anal-retentive. - tgl 2001-02-14
1886  *
1887  * XXX in ALTER TABLE case, it'd be nice to look for duplicate
1888  * pre-existing indexes, too.
1889  */
1890  if (cxt->pkey != NULL)
1891  {
1892  /* Make sure we keep the PKEY index in preference to others... */
1893  finalindexlist = list_make1(cxt->pkey);
1894  }
1895 
1896  foreach(lc, indexlist)
1897  {
1898  bool keep = true;
1899  ListCell *k;
1900 
1901  index = lfirst(lc);
1902 
1903  /* if it's pkey, it's already in finalindexlist */
1904  if (index == cxt->pkey)
1905  continue;
1906 
1907  foreach(k, finalindexlist)
1908  {
1909  IndexStmt *priorindex = lfirst(k);
1910 
1911  if (equal(index->indexParams, priorindex->indexParams) &&
1912  equal(index->indexIncludingParams, priorindex->indexIncludingParams) &&
1913  equal(index->whereClause, priorindex->whereClause) &&
1914  equal(index->excludeOpNames, priorindex->excludeOpNames) &&
1915  strcmp(index->accessMethod, priorindex->accessMethod) == 0 &&
1916  index->deferrable == priorindex->deferrable &&
1917  index->initdeferred == priorindex->initdeferred)
1918  {
1919  priorindex->unique |= index->unique;
1920 
1921  /*
1922  * If the prior index is as yet unnamed, and this one is
1923  * named, then transfer the name to the prior index. This
1924  * ensures that if we have named and unnamed constraints,
1925  * we'll use (at least one of) the names for the index.
1926  */
1927  if (priorindex->idxname == NULL)
1928  priorindex->idxname = index->idxname;
1929  keep = false;
1930  break;
1931  }
1932  }
1933 
1934  if (keep)
1935  finalindexlist = lappend(finalindexlist, index);
1936  }
1937 
1938  /*
1939  * Now append all the IndexStmts to cxt->alist. If we generated an ALTER
1940  * TABLE SET NOT NULL statement to support a primary key, it's already in
1941  * cxt->alist.
1942  */
1943  cxt->alist = list_concat(cxt->alist, finalindexlist);
1944 }
1945 
1946 /*
1947  * transformIndexConstraint
1948  * Transform one UNIQUE, PRIMARY KEY, or EXCLUDE constraint for
1949  * transformIndexConstraints.
1950  *
1951  * We return an IndexStmt. For a PRIMARY KEY constraint, we additionally
1952  * produce NOT NULL constraints, either by marking ColumnDefs in cxt->columns
1953  * as is_not_null or by adding an ALTER TABLE SET NOT NULL command to
1954  * cxt->alist.
1955  */
1956 static IndexStmt *
1957 transformIndexConstraint(Constraint *constraint, CreateStmtContext *cxt)
1958 {
1959  IndexStmt *index;
1960  List *notnullcmds = NIL;
1961  ListCell *lc;
1962 
1963  index = makeNode(IndexStmt);
1964 
1965  index->unique = (constraint->contype != CONSTR_EXCLUSION);
1966  index->primary = (constraint->contype == CONSTR_PRIMARY);
1967  if (index->primary)
1968  {
1969  if (cxt->pkey != NULL)
1970  ereport(ERROR,
1971  (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
1972  errmsg("multiple primary keys for table \"%s\" are not allowed",
1973  cxt->relation->relname),
1974  parser_errposition(cxt->pstate, constraint->location)));
1975  cxt->pkey = index;
1976 
1977  /*
1978  * In ALTER TABLE case, a primary index might already exist, but
1979  * DefineIndex will check for it.
1980  */
1981  }
1982  index->isconstraint = true;
1983  index->deferrable = constraint->deferrable;
1984  index->initdeferred = constraint->initdeferred;
1985 
1986  if (constraint->conname != NULL)
1987  index->idxname = pstrdup(constraint->conname);
1988  else
1989  index->idxname = NULL; /* DefineIndex will choose name */
1990 
1991  index->relation = cxt->relation;
1992  index->accessMethod = constraint->access_method ? constraint->access_method : DEFAULT_INDEX_TYPE;
1993  index->options = constraint->options;
1994  index->tableSpace = constraint->indexspace;
1995  index->whereClause = constraint->where_clause;
1996  index->indexParams = NIL;
1997  index->indexIncludingParams = NIL;
1998  index->excludeOpNames = NIL;
1999  index->idxcomment = NULL;
2000  index->indexOid = InvalidOid;
2001  index->oldNode = InvalidOid;
2002  index->transformed = false;
2003  index->concurrent = false;
2004  index->if_not_exists = false;
2005  index->reset_default_tblspc = constraint->reset_default_tblspc;
2006 
2007  /*
2008  * If it's ALTER TABLE ADD CONSTRAINT USING INDEX, look up the index and
2009  * verify it's usable, then extract the implied column name list. (We
2010  * will not actually need the column name list at runtime, but we need it
2011  * now to check for duplicate column entries below.)
2012  */
2013  if (constraint->indexname != NULL)
2014  {
2015  char *index_name = constraint->indexname;
2016  Relation heap_rel = cxt->rel;
2017  Oid index_oid;
2018  Relation index_rel;
2019  Form_pg_index index_form;
2020  oidvector *indclass;
2021  Datum indclassDatum;
2022  bool isnull;
2023  int i;
2024 
2025  /* Grammar should not allow this with explicit column list */
2026  Assert(constraint->keys == NIL);
2027 
2028  /* Grammar should only allow PRIMARY and UNIQUE constraints */
2029  Assert(constraint->contype == CONSTR_PRIMARY ||
2030  constraint->contype == CONSTR_UNIQUE);
2031 
2032  /* Must be ALTER, not CREATE, but grammar doesn't enforce that */
2033  if (!cxt->isalter)
2034  ereport(ERROR,
2035  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2036  errmsg("cannot use an existing index in CREATE TABLE"),
2037  parser_errposition(cxt->pstate, constraint->location)));
2038 
2039  /* Look for the index in the same schema as the table */
2040  index_oid = get_relname_relid(index_name, RelationGetNamespace(heap_rel));
2041 
2042  if (!OidIsValid(index_oid))
2043  ereport(ERROR,
2044  (errcode(ERRCODE_UNDEFINED_OBJECT),
2045  errmsg("index \"%s\" does not exist", index_name),
2046  parser_errposition(cxt->pstate, constraint->location)));
2047 
2048  /* Open the index (this will throw an error if it is not an index) */
2049  index_rel = index_open(index_oid, AccessShareLock);
2050  index_form = index_rel->rd_index;
2051 
2052  /* Check that it does not have an associated constraint already */
2053  if (OidIsValid(get_index_constraint(index_oid)))
2054  ereport(ERROR,
2055  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
2056  errmsg("index \"%s\" is already associated with a constraint",
2057  index_name),
2058  parser_errposition(cxt->pstate, constraint->location)));
2059 
2060  /* Perform validity checks on the index */
2061  if (index_form->indrelid != RelationGetRelid(heap_rel))
2062  ereport(ERROR,
2063  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
2064  errmsg("index \"%s\" does not belong to table \"%s\"",
2065  index_name, RelationGetRelationName(heap_rel)),
2066  parser_errposition(cxt->pstate, constraint->location)));
2067 
2068  if (!index_form->indisvalid)
2069  ereport(ERROR,
2070  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
2071  errmsg("index \"%s\" is not valid", index_name),
2072  parser_errposition(cxt->pstate, constraint->location)));
2073 
2074  if (!index_form->indisunique)
2075  ereport(ERROR,
2076  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2077  errmsg("\"%s\" is not a unique index", index_name),
2078  errdetail("Cannot create a primary key or unique constraint using such an index."),
2079  parser_errposition(cxt->pstate, constraint->location)));
2080 
2081  if (RelationGetIndexExpressions(index_rel) != NIL)
2082  ereport(ERROR,
2083  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2084  errmsg("index \"%s\" contains expressions", index_name),
2085  errdetail("Cannot create a primary key or unique constraint using such an index."),
2086  parser_errposition(cxt->pstate, constraint->location)));
2087 
2088  if (RelationGetIndexPredicate(index_rel) != NIL)
2089  ereport(ERROR,
2090  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2091  errmsg("\"%s\" is a partial index", index_name),
2092  errdetail("Cannot create a primary key or unique constraint using such an index."),
2093  parser_errposition(cxt->pstate, constraint->location)));
2094 
2095  /*
2096  * It's probably unsafe to change a deferred index to non-deferred. (A
2097  * non-constraint index couldn't be deferred anyway, so this case
2098  * should never occur; no need to sweat, but let's check it.)
2099  */
2100  if (!index_form->indimmediate && !constraint->deferrable)
2101  ereport(ERROR,
2102  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2103  errmsg("\"%s\" is a deferrable index", index_name),
2104  errdetail("Cannot create a non-deferrable constraint using a deferrable index."),
2105  parser_errposition(cxt->pstate, constraint->location)));
2106 
2107  /*
2108  * Insist on it being a btree. That's the only kind that supports
2109  * uniqueness at the moment anyway; but we must have an index that
2110  * exactly matches what you'd get from plain ADD CONSTRAINT syntax,
2111  * else dump and reload will produce a different index (breaking
2112  * pg_upgrade in particular).
2113  */
2114  if (index_rel->rd_rel->relam != get_index_am_oid(DEFAULT_INDEX_TYPE, false))
2115  ereport(ERROR,
2116  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2117  errmsg("index \"%s\" is not a btree", index_name),
2118  parser_errposition(cxt->pstate, constraint->location)));
2119 
2120  /* Must get indclass the hard way */
2121  indclassDatum = SysCacheGetAttr(INDEXRELID, index_rel->rd_indextuple,
2122  Anum_pg_index_indclass, &isnull);
2123  Assert(!isnull);
2124  indclass = (oidvector *) DatumGetPointer(indclassDatum);
2125 
2126  for (i = 0; i < index_form->indnatts; i++)
2127  {
2128  int16 attnum = index_form->indkey.values[i];
2129  const FormData_pg_attribute *attform;
2130  char *attname;
2131  Oid defopclass;
2132 
2133  /*
2134  * We shouldn't see attnum == 0 here, since we already rejected
2135  * expression indexes. If we do, SystemAttributeDefinition will
2136  * throw an error.
