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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 the default has been requested
1027  */
1028  if (attribute->atthasdef &&
1029  (table_like_clause->options & CREATE_TABLE_LIKE_DEFAULTS ||
1030  table_like_clause->options & CREATE_TABLE_LIKE_GENERATED))
1031  {
1032  Node *this_default = NULL;
1033  AttrDefault *attrdef;
1034  int i;
1035  bool found_whole_row;
1036 
1037  /* Find default in constraint structure */
1038  Assert(constr != NULL);
1039  attrdef = constr->defval;
1040  for (i = 0; i < constr->num_defval; i++)
1041  {
1042  if (attrdef[i].adnum == parent_attno)
1043  {
1044  this_default = stringToNode(attrdef[i].adbin);
1045  break;
1046  }
1047  }
1048  Assert(this_default != NULL);
1049 
1050  def->cooked_default = map_variable_attnos(this_default,
1051  1, 0,
1052  attmap, tupleDesc->natts,
1053  InvalidOid, &found_whole_row);
1054 
1055  /*
1056  * Prevent this for the same reason as for constraints below. Note
1057  * that defaults cannot contain any vars, so it's OK that the
1058  * error message refers to generated columns.
1059  */
1060  if (found_whole_row)
1061  ereport(ERROR,
1062  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1063  errmsg("cannot convert whole-row table reference"),
1064  errdetail("Generation expression for column \"%s\" contains a whole-row reference to table \"%s\".",
1065  attributeName,
1066  RelationGetRelationName(relation))));
1067 
1068  if (attribute->attgenerated &&
1069  (table_like_clause->options & CREATE_TABLE_LIKE_GENERATED))
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 and sort options. While the
2151  * index would still work as a constraint with non-default
2152  * settings, it might not provide exactly the same uniqueness
2153  * semantics as you'd get from a normally-created constraint;
2154  * and there's also the dump/reload problem mentioned above.
2155  */
2156  defopclass = GetDefaultOpClass(attform->atttypid,
2157  index_rel->rd_rel->relam);
2158  if (indclass->values[i] != defopclass ||
2159  index_rel->rd_indoption[i] != 0)
2160  ereport(ERROR,
2161  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2162  errmsg("index \"%s\" column number %d does not have default sorting behavior", index_name, i + 1),
2163  errdetail("Cannot create a primary key or unique constraint using such an index."),
2164  parser_errposition(cxt->pstate, constraint->location)));
2165 
2166  constraint->keys = lappend(constraint->keys, makeString(attname));
2167  }
2168  else
2169  constraint->including = lappend(constraint->including, makeString(attname));
2170  }
2171 
2172  /* Close the index relation but keep the lock */
2173  relation_close(index_rel, NoLock);
2174 
2175  index->indexOid = index_oid;
2176  }
2177 
2178  /*
2179  * If it's an EXCLUDE constraint, the grammar returns a list of pairs of
2180  * IndexElems and operator names. We have to break that apart into
2181  * separate lists.
2182  */
2183  if (constraint->contype == CONSTR_EXCLUSION)
2184  {
2185  foreach(lc, constraint->exclusions)
2186  {
2187  List *pair = (List *) lfirst(lc);
2188  IndexElem *elem;
2189  List *opname;
2190 
2191  Assert(list_length(pair) == 2);
2192  elem = linitial_node(IndexElem, pair);
2193  opname = lsecond_node(List, pair);
2194 
2195  index->indexParams = lappend(index->indexParams, elem);
2196  index->excludeOpNames = lappend(index->excludeOpNames, opname);
2197  }
2198  }
2199 
2200  /*
2201  * For UNIQUE and PRIMARY KEY, we just have a list of column names.
2202  *
2203  * Make sure referenced keys exist. If we are making a PRIMARY KEY index,
2204  * also make sure they are NOT NULL.
2205  */
2206  else
2207  {
2208  foreach(lc, constraint->keys)
2209  {
2210  char *key = strVal(lfirst(lc));
2211  bool found = false;
2212  bool forced_not_null = false;
2213  ColumnDef *column = NULL;
2214  ListCell *columns;
2215  IndexElem *iparam;
2216 
2217  /* Make sure referenced column exists. */
2218  foreach(columns, cxt->columns)
2219  {
2220  column = castNode(ColumnDef, lfirst(columns));
2221  if (strcmp(column->colname, key) == 0)
2222  {
2223  found = true;
2224  break;
2225  }
2226  }
2227  if (found)
2228  {
2229  /*
2230  * column is defined in the new table. For PRIMARY KEY, we
2231  * can apply the NOT NULL constraint cheaply here ... unless
2232  * the column is marked is_from_type, in which case marking it
2233  * here would be ineffective (see MergeAttributes).
2234  */
2235  if (constraint->contype == CONSTR_PRIMARY &&
2236  !column->is_from_type)
2237  {
2238  column->is_not_null = true;
2239  forced_not_null = true;
2240  }
2241  }
2242  else if (SystemAttributeByName(key) != NULL)
2243  {
2244  /*
2245  * column will be a system column in the new table, so accept
2246  * it. System columns can't ever be null, so no need to worry
2247  * about PRIMARY/NOT NULL constraint.
2248  */
2249  found = true;
2250  }
2251  else if (cxt->inhRelations)
2252  {
2253  /* try inherited tables */
2254  ListCell *inher;
2255 
2256  foreach(inher, cxt->inhRelations)
2257  {
2258  RangeVar *inh = castNode(RangeVar, lfirst(inher));
2259  Relation rel;
2260  int count;
2261 
2262  rel = table_openrv(inh, AccessShareLock);
2263  /* check user requested inheritance from valid relkind */
2264  if (rel->rd_rel->relkind != RELKIND_RELATION &&
2265  rel->rd_rel->relkind != RELKIND_FOREIGN_TABLE &&
2266  rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
2267  ereport(ERROR,
2268  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2269  errmsg("inherited relation \"%s\" is not a table or foreign table",
2270  inh->relname)));
2271  for (count = 0; count < rel->rd_att->natts; count++)
2272  {
2273  Form_pg_attribute inhattr = TupleDescAttr(rel->rd_att,
2274  count);
2275  char *inhname = NameStr(inhattr->attname);
2276 
2277  if (inhattr->attisdropped)
2278  continue;
2279  if (strcmp(key, inhname) == 0)
2280  {
2281  found = true;
2282 
2283  /*
2284  * It's tempting to set forced_not_null if the
2285  * parent column is already NOT NULL, but that
2286  * seems unsafe because the column's NOT NULL
2287  * marking might disappear between now and
2288  * execution. Do the runtime check to be safe.
2289  */
2290  break;
2291  }
2292  }
2293  table_close(rel, NoLock);
2294  if (found)
2295  break;
2296  }
2297  }
2298 
2299  /*
2300  * In the ALTER TABLE case, don't complain about index keys not
2301  * created in the command; they may well exist already.
2302  * DefineIndex will complain about them if not.
2303  */
2304  if (!found && !cxt->isalter)
2305  ereport(ERROR,
2306  (errcode(ERRCODE_UNDEFINED_COLUMN),
2307  errmsg("column \"%s\" named in key does not exist", key),
2308  parser_errposition(cxt->pstate, constraint->location)));
2309 
2310  /* Check for PRIMARY KEY(foo, foo) */
2311  foreach(columns, index->indexParams)
2312  {
2313  iparam = (IndexElem *) lfirst(columns);
2314  if (iparam->name && strcmp(key, iparam->name) == 0)
2315  {
2316  if (index->primary)
2317  ereport(ERROR,
2318  (errcode(ERRCODE_DUPLICATE_COLUMN),
2319  errmsg("column \"%s\" appears twice in primary key constraint",
2320  key),
2321  parser_errposition(cxt->pstate, constraint->location)));
2322  else
2323  ereport(ERROR,
2324  (errcode(ERRCODE_DUPLICATE_COLUMN),
2325  errmsg("column \"%s\" appears twice in unique constraint",
2326  key),
2327  parser_errposition(cxt->pstate, constraint->location)));
2328  }
2329  }
2330 
2331  /* OK, add it to the index definition */
2332  iparam = makeNode(IndexElem);
2333  iparam->name = pstrdup(key);
2334  iparam->expr = NULL;
2335  iparam->indexcolname = NULL;
2336  iparam->collation = NIL;
2337  iparam->opclass = NIL;
2338  iparam->ordering = SORTBY_DEFAULT;
2339  iparam->nulls_ordering = SORTBY_NULLS_DEFAULT;
2340  index->indexParams = lappend(index->indexParams, iparam);
2341 
2342  /*
2343  * For a primary-key column, also create an item for ALTER TABLE
2344  * SET NOT NULL if we couldn't ensure it via is_not_null above.
