granicus.if.org Git - postgresql/blob - src/backend/commands/typecmds.c

   1 /*-------------------------------------------------------------------------
   2  *
   3  * typecmds.c
   4  *        Routines for SQL commands that manipulate types (and domains).
   5  *
   6  * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
   7  * Portions Copyright (c) 1994, Regents of the University of California
   8  *
   9  *
  10  * IDENTIFICATION
  11  *        src/backend/commands/typecmds.c
  12  *
  13  * DESCRIPTION
  14  *        The "DefineFoo" routines take the parse tree and pick out the
  15  *        appropriate arguments/flags, passing the results to the
  16  *        corresponding "FooDefine" routines (in src/catalog) that do
  17  *        the actual catalog-munging.  These routines also verify permission
  18  *        of the user to execute the command.
  19  *
  20  * NOTES
  21  *        These things must be defined and committed in the following order:
  22  *              "create function":
  23  *                              input/output, recv/send functions
  24  *              "create type":
  25  *                              type
  26  *              "create operator":
  27  *                              operators
  28  *
  29  *
  30  *-------------------------------------------------------------------------
  31  */
  32 #include "postgres.h"
  33
  34 #include "access/genam.h"
  35 #include "access/heapam.h"
  36 #include "access/xact.h"
  37 #include "catalog/catalog.h"
  38 #include "catalog/dependency.h"
  39 #include "catalog/heap.h"
  40 #include "catalog/indexing.h"
  41 #include "catalog/pg_authid.h"
  42 #include "catalog/pg_collation.h"
  43 #include "catalog/pg_constraint.h"
  44 #include "catalog/pg_depend.h"
  45 #include "catalog/pg_enum.h"
  46 #include "catalog/pg_language.h"
  47 #include "catalog/pg_namespace.h"
  48 #include "catalog/pg_proc.h"
  49 #include "catalog/pg_proc_fn.h"
  50 #include "catalog/pg_range.h"
  51 #include "catalog/pg_type.h"
  52 #include "catalog/pg_type_fn.h"
  53 #include "commands/defrem.h"
  54 #include "commands/tablecmds.h"
  55 #include "commands/typecmds.h"
  56 #include "executor/executor.h"
  57 #include "miscadmin.h"
  58 #include "nodes/makefuncs.h"
  59 #include "optimizer/planner.h"
  60 #include "optimizer/var.h"
  61 #include "parser/parse_coerce.h"
  62 #include "parser/parse_collate.h"
  63 #include "parser/parse_expr.h"
  64 #include "parser/parse_func.h"
  65 #include "parser/parse_type.h"
  66 #include "utils/acl.h"
  67 #include "utils/builtins.h"
  68 #include "utils/fmgroids.h"
  69 #include "utils/lsyscache.h"
  70 #include "utils/memutils.h"
  71 #include "utils/rel.h"
  72 #include "utils/syscache.h"
  73 #include "utils/tqual.h"
  74
  75
  76 /* result structure for get_rels_with_domain() */
  77 typedef struct
  78 {
  79         Relation        rel;                    /* opened and locked relation */
  80         int                     natts;                  /* number of attributes of interest */
  81         int                *atts;                       /* attribute numbers */
  82         /* atts[] is of allocated length RelationGetNumberOfAttributes(rel) */
  83 } RelToCheck;
  84
  85 /* Potentially set by contrib/pg_upgrade_support functions */
  86 Oid                     binary_upgrade_next_array_pg_type_oid = InvalidOid;
  87
  88 static void makeRangeConstructors(const char *name, Oid namespace,
  89                                           Oid rangeOid, Oid subtype);
  90 static Oid      findTypeInputFunction(List *procname, Oid typeOid);
  91 static Oid      findTypeOutputFunction(List *procname, Oid typeOid);
  92 static Oid      findTypeReceiveFunction(List *procname, Oid typeOid);
  93 static Oid      findTypeSendFunction(List *procname, Oid typeOid);
  94 static Oid      findTypeTypmodinFunction(List *procname);
  95 static Oid      findTypeTypmodoutFunction(List *procname);
  96 static Oid      findTypeAnalyzeFunction(List *procname, Oid typeOid);
  97 static Oid      findRangeSubOpclass(List *opcname, Oid subtype);
  98 static Oid      findRangeCanonicalFunction(List *procname, Oid typeOid);
  99 static Oid      findRangeSubtypeDiffFunction(List *procname, Oid subtype);
 100 static void validateDomainConstraint(Oid domainoid, char *ccbin);
 101 static List *get_rels_with_domain(Oid domainOid, LOCKMODE lockmode);
 102 static void checkEnumOwner(HeapTuple tup);
 103 static char *domainAddConstraint(Oid domainOid, Oid domainNamespace,
 104                                         Oid baseTypeOid,
 105                                         int typMod, Constraint *constr,
 106                                         char *domainName);
 107
 108
 109 /*
 110  * DefineType
 111  *              Registers a new base type.
 112  */
 113 void
 114 DefineType(List *names, List *parameters)
 115 {
 116         char       *typeName;
 117         Oid                     typeNamespace;
 118         int16           internalLength = -1;    /* default: variable-length */
 119         List       *inputName = NIL;
 120         List       *outputName = NIL;
 121         List       *receiveName = NIL;
 122         List       *sendName = NIL;
 123         List       *typmodinName = NIL;
 124         List       *typmodoutName = NIL;
 125         List       *analyzeName = NIL;
 126         char            category = TYPCATEGORY_USER;
 127         bool            preferred = false;
 128         char            delimiter = DEFAULT_TYPDELIM;
 129         Oid                     elemType = InvalidOid;
 130         char       *defaultValue = NULL;
 131         bool            byValue = false;
 132         char            alignment = 'i';        /* default alignment */
 133         char            storage = 'p';  /* default TOAST storage method */
 134         Oid                     collation = InvalidOid;
 135         DefElem    *likeTypeEl = NULL;
 136         DefElem    *internalLengthEl = NULL;
 137         DefElem    *inputNameEl = NULL;
 138         DefElem    *outputNameEl = NULL;
 139         DefElem    *receiveNameEl = NULL;
 140         DefElem    *sendNameEl = NULL;
 141         DefElem    *typmodinNameEl = NULL;
 142         DefElem    *typmodoutNameEl = NULL;
 143         DefElem    *analyzeNameEl = NULL;
 144         DefElem    *categoryEl = NULL;
 145         DefElem    *preferredEl = NULL;
 146         DefElem    *delimiterEl = NULL;
 147         DefElem    *elemTypeEl = NULL;
 148         DefElem    *defaultValueEl = NULL;
 149         DefElem    *byValueEl = NULL;
 150         DefElem    *alignmentEl = NULL;
 151         DefElem    *storageEl = NULL;
 152         DefElem    *collatableEl = NULL;
 153         Oid                     inputOid;
 154         Oid                     outputOid;
 155         Oid                     receiveOid = InvalidOid;
 156         Oid                     sendOid = InvalidOid;
 157         Oid                     typmodinOid = InvalidOid;
 158         Oid                     typmodoutOid = InvalidOid;
 159         Oid                     analyzeOid = InvalidOid;
 160         char       *array_type;
 161         Oid                     array_oid;
 162         Oid                     typoid;
 163         Oid                     resulttype;
 164         ListCell   *pl;
 165
 166         /*
 167          * As of Postgres 8.4, we require superuser privilege to create a base
 168          * type.  This is simple paranoia: there are too many ways to mess up the
 169          * system with an incorrect type definition (for instance, representation
 170          * parameters that don't match what the C code expects).  In practice it
 171          * takes superuser privilege to create the I/O functions, and so the
 172          * former requirement that you own the I/O functions pretty much forced
 173          * superuserness anyway.  We're just making doubly sure here.