2137  */
2138  if (attnum > 0)
2139  {
2140  Assert(attnum <= heap_rel->rd_att->natts);
2141  attform = TupleDescAttr(heap_rel->rd_att, attnum - 1);
2142  }
2143  else
2144  attform = SystemAttributeDefinition(attnum);
2145  attname = pstrdup(NameStr(attform->attname));
2146 
2147  if (i < index_form->indnkeyatts)
2148  {
2149  /*
2150  * Insist on default opclass, collation, and sort options.
2151  * While the index would still work as a constraint with
2152  * non-default settings, it might not provide exactly the same
2153  * uniqueness semantics as you'd get from a normally-created
2154  * constraint; and there's also the dump/reload problem
2155  * mentioned above.
2156  */
2157  defopclass = GetDefaultOpClass(attform->atttypid,
2158  index_rel->rd_rel->relam);
2159  if (indclass->values[i] != defopclass ||
2160  attform->attcollation != index_rel->rd_indcollation[i] ||
2161  index_rel->rd_indoption[i] != 0)
2162  ereport(ERROR,
2163  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2164  errmsg("index \"%s\" column number %d does not have default sorting behavior", index_name, i + 1),
2165  errdetail("Cannot create a primary key or unique constraint using such an index."),
2166  parser_errposition(cxt->pstate, constraint->location)));
2167 
2168  constraint->keys = lappend(constraint->keys, makeString(attname));
2169  }
2170  else
2171  constraint->including = lappend(constraint->including, makeString(attname));
2172  }
2173 
2174  /* Close the index relation but keep the lock */
2175  relation_close(index_rel, NoLock);
2176 
2177  index->indexOid = index_oid;
2178  }
2179 
2180  /*
2181  * If it's an EXCLUDE constraint, the grammar returns a list of pairs of
2182  * IndexElems and operator names. We have to break that apart into
2183  * separate lists.
2184  */
2185  if (constraint->contype == CONSTR_EXCLUSION)
2186  {
2187  foreach(lc, constraint->exclusions)
2188  {
2189  List *pair = (List *) lfirst(lc);
2190  IndexElem *elem;
2191  List *opname;
2192 
2193  Assert(list_length(pair) == 2);
2194  elem = linitial_node(IndexElem, pair);
2195  opname = lsecond_node(List, pair);
2196 
2197  index->indexParams = lappend(index->indexParams, elem);
2198  index->excludeOpNames = lappend(index->excludeOpNames, opname);
2199  }
2200  }
2201 
2202  /*
2203  * For UNIQUE and PRIMARY KEY, we just have a list of column names.
2204  *
2205  * Make sure referenced keys exist. If we are making a PRIMARY KEY index,
2206  * also make sure they are NOT NULL.
2207  */
2208  else
2209  {
2210  foreach(lc, constraint->keys)
2211  {
2212  char *key = strVal(lfirst(lc));
2213  bool found = false;
2214  bool forced_not_null = false;
2215  ColumnDef *column = NULL;
2216  ListCell *columns;
2217  IndexElem *iparam;
2218 
2219  /* Make sure referenced column exists. */
2220  foreach(columns, cxt->columns)
2221  {
2222  column = castNode(ColumnDef, lfirst(columns));
2223  if (strcmp(column->colname, key) == 0)
2224  {
2225  found = true;
2226  break;
2227  }
2228  }
2229  if (found)
2230  {
2231  /*
2232  * column is defined in the new table. For PRIMARY KEY, we
2233  * can apply the NOT NULL constraint cheaply here ... unless
2234  * the column is marked is_from_type, in which case marking it
2235  * here would be ineffective (see MergeAttributes).
2236  */
2237  if (constraint->contype == CONSTR_PRIMARY &&
2238  !column->is_from_type)
2239  {
2240  column->is_not_null = true;
2241  forced_not_null = true;
2242  }
2243  }
2244  else if (SystemAttributeByName(key) != NULL)
2245  {
2246  /*
2247  * column will be a system column in the new table, so accept
2248  * it. System columns can't ever be null, so no need to worry
2249  * about PRIMARY/NOT NULL constraint.
2250  */
2251  found = true;
2252  }
2253  else if (cxt->inhRelations)
2254  {
2255  /* try inherited tables */
2256  ListCell *inher;
2257 
2258  foreach(inher, cxt->inhRelations)
2259  {
2260  RangeVar *inh = castNode(RangeVar, lfirst(inher));
2261  Relation rel;
2262  int count;
2263 
2264  rel = table_openrv(inh, AccessShareLock);
2265  /* check user requested inheritance from valid relkind */
2266  if (rel->rd_rel->relkind != RELKIND_RELATION &&
2267  rel->rd_rel->relkind != RELKIND_FOREIGN_TABLE &&
2268  rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
2269  ereport(ERROR,
2270  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2271  errmsg("inherited relation \"%s\" is not a table or foreign table",
2272  inh->relname)));
2273  for (count = 0; count < rel->rd_att->natts; count++)
2274  {
2275  Form_pg_attribute inhattr = TupleDescAttr(rel->rd_att,
2276  count);
2277  char *inhname = NameStr(inhattr->attname);
2278 
2279  if (inhattr->attisdropped)
2280  continue;
2281  if (strcmp(key, inhname) == 0)
2282  {
2283  found = true;
2284 
2285  /*
2286  * It's tempting to set forced_not_null if the
2287  * parent column is already NOT NULL, but that
2288  * seems unsafe because the column's NOT NULL
2289  * marking might disappear between now and
2290  * execution. Do the runtime check to be safe.
2291  */
2292  break;
2293  }
2294  }
2295  table_close(rel, NoLock);
2296  if (found)
2297  break;
2298  }
2299  }
2300 
2301  /*
2302  * In the ALTER TABLE case, don't complain about index keys not
2303  * created in the command; they may well exist already.
2304  * DefineIndex will complain about them if not.
2305  */
2306  if (!found && !cxt->isalter)
2307  ereport(ERROR,
2308  (errcode(ERRCODE_UNDEFINED_COLUMN),
2309  errmsg("column \"%s\" named in key does not exist", key),
2310  parser_errposition(cxt->pstate, constraint->location)));
2311 
2312  /* Check for PRIMARY KEY(foo, foo) */
2313  foreach(columns, index->indexParams)
2314  {
2315  iparam = (IndexElem *) lfirst(columns);
2316  if (iparam->name && strcmp(key, iparam->name) == 0)
2317  {
2318  if (index->primary)
2319  ereport(ERROR,
2320  (errcode(ERRCODE_DUPLICATE_COLUMN),
2321  errmsg("column \"%s\" appears twice in primary key constraint",
2322  key),
2323  parser_errposition(cxt->pstate, constraint->location)));
2324  else
2325  ereport(ERROR,
2326  (errcode(ERRCODE_DUPLICATE_COLUMN),
2327  errmsg("column \"%s\" appears twice in unique constraint",
2328  key),
2329  parser_errposition(cxt->pstate, constraint->location)));
2330  }
2331  }
2332 
2333  /* OK, add it to the index definition */
2334  iparam = makeNode(IndexElem);
2335  iparam->name = pstrdup(key);
2336  iparam->expr = NULL;
2337  iparam->indexcolname = NULL;
2338  iparam->collation = NIL;
2339  iparam->opclass = NIL;
2340  iparam->ordering = SORTBY_DEFAULT;
2341  iparam->nulls_ordering = SORTBY_NULLS_DEFAULT;
2342  index->indexParams = lappend(index->indexParams, iparam);
2343 
2344  /*
2345  * For a primary-key column, also create an item for ALTER TABLE
2346  * SET NOT NULL if we couldn't ensure it via is_not_null above.
2347  */
2348  if (constraint->contype == CONSTR_PRIMARY && !forced_not_null)
2349  {
2350  AlterTableCmd *notnullcmd = makeNode(AlterTableCmd);
2351 
2352  notnullcmd->subtype = AT_SetNotNull;
2353  notnullcmd->name = pstrdup(key);
2354  notnullcmds = lappend(notnullcmds, notnullcmd);
2355  }
2356  }
2357  }
2358 
2359  /*
2360  * Add included columns to index definition. This is much like the
2361  * simple-column-name-list code above, except that we don't worry about
2362  * NOT NULL marking; included columns in a primary key should not be
2363  * forced NOT NULL. We don't complain about duplicate columns, either,
2364  * though maybe we should?
2365  */
2366  foreach(lc, constraint->including)
2367  {
2368  char *key = strVal(lfirst(lc));
2369  bool found = false;
2370  ColumnDef *column = NULL;
2371  ListCell *columns;
2372  IndexElem *iparam;
2373 
2374  foreach(columns, cxt->columns)
2375  {
2376  column = lfirst_node(ColumnDef, columns);
2377  if (strcmp(column->colname, key) == 0)
2378  {
2379  found = true;
2380  break;
2381  }
2382  }
2383 
2384  if (!found)
2385  {
2386  if (SystemAttributeByName(key) != NULL)
2387  {
2388  /*
2389  * column will be a system column in the new table, so accept
2390  * it.
2391  */
2392  found = true;
2393  }
2394  else if (cxt->inhRelations)
2395  {
2396  /* try inherited tables */
2397  ListCell *inher;
2398 
2399  foreach(inher, cxt->inhRelations)
2400  {
2401  RangeVar *inh = lfirst_node(RangeVar, inher);
2402  Relation rel;
2403  int count;
2404 
2405  rel = table_openrv(inh, AccessShareLock);
2406  /* check user requested inheritance from valid relkind */
2407  if (rel->rd_rel->relkind != RELKIND_RELATION &&
2408  rel->rd_rel->relkind != RELKIND_FOREIGN_TABLE &&
2409  rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
2410  ereport(ERROR,
2411  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2412  errmsg("inherited relation \"%s\" is not a table or foreign table",
2413  inh->relname)));
2414  for (count = 0; count < rel->rd_att->natts; count++)
2415  {
2416  Form_pg_attribute inhattr = TupleDescAttr(rel->rd_att,
2417  count);
2418  char *inhname = NameStr(inhattr->attname);
2419 
2420  if (inhattr->attisdropped)
2421  continue;
2422  if (strcmp(key, inhname) == 0)
2423  {
2424  found = true;
2425  break;
2426  }
2427  }
2428  table_close(rel, NoLock);
2429  if (found)
2430  break;
2431  }
2432  }
2433  }
2434 
2435  /*
2436  * In the ALTER TABLE case, don't complain about index keys not
2437  * created in the command; they may well exist already. DefineIndex
2438  * will complain about them if not.