2345  */
2346  if (constraint->contype == CONSTR_PRIMARY && !forced_not_null)
2347  {
2348  AlterTableCmd *notnullcmd = makeNode(AlterTableCmd);
2349 
2350  notnullcmd->subtype = AT_SetNotNull;
2351  notnullcmd->name = pstrdup(key);
2352  notnullcmds = lappend(notnullcmds, notnullcmd);
2353  }
2354  }
2355  }
2356 
2357  /*
2358  * Add included columns to index definition. This is much like the
2359  * simple-column-name-list code above, except that we don't worry about
2360  * NOT NULL marking; included columns in a primary key should not be
2361  * forced NOT NULL. We don't complain about duplicate columns, either,
2362  * though maybe we should?
2363  */
2364  foreach(lc, constraint->including)
2365  {
2366  char *key = strVal(lfirst(lc));
2367  bool found = false;
2368  ColumnDef *column = NULL;
2369  ListCell *columns;
2370  IndexElem *iparam;
2371 
2372  foreach(columns, cxt->columns)
2373  {
2374  column = lfirst_node(ColumnDef, columns);
2375  if (strcmp(column->colname, key) == 0)
2376  {
2377  found = true;
2378  break;
2379  }
2380  }
2381 
2382  if (!found)
2383  {
2384  if (SystemAttributeByName(key) != NULL)
2385  {
2386  /*
2387  * column will be a system column in the new table, so accept
2388  * it.
2389  */
2390  found = true;
2391  }
2392  else if (cxt->inhRelations)
2393  {
2394  /* try inherited tables */
2395  ListCell *inher;
2396 
2397  foreach(inher, cxt->inhRelations)
2398  {
2399  RangeVar *inh = lfirst_node(RangeVar, inher);
2400  Relation rel;
2401  int count;
2402 
2403  rel = table_openrv(inh, AccessShareLock);
2404  /* check user requested inheritance from valid relkind */
2405  if (rel->rd_rel->relkind != RELKIND_RELATION &&
2406  rel->rd_rel->relkind != RELKIND_FOREIGN_TABLE &&
2407  rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
2408  ereport(ERROR,
2409  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2410  errmsg("inherited relation \"%s\" is not a table or foreign table",
2411  inh->relname)));
2412  for (count = 0; count < rel->rd_att->natts; count++)
2413  {
2414  Form_pg_attribute inhattr = TupleDescAttr(rel->rd_att,
2415  count);
2416  char *inhname = NameStr(inhattr->attname);
2417 
2418  if (inhattr->attisdropped)
2419  continue;
2420  if (strcmp(key, inhname) == 0)
2421  {
2422  found = true;
2423  break;
2424  }
2425  }
2426  table_close(rel, NoLock);
2427  if (found)
2428  break;
2429  }
2430  }
2431  }
2432 
2433  /*
2434  * In the ALTER TABLE case, don't complain about index keys not
2435  * created in the command; they may well exist already. DefineIndex
2436  * will complain about them if not.
2437  */
2438  if (!found && !cxt->isalter)
2439  ereport(ERROR,
2440  (errcode(ERRCODE_UNDEFINED_COLUMN),
2441  errmsg("column \"%s\" named in key does not exist", key),
2442  parser_errposition(cxt->pstate, constraint->location)));
2443 
2444  /* OK, add it to the index definition */
2445  iparam = makeNode(IndexElem);
2446  iparam->name = pstrdup(key);
2447  iparam->expr = NULL;
2448  iparam->indexcolname = NULL;
2449  iparam->collation = NIL;
2450  iparam->opclass = NIL;
2451  index->indexIncludingParams = lappend(index->indexIncludingParams, iparam);
2452  }
2453 
2454  /*
2455  * If we found anything that requires run-time SET NOT NULL, build a full
2456  * ALTER TABLE command for that and add it to cxt->alist.
2457  */
2458  if (notnullcmds)
2459  {
2460  AlterTableStmt *alterstmt = makeNode(AlterTableStmt);
2461 
2462  alterstmt->relation = copyObject(cxt->relation);
2463  alterstmt->cmds = notnullcmds;
2464  alterstmt->relkind = OBJECT_TABLE;
2465  alterstmt->missing_ok = false;
2466 
2467  cxt->alist = lappend(cxt->alist, alterstmt);
2468  }
2469 
2470  return index;
2471 }
2472 
2473 /*
2474  * transformExtendedStatistics
2475  * Handle extended statistic objects
2476  *
2477  * Right now, there's nothing to do here, so we just append the list to
2478  * the existing "after" list.
2479  */
2480 static void
2481 transformExtendedStatistics(CreateStmtContext *cxt)
2482 {
2483  cxt->alist = list_concat(cxt->alist, cxt->extstats);
2484 }
2485 
2486 /*
2487  * transformCheckConstraints
2488  * handle CHECK constraints
2489  *
2490  * Right now, there's nothing to do here when called from ALTER TABLE,
2491  * but the other constraint-transformation functions are called in both
2492  * the CREATE TABLE and ALTER TABLE paths, so do the same here, and just
2493  * don't do anything if we're not authorized to skip validation.
2494  */
2495 static void
2496 transformCheckConstraints(CreateStmtContext *cxt, bool skipValidation)
2497 {
2498  ListCell *ckclist;
2499 
2500  if (cxt->ckconstraints == NIL)
2501  return;
2502 
2503  /*
2504  * If creating a new table (but not a foreign table), we can safely skip
2505  * validation of check constraints, and nonetheless mark them valid. (This
2506  * will override any user-supplied NOT VALID flag.)
2507  */
2508  if (skipValidation)
2509  {
2510  foreach(ckclist, cxt->ckconstraints)
2511  {
2512  Constraint *constraint = (Constraint *) lfirst(ckclist);
2513 
2514  constraint->skip_validation = true;
2515  constraint->initially_valid = true;
2516  }
2517  }
2518 }
2519 
2520 /*
2521  * transformFKConstraints
2522  * handle FOREIGN KEY constraints
2523  */
2524 static void
2525 transformFKConstraints(CreateStmtContext *cxt,
2526  bool skipValidation, bool isAddConstraint)
2527 {
2528  ListCell *fkclist;
2529 
2530  if (cxt->fkconstraints == NIL)
2531  return;
2532 
2533  /*
2534  * If CREATE TABLE or adding a column with NULL default, we can safely
2535  * skip validation of FK constraints, and nonetheless mark them valid.
2536  * (This will override any user-supplied NOT VALID flag.)
2537  */
2538  if (skipValidation)
2539  {
2540  foreach(fkclist, cxt->fkconstraints)
2541  {
2542  Constraint *constraint = (Constraint *) lfirst(fkclist);
2543 
2544  constraint->skip_validation = true;
2545  constraint->initially_valid = true;
2546  }
2547  }
2548 
2549  /*
2550  * For CREATE TABLE or ALTER TABLE ADD COLUMN, gin up an ALTER TABLE ADD
2551  * CONSTRAINT command to execute after the basic command is complete. (If
2552  * called from ADD CONSTRAINT, that routine will add the FK constraints to
2553  * its own subcommand list.)
2554  *
2555  * Note: the ADD CONSTRAINT command must also execute after any index
2556  * creation commands. Thus, this should run after
2557  * transformIndexConstraints, so that the CREATE INDEX commands are
2558  * already in cxt->alist.
2559  */
2560  if (!isAddConstraint)
2561  {
2562  AlterTableStmt *alterstmt = makeNode(AlterTableStmt);
2563 
2564  alterstmt->relation = cxt->relation;
2565  alterstmt->cmds = NIL;
2566  alterstmt->relkind = OBJECT_TABLE;
2567 
2568  foreach(fkclist, cxt->fkconstraints)
2569  {
2570  Constraint *constraint = (Constraint *) lfirst(fkclist);
2571  AlterTableCmd *altercmd = makeNode(AlterTableCmd);
2572 
2573  altercmd->subtype = AT_ProcessedConstraint;
2574  altercmd->name = NULL;
2575  altercmd->def = (Node *) constraint;
2576  alterstmt->cmds = lappend(alterstmt->cmds, altercmd);
2577  }
2578 
2579  cxt->alist = lappend(cxt->alist, alterstmt);
2580  }
2581 }
2582 
2583 /*
2584  * transformIndexStmt - parse analysis for CREATE INDEX and ALTER TABLE
2585  *
2586  * Note: this is a no-op for an index not using either index expressions or
2587  * a predicate expression. There are several code paths that create indexes
2588  * without bothering to call this, because they know they don't have any
2589  * such expressions to deal with.
2590  *
2591  * To avoid race conditions, it's important that this function rely only on
2592  * the passed-in relid (and not on stmt->relation) to determine the target
2593  * relation.
2594  */
2595 IndexStmt *
2596 transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
2597 {
2598  ParseState *pstate;
2599  RangeTblEntry *rte;
2600  ListCell *l;
2601  Relation rel;
2602 
2603  /* Nothing to do if statement already transformed. */
2604  if (stmt->transformed)
2605  return stmt;
2606 
2607  /*
2608  * We must not scribble on the passed-in IndexStmt, so copy it. (This is
2609  * overkill, but easy.)
2610  */
2611  stmt = copyObject(stmt);
2612 
2613  /* Set up pstate */
2614  pstate = make_parsestate(NULL);
2615  pstate->p_sourcetext = queryString;
2616 
2617  /*
2618  * Put the parent table into the rtable so that the expressions can refer
2619  * to its fields without qualification. Caller is responsible for locking
2620  * relation, but we still need to open it.