 174          *
 175          * XXX re-enable NOT_USED code sections below if you remove this test.
 176          */
 177         if (!superuser())
 178                 ereport(ERROR,
 179                                 (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
 180                                  errmsg("must be superuser to create a base type")));
 181
 182         /* Convert list of names to a name and namespace */
 183         typeNamespace = QualifiedNameGetCreationNamespace(names, &typeName);
 184
 185 #ifdef NOT_USED
 186         /* XXX this is unnecessary given the superuser check above */
 187         /* Check we have creation rights in target namespace */
 188         aclresult = pg_namespace_aclcheck(typeNamespace, GetUserId(), ACL_CREATE);
 189         if (aclresult != ACLCHECK_OK)
 190                 aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
 191                                            get_namespace_name(typeNamespace));
 192 #endif
 193
 194         /*
 195          * Look to see if type already exists (presumably as a shell; if not,
 196          * TypeCreate will complain).
 197          */
 198         typoid = GetSysCacheOid2(TYPENAMENSP,
 199                                                          CStringGetDatum(typeName),
 200                                                          ObjectIdGetDatum(typeNamespace));
 201
 202         /*
 203          * If it's not a shell, see if it's an autogenerated array type, and if so
 204          * rename it out of the way.
 205          */
 206         if (OidIsValid(typoid) && get_typisdefined(typoid))
 207         {
 208                 if (moveArrayTypeName(typoid, typeName, typeNamespace))
 209                         typoid = InvalidOid;
 210         }
 211
 212         /*
 213          * If it doesn't exist, create it as a shell, so that the OID is known for
 214          * use in the I/O function definitions.
 215          */
 216         if (!OidIsValid(typoid))
 217         {
 218                 typoid = TypeShellMake(typeName, typeNamespace, GetUserId());
 219                 /* Make new shell type visible for modification below */
 220                 CommandCounterIncrement();
 221
 222                 /*
 223                  * If the command was a parameterless CREATE TYPE, we're done ---
 224                  * creating the shell type was all we're supposed to do.
 225                  */
 226                 if (parameters == NIL)
 227                         return;
 228         }
 229         else
 230         {
 231                 /* Complain if dummy CREATE TYPE and entry already exists */
 232                 if (parameters == NIL)
 233                         ereport(ERROR,
 234                                         (errcode(ERRCODE_DUPLICATE_OBJECT),
 235                                          errmsg("type \"%s\" already exists", typeName)));
 236         }
 237
 238         /* Extract the parameters from the parameter list */
 239         foreach(pl, parameters)
 240         {
 241                 DefElem    *defel = (DefElem *) lfirst(pl);
 242                 DefElem   **defelp;
 243
 244                 if (pg_strcasecmp(defel->defname, "like") == 0)
 245                         defelp = &likeTypeEl;
 246                 else if (pg_strcasecmp(defel->defname, "internallength") == 0)
 247                         defelp = &internalLengthEl;
 248                 else if (pg_strcasecmp(defel->defname, "input") == 0)
 249                         defelp = &inputNameEl;
 250                 else if (pg_strcasecmp(defel->defname, "output") == 0)
 251                         defelp = &outputNameEl;
 252                 else if (pg_strcasecmp(defel->defname, "receive") == 0)
 253                         defelp = &receiveNameEl;
 254                 else if (pg_strcasecmp(defel->defname, "send") == 0)
 255                         defelp = &sendNameEl;
 256                 else if (pg_strcasecmp(defel->defname, "typmod_in") == 0)
 257                         defelp = &typmodinNameEl;
 258                 else if (pg_strcasecmp(defel->defname, "typmod_out") == 0)
 259                         defelp = &typmodoutNameEl;
 260                 else if (pg_strcasecmp(defel->defname, "analyze") == 0 ||
 261                                  pg_strcasecmp(defel->defname, "analyse") == 0)
 262                         defelp = &analyzeNameEl;
 263                 else if (pg_strcasecmp(defel->defname, "category") == 0)
 264                         defelp = &categoryEl;
 265                 else if (pg_strcasecmp(defel->defname, "preferred") == 0)
 266                         defelp = &preferredEl;
 267                 else if (pg_strcasecmp(defel->defname, "delimiter") == 0)
 268                         defelp = &delimiterEl;
 269                 else if (pg_strcasecmp(defel->defname, "element") == 0)
 270                         defelp = &elemTypeEl;
 271                 else if (pg_strcasecmp(defel->defname, "default") == 0)
 272                         defelp = &defaultValueEl;
 273                 else if (pg_strcasecmp(defel->defname, "passedbyvalue") == 0)
 274                         defelp = &byValueEl;
 275                 else if (pg_strcasecmp(defel->defname, "alignment") == 0)
 276                         defelp = &alignmentEl;
 277                 else if (pg_strcasecmp(defel->defname, "storage") == 0)
 278                         defelp = &storageEl;
 279                 else if (pg_strcasecmp(defel->defname, "collatable") == 0)
 280                         defelp = &collatableEl;
 281                 else
 282                 {
 283                         /* WARNING, not ERROR, for historical backwards-compatibility */
 284                         ereport(WARNING,
 285                                         (errcode(ERRCODE_SYNTAX_ERROR),
 286                                          errmsg("type attribute \"%s\" not recognized",
 287                                                         defel->defname)));
 288                         continue;
 289                 }
 290                 if (*defelp != NULL)
 291                         ereport(ERROR,
 292                                         (errcode(ERRCODE_SYNTAX_ERROR),
 293                                          errmsg("conflicting or redundant options")));
 294                 *defelp = defel;
 295         }
 296
 297         /*
 298          * Now interpret the options; we do this separately so that LIKE can be
 299          * overridden by other options regardless of the ordering in the parameter
 300          * list.