2439  */
2440  if (!found && !cxt->isalter)
2441  ereport(ERROR,
2442  (errcode(ERRCODE_UNDEFINED_COLUMN),
2443  errmsg("column \"%s\" named in key does not exist", key),
2444  parser_errposition(cxt->pstate, constraint->location)));
2445 
2446  /* OK, add it to the index definition */
2447  iparam = makeNode(IndexElem);
2448  iparam->name = pstrdup(key);
2449  iparam->expr = NULL;
2450  iparam->indexcolname = NULL;
2451  iparam->collation = NIL;
2452  iparam->opclass = NIL;
2453  index->indexIncludingParams = lappend(index->indexIncludingParams, iparam);
2454  }
2455 
2456  /*
2457  * If we found anything that requires run-time SET NOT NULL, build a full
2458  * ALTER TABLE command for that and add it to cxt->alist.
2459  */
2460  if (notnullcmds)
2461  {
2462  AlterTableStmt *alterstmt = makeNode(AlterTableStmt);
2463 
2464  alterstmt->relation = copyObject(cxt->relation);
2465  alterstmt->cmds = notnullcmds;
2466  alterstmt->relkind = OBJECT_TABLE;
2467  alterstmt->missing_ok = false;
2468 
2469  cxt->alist = lappend(cxt->alist, alterstmt);
2470  }
2471 
2472  return index;
2473 }
2474 
2475 /*
2476  * transformExtendedStatistics
2477  * Handle extended statistic objects
2478  *
2479  * Right now, there's nothing to do here, so we just append the list to
2480  * the existing "after" list.
2481  */
2482 static void
2483 transformExtendedStatistics(CreateStmtContext *cxt)
2484 {
2485  cxt->alist = list_concat(cxt->alist, cxt->extstats);
2486 }
2487 
2488 /*
2489  * transformCheckConstraints
2490  * handle CHECK constraints
2491  *
2492  * Right now, there's nothing to do here when called from ALTER TABLE,
2493  * but the other constraint-transformation functions are called in both
2494  * the CREATE TABLE and ALTER TABLE paths, so do the same here, and just
2495  * don't do anything if we're not authorized to skip validation.
2496  */
2497 static void
2498 transformCheckConstraints(CreateStmtContext *cxt, bool skipValidation)
2499 {
2500  ListCell *ckclist;
2501 
2502  if (cxt->ckconstraints == NIL)
2503  return;
2504 
2505  /*
2506  * If creating a new table (but not a foreign table), we can safely skip
2507  * validation of check constraints, and nonetheless mark them valid. (This
2508  * will override any user-supplied NOT VALID flag.)
2509  */
2510  if (skipValidation)
2511  {
2512  foreach(ckclist, cxt->ckconstraints)
2513  {
2514  Constraint *constraint = (Constraint *) lfirst(ckclist);
2515 
2516  constraint->skip_validation = true;
2517  constraint->initially_valid = true;
2518  }
2519  }
2520 }
2521 
2522 /*
2523  * transformFKConstraints
2524  * handle FOREIGN KEY constraints
2525  */
2526 static void
2527 transformFKConstraints(CreateStmtContext *cxt,
2528  bool skipValidation, bool isAddConstraint)
2529 {
2530  ListCell *fkclist;
2531 
2532  if (cxt->fkconstraints == NIL)
2533  return;
2534 
2535  /*
2536  * If CREATE TABLE or adding a column with NULL default, we can safely
2537  * skip validation of FK constraints, and nonetheless mark them valid.
2538  * (This will override any user-supplied NOT VALID flag.)
2539  */
2540  if (skipValidation)
2541  {
2542  foreach(fkclist, cxt->fkconstraints)
2543  {
2544  Constraint *constraint = (Constraint *) lfirst(fkclist);
2545 
2546  constraint->skip_validation = true;
2547  constraint->initially_valid = true;
2548  }
2549  }
2550 
2551  /*
2552  * For CREATE TABLE or ALTER TABLE ADD COLUMN, gin up an ALTER TABLE ADD
2553  * CONSTRAINT command to execute after the basic command is complete. (If
2554  * called from ADD CONSTRAINT, that routine will add the FK constraints to
2555  * its own subcommand list.)
2556  *
2557  * Note: the ADD CONSTRAINT command must also execute after any index
2558  * creation commands. Thus, this should run after
2559  * transformIndexConstraints, so that the CREATE INDEX commands are
2560  * already in cxt->alist.
2561  */
2562  if (!isAddConstraint)
2563  {
2564  AlterTableStmt *alterstmt = makeNode(AlterTableStmt);
2565 
2566  alterstmt->relation = cxt->relation;
2567  alterstmt->cmds = NIL;
2568  alterstmt->relkind = OBJECT_TABLE;
2569 
2570  foreach(fkclist, cxt->fkconstraints)
2571  {
2572  Constraint *constraint = (Constraint *) lfirst(fkclist);
2573  AlterTableCmd *altercmd = makeNode(AlterTableCmd);
2574 
2575  altercmd->subtype = AT_ProcessedConstraint;
2576  altercmd->name = NULL;
2577  altercmd->def = (Node *) constraint;
2578  alterstmt->cmds = lappend(alterstmt->cmds, altercmd);
2579  }
2580 
2581  cxt->alist = lappend(cxt->alist, alterstmt);
2582  }
2583 }
2584 
2585 /*
2586  * transformIndexStmt - parse analysis for CREATE INDEX and ALTER TABLE
2587  *
2588  * Note: this is a no-op for an index not using either index expressions or
2589  * a predicate expression. There are several code paths that create indexes
2590  * without bothering to call this, because they know they don't have any
2591  * such expressions to deal with.
2592  *
2593  * To avoid race conditions, it's important that this function rely only on
2594  * the passed-in relid (and not on stmt->relation) to determine the target
2595  * relation.
2596  */
2597 IndexStmt *
2598 transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
2599 {
2600  ParseState *pstate;
2601  RangeTblEntry *rte;
2602  ListCell *l;
2603  Relation rel;
2604 
2605  /* Nothing to do if statement already transformed. */
2606  if (stmt->transformed)
2607  return stmt;
2608 
2609  /*
2610  * We must not scribble on the passed-in IndexStmt, so copy it. (This is
2611  * overkill, but easy.)
2612  */
2613  stmt = copyObject(stmt);
2614 
2615  /* Set up pstate */
2616  pstate = make_parsestate(NULL);
2617  pstate->p_sourcetext = queryString;
2618 
2619  /*
2620  * Put the parent table into the rtable so that the expressions can refer
2621  * to its fields without qualification. Caller is responsible for locking
2622  * relation, but we still need to open it.
2623  */
2624  rel = relation_open(relid, NoLock);
2625  rte = addRangeTableEntryForRelation(pstate, rel,
2626  AccessShareLock,
2627  NULL, false, true);
2628 
2629  /* no to join list, yes to namespaces */
2630  addRTEtoQuery(pstate, rte, false, true, true);
2631 
2632  /* take care of the where clause */
2633  if (stmt->whereClause)
2634  {
2635  stmt->whereClause = transformWhereClause(pstate,
2636  stmt->whereClause,
2637  EXPR_KIND_INDEX_PREDICATE,
2638  "WHERE");
2639  /* we have to fix its collations too */
2640  assign_expr_collations(pstate, stmt->whereClause);
2641  }
2642 
2643  /* take care of any index expressions */
2644  foreach(l, stmt->indexParams)
2645  {
2646  IndexElem *ielem = (IndexElem *) lfirst(l);
2647 
2648  if (ielem->expr)
2649  {
2650  /* Extract preliminary index col name before transforming expr */
2651  if (ielem->indexcolname == NULL)
2652  ielem->indexcolname = FigureIndexColname(ielem->expr);
2653 
2654  /* Now do parse transformation of the expression */
2655  ielem->expr = transformExpr(pstate, ielem->expr,
2656  EXPR_KIND_INDEX_EXPRESSION);
2657 
2658  /* We have to fix its collations too */
2659  assign_expr_collations(pstate, ielem->expr);
2660 
2661  /*
2662  * transformExpr() should have already rejected subqueries,
2663  * aggregates, window functions, and SRFs, based on the EXPR_KIND_
2664  * for an index expression.
2665  *
2666  * DefineIndex() will make more checks.
2667  */
2668  }
2669  }
2670 
2671  /*
2672  * Check that only the base rel is mentioned. (This should be dead code
2673  * now that add_missing_from is history.)
2674  */
2675  if (list_length(pstate->p_rtable) != 1)
2676  ereport(ERROR,
2677  (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
2678  errmsg("index expressions and predicates can refer only to the table being indexed")));
2679 
2680  free_parsestate(pstate);
2681 
2682  /* Close relation */
2683  table_close(rel, NoLock);
2684 
2685  /* Mark statement as successfully transformed */
2686  stmt->transformed = true;
2687 
2688  return stmt;
2689 }
2690 
2691 
2692 /*
2693  * transformRuleStmt -
2694  * transform a CREATE RULE Statement. The action is a list of parse
2695  * trees which is transformed into a list of query trees, and we also
2696  * transform the WHERE clause if any.
2697  *
2698  * actions and whereClause are output parameters that receive the
2699  * transformed results.
2700  *
2701  * Note that we must not scribble on the passed-in RuleStmt, so we do
2702  * copyObject() on the actions and WHERE clause.
2703  */
2704 void
2705 transformRuleStmt(RuleStmt *stmt, const char *queryString,
2706  List **actions, Node **whereClause)
2707 {
2708  Relation rel;
2709  ParseState *pstate;
2710  RangeTblEntry *oldrte;
2711  RangeTblEntry *newrte;
2712 
2713  /*
2714  * To avoid deadlock, make sure the first thing we do is grab
2715  * AccessExclusiveLock on the target relation. This will be needed by
2716  * DefineQueryRewrite(), and we don't want to grab a lesser lock
2717  * beforehand.