2621  */
2622  rel = relation_open(relid, NoLock);
2623  rte = addRangeTableEntryForRelation(pstate, rel,
2624  AccessShareLock,
2625  NULL, false, true);
2626 
2627  /* no to join list, yes to namespaces */
2628  addRTEtoQuery(pstate, rte, false, true, true);
2629 
2630  /* take care of the where clause */
2631  if (stmt->whereClause)
2632  {
2633  stmt->whereClause = transformWhereClause(pstate,
2634  stmt->whereClause,
2635  EXPR_KIND_INDEX_PREDICATE,
2636  "WHERE");
2637  /* we have to fix its collations too */
2638  assign_expr_collations(pstate, stmt->whereClause);
2639  }
2640 
2641  /* take care of any index expressions */
2642  foreach(l, stmt->indexParams)
2643  {
2644  IndexElem *ielem = (IndexElem *) lfirst(l);
2645 
2646  if (ielem->expr)
2647  {
2648  /* Extract preliminary index col name before transforming expr */
2649  if (ielem->indexcolname == NULL)
2650  ielem->indexcolname = FigureIndexColname(ielem->expr);
2651 
2652  /* Now do parse transformation of the expression */
2653  ielem->expr = transformExpr(pstate, ielem->expr,
2654  EXPR_KIND_INDEX_EXPRESSION);
2655 
2656  /* We have to fix its collations too */
2657  assign_expr_collations(pstate, ielem->expr);
2658 
2659  /*
2660  * transformExpr() should have already rejected subqueries,
2661  * aggregates, window functions, and SRFs, based on the EXPR_KIND_
2662  * for an index expression.
2663  *
2664  * DefineIndex() will make more checks.
2665  */
2666  }
2667  }
2668 
2669  /*
2670  * Check that only the base rel is mentioned. (This should be dead code
2671  * now that add_missing_from is history.)
2672  */
2673  if (list_length(pstate->p_rtable) != 1)
2674  ereport(ERROR,
2675  (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
2676  errmsg("index expressions and predicates can refer only to the table being indexed")));
2677 
2678  free_parsestate(pstate);
2679 
2680  /* Close relation */
2681  table_close(rel, NoLock);
2682 
2683  /* Mark statement as successfully transformed */
2684  stmt->transformed = true;
2685 
2686  return stmt;
2687 }
2688 
2689 
2690 /*
2691  * transformRuleStmt -
2692  * transform a CREATE RULE Statement. The action is a list of parse
2693  * trees which is transformed into a list of query trees, and we also
2694  * transform the WHERE clause if any.
2695  *
2696  * actions and whereClause are output parameters that receive the
2697  * transformed results.
2698  *
2699  * Note that we must not scribble on the passed-in RuleStmt, so we do
2700  * copyObject() on the actions and WHERE clause.
2701  */
2702 void
2703 transformRuleStmt(RuleStmt *stmt, const char *queryString,
2704  List **actions, Node **whereClause)
2705 {
2706  Relation rel;
2707  ParseState *pstate;
2708  RangeTblEntry *oldrte;
2709  RangeTblEntry *newrte;
2710 
2711  /*
2712  * To avoid deadlock, make sure the first thing we do is grab
2713  * AccessExclusiveLock on the target relation. This will be needed by
2714  * DefineQueryRewrite(), and we don't want to grab a lesser lock
2715  * beforehand.
2716  */
2717  rel = table_openrv(stmt->relation, AccessExclusiveLock);
2718 
2719  if (rel->rd_rel->relkind == RELKIND_MATVIEW)
2720  ereport(ERROR,
2721  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2722  errmsg("rules on materialized views are not supported")));
2723 
2724  /* Set up pstate */
2725  pstate = make_parsestate(NULL);
2726  pstate->p_sourcetext = queryString;
2727 
2728  /*
2729  * NOTE: 'OLD' must always have a varno equal to 1 and 'NEW' equal to 2.
2730  * Set up their RTEs in the main pstate for use in parsing the rule
2731  * qualification.
2732  */
2733  oldrte = addRangeTableEntryForRelation(pstate, rel,
2734  AccessShareLock,
2735  makeAlias("old", NIL),
2736  false, false);
2737  newrte = addRangeTableEntryForRelation(pstate, rel,
2738  AccessShareLock,
2739  makeAlias("new", NIL),
2740  false, false);
2741  /* Must override addRangeTableEntry's default access-check flags */
2742  oldrte->requiredPerms = 0;
2743  newrte->requiredPerms = 0;
2744 
2745  /*
2746  * They must be in the namespace too for lookup purposes, but only add the
2747  * one(s) that are relevant for the current kind of rule. In an UPDATE
2748  * rule, quals must refer to OLD.field or NEW.field to be unambiguous, but
2749  * there's no need to be so picky for INSERT & DELETE. We do not add them
2750  * to the joinlist.
2751  */
2752  switch (stmt->event)
2753  {
2754  case CMD_SELECT:
2755  addRTEtoQuery(pstate, oldrte, false, true, true);
2756  break;
2757  case CMD_UPDATE:
2758  addRTEtoQuery(pstate, oldrte, false, true, true);
2759  addRTEtoQuery(pstate, newrte, false, true, true);
2760  break;
2761  case CMD_INSERT:
2762  addRTEtoQuery(pstate, newrte, false, true, true);
2763  break;
2764  case CMD_DELETE:
2765  addRTEtoQuery(pstate, oldrte, false, true, true);
2766  break;
2767  default:
2768  elog(ERROR, "unrecognized event type: %d",
2769  (int) stmt->event);
2770  break;
2771  }
2772 
2773  /* take care of the where clause */
2774  *whereClause = transformWhereClause(pstate,
2775  (Node *) copyObject(stmt->whereClause),
2776  EXPR_KIND_WHERE,
2777  "WHERE");
2778  /* we have to fix its collations too */
2779  assign_expr_collations(pstate, *whereClause);
2780 
2781  /* this is probably dead code without add_missing_from: */
2782  if (list_length(pstate->p_rtable) != 2) /* naughty, naughty... */
2783  ereport(ERROR,
2784  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
2785  errmsg("rule WHERE condition cannot contain references to other relations")));
2786 
2787  /*
2788  * 'instead nothing' rules with a qualification need a query rangetable so
2789  * the rewrite handler can add the negated rule qualification to the
2790  * original query. We create a query with the new command type CMD_NOTHING
2791  * here that is treated specially by the rewrite system.
2792  */
2793  if (stmt->actions == NIL)
2794  {
2795  Query *nothing_qry = makeNode(Query);
2796 
2797  nothing_qry->commandType = CMD_NOTHING;
2798  nothing_qry->rtable = pstate->p_rtable;
2799  nothing_qry->jointree = makeFromExpr(NIL, NULL); /* no join wanted */
2800 
2801  *actions = list_make1(nothing_qry);
2802  }
2803  else
2804  {
2805  ListCell *l;
2806  List *newactions = NIL;
2807 
2808  /*
2809  * transform each statement, like parse_sub_analyze()
2810  */
2811  foreach(l, stmt->actions)
2812  {
2813  Node *action = (Node *) lfirst(l);
2814  ParseState *sub_pstate = make_parsestate(NULL);
2815  Query *sub_qry,
2816  *top_subqry;
2817  bool has_old,
2818  has_new;
2819 
2820  /*
2821  * Since outer ParseState isn't parent of inner, have to pass down
2822  * the query text by hand.
2823  */
2824  sub_pstate->p_sourcetext = queryString;
2825 
2826  /*
2827  * Set up OLD/NEW in the rtable for this statement. The entries
2828  * are added only to relnamespace, not varnamespace, because we
2829  * don't want them to be referred to by unqualified field names
2830  * nor "*" in the rule actions. We decide later whether to put
2831  * them in the joinlist.
2832  */
2833  oldrte = addRangeTableEntryForRelation(sub_pstate, rel,
2834  AccessShareLock,
2835  makeAlias("old", NIL),
2836  false, false);
2837  newrte = addRangeTableEntryForRelation(sub_pstate, rel,
2838  AccessShareLock,
2839  makeAlias("new", NIL),
2840  false, false);
2841  oldrte->requiredPerms = 0;
2842  newrte->requiredPerms = 0;
2843  addRTEtoQuery(sub_pstate, oldrte, false, true, false);
2844  addRTEtoQuery(sub_pstate, newrte, false, true, false);
2845 
2846  /* Transform the rule action statement */
2847  top_subqry = transformStmt(sub_pstate,
2848  (Node *) copyObject(action));
2849 
2850  /*
2851  * We cannot support utility-statement actions (eg NOTIFY) with
2852  * nonempty rule WHERE conditions, because there's no way to make
2853  * the utility action execute conditionally.