 301          */
 302         if (likeTypeEl)
 303         {
 304                 Type            likeType;
 305                 Form_pg_type likeForm;
 306
 307                 likeType = typenameType(NULL, defGetTypeName(likeTypeEl), NULL);
 308                 likeForm = (Form_pg_type) GETSTRUCT(likeType);
 309                 internalLength = likeForm->typlen;
 310                 byValue = likeForm->typbyval;
 311                 alignment = likeForm->typalign;
 312                 storage = likeForm->typstorage;
 313                 ReleaseSysCache(likeType);
 314         }
 315         if (internalLengthEl)
 316                 internalLength = defGetTypeLength(internalLengthEl);
 317         if (inputNameEl)
 318                 inputName = defGetQualifiedName(inputNameEl);
 319         if (outputNameEl)
 320                 outputName = defGetQualifiedName(outputNameEl);
 321         if (receiveNameEl)
 322                 receiveName = defGetQualifiedName(receiveNameEl);
 323         if (sendNameEl)
 324                 sendName = defGetQualifiedName(sendNameEl);
 325         if (typmodinNameEl)
 326                 typmodinName = defGetQualifiedName(typmodinNameEl);
 327         if (typmodoutNameEl)
 328                 typmodoutName = defGetQualifiedName(typmodoutNameEl);
 329         if (analyzeNameEl)
 330                 analyzeName = defGetQualifiedName(analyzeNameEl);
 331         if (categoryEl)
 332         {
 333                 char       *p = defGetString(categoryEl);
 334
 335                 category = p[0];
 336                 /* restrict to non-control ASCII */
 337                 if (category < 32 || category > 126)
 338                         ereport(ERROR,
 339                                         (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
 340                                  errmsg("invalid type category \"%s\": must be simple ASCII",
 341                                                 p)));
 342         }
 343         if (preferredEl)
 344                 preferred = defGetBoolean(preferredEl);
 345         if (delimiterEl)
 346         {
 347                 char       *p = defGetString(delimiterEl);
 348
 349                 delimiter = p[0];
 350                 /* XXX shouldn't we restrict the delimiter? */
 351         }
 352         if (elemTypeEl)
 353         {
 354                 elemType = typenameTypeId(NULL, defGetTypeName(elemTypeEl));
 355                 /* disallow arrays of pseudotypes */
 356                 if (get_typtype(elemType) == TYPTYPE_PSEUDO)
 357                         ereport(ERROR,
 358                                         (errcode(ERRCODE_DATATYPE_MISMATCH),
 359                                          errmsg("array element type cannot be %s",
 360                                                         format_type_be(elemType))));
 361         }
 362         if (defaultValueEl)
 363                 defaultValue = defGetString(defaultValueEl);
 364         if (byValueEl)
 365                 byValue = defGetBoolean(byValueEl);
 366         if (alignmentEl)
 367         {
 368                 char       *a = defGetString(alignmentEl);
 369
 370                 /*
 371                  * Note: if argument was an unquoted identifier, parser will have
 372                  * applied translations to it, so be prepared to recognize translated
 373                  * type names as well as the nominal form.
 374                  */
 375                 if (pg_strcasecmp(a, "double") == 0 ||
 376                         pg_strcasecmp(a, "float8") == 0 ||
 377                         pg_strcasecmp(a, "pg_catalog.float8") == 0)
 378                         alignment = 'd';
 379                 else if (pg_strcasecmp(a, "int4") == 0 ||
 380                                  pg_strcasecmp(a, "pg_catalog.int4") == 0)
 381                         alignment = 'i';
 382                 else if (pg_strcasecmp(a, "int2") == 0 ||
 383                                  pg_strcasecmp(a, "pg_catalog.int2") == 0)
 384                         alignment = 's';
 385                 else if (pg_strcasecmp(a, "char") == 0 ||
 386                                  pg_strcasecmp(a, "pg_catalog.bpchar") == 0)
 387                         alignment = 'c';
 388                 else
 389                         ereport(ERROR,
 390                                         (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
 391                                          errmsg("alignment \"%s\" not recognized", a)));
 392         }
 393         if (storageEl)
 394         {
 395                 char       *a = defGetString(storageEl);
 396
 397                 if (pg_strcasecmp(a, "plain") == 0)
 398                         storage = 'p';
 399                 else if (pg_strcasecmp(a, "external") == 0)
 400                         storage = 'e';
 401                 else if (pg_strcasecmp(a, "extended") == 0)
 402                         storage = 'x';
 403                 else if (pg_strcasecmp(a, "main") == 0)
 404                         storage = 'm';
 405                 else
 406                         ereport(ERROR,
 407                                         (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
 408                                          errmsg("storage \"%s\" not recognized", a)));
 409         }
 410         if (collatableEl)
 411                 collation = defGetBoolean(collatableEl) ? DEFAULT_COLLATION_OID : InvalidOid;
 412
 413         /*
 414          * make sure we have our required definitions
 415          */
 416         if (inputName == NIL)
 417                 ereport(ERROR,
 418                                 (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
 419                                  errmsg("type input function must be specified")));
 420         if (outputName == NIL)
 421                 ereport(ERROR,
 422                                 (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
 423                                  errmsg("type output function must be specified")));
 424
 425         if (typmodinName == NIL && typmodoutName != NIL)
 426                 ereport(ERROR,
 427                                 (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
 428                                  errmsg("type modifier output function is useless without a type modifier input function")));
 429
 430         /*
 431          * Convert I/O proc names to OIDs
 432          */
 433         inputOid = findTypeInputFunction(inputName, typoid);
 434         outputOid = findTypeOutputFunction(outputName, typoid);
 435         if (receiveName)
 436                 receiveOid = findTypeReceiveFunction(receiveName, typoid);
 437         if (sendName)
 438                 sendOid = findTypeSendFunction(sendName, typoid);
 439
 440         /*
 441          * Verify that I/O procs return the expected thing.  If we see OPAQUE,
 442          * complain and change it to the correct type-safe choice.
 443          */
 444         resulttype = get_func_rettype(inputOid);
 445         if (resulttype != typoid)
 446         {
 447                 if (resulttype == OPAQUEOID)
 448                 {
 449                         /* backwards-compatibility hack */
 450                         ereport(WARNING,
 451                                         (errmsg("changing return type of function %s from \"opaque\" to %s",
 452                                                         NameListToString(inputName), typeName)));
 453                         SetFunctionReturnType(inputOid, typoid);
 454                 }
 455                 else
 456                         ereport(ERROR,
 457                                         (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
 458                                          errmsg("type input function %s must return type %s",
 459                                                         NameListToString(inputName), typeName)));
 460         }
 461         resulttype = get_func_rettype(outputOid);
 462         if (resulttype != CSTRINGOID)
 463         {
 464                 if (resulttype == OPAQUEOID)
 465                 {
 466                         /* backwards-compatibility hack */
 467                         ereport(WARNING,
 468                                         (errmsg("changing return type of function %s from \"opaque\" to \"cstring\"",
 469                                                         NameListToString(outputName))));
 470                         SetFunctionReturnType(outputOid, CSTRINGOID);
 471                 }
 472                 else
 473                         ereport(ERROR,
 474                                         (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
 475                            errmsg("type output function %s must return type \"cstring\"",
 476                                           NameListToString(outputName))));
 477         }
 478         if (receiveOid)
 479         {
 480                 resulttype = get_func_rettype(receiveOid);
 481                 if (resulttype != typoid)
 482                         ereport(ERROR,
 483                                         (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
 484                                          errmsg("type receive function %s must return type %s",
 485                                                         NameListToString(receiveName), typeName)));
 486         }
 487         if (sendOid)
 488         {
 489                 resulttype = get_func_rettype(sendOid);
 490                 if (resulttype != BYTEAOID)
 491                         ereport(ERROR,
 492                                         (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
 493                                    errmsg("type send function %s must return type \"bytea\"",
 494                                                   NameListToString(sendName))));
 495         }
 496
 497         /*
 498          * Convert typmodin/out function proc names to OIDs.
 499          */
 500         if (typmodinName)
 501                 typmodinOid = findTypeTypmodinFunction(typmodinName);
 502         if (typmodoutName)
 503                 typmodoutOid = findTypeTypmodoutFunction(typmodoutName);
 504
 505         /*
 506          * Convert analysis function proc name to an OID. If no analysis function
 507          * is specified, we'll use zero to select the built-in default algorithm.