2718  */
2719  rel = table_openrv(stmt->relation, AccessExclusiveLock);
2720 
2721  if (rel->rd_rel->relkind == RELKIND_MATVIEW)
2722  ereport(ERROR,
2723  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2724  errmsg("rules on materialized views are not supported")));
2725 
2726  /* Set up pstate */
2727  pstate = make_parsestate(NULL);
2728  pstate->p_sourcetext = queryString;
2729 
2730  /*
2731  * NOTE: 'OLD' must always have a varno equal to 1 and 'NEW' equal to 2.
2732  * Set up their RTEs in the main pstate for use in parsing the rule
2733  * qualification.
2734  */
2735  oldrte = addRangeTableEntryForRelation(pstate, rel,
2736  AccessShareLock,
2737  makeAlias("old", NIL),
2738  false, false);
2739  newrte = addRangeTableEntryForRelation(pstate, rel,
2740  AccessShareLock,
2741  makeAlias("new", NIL),
2742  false, false);
2743  /* Must override addRangeTableEntry's default access-check flags */
2744  oldrte->requiredPerms = 0;
2745  newrte->requiredPerms = 0;
2746 
2747  /*
2748  * They must be in the namespace too for lookup purposes, but only add the
2749  * one(s) that are relevant for the current kind of rule. In an UPDATE
2750  * rule, quals must refer to OLD.field or NEW.field to be unambiguous, but
2751  * there's no need to be so picky for INSERT & DELETE. We do not add them
2752  * to the joinlist.
2753  */
2754  switch (stmt->event)
2755  {
2756  case CMD_SELECT:
2757  addRTEtoQuery(pstate, oldrte, false, true, true);
2758  break;
2759  case CMD_UPDATE:
2760  addRTEtoQuery(pstate, oldrte, false, true, true);
2761  addRTEtoQuery(pstate, newrte, false, true, true);
2762  break;
2763  case CMD_INSERT:
2764  addRTEtoQuery(pstate, newrte, false, true, true);
2765  break;
2766  case CMD_DELETE:
2767  addRTEtoQuery(pstate, oldrte, false, true, true);
2768  break;
2769  default:
2770  elog(ERROR, "unrecognized event type: %d",
2771  (int) stmt->event);
2772  break;
2773  }
2774 
2775  /* take care of the where clause */
2776  *whereClause = transformWhereClause(pstate,
2777  (Node *) copyObject(stmt->whereClause),
2778  EXPR_KIND_WHERE,
2779  "WHERE");
2780  /* we have to fix its collations too */
2781  assign_expr_collations(pstate, *whereClause);
2782 
2783  /* this is probably dead code without add_missing_from: */
2784  if (list_length(pstate->p_rtable) != 2) /* naughty, naughty... */
2785  ereport(ERROR,
2786  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
2787  errmsg("rule WHERE condition cannot contain references to other relations")));
2788 
2789  /*
2790  * 'instead nothing' rules with a qualification need a query rangetable so
2791  * the rewrite handler can add the negated rule qualification to the
2792  * original query. We create a query with the new command type CMD_NOTHING
2793  * here that is treated specially by the rewrite system.
2794  */
2795  if (stmt->actions == NIL)
2796  {
2797  Query *nothing_qry = makeNode(Query);
2798 
2799  nothing_qry->commandType = CMD_NOTHING;
2800  nothing_qry->rtable = pstate->p_rtable;
2801  nothing_qry->jointree = makeFromExpr(NIL, NULL); /* no join wanted */
2802 
2803  *actions = list_make1(nothing_qry);
2804  }
2805  else
2806  {
2807  ListCell *l;
2808  List *newactions = NIL;
2809 
2810  /*
2811  * transform each statement, like parse_sub_analyze()
2812  */
2813  foreach(l, stmt->actions)
2814  {
2815  Node *action = (Node *) lfirst(l);
2816  ParseState *sub_pstate = make_parsestate(NULL);
2817  Query *sub_qry,
2818  *top_subqry;
2819  bool has_old,
2820  has_new;
2821 
2822  /*
2823  * Since outer ParseState isn't parent of inner, have to pass down
2824  * the query text by hand.
2825  */
2826  sub_pstate->p_sourcetext = queryString;
2827 
2828  /*
2829  * Set up OLD/NEW in the rtable for this statement. The entries
2830  * are added only to relnamespace, not varnamespace, because we
2831  * don't want them to be referred to by unqualified field names
2832  * nor "*" in the rule actions. We decide later whether to put
2833  * them in the joinlist.
2834  */
2835  oldrte = addRangeTableEntryForRelation(sub_pstate, rel,
2836  AccessShareLock,
2837  makeAlias("old", NIL),
2838  false, false);
2839  newrte = addRangeTableEntryForRelation(sub_pstate, rel,
2840  AccessShareLock,
2841  makeAlias("new", NIL),
2842  false, false);
2843  oldrte->requiredPerms = 0;
2844  newrte->requiredPerms = 0;
2845  addRTEtoQuery(sub_pstate, oldrte, false, true, false);
2846  addRTEtoQuery(sub_pstate, newrte, false, true, false);
2847 
2848  /* Transform the rule action statement */
2849  top_subqry = transformStmt(sub_pstate,
2850  (Node *) copyObject(action));
2851 
2852  /*
2853  * We cannot support utility-statement actions (eg NOTIFY) with
2854  * nonempty rule WHERE conditions, because there's no way to make
2855  * the utility action execute conditionally.
2856  */
2857  if (top_subqry->commandType == CMD_UTILITY &&
2858  *whereClause != NULL)
2859  ereport(ERROR,
2860  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
2861  errmsg("rules with WHERE conditions can only have SELECT, INSERT, UPDATE, or DELETE actions")));
2862 
2863  /*
2864  * If the action is INSERT...SELECT, OLD/NEW have been pushed down
2865  * into the SELECT, and that's what we need to look at. (Ugly
2866  * kluge ... try to fix this when we redesign querytrees.)
2867  */
2868  sub_qry = getInsertSelectQuery(top_subqry, NULL);
2869 
2870  /*
2871  * If the sub_qry is a setop, we cannot attach any qualifications
2872  * to it, because the planner won't notice them. This could
2873  * perhaps be relaxed someday, but for now, we may as well reject
2874  * such a rule immediately.
2875  */
2876  if (sub_qry->setOperations != NULL && *whereClause != NULL)
2877  ereport(ERROR,
2878  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2879  errmsg("conditional UNION/INTERSECT/EXCEPT statements are not implemented")));
2880 
2881  /*
2882  * Validate action's use of OLD/NEW, qual too
2883  */
2884  has_old =
2885  rangeTableEntry_used((Node *) sub_qry, PRS2_OLD_VARNO, 0) ||
2886  rangeTableEntry_used(*whereClause, PRS2_OLD_VARNO, 0);
2887  has_new =
2888  rangeTableEntry_used((Node *) sub_qry, PRS2_NEW_VARNO, 0) ||
2889  rangeTableEntry_used(*whereClause, PRS2_NEW_VARNO, 0);
2890 
2891  switch (stmt->event)
2892  {
2893  case CMD_SELECT:
2894  if (has_old)
2895  ereport(ERROR,
2896  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
2897  errmsg("ON SELECT rule cannot use OLD")));
2898  if (has_new)
2899  ereport(ERROR,
2900  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
2901  errmsg("ON SELECT rule cannot use NEW")));
2902  break;
2903  case CMD_UPDATE:
2904  /* both are OK */
2905  break;
2906  case CMD_INSERT:
2907  if (has_old)
2908  ereport(ERROR,
2909  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
2910  errmsg("ON INSERT rule cannot use OLD")));
2911  break;
2912  case CMD_DELETE:
2913  if (has_new)
2914  ereport(ERROR,
2915  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
2916  errmsg("ON DELETE rule cannot use NEW")));
2917  break;
2918  default:
2919  elog(ERROR, "unrecognized event type: %d",
2920  (int) stmt->event);
2921  break;
2922  }
2923 
2924  /*
2925  * OLD/NEW are not allowed in WITH queries, because they would
2926  * amount to outer references for the WITH, which we disallow.
2927  * However, they were already in the outer rangetable when we
2928  * analyzed the query, so we have to check.
2929  *
2930  * Note that in the INSERT...SELECT case, we need to examine the
2931  * CTE lists of both top_subqry and sub_qry.
2932  *
2933  * Note that we aren't digging into the body of the query looking
2934  * for WITHs in nested sub-SELECTs. A WITH down there can
2935  * legitimately refer to OLD/NEW, because it'd be an
2936  * indirect-correlated outer reference.
2937  */
2938  if (rangeTableEntry_used((Node *) top_subqry->cteList,
2939  PRS2_OLD_VARNO, 0) ||
2940  rangeTableEntry_used((Node *) sub_qry->cteList,
2941  PRS2_OLD_VARNO, 0))
2942  ereport(ERROR,
2943  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2944  errmsg("cannot refer to OLD within WITH query")));
2945  if (rangeTableEntry_used((Node *) top_subqry->cteList,
2946  PRS2_NEW_VARNO, 0) ||
2947  rangeTableEntry_used((Node *) sub_qry->cteList,
2948  PRS2_NEW_VARNO, 0))
2949  ereport(ERROR,
2950  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2951  errmsg("cannot refer to NEW within WITH query")));
2952 
2953  /*
2954  * For efficiency's sake, add OLD to the rule action's jointree
2955  * only if it was actually referenced in the statement or qual.
2956  *
2957  * For INSERT, NEW is not really a relation (only a reference to
2958  * the to-be-inserted tuple) and should never be added to the
2959  * jointree.
2960  *
2961  * For UPDATE, we treat NEW as being another kind of reference to
2962  * OLD, because it represents references to *transformed* tuples
2963  * of the existing relation. It would be wrong to enter NEW
2964  * separately in the jointree, since that would cause a double
2965  * join of the updated relation. It's also wrong to fail to make
2966  * a jointree entry if only NEW and not OLD is mentioned.