2854  */
2855  if (top_subqry->commandType == CMD_UTILITY &&
2856  *whereClause != NULL)
2857  ereport(ERROR,
2858  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
2859  errmsg("rules with WHERE conditions can only have SELECT, INSERT, UPDATE, or DELETE actions")));
2860 
2861  /*
2862  * If the action is INSERT...SELECT, OLD/NEW have been pushed down
2863  * into the SELECT, and that's what we need to look at. (Ugly
2864  * kluge ... try to fix this when we redesign querytrees.)
2865  */
2866  sub_qry = getInsertSelectQuery(top_subqry, NULL);
2867 
2868  /*
2869  * If the sub_qry is a setop, we cannot attach any qualifications
2870  * to it, because the planner won't notice them. This could
2871  * perhaps be relaxed someday, but for now, we may as well reject
2872  * such a rule immediately.
2873  */
2874  if (sub_qry->setOperations != NULL && *whereClause != NULL)
2875  ereport(ERROR,
2876  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2877  errmsg("conditional UNION/INTERSECT/EXCEPT statements are not implemented")));
2878 
2879  /*
2880  * Validate action's use of OLD/NEW, qual too
2881  */
2882  has_old =
2883  rangeTableEntry_used((Node *) sub_qry, PRS2_OLD_VARNO, 0) ||
2884  rangeTableEntry_used(*whereClause, PRS2_OLD_VARNO, 0);
2885  has_new =
2886  rangeTableEntry_used((Node *) sub_qry, PRS2_NEW_VARNO, 0) ||
2887  rangeTableEntry_used(*whereClause, PRS2_NEW_VARNO, 0);
2888 
2889  switch (stmt->event)
2890  {
2891  case CMD_SELECT:
2892  if (has_old)
2893  ereport(ERROR,
2894  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
2895  errmsg("ON SELECT rule cannot use OLD")));
2896  if (has_new)
2897  ereport(ERROR,
2898  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
2899  errmsg("ON SELECT rule cannot use NEW")));
2900  break;
2901  case CMD_UPDATE:
2902  /* both are OK */
2903  break;
2904  case CMD_INSERT:
2905  if (has_old)
2906  ereport(ERROR,
2907  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
2908  errmsg("ON INSERT rule cannot use OLD")));
2909  break;
2910  case CMD_DELETE:
2911  if (has_new)
2912  ereport(ERROR,
2913  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
2914  errmsg("ON DELETE rule cannot use NEW")));
2915  break;
2916  default:
2917  elog(ERROR, "unrecognized event type: %d",
2918  (int) stmt->event);
2919  break;
2920  }
2921 
2922  /*
2923  * OLD/NEW are not allowed in WITH queries, because they would
2924  * amount to outer references for the WITH, which we disallow.
2925  * However, they were already in the outer rangetable when we
2926  * analyzed the query, so we have to check.
2927  *
2928  * Note that in the INSERT...SELECT case, we need to examine the
2929  * CTE lists of both top_subqry and sub_qry.
2930  *
2931  * Note that we aren't digging into the body of the query looking
2932  * for WITHs in nested sub-SELECTs. A WITH down there can
2933  * legitimately refer to OLD/NEW, because it'd be an
2934  * indirect-correlated outer reference.
2935  */
2936  if (rangeTableEntry_used((Node *) top_subqry->cteList,
2937  PRS2_OLD_VARNO, 0) ||
2938  rangeTableEntry_used((Node *) sub_qry->cteList,
2939  PRS2_OLD_VARNO, 0))
2940  ereport(ERROR,
2941  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2942  errmsg("cannot refer to OLD within WITH query")));
2943  if (rangeTableEntry_used((Node *) top_subqry->cteList,
2944  PRS2_NEW_VARNO, 0) ||
2945  rangeTableEntry_used((Node *) sub_qry->cteList,
2946  PRS2_NEW_VARNO, 0))
2947  ereport(ERROR,
2948  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2949  errmsg("cannot refer to NEW within WITH query")));
2950 
2951  /*
2952  * For efficiency's sake, add OLD to the rule action's jointree
2953  * only if it was actually referenced in the statement or qual.
2954  *
2955  * For INSERT, NEW is not really a relation (only a reference to
2956  * the to-be-inserted tuple) and should never be added to the
2957  * jointree.
2958  *
2959  * For UPDATE, we treat NEW as being another kind of reference to
2960  * OLD, because it represents references to *transformed* tuples
2961  * of the existing relation. It would be wrong to enter NEW
2962  * separately in the jointree, since that would cause a double
2963  * join of the updated relation. It's also wrong to fail to make
2964  * a jointree entry if only NEW and not OLD is mentioned.
2965  */
2966  if (has_old || (has_new && stmt->event == CMD_UPDATE))
2967  {
2968  /*
2969  * If sub_qry is a setop, manipulating its jointree will do no
2970  * good at all, because the jointree is dummy. (This should be
2971  * a can't-happen case because of prior tests.)
2972  */
2973  if (sub_qry->setOperations != NULL)
2974  ereport(ERROR,
2975  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2976  errmsg("conditional UNION/INTERSECT/EXCEPT statements are not implemented")));
2977  /* hack so we can use addRTEtoQuery() */
2978  sub_pstate->p_rtable = sub_qry->rtable;
2979  sub_pstate->p_joinlist = sub_qry->jointree->fromlist;
2980  addRTEtoQuery(sub_pstate, oldrte, true, false, false);
2981  sub_qry->jointree->fromlist = sub_pstate->p_joinlist;
2982  }
2983 
2984  newactions = lappend(newactions, top_subqry);
2985 
2986  free_parsestate(sub_pstate);
2987  }
2988 
2989  *actions = newactions;
2990  }
2991 
2992  free_parsestate(pstate);
2993 
2994  /* Close relation, but keep the exclusive lock */
2995  table_close(rel, NoLock);
2996 }
2997 
2998 
2999 /*
3000  * transformAlterTableStmt -
3001  * parse analysis for ALTER TABLE
3002  *
3003  * Returns a List of utility commands to be done in sequence. One of these
3004  * will be the transformed AlterTableStmt, but there may be additional actions
3005  * to be done before and after the actual AlterTable() call.
3006  *
3007  * To avoid race conditions, it's important that this function rely only on
3008  * the passed-in relid (and not on stmt->relation) to determine the target
3009  * relation.
3010  */
3011 List *
3012 transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
3013  const char *queryString)
3014 {
3015  Relation rel;
3016  TupleDesc tupdesc;
3017  ParseState *pstate;
3018  CreateStmtContext cxt;
3019  List *result;
3020  List *save_alist;
3021  ListCell *lcmd,
3022  *l;
3023  List *newcmds = NIL;
3024  bool skipValidation = true;
3025  AlterTableCmd *newcmd;
3026  RangeTblEntry *rte;
3027 
3028  /*
3029  * We must not scribble on the passed-in AlterTableStmt, so copy it. (This
3030  * is overkill, but easy.)
3031  */
3032  stmt = copyObject(stmt);
3033 
3034  /* Caller is responsible for locking the relation */
3035  rel = relation_open(relid, NoLock);
3036  tupdesc = RelationGetDescr(rel);
3037 
3038  /* Set up pstate */
3039  pstate = make_parsestate(NULL);
3040  pstate->p_sourcetext = queryString;
3041  rte = addRangeTableEntryForRelation(pstate,
3042  rel,
3043  AccessShareLock,
3044  NULL,
3045  false,
3046  true);
3047  addRTEtoQuery(pstate, rte, false, true, true);
3048 
3049  /* Set up CreateStmtContext */
3050  cxt.pstate = pstate;
3051  if (stmt->relkind == OBJECT_FOREIGN_TABLE)
3052  {
3053  cxt.stmtType = "ALTER FOREIGN TABLE";
3054  cxt.isforeign = true;
3055  }
3056  else
3057  {
3058  cxt.stmtType = "ALTER TABLE";
3059  cxt.isforeign = false;
3060  }
3061  cxt.relation = stmt->relation;
3062  cxt.rel = rel;
3063  cxt.inhRelations = NIL;
3064  cxt.isalter = true;
3065  cxt.columns = NIL;
3066  cxt.ckconstraints = NIL;
3067  cxt.fkconstraints = NIL;
3068  cxt.ixconstraints = NIL;
3069  cxt.inh_indexes = NIL;
3070  cxt.extstats = NIL;
3071  cxt.blist = NIL;
3072  cxt.alist = NIL;
3073  cxt.pkey = NULL;
3074  cxt.ispartitioned = (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
3075  cxt.partbound = NULL;
3076  cxt.ofType = false;
3077 
3078  /*
3079  * The only subtypes that currently require parse transformation handling
3080  * are ADD COLUMN, ADD CONSTRAINT and SET DATA TYPE. These largely re-use
3081  * code from CREATE TABLE.
3082  */
3083  foreach(lcmd, stmt->cmds)
3084  {
3085  AlterTableCmd *cmd = (AlterTableCmd *) lfirst(lcmd);
3086 
3087  switch (cmd->subtype)
3088  {
3089  case AT_AddColumn:
3090  case AT_AddColumnToView:
3091  {
3092  ColumnDef *def = castNode(ColumnDef, cmd->def);
3093 
3094  transformColumnDefinition(&cxt, def);
3095 
3096  /*
3097  * If the column has a non-null default, we can't skip
3098  * validation of foreign keys.