 508          */
 509         if (analyzeName)
 510                 analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
 511
 512         /*
 513          * Check permissions on functions.      We choose to require the creator/owner
 514          * of a type to also own the underlying functions.      Since creating a type
 515          * is tantamount to granting public execute access on the functions, the
 516          * minimum sane check would be for execute-with-grant-option.  But we
 517          * don't have a way to make the type go away if the grant option is
 518          * revoked, so ownership seems better.
 519          */
 520 #ifdef NOT_USED
 521         /* XXX this is unnecessary given the superuser check above */
 522         if (inputOid && !pg_proc_ownercheck(inputOid, GetUserId()))
 523                 aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_PROC,
 524                                            NameListToString(inputName));
 525         if (outputOid && !pg_proc_ownercheck(outputOid, GetUserId()))
 526                 aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_PROC,
 527                                            NameListToString(outputName));
 528         if (receiveOid && !pg_proc_ownercheck(receiveOid, GetUserId()))
 529                 aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_PROC,
 530                                            NameListToString(receiveName));
 531         if (sendOid && !pg_proc_ownercheck(sendOid, GetUserId()))
 532                 aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_PROC,
 533                                            NameListToString(sendName));
 534         if (typmodinOid && !pg_proc_ownercheck(typmodinOid, GetUserId()))
 535                 aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_PROC,
 536                                            NameListToString(typmodinName));
 537         if (typmodoutOid && !pg_proc_ownercheck(typmodoutOid, GetUserId()))
 538                 aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_PROC,
 539                                            NameListToString(typmodoutName));
 540         if (analyzeOid && !pg_proc_ownercheck(analyzeOid, GetUserId()))
 541                 aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_PROC,
 542                                            NameListToString(analyzeName));
 543 #endif
 544
 545         array_oid = AssignTypeArrayOid();
 546
 547         /*
 548          * now have TypeCreate do all the real work.
 549          *
 550          * Note: the pg_type.oid is stored in user tables as array elements (base
 551          * types) in ArrayType and in composite types in DatumTupleFields.      This
 552          * oid must be preserved by binary upgrades.
 553          */
 554         typoid =
 555                 TypeCreate(InvalidOid,  /* no predetermined type OID */
 556                                    typeName,    /* type name */
 557                                    typeNamespace,               /* namespace */
 558                                    InvalidOid,  /* relation oid (n/a here) */
 559                                    0,                   /* relation kind (ditto) */
 560                                    GetUserId(), /* owner's ID */
 561                                    internalLength,              /* internal size */
 562                                    TYPTYPE_BASE,        /* type-type (base type) */
 563                                    category,    /* type-category */
 564                                    preferred,   /* is it a preferred type? */
 565                                    delimiter,   /* array element delimiter */
 566                                    inputOid,    /* input procedure */
 567                                    outputOid,   /* output procedure */
 568                                    receiveOid,  /* receive procedure */
 569                                    sendOid,             /* send procedure */
 570                                    typmodinOid, /* typmodin procedure */
 571                                    typmodoutOid,        /* typmodout procedure */
 572                                    analyzeOid,  /* analyze procedure */
 573                                    elemType,    /* element type ID */
 574                                    false,               /* this is not an array type */
 575                                    array_oid,   /* array type we are about to create */
 576                                    InvalidOid,  /* base type ID (only for domains) */
 577                                    defaultValue,        /* default type value */
 578                                    NULL,                /* no binary form available */
 579                                    byValue,             /* passed by value */
 580                                    alignment,   /* required alignment */
 581                                    storage,             /* TOAST strategy */
 582                                    -1,                  /* typMod (Domains only) */
 583                                    0,                   /* Array Dimensions of typbasetype */
 584                                    false,               /* Type NOT NULL */
 585                                    collation);  /* type's collation */
 586
 587         /*
 588          * Create the array type that goes with it.
 589          */
 590         array_type = makeArrayTypeName(typeName, typeNamespace);
 591
 592         /* alignment must be 'i' or 'd' for arrays */
 593         alignment = (alignment == 'd') ? 'd' : 'i';
 594
 595         TypeCreate(array_oid,           /* force assignment of this type OID */
 596                            array_type,          /* type name */
 597                            typeNamespace,       /* namespace */
 598                            InvalidOid,          /* relation oid (n/a here) */
 599                            0,                           /* relation kind (ditto) */
 600                            GetUserId(),         /* owner's ID */
 601                            -1,                          /* internal size (always varlena) */
 602                            TYPTYPE_BASE,        /* type-type (base type) */
 603                            TYPCATEGORY_ARRAY,           /* type-category (array) */
 604                            false,                       /* array types are never preferred */
 605                            delimiter,           /* array element delimiter */
 606                            F_ARRAY_IN,          /* input procedure */
 607                            F_ARRAY_OUT,         /* output procedure */
 608                            F_ARRAY_RECV,        /* receive procedure */
 609                            F_ARRAY_SEND,        /* send procedure */
 610                            typmodinOid,         /* typmodin procedure */
 611                            typmodoutOid,        /* typmodout procedure */
 612                            F_ARRAY_TYPANALYZE,          /* analyze procedure */
 613                            typoid,                      /* element type ID */
 614                            true,                        /* yes this is an array type */
 615                            InvalidOid,          /* no further array type */
 616                            InvalidOid,          /* base type ID */
 617                            NULL,                        /* never a default type value */
 618                            NULL,                        /* binary default isn't sent either */
 619                            false,                       /* never passed by value */
 620                            alignment,           /* see above */
 621                            'x',                         /* ARRAY is always toastable */
 622                            -1,                          /* typMod (Domains only) */
 623                            0,                           /* Array dimensions of typbasetype */
 624                            false,                       /* Type NOT NULL */
 625                            collation);          /* type's collation */
 626
 627         pfree(array_type);
 628 }
 629
 630 /*
 631  * Guts of type deletion.
 632  */
 633 void
 634 RemoveTypeById(Oid typeOid)
 635 {
 636         Relation        relation;
 637         HeapTuple       tup;
 638
 639         relation = heap_open(TypeRelationId, RowExclusiveLock);
 640
 641         tup = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typeOid));
 642         if (!HeapTupleIsValid(tup))
 643                 elog(ERROR, "cache lookup failed for type %u", typeOid);
 644
 645         simple_heap_delete(relation, &tup->t_self);
 646
 647         /*
 648          * If it is an enum, delete the pg_enum entries too; we don't bother with
 649          * making dependency entries for those, so it has to be done "by hand"
 650          * here.
 651          */
 652         if (((Form_pg_type) GETSTRUCT(tup))->typtype == TYPTYPE_ENUM)
 653                 EnumValuesDelete(typeOid);
 654
 655         /*
 656          * If it is a range type, delete the pg_range entry too; we don't bother
 657          * with making a dependency entry for that, so it has to be done "by hand"
 658          * here.
 659          */
 660         if (((Form_pg_type) GETSTRUCT(tup))->typtype == TYPTYPE_RANGE)
 661                 RangeDelete(typeOid);
 662
 663         ReleaseSysCache(tup);
 664
 665         heap_close(relation, RowExclusiveLock);
 666 }
 667
 668
 669 /*
 670  * DefineDomain
 671  *              Registers a new domain.