2967  */
2968  if (has_old || (has_new && stmt->event == CMD_UPDATE))
2969  {
2970  /*
2971  * If sub_qry is a setop, manipulating its jointree will do no
2972  * good at all, because the jointree is dummy. (This should be
2973  * a can't-happen case because of prior tests.)
2974  */
2975  if (sub_qry->setOperations != NULL)
2976  ereport(ERROR,
2977  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2978  errmsg("conditional UNION/INTERSECT/EXCEPT statements are not implemented")));
2979  /* hack so we can use addRTEtoQuery() */
2980  sub_pstate->p_rtable = sub_qry->rtable;
2981  sub_pstate->p_joinlist = sub_qry->jointree->fromlist;
2982  addRTEtoQuery(sub_pstate, oldrte, true, false, false);
2983  sub_qry->jointree->fromlist = sub_pstate->p_joinlist;
2984  }
2985 
2986  newactions = lappend(newactions, top_subqry);
2987 
2988  free_parsestate(sub_pstate);
2989  }
2990 
2991  *actions = newactions;
2992  }
2993 
2994  free_parsestate(pstate);
2995 
2996  /* Close relation, but keep the exclusive lock */
2997  table_close(rel, NoLock);
2998 }
2999 
3000 
3001 /*
3002  * transformAlterTableStmt -
3003  * parse analysis for ALTER TABLE
3004  *
3005  * Returns a List of utility commands to be done in sequence. One of these
3006  * will be the transformed AlterTableStmt, but there may be additional actions
3007  * to be done before and after the actual AlterTable() call.
3008  *
3009  * To avoid race conditions, it's important that this function rely only on
3010  * the passed-in relid (and not on stmt->relation) to determine the target
3011  * relation.
3012  */
3013 List *
3014 transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
3015  const char *queryString)
3016 {
3017  Relation rel;
3018  TupleDesc tupdesc;
3019  ParseState *pstate;
3020  CreateStmtContext cxt;
3021  List *result;
3022  List *save_alist;
3023  ListCell *lcmd,
3024  *l;
3025  List *newcmds = NIL;
3026  bool skipValidation = true;
3027  AlterTableCmd *newcmd;
3028  RangeTblEntry *rte;
3029 
3030  /*
3031  * We must not scribble on the passed-in AlterTableStmt, so copy it. (This
3032  * is overkill, but easy.)
3033  */
3034  stmt = copyObject(stmt);
3035 
3036  /* Caller is responsible for locking the relation */
3037  rel = relation_open(relid, NoLock);
3038  tupdesc = RelationGetDescr(rel);
3039 
3040  /* Set up pstate */
3041  pstate = make_parsestate(NULL);
3042  pstate->p_sourcetext = queryString;
3043  rte = addRangeTableEntryForRelation(pstate,
3044  rel,
3045  AccessShareLock,
3046  NULL,
3047  false,
3048  true);
3049  addRTEtoQuery(pstate, rte, false, true, true);
3050 
3051  /* Set up CreateStmtContext */
3052  cxt.pstate = pstate;
3053  if (stmt->relkind == OBJECT_FOREIGN_TABLE)
3054  {
3055  cxt.stmtType = "ALTER FOREIGN TABLE";
3056  cxt.isforeign = true;
3057  }
3058  else
3059  {
3060  cxt.stmtType = "ALTER TABLE";
3061  cxt.isforeign = false;
3062  }
3063  cxt.relation = stmt->relation;
3064  cxt.rel = rel;
3065  cxt.inhRelations = NIL;
3066  cxt.isalter = true;
3067  cxt.columns = NIL;
3068  cxt.ckconstraints = NIL;
3069  cxt.fkconstraints = NIL;
3070  cxt.ixconstraints = NIL;
3071  cxt.inh_indexes = NIL;
3072  cxt.extstats = NIL;
3073  cxt.blist = NIL;
3074  cxt.alist = NIL;
3075  cxt.pkey = NULL;
3076  cxt.ispartitioned = (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
3077  cxt.partbound = NULL;
3078  cxt.ofType = false;
3079 
3080  /*
3081  * The only subtypes that currently require parse transformation handling
3082  * are ADD COLUMN, ADD CONSTRAINT and SET DATA TYPE. These largely re-use
3083  * code from CREATE TABLE.
3084  */
3085  foreach(lcmd, stmt->cmds)
3086  {
3087  AlterTableCmd *cmd = (AlterTableCmd *) lfirst(lcmd);
3088 
3089  switch (cmd->subtype)
3090  {
3091  case AT_AddColumn:
3092  case AT_AddColumnToView:
3093  {
3094  ColumnDef *def = castNode(ColumnDef, cmd->def);
3095 
3096  transformColumnDefinition(&cxt, def);
3097 
3098  /*
3099  * If the column has a non-null default, we can't skip
3100  * validation of foreign keys.
3101  */
3102  if (def->raw_default != NULL)
3103  skipValidation = false;
3104 
3105  /*
3106  * All constraints are processed in other ways. Remove the
3107  * original list
3108  */
3109  def->constraints = NIL;
3110 
3111  newcmds = lappend(newcmds, cmd);
3112  break;
3113  }
3114 
3115  case AT_AddConstraint:
3116 
3117  /*
3118  * The original AddConstraint cmd node doesn't go to newcmds
3119  */
3120  if (IsA(cmd->def, Constraint))
3121  {
3122  transformTableConstraint(&cxt, (Constraint *) cmd->def);
3123  if (((Constraint *) cmd->def)->contype == CONSTR_FOREIGN)
3124  skipValidation = false;
3125  }
3126  else
3127  elog(ERROR, "unrecognized node type: %d",
3128  (int) nodeTag(cmd->def));
3129  break;
3130 
3131  case AT_ProcessedConstraint:
3132 
3133  /*
3134  * Already-transformed ADD CONSTRAINT, so just make it look
3135  * like the standard case.
3136  */
3137  cmd->subtype = AT_AddConstraint;
3138  newcmds = lappend(newcmds, cmd);
3139  break;
3140 
3141  case AT_AlterColumnType:
3142  {
3143  ColumnDef *def = (ColumnDef *) cmd->def;
3144  AttrNumber attnum;
3145 
3146  /*
3147  * For ALTER COLUMN TYPE, transform the USING clause if
3148  * one was specified.
3149  */
3150  if (def->raw_default)
3151  {
3152  def->cooked_default =
3153  transformExpr(pstate, def->raw_default,
3154  EXPR_KIND_ALTER_COL_TRANSFORM);
3155  }
3156 
3157  /*
3158  * For identity column, create ALTER SEQUENCE command to
3159  * change the data type of the sequence.
3160  */
3161  attnum = get_attnum(relid, cmd->name);
3162 
3163  /*
3164  * if attribute not found, something will error about it
3165  * later
3166  */
3167  if (attnum != InvalidAttrNumber &&
3168  TupleDescAttr(tupdesc, attnum - 1)->attidentity)
3169  {
3170  Oid seq_relid = getIdentitySequence(relid, attnum, false);
3171  Oid typeOid = typenameTypeId(pstate, def->typeName);
3172  AlterSeqStmt *altseqstmt = makeNode(AlterSeqStmt);
3173 
3174  altseqstmt->sequence = makeRangeVar(get_namespace_name(get_rel_namespace(seq_relid)),
3175  get_rel_name(seq_relid),
3176  -1);
3177  altseqstmt->options = list_make1(makeDefElem("as", (Node *) makeTypeNameFromOid(typeOid, -1), -1));
3178  altseqstmt->for_identity = true;
3179  cxt.blist = lappend(cxt.blist, altseqstmt);
3180  }
3181 
3182  newcmds = lappend(newcmds, cmd);
3183  break;
3184  }
3185 
3186  case AT_AddIdentity:
3187  {
3188  Constraint *def = castNode(Constraint, cmd->def);
3189  ColumnDef *newdef = makeNode(ColumnDef);
3190  AttrNumber attnum;
3191 
3192  newdef->colname = cmd->name;
3193  newdef->identity = def->generated_when;
3194  cmd->def = (Node *) newdef;
3195 
3196  attnum = get_attnum(relid, cmd->name);
3197 
3198  /*
3199  * if attribute not found, something will error about it
3200  * later
3201  */
3202  if (attnum != InvalidAttrNumber)
3203  generateSerialExtraStmts(&cxt, newdef,
3204  get_atttype(relid, attnum),
3205  def->options, true,
3206  NULL, NULL);
3207 
3208  newcmds = lappend(newcmds, cmd);
3209  break;
3210  }
3211 
3212  case AT_SetIdentity:
3213  {
3214  /*
3215  * Create an ALTER SEQUENCE statement for the internal
3216  * sequence of the identity column.
3217  */
3218  ListCell *lc;
3219  List *newseqopts = NIL;
3220  List *newdef = NIL;
3221  AttrNumber attnum;
3222 
3223  /*
3224  * Split options into those handled by ALTER SEQUENCE and
3225  * those for ALTER TABLE proper.
3226  */
3227  foreach(lc, castNode(List, cmd->def))
3228  {
3229  DefElem *def = lfirst_node(DefElem, lc);
3230 
3231  if (strcmp(def->defname, "generated") == 0)
3232  newdef = lappend(newdef, def);
3233  else
3234  newseqopts = lappend(newseqopts, def);
3235  }
3236 
3237  attnum = get_attnum(relid, cmd->name);
3238 
3239  if (attnum)
3240  {
3241  Oid seq_relid = getIdentitySequence(relid, attnum, true);
3242 
3243  if (seq_relid)
3244  {
3245  AlterSeqStmt *seqstmt;
3246 
3247  seqstmt = makeNode(AlterSeqStmt);
3248  seqstmt->sequence = makeRangeVar(get_namespace_name(get_rel_namespace(seq_relid)),
3249  get_rel_name(seq_relid), -1);
3250  seqstmt->options = newseqopts;
3251  seqstmt->for_identity = true;
3252  seqstmt->missing_ok = false;
3253 
3254  cxt.alist = lappend(cxt.alist, seqstmt);
3255  }
3256  }
3257 
3258  /*
3259  * If column was not found or was not an identity column,
3260  * we just let the ALTER TABLE command error out later.