3099  */
3100  if (def->raw_default != NULL)
3101  skipValidation = false;
3102 
3103  /*
3104  * All constraints are processed in other ways. Remove the
3105  * original list
3106  */
3107  def->constraints = NIL;
3108 
3109  newcmds = lappend(newcmds, cmd);
3110  break;
3111  }
3112 
3113  case AT_AddConstraint:
3114 
3115  /*
3116  * The original AddConstraint cmd node doesn't go to newcmds
3117  */
3118  if (IsA(cmd->def, Constraint))
3119  {
3120  transformTableConstraint(&cxt, (Constraint *) cmd->def);
3121  if (((Constraint *) cmd->def)->contype == CONSTR_FOREIGN)
3122  skipValidation = false;
3123  }
3124  else
3125  elog(ERROR, "unrecognized node type: %d",
3126  (int) nodeTag(cmd->def));
3127  break;
3128 
3129  case AT_ProcessedConstraint:
3130 
3131  /*
3132  * Already-transformed ADD CONSTRAINT, so just make it look
3133  * like the standard case.
3134  */
3135  cmd->subtype = AT_AddConstraint;
3136  newcmds = lappend(newcmds, cmd);
3137  break;
3138 
3139  case AT_AlterColumnType:
3140  {
3141  ColumnDef *def = (ColumnDef *) cmd->def;
3142  AttrNumber attnum;
3143 
3144  /*
3145  * For ALTER COLUMN TYPE, transform the USING clause if
3146  * one was specified.
3147  */
3148  if (def->raw_default)
3149  {
3150  def->cooked_default =
3151  transformExpr(pstate, def->raw_default,
3152  EXPR_KIND_ALTER_COL_TRANSFORM);
3153  }
3154 
3155  /*
3156  * For identity column, create ALTER SEQUENCE command to
3157  * change the data type of the sequence.
3158  */
3159  attnum = get_attnum(relid, cmd->name);
3160 
3161  /*
3162  * if attribute not found, something will error about it
3163  * later
3164  */
3165  if (attnum != InvalidAttrNumber &&
3166  TupleDescAttr(tupdesc, attnum - 1)->attidentity)
3167  {
3168  Oid seq_relid = getIdentitySequence(relid, attnum, false);
3169  Oid typeOid = typenameTypeId(pstate, def->typeName);
3170  AlterSeqStmt *altseqstmt = makeNode(AlterSeqStmt);
3171 
3172  altseqstmt->sequence = makeRangeVar(get_namespace_name(get_rel_namespace(seq_relid)),
3173  get_rel_name(seq_relid),
3174  -1);
3175  altseqstmt->options = list_make1(makeDefElem("as", (Node *) makeTypeNameFromOid(typeOid, -1), -1));
3176  altseqstmt->for_identity = true;
3177  cxt.blist = lappend(cxt.blist, altseqstmt);
3178  }
3179 
3180  newcmds = lappend(newcmds, cmd);
3181  break;
3182  }
3183 
3184  case AT_AddIdentity:
3185  {
3186  Constraint *def = castNode(Constraint, cmd->def);
3187  ColumnDef *newdef = makeNode(ColumnDef);
3188  AttrNumber attnum;
3189 
3190  newdef->colname = cmd->name;
3191  newdef->identity = def->generated_when;
3192  cmd->def = (Node *) newdef;
3193 
3194  attnum = get_attnum(relid, cmd->name);
3195 
3196  /*
3197  * if attribute not found, something will error about it
3198  * later
3199  */
3200  if (attnum != InvalidAttrNumber)
3201  generateSerialExtraStmts(&cxt, newdef,
3202  get_atttype(relid, attnum),
3203  def->options, true,
3204  NULL, NULL);
3205 
3206  newcmds = lappend(newcmds, cmd);
3207  break;
3208  }
3209 
3210  case AT_SetIdentity:
3211  {
3212  /*
3213  * Create an ALTER SEQUENCE statement for the internal
3214  * sequence of the identity column.
3215  */
3216  ListCell *lc;
3217  List *newseqopts = NIL;
3218  List *newdef = NIL;
3219  AttrNumber attnum;
3220 
3221  /*
3222  * Split options into those handled by ALTER SEQUENCE and
3223  * those for ALTER TABLE proper.
3224  */
3225  foreach(lc, castNode(List, cmd->def))
3226  {
3227  DefElem *def = lfirst_node(DefElem, lc);
3228 
3229  if (strcmp(def->defname, "generated") == 0)
3230  newdef = lappend(newdef, def);
3231  else
3232  newseqopts = lappend(newseqopts, def);
3233  }
3234 
3235  attnum = get_attnum(relid, cmd->name);
3236 
3237  if (attnum)
3238  {
3239  Oid seq_relid = getIdentitySequence(relid, attnum, true);
3240 
3241  if (seq_relid)
3242  {
3243  AlterSeqStmt *seqstmt;
3244 
3245  seqstmt = makeNode(AlterSeqStmt);
3246  seqstmt->sequence = makeRangeVar(get_namespace_name(get_rel_namespace(seq_relid)),
3247  get_rel_name(seq_relid), -1);
3248  seqstmt->options = newseqopts;
3249  seqstmt->for_identity = true;
3250  seqstmt->missing_ok = false;
3251 
3252  cxt.alist = lappend(cxt.alist, seqstmt);
3253  }
3254  }
3255 
3256  /*
3257  * If column was not found or was not an identity column,
3258  * we just let the ALTER TABLE command error out later.
3259  */
3260 
3261  cmd->def = (Node *) newdef;
3262  newcmds = lappend(newcmds, cmd);
3263  break;
3264  }
3265 
3266  case AT_AttachPartition:
3267  case AT_DetachPartition:
3268  {
3269  PartitionCmd *partcmd = (PartitionCmd *) cmd->def;
3270 
3271  transformPartitionCmd(&cxt, partcmd);
3272  /* assign transformed value of the partition bound */
3273  partcmd->bound = cxt.partbound;
3274  }
3275 
3276  newcmds = lappend(newcmds, cmd);
3277  break;
3278 
3279  default:
3280  newcmds = lappend(newcmds, cmd);
3281  break;
3282  }
3283  }
3284 
3285  /*
3286  * Transfer anything we already have in cxt.alist into save_alist, to keep
3287  * it separate from the output of transformIndexConstraints.
3288  */
3289  save_alist = cxt.alist;
3290  cxt.alist = NIL;
3291 
3292  /* Postprocess constraints */
3293  transformIndexConstraints(&cxt);
3294  transformFKConstraints(&cxt, skipValidation, true);
3295  transformCheckConstraints(&cxt, false);
3296 
3297  /*
3298  * Push any index-creation commands into the ALTER, so that they can be
3299  * scheduled nicely by tablecmds.c. Note that tablecmds.c assumes that
3300  * the IndexStmt attached to an AT_AddIndex or AT_AddIndexConstraint
3301  * subcommand has already been through transformIndexStmt.
3302  */
3303  foreach(l, cxt.alist)
3304  {
3305  Node *istmt = (Node *) lfirst(l);
3306 
3307  /*
3308  * We assume here that cxt.alist contains only IndexStmts and possibly
3309  * ALTER TABLE SET NOT NULL statements generated from primary key
3310  * constraints. We absorb the subcommands of the latter directly.
3311  */
3312  if (IsA(istmt, IndexStmt))
3313  {
3314  IndexStmt *idxstmt = (IndexStmt *) istmt;
3315 
3316  idxstmt = transformIndexStmt(relid, idxstmt, queryString);
3317  newcmd = makeNode(AlterTableCmd);
3318  newcmd->subtype = OidIsValid(idxstmt->indexOid) ? AT_AddIndexConstraint : AT_AddIndex;
3319  newcmd->def = (Node *) idxstmt;
3320  newcmds = lappend(newcmds, newcmd);
3321  }
3322  else if (IsA(istmt, AlterTableStmt))
3323  {
3324  AlterTableStmt *alterstmt = (AlterTableStmt *) istmt;
3325 
3326  newcmds = list_concat(newcmds, alterstmt->cmds);
3327  }
3328  else
3329  elog(ERROR, "unexpected stmt type %d", (int) nodeTag(istmt));
3330  }
3331  cxt.alist = NIL;
3332 
3333  /* Append any CHECK or FK constraints to the commands list */
3334  foreach(l, cxt.ckconstraints)
3335  {
3336  newcmd = makeNode(AlterTableCmd);
3337  newcmd->subtype = AT_AddConstraint;
3338  newcmd->def = (Node *) lfirst(l);
3339  newcmds = lappend(newcmds, newcmd);
3340  }
3341  foreach(l, cxt.fkconstraints)
3342  {
3343  newcmd = makeNode(AlterTableCmd);
3344  newcmd->subtype = AT_AddConstraint;
3345  newcmd->def = (Node *) lfirst(l);
3346  newcmds = lappend(newcmds, newcmd);
3347  }
3348 
3349  /* Append extended statistic objects */
3350  transformExtendedStatistics(&cxt);
3351 
3352  /* Close rel */
3353  relation_close(rel, NoLock);
3354 
3355  /*
3356  * Output results.