 672  */
 673 void
 674 DefineDomain(CreateDomainStmt *stmt)
 675 {
 676         char       *domainName;
 677         Oid                     domainNamespace;
 678         AclResult       aclresult;
 679         int16           internalLength;
 680         Oid                     inputProcedure;
 681         Oid                     outputProcedure;
 682         Oid                     receiveProcedure;
 683         Oid                     sendProcedure;
 684         Oid                     analyzeProcedure;
 685         bool            byValue;
 686         char            category;
 687         char            delimiter;
 688         char            alignment;
 689         char            storage;
 690         char            typtype;
 691         Datum           datum;
 692         bool            isnull;
 693         char       *defaultValue = NULL;
 694         char       *defaultValueBin = NULL;
 695         bool            saw_default = false;
 696         bool            typNotNull = false;
 697         bool            nullDefined = false;
 698         int32           typNDims = list_length(stmt->typeName->arrayBounds);
 699         HeapTuple       typeTup;
 700         List       *schema = stmt->constraints;
 701         ListCell   *listptr;
 702         Oid                     basetypeoid;
 703         Oid                     domainoid;
 704         Oid                     old_type_oid;
 705         Oid                     domaincoll;
 706         Form_pg_type baseType;
 707         int32           basetypeMod;
 708         Oid                     baseColl;
 709
 710         /* Convert list of names to a name and namespace */
 711         domainNamespace = QualifiedNameGetCreationNamespace(stmt->domainname,
 712                                                                                                                 &domainName);
 713
 714         /* Check we have creation rights in target namespace */
 715         aclresult = pg_namespace_aclcheck(domainNamespace, GetUserId(),
 716                                                                           ACL_CREATE);
 717         if (aclresult != ACLCHECK_OK)
 718                 aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
 719                                            get_namespace_name(domainNamespace));
 720
 721         /*
 722          * Check for collision with an existing type name.      If there is one and
 723          * it's an autogenerated array, we can rename it out of the way.
 724          */
 725         old_type_oid = GetSysCacheOid2(TYPENAMENSP,
 726                                                                    CStringGetDatum(domainName),
 727                                                                    ObjectIdGetDatum(domainNamespace));
 728         if (OidIsValid(old_type_oid))
 729         {
 730                 if (!moveArrayTypeName(old_type_oid, domainName, domainNamespace))
 731                         ereport(ERROR,
 732                                         (errcode(ERRCODE_DUPLICATE_OBJECT),
 733                                          errmsg("type \"%s\" already exists", domainName)));
 734         }
 735
 736         /*
 737          * Look up the base type.
 738          */
 739         typeTup = typenameType(NULL, stmt->typeName, &basetypeMod);
 740         baseType = (Form_pg_type) GETSTRUCT(typeTup);
 741         basetypeoid = HeapTupleGetOid(typeTup);
 742
 743         /*
 744          * Base type must be a plain base type, another domain, an enum or a range
 745          * type. Domains over pseudotypes would create a security hole.  Domains
 746          * over composite types might be made to work in the future, but not
 747          * today.
 748          */
 749         typtype = baseType->typtype;
 750         if (typtype != TYPTYPE_BASE &&
 751                 typtype != TYPTYPE_DOMAIN &&
 752                 typtype != TYPTYPE_ENUM &&
 753                 typtype != TYPTYPE_RANGE)
 754                 ereport(ERROR,
 755                                 (errcode(ERRCODE_DATATYPE_MISMATCH),
 756                                  errmsg("\"%s\" is not a valid base type for a domain",
 757                                                 TypeNameToString(stmt->typeName))));
 758
 759         aclresult = pg_type_aclcheck(basetypeoid, GetUserId(), ACL_USAGE);
 760         if (aclresult != ACLCHECK_OK)
 761                 aclcheck_error_type(aclresult, basetypeoid);
 762
 763         /*
 764          * Identify the collation if any
 765          */
 766         baseColl = baseType->typcollation;
 767         if (stmt->collClause)
 768                 domaincoll = get_collation_oid(stmt->collClause->collname, false);
 769         else
 770                 domaincoll = baseColl;
 771
 772         /* Complain if COLLATE is applied to an uncollatable type */
 773         if (OidIsValid(domaincoll) && !OidIsValid(baseColl))
 774                 ereport(ERROR,
 775                                 (errcode(ERRCODE_DATATYPE_MISMATCH),
 776                                  errmsg("collations are not supported by type %s",
 777                                                 format_type_be(basetypeoid))));
 778
 779         /* passed by value */
 780         byValue = baseType->typbyval;
 781
 782         /* Required Alignment */
 783         alignment = baseType->typalign;
 784
 785         /* TOAST Strategy */
 786         storage = baseType->typstorage;
 787
 788         /* Storage Length */
 789         internalLength = baseType->typlen;
 790
 791         /* Type Category */
 792         category = baseType->typcategory;
 793
 794         /* Array element Delimiter */
 795         delimiter = baseType->typdelim;
 796
 797         /* I/O Functions */
 798         inputProcedure = F_DOMAIN_IN;
 799         outputProcedure = baseType->typoutput;
 800         receiveProcedure = F_DOMAIN_RECV;
 801         sendProcedure = baseType->typsend;
 802
 803         /* Domains never accept typmods, so no typmodin/typmodout needed */
 804
 805         /* Analysis function */
 806         analyzeProcedure = baseType->typanalyze;
 807
 808         /* Inherited default value */
 809         datum = SysCacheGetAttr(TYPEOID, typeTup,
 810                                                         Anum_pg_type_typdefault, &isnull);
 811         if (!isnull)
 812                 defaultValue = TextDatumGetCString(datum);
 813
 814         /* Inherited default binary value */
 815         datum = SysCacheGetAttr(TYPEOID, typeTup,
 816                                                         Anum_pg_type_typdefaultbin, &isnull);
 817         if (!isnull)
 818                 defaultValueBin = TextDatumGetCString(datum);
 819
 820         /*
 821          * Run through constraints manually to avoid the additional processing
 822          * conducted by DefineRelation() and friends.
 823          */
 824         foreach(listptr, schema)
 825         {
 826                 Constraint *constr = lfirst(listptr);
 827
 828                 if (!IsA(constr, Constraint))
 829                         elog(ERROR, "unrecognized node type: %d",
 830                                  (int) nodeTag(constr));
 831                 switch (constr->contype)
 832                 {
 833                         case CONSTR_DEFAULT:
 834
 835                                 /*
 836                                  * The inherited default value may be overridden by the user
 837                                  * with the DEFAULT <expr> clause ... but only once.
 838                                  */
 839                                 if (saw_default)
 840                                         ereport(ERROR,
 841                                                         (errcode(ERRCODE_SYNTAX_ERROR),
 842                                                          errmsg("multiple default expressions")));
 843                                 saw_default = true;
 844
 845                                 if (constr->raw_expr)
 846                                 {
 847                                         ParseState *pstate;
 848                                         Node       *defaultExpr;
 849
 850                                         /* Create a dummy ParseState for transformExpr */
 851                                         pstate = make_parsestate(NULL);
 852
 853                                         /*
 854                                          * Cook the constr->raw_expr into an expression. Note:
 855                                          * name is strictly for error message
 856                                          */
 857                                         defaultExpr = cookDefault(pstate, constr->raw_expr,
 858                                                                                           basetypeoid,
 859                                                                                           basetypeMod,
 860                                                                                           domainName);
 861
 862                                         /*
 863                                          * If the expression is just a NULL constant, we treat it
 864                                          * like not having a default.