3261  */
3262 
3263  cmd->def = (Node *) newdef;
3264  newcmds = lappend(newcmds, cmd);
3265  break;
3266  }
3267 
3268  case AT_AttachPartition:
3269  case AT_DetachPartition:
3270  {
3271  PartitionCmd *partcmd = (PartitionCmd *) cmd->def;
3272 
3273  transformPartitionCmd(&cxt, partcmd);
3274  /* assign transformed value of the partition bound */
3275  partcmd->bound = cxt.partbound;
3276  }
3277 
3278  newcmds = lappend(newcmds, cmd);
3279  break;
3280 
3281  default:
3282  newcmds = lappend(newcmds, cmd);
3283  break;
3284  }
3285  }
3286 
3287  /*
3288  * Transfer anything we already have in cxt.alist into save_alist, to keep
3289  * it separate from the output of transformIndexConstraints.
3290  */
3291  save_alist = cxt.alist;
3292  cxt.alist = NIL;
3293 
3294  /* Postprocess constraints */
3295  transformIndexConstraints(&cxt);
3296  transformFKConstraints(&cxt, skipValidation, true);
3297  transformCheckConstraints(&cxt, false);
3298 
3299  /*
3300  * Push any index-creation commands into the ALTER, so that they can be
3301  * scheduled nicely by tablecmds.c. Note that tablecmds.c assumes that
3302  * the IndexStmt attached to an AT_AddIndex or AT_AddIndexConstraint
3303  * subcommand has already been through transformIndexStmt.
3304  */
3305  foreach(l, cxt.alist)
3306  {
3307  Node *istmt = (Node *) lfirst(l);
3308 
3309  /*
3310  * We assume here that cxt.alist contains only IndexStmts and possibly
3311  * ALTER TABLE SET NOT NULL statements generated from primary key
3312  * constraints. We absorb the subcommands of the latter directly.
3313  */
3314  if (IsA(istmt, IndexStmt))
3315  {
3316  IndexStmt *idxstmt = (IndexStmt *) istmt;
3317 
3318  idxstmt = transformIndexStmt(relid, idxstmt, queryString);
3319  newcmd = makeNode(AlterTableCmd);
3320  newcmd->subtype = OidIsValid(idxstmt->indexOid) ? AT_AddIndexConstraint : AT_AddIndex;
3321  newcmd->def = (Node *) idxstmt;
3322  newcmds = lappend(newcmds, newcmd);
3323  }
3324  else if (IsA(istmt, AlterTableStmt))
3325  {
3326  AlterTableStmt *alterstmt = (AlterTableStmt *) istmt;
3327 
3328  newcmds = list_concat(newcmds, alterstmt->cmds);
3329  }
3330  else
3331  elog(ERROR, "unexpected stmt type %d", (int) nodeTag(istmt));
3332  }
3333  cxt.alist = NIL;
3334 
3335  /* Append any CHECK or FK constraints to the commands list */
3336  foreach(l, cxt.ckconstraints)
3337  {
3338  newcmd = makeNode(AlterTableCmd);
3339  newcmd->subtype = AT_AddConstraint;
3340  newcmd->def = (Node *) lfirst(l);
3341  newcmds = lappend(newcmds, newcmd);
3342  }
3343  foreach(l, cxt.fkconstraints)
3344  {
3345  newcmd = makeNode(AlterTableCmd);
3346  newcmd->subtype = AT_AddConstraint;
3347  newcmd->def = (Node *) lfirst(l);
3348  newcmds = lappend(newcmds, newcmd);
3349  }
3350 
3351  /* Append extended statistic objects */
3352  transformExtendedStatistics(&cxt);
3353 
3354  /* Close rel */
3355  relation_close(rel, NoLock);
3356 
3357  /*
3358  * Output results.
3359  */
3360  stmt->cmds = newcmds;
3361 
3362  result = lappend(cxt.blist, stmt);
3363  result = list_concat(result, cxt.alist);
3364  result = list_concat(result, save_alist);
3365 
3366  return result;
3367 }
3368 
3369 
3370 /*
3371  * Preprocess a list of column constraint clauses
3372  * to attach constraint attributes to their primary constraint nodes
3373  * and detect inconsistent/misplaced constraint attributes.
3374  *
3375  * NOTE: currently, attributes are only supported for FOREIGN KEY, UNIQUE,
3376  * EXCLUSION, and PRIMARY KEY constraints, but someday they ought to be
3377  * supported for other constraint types.
3378  */
3379 static void
3380 transformConstraintAttrs(CreateStmtContext *cxt, List *constraintList)
3381 {
3382  Constraint *lastprimarycon = NULL;
3383  bool saw_deferrability = false;
3384  bool saw_initially = false;
3385  ListCell *clist;
3386 
3387 #define SUPPORTS_ATTRS(node) \
3388  ((node) != NULL && \
3389  ((node)->contype == CONSTR_PRIMARY || \
3390  (node)->contype == CONSTR_UNIQUE || \
3391  (node)->contype == CONSTR_EXCLUSION || \
3392  (node)->contype == CONSTR_FOREIGN))
3393 
3394  foreach(clist, constraintList)
3395  {
3396  Constraint *con = (Constraint *) lfirst(clist);
3397 
3398  if (!IsA(con, Constraint))
3399  elog(ERROR, "unrecognized node type: %d",
3400  (int) nodeTag(con));
3401  switch (con->contype)
3402  {
3403  case CONSTR_ATTR_DEFERRABLE:
3404  if (!SUPPORTS_ATTRS(lastprimarycon))
3405  ereport(ERROR,
3406  (errcode(ERRCODE_SYNTAX_ERROR),
3407  errmsg("misplaced DEFERRABLE clause"),
3408  parser_errposition(cxt->pstate, con->location)));
3409  if (saw_deferrability)
3410  ereport(ERROR,
3411  (errcode(ERRCODE_SYNTAX_ERROR),
3412  errmsg("multiple DEFERRABLE/NOT DEFERRABLE clauses not allowed"),
3413  parser_errposition(cxt->pstate, con->location)));
3414  saw_deferrability = true;
3415  lastprimarycon->deferrable = true;
3416  break;
3417 
3418  case CONSTR_ATTR_NOT_DEFERRABLE:
3419  if (!SUPPORTS_ATTRS(lastprimarycon))
3420  ereport(ERROR,
3421  (errcode(ERRCODE_SYNTAX_ERROR),
3422  errmsg("misplaced NOT DEFERRABLE clause"),
3423  parser_errposition(cxt->pstate, con->location)));
3424  if (saw_deferrability)
3425  ereport(ERROR,
3426  (errcode(ERRCODE_SYNTAX_ERROR),
3427  errmsg("multiple DEFERRABLE/NOT DEFERRABLE clauses not allowed"),
3428  parser_errposition(cxt->pstate, con->location)));
3429  saw_deferrability = true;
3430  lastprimarycon->deferrable = false;
3431  if (saw_initially &&
3432  lastprimarycon->initdeferred)
3433  ereport(ERROR,
3434  (errcode(ERRCODE_SYNTAX_ERROR),
3435  errmsg("constraint declared INITIALLY DEFERRED must be DEFERRABLE"),
3436  parser_errposition(cxt->pstate, con->location)));
3437  break;
3438 
3439  case CONSTR_ATTR_DEFERRED:
3440  if (!SUPPORTS_ATTRS(lastprimarycon))
3441  ereport(ERROR,
3442  (errcode(ERRCODE_SYNTAX_ERROR),
3443  errmsg("misplaced INITIALLY DEFERRED clause"),
3444  parser_errposition(cxt->pstate, con->location)));
3445  if (saw_initially)
3446  ereport(ERROR,
3447  (errcode(ERRCODE_SYNTAX_ERROR),
3448  errmsg("multiple INITIALLY IMMEDIATE/DEFERRED clauses not allowed"),
3449  parser_errposition(cxt->pstate, con->location)));
3450  saw_initially = true;
3451  lastprimarycon->initdeferred = true;
3452 
3453  /*
3454  * If only INITIALLY DEFERRED appears, assume DEFERRABLE
3455  */
3456  if (!saw_deferrability)
3457  lastprimarycon->deferrable = true;
3458  else if (!lastprimarycon->deferrable)
3459  ereport(ERROR,
3460  (errcode(ERRCODE_SYNTAX_ERROR),
3461  errmsg("constraint declared INITIALLY DEFERRED must be DEFERRABLE"),
3462  parser_errposition(cxt->pstate, con->location)));
3463  break;
3464 
3465  case CONSTR_ATTR_IMMEDIATE:
3466  if (!SUPPORTS_ATTRS(lastprimarycon))
3467  ereport(ERROR,
3468  (errcode(ERRCODE_SYNTAX_ERROR),
3469  errmsg("misplaced INITIALLY IMMEDIATE clause"),
3470  parser_errposition(cxt->pstate, con->location)));
3471  if (saw_initially)
3472  ereport(ERROR,
3473  (errcode(ERRCODE_SYNTAX_ERROR),
3474  errmsg("multiple INITIALLY IMMEDIATE/DEFERRED clauses not allowed"),
3475  parser_errposition(cxt->pstate, con->location)));
3476  saw_initially = true;
3477  lastprimarycon->initdeferred = false;
3478  break;
3479 
3480  default:
3481  /* Otherwise it's not an attribute */
3482  lastprimarycon = con;
3483  /* reset flags for new primary node */
3484  saw_deferrability = false;
3485  saw_initially = false;
3486  break;
3487  }
3488  }
3489 }
3490 
3491 /*
3492  * Special handling of type definition for a column
3493  */
3494 static void
3495 transformColumnType(CreateStmtContext *cxt, ColumnDef *column)
3496 {
3497  /*
3498  * All we really need to do here is verify that the type is valid,
3499  * including any collation spec that might be present.