3357  */
3358  stmt->cmds = newcmds;
3359 
3360  result = lappend(cxt.blist, stmt);
3361  result = list_concat(result, cxt.alist);
3362  result = list_concat(result, save_alist);
3363 
3364  return result;
3365 }
3366 
3367 
3368 /*
3369  * Preprocess a list of column constraint clauses
3370  * to attach constraint attributes to their primary constraint nodes
3371  * and detect inconsistent/misplaced constraint attributes.
3372  *
3373  * NOTE: currently, attributes are only supported for FOREIGN KEY, UNIQUE,
3374  * EXCLUSION, and PRIMARY KEY constraints, but someday they ought to be
3375  * supported for other constraint types.
3376  */
3377 static void
3378 transformConstraintAttrs(CreateStmtContext *cxt, List *constraintList)
3379 {
3380  Constraint *lastprimarycon = NULL;
3381  bool saw_deferrability = false;
3382  bool saw_initially = false;
3383  ListCell *clist;
3384 
3385 #define SUPPORTS_ATTRS(node) \
3386  ((node) != NULL && \
3387  ((node)->contype == CONSTR_PRIMARY || \
3388  (node)->contype == CONSTR_UNIQUE || \
3389  (node)->contype == CONSTR_EXCLUSION || \
3390  (node)->contype == CONSTR_FOREIGN))
3391 
3392  foreach(clist, constraintList)
3393  {
3394  Constraint *con = (Constraint *) lfirst(clist);
3395 
3396  if (!IsA(con, Constraint))
3397  elog(ERROR, "unrecognized node type: %d",
3398  (int) nodeTag(con));
3399  switch (con->contype)
3400  {
3401  case CONSTR_ATTR_DEFERRABLE:
3402  if (!SUPPORTS_ATTRS(lastprimarycon))
3403  ereport(ERROR,
3404  (errcode(ERRCODE_SYNTAX_ERROR),
3405  errmsg("misplaced DEFERRABLE clause"),
3406  parser_errposition(cxt->pstate, con->location)));
3407  if (saw_deferrability)
3408  ereport(ERROR,
3409  (errcode(ERRCODE_SYNTAX_ERROR),
3410  errmsg("multiple DEFERRABLE/NOT DEFERRABLE clauses not allowed"),
3411  parser_errposition(cxt->pstate, con->location)));
3412  saw_deferrability = true;
3413  lastprimarycon->deferrable = true;
3414  break;
3415 
3416  case CONSTR_ATTR_NOT_DEFERRABLE:
3417  if (!SUPPORTS_ATTRS(lastprimarycon))
3418  ereport(ERROR,
3419  (errcode(ERRCODE_SYNTAX_ERROR),
3420  errmsg("misplaced NOT DEFERRABLE clause"),
3421  parser_errposition(cxt->pstate, con->location)));
3422  if (saw_deferrability)
3423  ereport(ERROR,
3424  (errcode(ERRCODE_SYNTAX_ERROR),
3425  errmsg("multiple DEFERRABLE/NOT DEFERRABLE clauses not allowed"),
3426  parser_errposition(cxt->pstate, con->location)));
3427  saw_deferrability = true;
3428  lastprimarycon->deferrable = false;
3429  if (saw_initially &&
3430  lastprimarycon->initdeferred)
3431  ereport(ERROR,
3432  (errcode(ERRCODE_SYNTAX_ERROR),
3433  errmsg("constraint declared INITIALLY DEFERRED must be DEFERRABLE"),
3434  parser_errposition(cxt->pstate, con->location)));
3435  break;
3436 
3437  case CONSTR_ATTR_DEFERRED:
3438  if (!SUPPORTS_ATTRS(lastprimarycon))
3439  ereport(ERROR,
3440  (errcode(ERRCODE_SYNTAX_ERROR),
3441  errmsg("misplaced INITIALLY DEFERRED clause"),
3442  parser_errposition(cxt->pstate, con->location)));
3443  if (saw_initially)
3444  ereport(ERROR,
3445  (errcode(ERRCODE_SYNTAX_ERROR),
3446  errmsg("multiple INITIALLY IMMEDIATE/DEFERRED clauses not allowed"),
3447  parser_errposition(cxt->pstate, con->location)));
3448  saw_initially = true;
3449  lastprimarycon->initdeferred = true;
3450 
3451  /*
3452  * If only INITIALLY DEFERRED appears, assume DEFERRABLE
3453  */
3454  if (!saw_deferrability)
3455  lastprimarycon->deferrable = true;
3456  else if (!lastprimarycon->deferrable)
3457  ereport(ERROR,
3458  (errcode(ERRCODE_SYNTAX_ERROR),
3459  errmsg("constraint declared INITIALLY DEFERRED must be DEFERRABLE"),
3460  parser_errposition(cxt->pstate, con->location)));
3461  break;
3462 
3463  case CONSTR_ATTR_IMMEDIATE:
3464  if (!SUPPORTS_ATTRS(lastprimarycon))
3465  ereport(ERROR,
3466  (errcode(ERRCODE_SYNTAX_ERROR),
3467  errmsg("misplaced INITIALLY IMMEDIATE clause"),
3468  parser_errposition(cxt->pstate, con->location)));
3469  if (saw_initially)
3470  ereport(ERROR,
3471  (errcode(ERRCODE_SYNTAX_ERROR),
3472  errmsg("multiple INITIALLY IMMEDIATE/DEFERRED clauses not allowed"),
3473  parser_errposition(cxt->pstate, con->location)));
3474  saw_initially = true;
3475  lastprimarycon->initdeferred = false;
3476  break;
3477 
3478  default:
3479  /* Otherwise it's not an attribute */
3480  lastprimarycon = con;
3481  /* reset flags for new primary node */
3482  saw_deferrability = false;
3483  saw_initially = false;
3484  break;
3485  }
3486  }
3487 }
3488 
3489 /*
3490  * Special handling of type definition for a column
3491  */
3492 static void
3493 transformColumnType(CreateStmtContext *cxt, ColumnDef *column)
3494 {
3495  /*
3496  * All we really need to do here is verify that the type is valid,
3497  * including any collation spec that might be present.
3498  */
3499  Type ctype = typenameType(cxt->pstate, column->typeName, NULL);
3500 
3501  if (column->collClause)
3502  {
3503  Form_pg_type typtup = (Form_pg_type) GETSTRUCT(ctype);
3504 
3505  LookupCollation(cxt->pstate,
3506  column->collClause->collname,
3507  column->collClause->location);
3508  /* Complain if COLLATE is applied to an uncollatable type */
3509  if (!OidIsValid(typtup->typcollation))
3510  ereport(ERROR,
3511  (errcode(ERRCODE_DATATYPE_MISMATCH),
3512  errmsg("collations are not supported by type %s",
3513  format_type_be(typtup->oid)),
3514  parser_errposition(cxt->pstate,
3515  column->collClause->location)));
3516  }
3517 
3518  ReleaseSysCache(ctype);
3519 }
3520 
3521 
3522 /*
3523  * transformCreateSchemaStmt -
3524  * analyzes the CREATE SCHEMA statement
3525  *
3526  * Split the schema element list into individual commands and place
3527  * them in the result list in an order such that there are no forward
3528  * references (e.g. GRANT to a table created later in the list). Note
3529  * that the logic we use for determining forward references is
3530  * presently quite incomplete.
3531  *
3532  * SQL also allows constraints to make forward references, so thumb through
3533  * the table columns and move forward references to a posterior alter-table
3534  * command.
3535  *
3536  * The result is a list of parse nodes that still need to be analyzed ---
3537  * but we can't analyze the later commands until we've executed the earlier
3538  * ones, because of possible inter-object references.
3539  *
3540  * Note: this breaks the rules a little bit by modifying schema-name fields
3541  * within passed-in structs. However, the transformation would be the same
3542  * if done over, so it should be all right to scribble on the input to this
3543  * extent.
3544  */
3545 List *
3546 transformCreateSchemaStmt(CreateSchemaStmt *stmt)
3547 {
3548  CreateSchemaStmtContext cxt;
3549  List *result;
3550  ListCell *elements;
3551 
3552  cxt.stmtType = "CREATE SCHEMA";
3553  cxt.schemaname = stmt->schemaname;
3554  cxt.authrole = (RoleSpec *) stmt->authrole;
3555  cxt.sequences = NIL;
3556  cxt.tables = NIL;
3557  cxt.views = NIL;
3558  cxt.indexes = NIL;
3559  cxt.triggers = NIL;
3560  cxt.grants = NIL;
3561 
3562  /*
3563  * Run through each schema element in the schema element list. Separate
3564  * statements by type, and do preliminary analysis.