 865                                          *
 866                                          * Note that if the basetype is another domain, we'll see
 867                                          * a CoerceToDomain expr here and not discard the default.
 868                                          * This is critical because the domain default needs to be
 869                                          * retained to override any default that the base domain
 870                                          * might have.
 871                                          */
 872                                         if (defaultExpr == NULL ||
 873                                                 (IsA(defaultExpr, Const) &&
 874                                                  ((Const *) defaultExpr)->constisnull))
 875                                         {
 876                                                 defaultValue = NULL;
 877                                                 defaultValueBin = NULL;
 878                                         }
 879                                         else
 880                                         {
 881                                                 /*
 882                                                  * Expression must be stored as a nodeToString result,
 883                                                  * but we also require a valid textual representation
 884                                                  * (mainly to make life easier for pg_dump).
 885                                                  */
 886                                                 defaultValue =
 887                                                         deparse_expression(defaultExpr,
 888                                                                                            deparse_context_for(domainName,
 889                                                                                                                                  InvalidOid),
 890                                                                                            false, false);
 891                                                 defaultValueBin = nodeToString(defaultExpr);
 892                                         }
 893                                 }
 894                                 else
 895                                 {
 896                                         /* No default (can this still happen?) */
 897                                         defaultValue = NULL;
 898                                         defaultValueBin = NULL;
 899                                 }
 900                                 break;
 901
 902                         case CONSTR_NOTNULL:
 903                                 if (nullDefined && !typNotNull)
 904                                         ereport(ERROR,
 905                                                         (errcode(ERRCODE_SYNTAX_ERROR),
 906                                                    errmsg("conflicting NULL/NOT NULL constraints")));
 907                                 typNotNull = true;
 908                                 nullDefined = true;
 909                                 break;
 910
 911                         case CONSTR_NULL:
 912                                 if (nullDefined && typNotNull)
 913                                         ereport(ERROR,
 914                                                         (errcode(ERRCODE_SYNTAX_ERROR),
 915                                                    errmsg("conflicting NULL/NOT NULL constraints")));
 916                                 typNotNull = false;
 917                                 nullDefined = true;
 918                                 break;
 919
 920                         case CONSTR_CHECK:
 921
 922                                 /*
 923                                  * Check constraints are handled after domain creation, as
 924                                  * they require the Oid of the domain
 925                                  */
 926                                 break;
 927
 928                                 /*
 929                                  * All else are error cases
 930                                  */
 931                         case CONSTR_UNIQUE:
 932                                 ereport(ERROR,
 933                                                 (errcode(ERRCODE_SYNTAX_ERROR),
 934                                          errmsg("unique constraints not possible for domains")));
 935                                 break;
 936
 937                         case CONSTR_PRIMARY:
 938                                 ereport(ERROR,
 939                                                 (errcode(ERRCODE_SYNTAX_ERROR),
 940                                 errmsg("primary key constraints not possible for domains")));
 941                                 break;
 942
 943                         case CONSTR_EXCLUSION:
 944                                 ereport(ERROR,
 945                                                 (errcode(ERRCODE_SYNTAX_ERROR),
 946                                   errmsg("exclusion constraints not possible for domains")));
 947                                 break;
 948
 949                         case CONSTR_FOREIGN:
 950                                 ereport(ERROR,
 951                                                 (errcode(ERRCODE_SYNTAX_ERROR),
 952                                 errmsg("foreign key constraints not possible for domains")));
 953                                 break;
 954
 955                         case CONSTR_ATTR_DEFERRABLE:
 956                         case CONSTR_ATTR_NOT_DEFERRABLE:
 957                         case CONSTR_ATTR_DEFERRED:
 958                         case CONSTR_ATTR_IMMEDIATE:
 959                                 ereport(ERROR,
 960                                                 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
 961                                                  errmsg("specifying constraint deferrability not supported for domains")));
 962                                 break;
 963
 964                         default:
 965                                 elog(ERROR, "unrecognized constraint subtype: %d",
 966                                          (int) constr->contype);
 967                                 break;
 968                 }
 969         }
 970
 971         /*
 972          * Have TypeCreate do all the real work.
 973          */
 974         domainoid =
 975                 TypeCreate(InvalidOid,  /* no predetermined type OID */
 976                                    domainName,  /* type name */
 977                                    domainNamespace,             /* namespace */
 978                                    InvalidOid,  /* relation oid (n/a here) */
 979                                    0,                   /* relation kind (ditto) */
 980                                    GetUserId(), /* owner's ID */
 981                                    internalLength,              /* internal size */
 982                                    TYPTYPE_DOMAIN,              /* type-type (domain type) */
 983                                    category,    /* type-category */
 984                                    false,               /* domain types are never preferred */
 985                                    delimiter,   /* array element delimiter */
 986                                    inputProcedure,              /* input procedure */
 987                                    outputProcedure,             /* output procedure */
 988                                    receiveProcedure,    /* receive procedure */
 989                                    sendProcedure,               /* send procedure */
 990                                    InvalidOid,  /* typmodin procedure - none */
 991                                    InvalidOid,  /* typmodout procedure - none */
 992                                    analyzeProcedure,    /* analyze procedure */
 993                                    InvalidOid,  /* no array element type */
 994                                    false,               /* this isn't an array */
 995                                    InvalidOid,  /* no arrays for domains (yet) */
 996                                    basetypeoid, /* base type ID */
 997                                    defaultValue,        /* default type value (text) */
 998                                    defaultValueBin,             /* default type value (binary) */
 999                                    byValue,             /* passed by value */
1000                                    alignment,   /* required alignment */
1001                                    storage,             /* TOAST strategy */
1002                                    basetypeMod, /* typeMod value */
1003                                    typNDims,    /* Array dimensions for base type */
1004                                    typNotNull,  /* Type NOT NULL */
1005                                    domaincoll); /* type's collation */
1006
1007         /*
1008          * Process constraints which refer to the domain ID returned by TypeCreate
1009          */
1010         foreach(listptr, schema)
1011         {
1012                 Constraint *constr = lfirst(listptr);
1013
1014                 /* it must be a Constraint, per check above */
1015
1016                 switch (constr->contype)
1017                 {
1018                         case CONSTR_CHECK:
1019                                 domainAddConstraint(domainoid, domainNamespace,
1020                                                                         basetypeoid, basetypeMod,
1021                                                                         constr, domainName);
1022                                 break;
1023
1024                                 /* Other constraint types were fully processed above */
1025
1026                         default:
1027                                 break;
1028                 }
1029
1030                 /* CCI so we can detect duplicate constraint names */
1031                 CommandCounterIncrement();
1032         }
1033
1034         /*
1035          * Now we can clean up.
1036          */
1037         ReleaseSysCache(typeTup);
1038 }
1039
1040
1041 /*
1042  * DefineEnum
1043  *              Registers a new enum.