3500  */
3501  Type ctype = typenameType(cxt->pstate, column->typeName, NULL);
3502 
3503  if (column->collClause)
3504  {
3505  Form_pg_type typtup = (Form_pg_type) GETSTRUCT(ctype);
3506 
3507  LookupCollation(cxt->pstate,
3508  column->collClause->collname,
3509  column->collClause->location);
3510  /* Complain if COLLATE is applied to an uncollatable type */
3511  if (!OidIsValid(typtup->typcollation))
3512  ereport(ERROR,
3513  (errcode(ERRCODE_DATATYPE_MISMATCH),
3514  errmsg("collations are not supported by type %s",
3515  format_type_be(typtup->oid)),
3516  parser_errposition(cxt->pstate,
3517  column->collClause->location)));
3518  }
3519 
3520  ReleaseSysCache(ctype);
3521 }
3522 
3523 
3524 /*
3525  * transformCreateSchemaStmt -
3526  * analyzes the CREATE SCHEMA statement
3527  *
3528  * Split the schema element list into individual commands and place
3529  * them in the result list in an order such that there are no forward
3530  * references (e.g. GRANT to a table created later in the list). Note
3531  * that the logic we use for determining forward references is
3532  * presently quite incomplete.
3533  *
3534  * SQL also allows constraints to make forward references, so thumb through
3535  * the table columns and move forward references to a posterior alter-table
3536  * command.
3537  *
3538  * The result is a list of parse nodes that still need to be analyzed ---
3539  * but we can't analyze the later commands until we've executed the earlier
3540  * ones, because of possible inter-object references.
3541  *
3542  * Note: this breaks the rules a little bit by modifying schema-name fields
3543  * within passed-in structs. However, the transformation would be the same
3544  * if done over, so it should be all right to scribble on the input to this
3545  * extent.
3546  */
3547 List *
3548 transformCreateSchemaStmt(CreateSchemaStmt *stmt)
3549 {
3550  CreateSchemaStmtContext cxt;
3551  List *result;
3552  ListCell *elements;
3553 
3554  cxt.stmtType = "CREATE SCHEMA";
3555  cxt.schemaname = stmt->schemaname;
3556  cxt.authrole = (RoleSpec *) stmt->authrole;
3557  cxt.sequences = NIL;
3558  cxt.tables = NIL;
3559  cxt.views = NIL;
3560  cxt.indexes = NIL;
3561  cxt.triggers = NIL;
3562  cxt.grants = NIL;
3563 
3564  /*
3565  * Run through each schema element in the schema element list. Separate
3566  * statements by type, and do preliminary analysis.
3567  */
3568  foreach(elements, stmt->schemaElts)
3569  {
3570  Node *element = lfirst(elements);
3571 
3572  switch (nodeTag(element))
3573  {
3574  case T_CreateSeqStmt:
3575  {
3576  CreateSeqStmt *elp = (CreateSeqStmt *) element;
3577 
3578  setSchemaName(cxt.schemaname, &elp->sequence->schemaname);
3579  cxt.sequences = lappend(cxt.sequences, element);
3580  }
3581  break;
3582 
3583  case T_CreateStmt:
3584  {
3585  CreateStmt *elp = (CreateStmt *) element;
3586 
3587  setSchemaName(cxt.schemaname, &elp->relation->schemaname);
3588 
3589  /*
3590  * XXX todo: deal with constraints
3591  */
3592  cxt.tables = lappend(cxt.tables, element);
3593  }
3594  break;
3595 
3596  case T_ViewStmt:
3597  {
3598  ViewStmt *elp = (ViewStmt *) element;
3599 
3600  setSchemaName(cxt.schemaname, &elp->view->schemaname);
3601 
3602  /*
3603  * XXX todo: deal with references between views
3604  */
3605  cxt.views = lappend(cxt.views, element);
3606  }
3607  break;
3608 
3609  case T_IndexStmt:
3610  {
3611  IndexStmt *elp = (IndexStmt *) element;
3612 
3613  setSchemaName(cxt.schemaname, &elp->relation->schemaname);
3614  cxt.indexes = lappend(cxt.indexes, element);
3615  }
3616  break;
3617 
3618  case T_CreateTrigStmt:
3619  {
3620  CreateTrigStmt *elp = (CreateTrigStmt *) element;
3621 
3622  setSchemaName(cxt.schemaname, &elp->relation->schemaname);
3623  cxt.triggers = lappend(cxt.triggers, element);
3624  }
3625  break;
3626 
3627  case T_GrantStmt:
3628  cxt.grants = lappend(cxt.grants, element);
3629  break;
3630 
3631  default:
3632  elog(ERROR, "unrecognized node type: %d",
3633  (int) nodeTag(element));
3634  }
3635  }
3636 
3637  result = NIL;
3638  result = list_concat(result, cxt.sequences);
3639  result = list_concat(result, cxt.tables);
3640  result = list_concat(result, cxt.views);
3641  result = list_concat(result, cxt.indexes);
3642  result = list_concat(result, cxt.triggers);
3643  result = list_concat(result, cxt.grants);
3644 
3645  return result;
3646 }
3647 
3648 /*
3649  * setSchemaName
3650  * Set or check schema name in an element of a CREATE SCHEMA command
3651  */
3652 static void
3653 setSchemaName(char *context_schema, char **stmt_schema_name)
3654 {
3655  if (*stmt_schema_name == NULL)
3656  *stmt_schema_name = context_schema;
3657  else if (strcmp(context_schema, *stmt_schema_name) != 0)
3658  ereport(ERROR,
3659  (errcode(ERRCODE_INVALID_SCHEMA_DEFINITION),
3660  errmsg("CREATE specifies a schema (%s) "
3661  "different from the one being created (%s)",
3662  *stmt_schema_name, context_schema)));
3663 }
3664 
3665 /*
3666  * transformPartitionCmd
3667  * Analyze the ATTACH/DETACH PARTITION command
3668  *
3669  * In case of the ATTACH PARTITION command, cxt->partbound is set to the
3670  * transformed value of cmd->bound.
3671  */
3672 static void
3673 transformPartitionCmd(CreateStmtContext *cxt, PartitionCmd *cmd)
3674 {
3675  Relation parentRel = cxt->rel;
3676 
3677  switch (parentRel->rd_rel->relkind)
3678  {
3679  case RELKIND_PARTITIONED_TABLE:
3680  /* transform the partition bound, if any */
3681  Assert(RelationGetPartitionKey(parentRel) != NULL);
3682  if (cmd->bound != NULL)
3683  cxt->partbound = transformPartitionBound(cxt->pstate, parentRel,
3684  cmd->bound);
3685  break;
3686  case RELKIND_PARTITIONED_INDEX:
3687  /* nothing to check */
3688  Assert(cmd->bound == NULL);
3689  break;
3690  case RELKIND_RELATION:
3691  /* the table must be partitioned */
3692  ereport(ERROR,
3693  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
3694  errmsg("table \"%s\" is not partitioned",
3695  RelationGetRelationName(parentRel))));
3696  break;
3697  case RELKIND_INDEX:
3698  /* the index must be partitioned */
3699  ereport(ERROR,
3700  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
3701  errmsg("index \"%s\" is not partitioned",
3702  RelationGetRelationName(parentRel))));
3703  break;
3704  default:
3705  /* parser shouldn't let this case through */
3706  elog(ERROR, "\"%s\" is not a partitioned table or index",
3707  RelationGetRelationName(parentRel));
3708  break;
3709  }
3710 }
3711 
3712 /*
3713  * transformPartitionBound
3714  *
3715  * Transform a partition bound specification
3716  */
3717 PartitionBoundSpec *
3718 transformPartitionBound(ParseState *pstate, Relation parent,
3719  PartitionBoundSpec *spec)
3720 {
3721  PartitionBoundSpec *result_spec;
3722  PartitionKey key = RelationGetPartitionKey(parent);
3723  char strategy = get_partition_strategy(key);
3724  int partnatts = get_partition_natts(key);
3725  List *partexprs = get_partition_exprs(key);
3726 
3727  /* Avoid scribbling on input */
3728  result_spec = copyObject(spec);
3729 
3730  if (spec->is_default)
3731  {
3732  /*
3733  * Hash partitioning does not support a default partition; there's no
3734  * use case for it (since the set of partitions to create is perfectly
3735  * defined), and if users do get into it accidentally, it's hard to
3736  * back out from it afterwards.
3737  */
3738  if (strategy == PARTITION_STRATEGY_HASH)
3739  ereport(ERROR,
3740  (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
3741  errmsg("a hash-partitioned table may not have a default partition")));
3742 
3743  /*
3744  * In case of the default partition, parser had no way to identify the
3745  * partition strategy. Assign the parent's strategy to the default
3746  * partition bound spec.
3747  */
3748  result_spec->strategy = strategy;
3749 
3750  return result_spec;
3751  }
3752 
3753  if (strategy == PARTITION_STRATEGY_HASH)
3754  {
3755  if (spec->strategy != PARTITION_STRATEGY_HASH)
3756  ereport(ERROR,
3757  (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
3758  errmsg("invalid bound specification for a hash partition"),
3759  parser_errposition(pstate, exprLocation((Node *) spec))));
3760 
3761  if (spec->modulus <= 0)
3762  ereport(ERROR,
3763  (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
3764  errmsg("modulus for hash partition must be a positive integer")));
3765 
3766  Assert(spec->remainder >= 0);
3767 
3768  if (spec->remainder >= spec->modulus)
3769  ereport(ERROR,
3770  (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
3771  errmsg("remainder for hash partition must be less than modulus")));
3772  }
3773  else if (strategy == PARTITION_STRATEGY_LIST)
3774  {
3775  ListCell *cell;
3776  char *colname;
3777  Oid coltype;
3778  int32 coltypmod;
3779  Oid partcollation;
3780 
3781  if (spec->strategy != PARTITION_STRATEGY_LIST)
3782  ereport(ERROR,
3783  (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
3784  errmsg("invalid bound specification for a list partition"),
3785  parser_errposition(pstate, exprLocation((Node *) spec))));
3786 
3787  /* Get the only column's name in case we need to output an error */
3788  if (key->partattrs[0] != 0)
3789  colname = get_attname(RelationGetRelid(parent),
3790  key->partattrs[0], false);
3791  else
3792  colname = deparse_expression((Node *) linitial(partexprs),
3793  deparse_context_for(RelationGetRelationName(parent),
3794  RelationGetRelid(parent)),
3795  false, false);
3796  /* Need its type data too */
3797  coltype = get_partition_col_typid(key, 0);
3798  coltypmod = get_partition_col_typmod(key, 0);
3799  partcollation = get_partition_col_collation(key, 0);
3800 
3801  result_spec->listdatums = NIL;
3802  foreach(cell, spec->listdatums)
3803  {
3804  Node *expr = lfirst(cell);
3805  Const *value;
3806  ListCell *cell2;
3807  bool duplicate;
3808 
3809  value = transformPartitionBoundValue(pstate, expr,
3810  colname, coltype, coltypmod,
3811  partcollation);
3812 
3813  /* Don't add to the result if the value is a duplicate */
3814  duplicate = false;
3815  foreach(cell2, result_spec->listdatums)
3816  {
3817  Const *value2 = castNode(Const, lfirst(cell2));
3818 
3819  if (equal(value, value2))
3820  {
3821  duplicate = true;
3822  break;
3823  }
3824  }
3825  if (duplicate)
3826  continue;
3827 
3828  result_spec->listdatums = lappend(result_spec->listdatums,
3829  value);
3830  }
3831  }
3832  else if (strategy == PARTITION_STRATEGY_RANGE)
3833  {
3834  if (spec->strategy != PARTITION_STRATEGY_RANGE)
3835  ereport(ERROR,
3836  (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
3837  errmsg("invalid bound specification for a range partition"),
3838  parser_errposition(pstate, exprLocation((Node *) spec))));
3839 
3840  if (list_length(spec->lowerdatums) != partnatts)
3841  ereport(ERROR,
3842  (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
3843  errmsg("FROM must specify exactly one value per partitioning column")));
3844  if (list_length(spec->upperdatums) != partnatts)
3845  ereport(ERROR,
3846  (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
3847  errmsg("TO must specify exactly one value per partitioning column")));
3848 
3849  /*
3850  * Convert raw parse nodes into PartitionRangeDatum nodes and perform
3851  * any necessary validation.