3565  */
3566  foreach(elements, stmt->schemaElts)
3567  {
3568  Node *element = lfirst(elements);
3569 
3570  switch (nodeTag(element))
3571  {
3572  case T_CreateSeqStmt:
3573  {
3574  CreateSeqStmt *elp = (CreateSeqStmt *) element;
3575 
3576  setSchemaName(cxt.schemaname, &elp->sequence->schemaname);
3577  cxt.sequences = lappend(cxt.sequences, element);
3578  }
3579  break;
3580 
3581  case T_CreateStmt:
3582  {
3583  CreateStmt *elp = (CreateStmt *) element;
3584 
3585  setSchemaName(cxt.schemaname, &elp->relation->schemaname);
3586 
3587  /*
3588  * XXX todo: deal with constraints
3589  */
3590  cxt.tables = lappend(cxt.tables, element);
3591  }
3592  break;
3593 
3594  case T_ViewStmt:
3595  {
3596  ViewStmt *elp = (ViewStmt *) element;
3597 
3598  setSchemaName(cxt.schemaname, &elp->view->schemaname);
3599 
3600  /*
3601  * XXX todo: deal with references between views
3602  */
3603  cxt.views = lappend(cxt.views, element);
3604  }
3605  break;
3606 
3607  case T_IndexStmt:
3608  {
3609  IndexStmt *elp = (IndexStmt *) element;
3610 
3611  setSchemaName(cxt.schemaname, &elp->relation->schemaname);
3612  cxt.indexes = lappend(cxt.indexes, element);
3613  }
3614  break;
3615 
3616  case T_CreateTrigStmt:
3617  {
3618  CreateTrigStmt *elp = (CreateTrigStmt *) element;
3619 
3620  setSchemaName(cxt.schemaname, &elp->relation->schemaname);
3621  cxt.triggers = lappend(cxt.triggers, element);
3622  }
3623  break;
3624 
3625  case T_GrantStmt:
3626  cxt.grants = lappend(cxt.grants, element);
3627  break;
3628 
3629  default:
3630  elog(ERROR, "unrecognized node type: %d",
3631  (int) nodeTag(element));
3632  }
3633  }
3634 
3635  result = NIL;
3636  result = list_concat(result, cxt.sequences);
3637  result = list_concat(result, cxt.tables);
3638  result = list_concat(result, cxt.views);
3639  result = list_concat(result, cxt.indexes);
3640  result = list_concat(result, cxt.triggers);
3641  result = list_concat(result, cxt.grants);
3642 
3643  return result;
3644 }
3645 
3646 /*
3647  * setSchemaName
3648  * Set or check schema name in an element of a CREATE SCHEMA command
3649  */
3650 static void
3651 setSchemaName(char *context_schema, char **stmt_schema_name)
3652 {
3653  if (*stmt_schema_name == NULL)
3654  *stmt_schema_name = context_schema;
3655  else if (strcmp(context_schema, *stmt_schema_name) != 0)
3656  ereport(ERROR,
3657  (errcode(ERRCODE_INVALID_SCHEMA_DEFINITION),
3658  errmsg("CREATE specifies a schema (%s) "
3659  "different from the one being created (%s)",
3660  *stmt_schema_name, context_schema)));
3661 }
3662 
3663 /*
3664  * transformPartitionCmd
3665  * Analyze the ATTACH/DETACH PARTITION command
3666  *
3667  * In case of the ATTACH PARTITION command, cxt->partbound is set to the
3668  * transformed value of cmd->bound.
3669  */
3670 static void
3671 transformPartitionCmd(CreateStmtContext *cxt, PartitionCmd *cmd)
3672 {
3673  Relation parentRel = cxt->rel;
3674 
3675  switch (parentRel->rd_rel->relkind)
3676  {
3677  case RELKIND_PARTITIONED_TABLE:
3678  /* transform the partition bound, if any */
3679  Assert(RelationGetPartitionKey(parentRel) != NULL);
3680  if (cmd->bound != NULL)
3681  cxt->partbound = transformPartitionBound(cxt->pstate, parentRel,
3682  cmd->bound);
3683  break;
3684  case RELKIND_PARTITIONED_INDEX:
3685  /* nothing to check */
3686  Assert(cmd->bound == NULL);
3687  break;
3688  case RELKIND_RELATION:
3689  /* the table must be partitioned */
3690  ereport(ERROR,
3691  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
3692  errmsg("table \"%s\" is not partitioned",
3693  RelationGetRelationName(parentRel))));
3694  break;
3695  case RELKIND_INDEX:
3696  /* the index must be partitioned */
3697  ereport(ERROR,
3698  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
3699  errmsg("index \"%s\" is not partitioned",
3700  RelationGetRelationName(parentRel))));
3701  break;
3702  default:
3703  /* parser shouldn't let this case through */
3704  elog(ERROR, "\"%s\" is not a partitioned table or index",
3705  RelationGetRelationName(parentRel));
3706  break;
3707  }
3708 }
3709 
3710 /*
3711  * transformPartitionBound
3712  *
3713  * Transform a partition bound specification
3714  */
3715 PartitionBoundSpec *
3716 transformPartitionBound(ParseState *pstate, Relation parent,
3717  PartitionBoundSpec *spec)
3718 {
3719  PartitionBoundSpec *result_spec;
3720  PartitionKey key = RelationGetPartitionKey(parent);
3721  char strategy = get_partition_strategy(key);
3722  int partnatts = get_partition_natts(key);
3723  List *partexprs = get_partition_exprs(key);
3724 
3725  /* Avoid scribbling on input */
3726  result_spec = copyObject(spec);
3727 
3728  if (spec->is_default)
3729  {
3730  /*
3731  * Hash partitioning does not support a default partition; there's no
3732  * use case for it (since the set of partitions to create is perfectly
3733  * defined), and if users do get into it accidentally, it's hard to
3734  * back out from it afterwards.
3735  */
3736  if (strategy == PARTITION_STRATEGY_HASH)
3737  ereport(ERROR,
3738  (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
3739  errmsg("a hash-partitioned table may not have a default partition")));
3740 
3741  /*
3742  * In case of the default partition, parser had no way to identify the
3743  * partition strategy. Assign the parent's strategy to the default
3744  * partition bound spec.
3745  */
3746  result_spec->strategy = strategy;
3747 
3748  return result_spec;
3749  }
3750 
3751  if (strategy == PARTITION_STRATEGY_HASH)
3752  {
3753  if (spec->strategy != PARTITION_STRATEGY_HASH)
3754  ereport(ERROR,
3755  (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
3756  errmsg("invalid bound specification for a hash partition"),
3757  parser_errposition(pstate, exprLocation((Node *) spec))));
3758 
3759  if (spec->modulus <= 0)
3760  ereport(ERROR,
3761  (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
3762  errmsg("modulus for hash partition must be a positive integer")));
3763 
3764  Assert(spec->remainder >= 0);
3765 
3766  if (spec->remainder >= spec->modulus)
3767  ereport(ERROR,
3768  (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
3769  errmsg("remainder for hash partition must be less than modulus")));
3770  }
3771  else if (strategy == PARTITION_STRATEGY_LIST)
3772  {
3773  ListCell *cell;
3774  char *colname;
3775  Oid coltype;
3776  int32 coltypmod;
3777  Oid partcollation;
3778 
3779  if (spec->strategy != PARTITION_STRATEGY_LIST)
3780  ereport(ERROR,
3781  (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
3782  errmsg("invalid bound specification for a list partition"),
3783  parser_errposition(pstate, exprLocation((Node *) spec))));
3784 
3785  /* Get the only column's name in case we need to output an error */
3786  if (key->partattrs[0] != 0)
3787  colname = get_attname(RelationGetRelid(parent),
3788  key->partattrs[0], false);
3789  else
3790  colname = deparse_expression((Node *) linitial(partexprs),
3791  deparse_context_for(RelationGetRelationName(parent),
3792  RelationGetRelid(parent)),
3793  false, false);
3794  /* Need its type data too */
3795  coltype = get_partition_col_typid(key, 0);
3796  coltypmod = get_partition_col_typmod(key, 0);
3797  partcollation = get_partition_col_collation(key, 0);
3798 
3799  result_spec->listdatums = NIL;
3800  foreach(cell, spec->listdatums)
3801  {
3802  Node *expr = lfirst(cell);
3803  Const *value;
3804  ListCell *cell2;
3805  bool duplicate;
3806 
3807  value = transformPartitionBoundValue(pstate, expr,
3808  colname, coltype, coltypmod,
3809  partcollation);
3810 
3811  /* Don't add to the result if the value is a duplicate */
3812  duplicate = false;
3813  foreach(cell2, result_spec->listdatums)
3814  {
3815  Const *value2 = castNode(Const, lfirst(cell2));
3816 
3817  if (equal(value, value2))
3818  {
3819  duplicate = true;
3820  break;
3821  }
3822  }
3823  if (duplicate)
3824  continue;
3825 
3826  result_spec->listdatums = lappend(result_spec->listdatums,
3827  value);
3828  }
3829  }
3830  else if (strategy == PARTITION_STRATEGY_RANGE)
3831  {
3832  if (spec->strategy != PARTITION_STRATEGY_RANGE)
3833  ereport(ERROR,
3834  (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
3835  errmsg("invalid bound specification for a range partition"),
3836  parser_errposition(pstate, exprLocation((Node *) spec))));
3837 
3838  if (list_length(spec->lowerdatums) != partnatts)
3839  ereport(ERROR,
3840  (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
3841  errmsg("FROM must specify exactly one value per partitioning column")));
3842  if (list_length(spec->upperdatums) != partnatts)
3843  ereport(ERROR,
3844  (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
3845  errmsg("TO must specify exactly one value per partitioning column")));
3846 
3847  /*
3848  * Convert raw parse nodes into PartitionRangeDatum nodes and perform
3849  * any necessary validation.