1044  */
1045 void
1046 DefineEnum(CreateEnumStmt *stmt)
1047 {
1048         char       *enumName;
1049         char       *enumArrayName;
1050         Oid                     enumNamespace;
1051         Oid                     enumTypeOid;
1052         AclResult       aclresult;
1053         Oid                     old_type_oid;
1054         Oid                     enumArrayOid;
1055
1056         /* Convert list of names to a name and namespace */
1057         enumNamespace = QualifiedNameGetCreationNamespace(stmt->typeName,
1058                                                                                                           &enumName);
1059
1060         /* Check we have creation rights in target namespace */
1061         aclresult = pg_namespace_aclcheck(enumNamespace, GetUserId(), ACL_CREATE);
1062         if (aclresult != ACLCHECK_OK)
1063                 aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
1064                                            get_namespace_name(enumNamespace));
1065
1066         /*
1067          * Check for collision with an existing type name.      If there is one and
1068          * it's an autogenerated array, we can rename it out of the way.
1069          */
1070         old_type_oid = GetSysCacheOid2(TYPENAMENSP,
1071                                                                    CStringGetDatum(enumName),
1072                                                                    ObjectIdGetDatum(enumNamespace));
1073         if (OidIsValid(old_type_oid))
1074         {
1075                 if (!moveArrayTypeName(old_type_oid, enumName, enumNamespace))
1076                         ereport(ERROR,
1077                                         (errcode(ERRCODE_DUPLICATE_OBJECT),
1078                                          errmsg("type \"%s\" already exists", enumName)));
1079         }
1080
1081         enumArrayOid = AssignTypeArrayOid();
1082
1083         /* Create the pg_type entry */
1084         enumTypeOid =
1085                 TypeCreate(InvalidOid,  /* no predetermined type OID */
1086                                    enumName,    /* type name */
1087                                    enumNamespace,               /* namespace */
1088                                    InvalidOid,  /* relation oid (n/a here) */
1089                                    0,                   /* relation kind (ditto) */
1090                                    GetUserId(), /* owner's ID */
1091                                    sizeof(Oid), /* internal size */
1092                                    TYPTYPE_ENUM,        /* type-type (enum type) */
1093                                    TYPCATEGORY_ENUM,    /* type-category (enum type) */
1094                                    false,               /* enum types are never preferred */
1095                                    DEFAULT_TYPDELIM,    /* array element delimiter */
1096                                    F_ENUM_IN,   /* input procedure */
1097                                    F_ENUM_OUT,  /* output procedure */
1098                                    F_ENUM_RECV, /* receive procedure */
1099                                    F_ENUM_SEND, /* send procedure */
1100                                    InvalidOid,  /* typmodin procedure - none */
1101                                    InvalidOid,  /* typmodout procedure - none */
1102                                    InvalidOid,  /* analyze procedure - default */
1103                                    InvalidOid,  /* element type ID */
1104                                    false,               /* this is not an array type */
1105                                    enumArrayOid,        /* array type we are about to create */
1106                                    InvalidOid,  /* base type ID (only for domains) */
1107                                    NULL,                /* never a default type value */
1108                                    NULL,                /* binary default isn't sent either */
1109                                    true,                /* always passed by value */
1110                                    'i',                 /* int alignment */
1111                                    'p',                 /* TOAST strategy always plain */
1112                                    -1,                  /* typMod (Domains only) */
1113                                    0,                   /* Array dimensions of typbasetype */
1114                                    false,               /* Type NOT NULL */
1115                                    InvalidOid); /* type's collation */
1116
1117         /* Enter the enum's values into pg_enum */
1118         EnumValuesCreate(enumTypeOid, stmt->vals);
1119
1120         /*
1121          * Create the array type that goes with it.
1122          */
1123         enumArrayName = makeArrayTypeName(enumName, enumNamespace);
1124
1125         TypeCreate(enumArrayOid,        /* force assignment of this type OID */
1126                            enumArrayName,       /* type name */
1127                            enumNamespace,       /* namespace */
1128                            InvalidOid,          /* relation oid (n/a here) */
1129                            0,                           /* relation kind (ditto) */
1130                            GetUserId(),         /* owner's ID */
1131                            -1,                          /* internal size (always varlena) */
1132                            TYPTYPE_BASE,        /* type-type (base type) */
1133                            TYPCATEGORY_ARRAY,           /* type-category (array) */
1134                            false,                       /* array types are never preferred */
1135                            DEFAULT_TYPDELIM,    /* array element delimiter */
1136                            F_ARRAY_IN,          /* input procedure */
1137                            F_ARRAY_OUT,         /* output procedure */
1138                            F_ARRAY_RECV,        /* receive procedure */
1139                            F_ARRAY_SEND,        /* send procedure */
1140                            InvalidOid,          /* typmodin procedure - none */
1141                            InvalidOid,          /* typmodout procedure - none */
1142                            F_ARRAY_TYPANALYZE,          /* analyze procedure */
1143                            enumTypeOid,         /* element type ID */
1144                            true,                        /* yes this is an array type */
1145                            InvalidOid,          /* no further array type */
1146                            InvalidOid,          /* base type ID */
1147                            NULL,                        /* never a default type value */
1148                            NULL,                        /* binary default isn't sent either */
1149                            false,                       /* never passed by value */
1150                            'i',                         /* enums have align i, so do their arrays */
1151                            'x',                         /* ARRAY is always toastable */
1152                            -1,                          /* typMod (Domains only) */
1153                            0,                           /* Array dimensions of typbasetype */
1154                            false,                       /* Type NOT NULL */
1155                            InvalidOid);         /* type's collation */
1156
1157         pfree(enumArrayName);
1158 }
1159
1160 /*
1161  * AlterEnum
1162  *              Adds a new label to an existing enum.
1163  */
1164 void
1165 AlterEnum(AlterEnumStmt *stmt)
1166 {
1167         Oid                     enum_type_oid;
1168         TypeName   *typename;
1169         HeapTuple       tup;
1170
1171         /* Make a TypeName so we can use standard type lookup machinery */
1172         typename = makeTypeNameFromNameList(stmt->typeName);
1173         enum_type_oid = typenameTypeId(NULL, typename);
1174
1175         tup = SearchSysCache1(TYPEOID, ObjectIdGetDatum(enum_type_oid));
1176         if (!HeapTupleIsValid(tup))
1177                 elog(ERROR, "cache lookup failed for type %u", enum_type_oid);
1178
1179         /* Check it's an enum and check user has permission to ALTER the enum */
1180         checkEnumOwner(tup);
1181
1182         /* Add the new label */
1183         AddEnumLabel(enum_type_oid, stmt->newVal,
1184                                  stmt->newValNeighbor, stmt->newValIsAfter);
1185
1186         ReleaseSysCache(tup);
1187 }
1188
1189
1190 /*
1191  * checkEnumOwner
1192  *
1193  * Check that the type is actually an enum and that the current user
1194  * has permission to do ALTER TYPE on it.  Throw an error if not.
1195  */
1196 static void
1197 checkEnumOwner(HeapTuple tup)
1198 {
1199         Form_pg_type typTup = (Form_pg_type) GETSTRUCT(tup);
1200
1201         /* Check that this is actually an enum */
1202         if (typTup->typtype != TYPTYPE_ENUM)
1203                 ereport(ERROR,
1204                                 (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1205                                  errmsg("%s is not an enum",
1206                                                 format_type_be(HeapTupleGetOid(tup)))));
1207
1208         /* Permission check: must own type */
1209         if (!pg_type_ownercheck(HeapTupleGetOid(tup), GetUserId()))
1210                 aclcheck_error_type(ACLCHECK_NOT_OWNER, HeapTupleGetOid(tup));
1211 }
1212
1213
1214 /*
1215  * DefineRange
1216  *              Registers a new range type.