3852  */
3853  result_spec->lowerdatums =
3854  transformPartitionRangeBounds(pstate, spec->lowerdatums,
3855  parent);
3856  result_spec->upperdatums =
3857  transformPartitionRangeBounds(pstate, spec->upperdatums,
3858  parent);
3859  }
3860  else
3861  elog(ERROR, "unexpected partition strategy: %d", (int) strategy);
3862 
3863  return result_spec;
3864 }
3865 
3866 /*
3867  * transformPartitionRangeBounds
3868  * This converts the expressions for range partition bounds from the raw
3869  * grammar representation to PartitionRangeDatum structs
3870  */
3871 static List *
3872 transformPartitionRangeBounds(ParseState *pstate, List *blist,
3873  Relation parent)
3874 {
3875  List *result = NIL;
3876  PartitionKey key = RelationGetPartitionKey(parent);
3877  List *partexprs = get_partition_exprs(key);
3878  ListCell *lc;
3879  int i,
3880  j;
3881 
3882  i = j = 0;
3883  foreach(lc, blist)
3884  {
3885  Node *expr = lfirst(lc);
3886  PartitionRangeDatum *prd = NULL;
3887 
3888  /*
3889  * Infinite range bounds -- "minvalue" and "maxvalue" -- get passed in
3890  * as ColumnRefs.
3891  */
3892  if (IsA(expr, ColumnRef))
3893  {
3894  ColumnRef *cref = (ColumnRef *) expr;
3895  char *cname = NULL;
3896 
3897  /*
3898  * There should be a single field named either "minvalue" or
3899  * "maxvalue".
3900  */
3901  if (list_length(cref->fields) == 1 &&
3902  IsA(linitial(cref->fields), String))
3903  cname = strVal(linitial(cref->fields));
3904 
3905  if (cname == NULL)
3906  {
3907  /*
3908  * ColumnRef is not in the desired single-field-name form. For
3909  * consistency between all partition strategies, let the
3910  * expression transformation report any errors rather than
3911  * doing it ourselves.
3912  */
3913  }
3914  else if (strcmp("minvalue", cname) == 0)
3915  {
3916  prd = makeNode(PartitionRangeDatum);
3917  prd->kind = PARTITION_RANGE_DATUM_MINVALUE;
3918  prd->value = NULL;
3919  }
3920  else if (strcmp("maxvalue", cname) == 0)
3921  {
3922  prd = makeNode(PartitionRangeDatum);
3923  prd->kind = PARTITION_RANGE_DATUM_MAXVALUE;
3924  prd->value = NULL;
3925  }
3926  }
3927 
3928  if (prd == NULL)
3929  {
3930  char *colname;
3931  Oid coltype;
3932  int32 coltypmod;
3933  Oid partcollation;
3934  Const *value;
3935 
3936  /* Get the column's name in case we need to output an error */
3937  if (key->partattrs[i] != 0)
3938  colname = get_attname(RelationGetRelid(parent),
3939  key->partattrs[i], false);
3940  else
3941  {
3942  colname = deparse_expression((Node *) list_nth(partexprs, j),
3943  deparse_context_for(RelationGetRelationName(parent),
3944  RelationGetRelid(parent)),
3945  false, false);
3946  ++j;
3947  }
3948 
3949  /* Need its type data too */
3950  coltype = get_partition_col_typid(key, i);
3951  coltypmod = get_partition_col_typmod(key, i);
3952  partcollation = get_partition_col_collation(key, i);
3953 
3954  value = transformPartitionBoundValue(pstate, expr,
3955  colname,
3956  coltype, coltypmod,
3957  partcollation);
3958  if (value->constisnull)
3959  ereport(ERROR,
3960  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
3961  errmsg("cannot specify NULL in range bound")));
3962  prd = makeNode(PartitionRangeDatum);
3963  prd->kind = PARTITION_RANGE_DATUM_VALUE;
3964  prd->value = (Node *) value;
3965  ++i;
3966  }
3967 
3968  prd->location = exprLocation(expr);
3969 
3970  result = lappend(result, prd);
3971  }
3972 
3973  /*
3974  * Once we see MINVALUE or MAXVALUE for one column, the remaining columns
3975  * must be the same.
3976  */
3977  validateInfiniteBounds(pstate, result);
3978 
3979  return result;
3980 }
3981 
3982 /*
3983  * validateInfiniteBounds
3984  *
3985  * Check that a MAXVALUE or MINVALUE specification in a partition bound is
3986  * followed only by more of the same.
3987  */
3988 static void
3989 validateInfiniteBounds(ParseState *pstate, List *blist)
3990 {
3991  ListCell *lc;
3992  PartitionRangeDatumKind kind = PARTITION_RANGE_DATUM_VALUE;
3993 
3994  foreach(lc, blist)
3995  {
3996  PartitionRangeDatum *prd = castNode(PartitionRangeDatum, lfirst(lc));
3997 
3998  if (kind == prd->kind)
3999  continue;
4000 
4001  switch (kind)
4002  {
4003  case PARTITION_RANGE_DATUM_VALUE:
4004  kind = prd->kind;
4005  break;
4006 
4007  case PARTITION_RANGE_DATUM_MAXVALUE:
4008  ereport(ERROR,
4009  (errcode(ERRCODE_DATATYPE_MISMATCH),
4010  errmsg("every bound following MAXVALUE must also be MAXVALUE"),
4011  parser_errposition(pstate, exprLocation((Node *) prd))));
4012  break;
4013 
4014  case PARTITION_RANGE_DATUM_MINVALUE:
4015  ereport(ERROR,
4016  (errcode(ERRCODE_DATATYPE_MISMATCH),
4017  errmsg("every bound following MINVALUE must also be MINVALUE"),
4018  parser_errposition(pstate, exprLocation((Node *) prd))));
4019  break;
4020  }
4021  }
4022 }
4023 
4024 /*
4025  * Transform one constant in a partition bound spec
4026  */
4027 static Const *
4028 transformPartitionBoundValue(ParseState *pstate, Node *val,
4029  const char *colName, Oid colType, int32 colTypmod,
4030  Oid partCollation)
4031 {
4032  Node *value;
4033 
4034  /* Transform raw parsetree */
4035  value = transformExpr(pstate, val, EXPR_KIND_PARTITION_BOUND);
4036 
4037  /*
4038  * Check that the input expression's collation is compatible with one
4039  * specified for the parent's partition key (partcollation). Don't throw
4040  * an error if it's the default collation which we'll replace with the
4041  * parent's collation anyway.
4042  */
4043  if (IsA(value, CollateExpr))
4044  {
4045  Oid exprCollOid = exprCollation(value);
4046 
4047  if (OidIsValid(exprCollOid) &&
4048  exprCollOid != DEFAULT_COLLATION_OID &&
4049  exprCollOid != partCollation)
4050  ereport(ERROR,
4051  (errcode(ERRCODE_DATATYPE_MISMATCH),
4052  errmsg("collation of partition bound value for column \"%s\" does not match partition key collation \"%s\"",
4053  colName, get_collation_name(partCollation)),
4054  parser_errposition(pstate, exprLocation(value))));
4055  }
4056 
4057  /* Coerce to correct type */
4058  value = coerce_to_target_type(pstate,
4059  value, exprType(value),
4060  colType,
4061  colTypmod,
4062  COERCION_ASSIGNMENT,
4063  COERCE_IMPLICIT_CAST,
4064  -1);
4065 
4066  if (value == NULL)
4067  ereport(ERROR,
4068  (errcode(ERRCODE_DATATYPE_MISMATCH),
4069  errmsg("specified value cannot be cast to type %s for column \"%s\"",
4070  format_type_be(colType), colName),
4071  parser_errposition(pstate, exprLocation(val))));
4072 
4073  /* Simplify the expression, in case we had a coercion */
4074  if (!IsA(value, Const))
4075  value = (Node *) expression_planner((Expr *) value);
4076 
4077  /*
4078  * transformExpr() should have already rejected column references,
4079  * subqueries, aggregates, window functions, and SRFs, based on the
4080  * EXPR_KIND_ for a default expression.
4081  */
4082  Assert(!contain_var_clause(value));
4083 
4084  /*
4085  * Evaluate the expression, assigning the partition key's collation to the
4086  * resulting Const expression.
4087  */
4088  value = (Node *) evaluate_expr((Expr *) value, colType, colTypmod,
4089  partCollation);
4090  if (!IsA(value, Const))
4091  elog(ERROR, "could not evaluate partition bound expression");
4092 
4093  return (Const *) value;
4094 }
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