3850  */
3851  result_spec->lowerdatums =
3852  transformPartitionRangeBounds(pstate, spec->lowerdatums,
3853  parent);
3854  result_spec->upperdatums =
3855  transformPartitionRangeBounds(pstate, spec->upperdatums,
3856  parent);
3857  }
3858  else
3859  elog(ERROR, "unexpected partition strategy: %d", (int) strategy);
3860 
3861  return result_spec;
3862 }
3863 
3864 /*
3865  * transformPartitionRangeBounds
3866  * This converts the expressions for range partition bounds from the raw
3867  * grammar representation to PartitionRangeDatum structs
3868  */
3869 static List *
3870 transformPartitionRangeBounds(ParseState *pstate, List *blist,
3871  Relation parent)
3872 {
3873  List *result = NIL;
3874  PartitionKey key = RelationGetPartitionKey(parent);
3875  List *partexprs = get_partition_exprs(key);
3876  ListCell *lc;
3877  int i,
3878  j;
3879 
3880  i = j = 0;
3881  foreach(lc, blist)
3882  {
3883  Node *expr = lfirst(lc);
3884  PartitionRangeDatum *prd = NULL;
3885 
3886  /*
3887  * Infinite range bounds -- "minvalue" and "maxvalue" -- get passed in
3888  * as ColumnRefs.
3889  */
3890  if (IsA(expr, ColumnRef))
3891  {
3892  ColumnRef *cref = (ColumnRef *) expr;
3893  char *cname = NULL;
3894 
3895  /*
3896  * There should be a single field named either "minvalue" or
3897  * "maxvalue".
3898  */
3899  if (list_length(cref->fields) == 1 &&
3900  IsA(linitial(cref->fields), String))
3901  cname = strVal(linitial(cref->fields));
3902 
3903  if (cname == NULL)
3904  {
3905  /*
3906  * ColumnRef is not in the desired single-field-name form. For
3907  * consistency between all partition strategies, let the
3908  * expression transformation report any errors rather than
3909  * doing it ourselves.
3910  */
3911  }
3912  else if (strcmp("minvalue", cname) == 0)
3913  {
3914  prd = makeNode(PartitionRangeDatum);
3915  prd->kind = PARTITION_RANGE_DATUM_MINVALUE;
3916  prd->value = NULL;
3917  }
3918  else if (strcmp("maxvalue", cname) == 0)
3919  {
3920  prd = makeNode(PartitionRangeDatum);
3921  prd->kind = PARTITION_RANGE_DATUM_MAXVALUE;
3922  prd->value = NULL;
3923  }
3924  }
3925 
3926  if (prd == NULL)
3927  {
3928  char *colname;
3929  Oid coltype;
3930  int32 coltypmod;
3931  Oid partcollation;
3932  Const *value;
3933 
3934  /* Get the column's name in case we need to output an error */
3935  if (key->partattrs[i] != 0)
3936  colname = get_attname(RelationGetRelid(parent),
3937  key->partattrs[i], false);
3938  else
3939  {
3940  colname = deparse_expression((Node *) list_nth(partexprs, j),
3941  deparse_context_for(RelationGetRelationName(parent),
3942  RelationGetRelid(parent)),
3943  false, false);
3944  ++j;
3945  }
3946 
3947  /* Need its type data too */
3948  coltype = get_partition_col_typid(key, i);
3949  coltypmod = get_partition_col_typmod(key, i);
3950  partcollation = get_partition_col_collation(key, i);
3951 
3952  value = transformPartitionBoundValue(pstate, expr,
3953  colname,
3954  coltype, coltypmod,
3955  partcollation);
3956  if (value->constisnull)
3957  ereport(ERROR,
3958  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
3959  errmsg("cannot specify NULL in range bound")));
3960  prd = makeNode(PartitionRangeDatum);
3961  prd->kind = PARTITION_RANGE_DATUM_VALUE;
3962  prd->value = (Node *) value;
3963  ++i;
3964  }
3965 
3966  prd->location = exprLocation(expr);
3967 
3968  result = lappend(result, prd);
3969  }
3970 
3971  /*
3972  * Once we see MINVALUE or MAXVALUE for one column, the remaining columns
3973  * must be the same.
3974  */
3975  validateInfiniteBounds(pstate, result);
3976 
3977  return result;
3978 }
3979 
3980 /*
3981  * validateInfiniteBounds
3982  *
3983  * Check that a MAXVALUE or MINVALUE specification in a partition bound is
3984  * followed only by more of the same.
3985  */
3986 static void
3987 validateInfiniteBounds(ParseState *pstate, List *blist)
3988 {
3989  ListCell *lc;
3990  PartitionRangeDatumKind kind = PARTITION_RANGE_DATUM_VALUE;
3991 
3992  foreach(lc, blist)
3993  {
3994  PartitionRangeDatum *prd = castNode(PartitionRangeDatum, lfirst(lc));
3995 
3996  if (kind == prd->kind)
3997  continue;
3998 
3999  switch (kind)
4000  {
4001  case PARTITION_RANGE_DATUM_VALUE:
4002  kind = prd->kind;
4003  break;
4004 
4005  case PARTITION_RANGE_DATUM_MAXVALUE:
4006  ereport(ERROR,
4007  (errcode(ERRCODE_DATATYPE_MISMATCH),
4008  errmsg("every bound following MAXVALUE must also be MAXVALUE"),
4009  parser_errposition(pstate, exprLocation((Node *) prd))));
4010  break;
4011 
4012  case PARTITION_RANGE_DATUM_MINVALUE:
4013  ereport(ERROR,
4014  (errcode(ERRCODE_DATATYPE_MISMATCH),
4015  errmsg("every bound following MINVALUE must also be MINVALUE"),
4016  parser_errposition(pstate, exprLocation((Node *) prd))));
4017  break;
4018  }
4019  }
4020 }
4021 
4022 /*
4023  * Transform one constant in a partition bound spec
4024  */
4025 static Const *
4026 transformPartitionBoundValue(ParseState *pstate, Node *val,
4027  const char *colName, Oid colType, int32 colTypmod,
4028  Oid partCollation)
4029 {
4030  Node *value;
4031 
4032  /* Transform raw parsetree */
4033  value = transformExpr(pstate, val, EXPR_KIND_PARTITION_BOUND);
4034 
4035  /*
4036  * Check that the input expression's collation is compatible with one
4037  * specified for the parent's partition key (partcollation). Don't throw
4038  * an error if it's the default collation which we'll replace with the
4039  * parent's collation anyway.
4040  */
4041  if (IsA(value, CollateExpr))
4042  {
4043  Oid exprCollOid = exprCollation(value);
4044 
4045  if (OidIsValid(exprCollOid) &&
4046  exprCollOid != DEFAULT_COLLATION_OID &&
4047  exprCollOid != partCollation)
4048  ereport(ERROR,
4049  (errcode(ERRCODE_DATATYPE_MISMATCH),
4050  errmsg("collation of partition bound value for column \"%s\" does not match partition key collation \"%s\"",
4051  colName, get_collation_name(partCollation)),
4052  parser_errposition(pstate, exprLocation(value))));
4053  }
4054 
4055  /* Coerce to correct type */
4056  value = coerce_to_target_type(pstate,
4057  value, exprType(value),
4058  colType,
4059  colTypmod,
4060  COERCION_ASSIGNMENT,
4061  COERCE_IMPLICIT_CAST,
4062  -1);
4063 
4064  if (value == NULL)
4065  ereport(ERROR,
4066  (errcode(ERRCODE_DATATYPE_MISMATCH),
4067  errmsg("specified value cannot be cast to type %s for column \"%s\"",
4068  format_type_be(colType), colName),
4069  parser_errposition(pstate, exprLocation(val))));
4070 
4071  /* Simplify the expression, in case we had a coercion */
4072  if (!IsA(value, Const))
4073  value = (Node *) expression_planner((Expr *) value);
4074 
4075  /*
4076  * transformExpr() should have already rejected column references,
4077  * subqueries, aggregates, window functions, and SRFs, based on the
4078  * EXPR_KIND_ for a default expression.
4079  */
4080  Assert(!contain_var_clause(value));
4081 
4082  /*
4083  * Evaluate the expression, assigning the partition key's collation to the
4084  * resulting Const expression.
4085  */
4086  value = (Node *) evaluate_expr((Expr *) value, colType, colTypmod,
4087  partCollation);
4088  if (!IsA(value, Const))
4089  elog(ERROR, "could not evaluate partition bound expression");
4090 
4091  return (Const *) value;
4092 }
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