1217  */
1218 void
1219 DefineRange(CreateRangeStmt *stmt)
1220 {
1221         char       *typeName;
1222         Oid                     typeNamespace;
1223         Oid                     typoid;
1224         char       *rangeArrayName;
1225         Oid                     rangeArrayOid;
1226         Oid                     rangeSubtype = InvalidOid;
1227         List       *rangeSubOpclassName = NIL;
1228         List       *rangeCollationName = NIL;
1229         List       *rangeCanonicalName = NIL;
1230         List       *rangeSubtypeDiffName = NIL;
1231         Oid                     rangeSubOpclass;
1232         Oid                     rangeCollation;
1233         regproc         rangeCanonical;
1234         regproc         rangeSubtypeDiff;
1235         int16           subtyplen;
1236         bool            subtypbyval;
1237         char            subtypalign;
1238         char            alignment;
1239         AclResult       aclresult;
1240         ListCell   *lc;
1241
1242         /* Convert list of names to a name and namespace */
1243         typeNamespace = QualifiedNameGetCreationNamespace(stmt->typeName,
1244                                                                                                           &typeName);
1245
1246         /* Check we have creation rights in target namespace */
1247         aclresult = pg_namespace_aclcheck(typeNamespace, GetUserId(), ACL_CREATE);
1248         if (aclresult != ACLCHECK_OK)
1249                 aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
1250                                            get_namespace_name(typeNamespace));
1251
1252         /*
1253          * Look to see if type already exists.
1254          */
1255         typoid = GetSysCacheOid2(TYPENAMENSP,
1256                                                          CStringGetDatum(typeName),
1257                                                          ObjectIdGetDatum(typeNamespace));
1258
1259         /*
1260          * If it's not a shell, see if it's an autogenerated array type, and if so
1261          * rename it out of the way.
1262          */
1263         if (OidIsValid(typoid) && get_typisdefined(typoid))
1264         {
1265                 if (moveArrayTypeName(typoid, typeName, typeNamespace))
1266                         typoid = InvalidOid;
1267                 else
1268                         ereport(ERROR,
1269                                         (errcode(ERRCODE_DUPLICATE_OBJECT),
1270                                          errmsg("type \"%s\" already exists", typeName)));
1271         }
1272
1273         /*
1274          * If it doesn't exist, create it as a shell, so that the OID is known for
1275          * use in the range function definitions.
1276          */
1277         if (!OidIsValid(typoid))
1278         {
1279                 typoid = TypeShellMake(typeName, typeNamespace, GetUserId());
1280                 /* Make new shell type visible for modification below */
1281                 CommandCounterIncrement();
1282         }
1283
1284         /* Extract the parameters from the parameter list */
1285         foreach(lc, stmt->params)
1286         {
1287                 DefElem    *defel = (DefElem *) lfirst(lc);
1288
1289                 if (pg_strcasecmp(defel->defname, "subtype") == 0)
1290                 {
1291                         if (OidIsValid(rangeSubtype))
1292                                 ereport(ERROR,
1293                                                 (errcode(ERRCODE_SYNTAX_ERROR),
1294                                                  errmsg("conflicting or redundant options")));
1295                         /* we can look up the subtype name immediately */
1296                         rangeSubtype = typenameTypeId(NULL, defGetTypeName(defel));
1297                 }
1298                 else if (pg_strcasecmp(defel->defname, "subtype_opclass") == 0)
1299                 {
1300                         if (rangeSubOpclassName != NIL)
1301                                 ereport(ERROR,
1302                                                 (errcode(ERRCODE_SYNTAX_ERROR),
1303                                                  errmsg("conflicting or redundant options")));
1304                         rangeSubOpclassName = defGetQualifiedName(defel);
1305                 }
1306                 else if (pg_strcasecmp(defel->defname, "collation") == 0)
1307                 {
1308                         if (rangeCollationName != NIL)
1309                                 ereport(ERROR,
1310                                                 (errcode(ERRCODE_SYNTAX_ERROR),
1311                                                  errmsg("conflicting or redundant options")));
1312                         rangeCollationName = defGetQualifiedName(defel);
1313                 }
1314                 else if (pg_strcasecmp(defel->defname, "canonical") == 0)
1315                 {
1316                         if (rangeCanonicalName != NIL)
1317                                 ereport(ERROR,
1318                                                 (errcode(ERRCODE_SYNTAX_ERROR),
1319                                                  errmsg("conflicting or redundant options")));
1320                         rangeCanonicalName = defGetQualifiedName(defel);
1321                 }
1322                 else if (pg_strcasecmp(defel->defname, "subtype_diff") == 0)
1323                 {
1324                         if (rangeSubtypeDiffName != NIL)
1325                                 ereport(ERROR,
1326                                                 (errcode(ERRCODE_SYNTAX_ERROR),
1327                                                  errmsg("conflicting or redundant options")));
1328                         rangeSubtypeDiffName = defGetQualifiedName(defel);
1329                 }
1330                 else
1331                         ereport(ERROR,
1332                                         (errcode(ERRCODE_SYNTAX_ERROR),
1333                                          errmsg("type attribute \"%s\" not recognized",
1334                                                         defel->defname)));
1335         }
1336
1337         /* Must have a subtype */
1338         if (!OidIsValid(rangeSubtype))
1339                 ereport(ERROR,
1340                                 (errcode(ERRCODE_SYNTAX_ERROR),
1341                                  errmsg("type attribute \"subtype\" is required")));
1342         /* disallow ranges of pseudotypes */
1343         if (get_typtype(rangeSubtype) == TYPTYPE_PSEUDO)
1344                 ereport(ERROR,
1345                                 (errcode(ERRCODE_DATATYPE_MISMATCH),
1346                                  errmsg("range subtype cannot be %s",
1347                                                 format_type_be(rangeSubtype))));
1348
1349         /* Identify subopclass */
1350         rangeSubOpclass = findRangeSubOpclass(rangeSubOpclassName, rangeSubtype);
1351
1352         /* Identify collation to use, if any */
1353         if (type_is_collatable(rangeSubtype))
1354         {
1355                 if (rangeCollationName != NIL)
1356                         rangeCollation = get_collation_oid(rangeCollationName, false);
1357                 else
1358                         rangeCollation = get_typcollation(rangeSubtype);
1359         }
1360         else
1361         {
1362                 if (rangeCollationName != NIL)
1363                         ereport(ERROR,
1364                                         (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1365                                          errmsg("range collation specified but subtype does not support collation")));
1366                 rangeCollation = InvalidOid;
1367         }
1368
1369         /* Identify support functions, if provided */
1370         if (rangeCanonicalName != NIL)
1371                 rangeCanonical = findRangeCanonicalFunction(rangeCanonicalName,
1372                                                                                                         typoid);
1373         else
1374                 rangeCanonical = InvalidOid;
1375
1376         if (rangeSubtypeDiffName != NIL)
1377                 rangeSubtypeDiff = findRangeSubtypeDiffFunction(rangeSubtypeDiffName,
1378                                                                                                                 rangeSubtype);
1379         else
1380                 rangeSubtypeDiff = InvalidOid;
1381
1382         get_typlenbyvalalign(rangeSubtype,
1383                                                  &subtyplen, &subtypbyval, &subtypalign);
1384
1385         /* alignment must be 'i' or 'd' for ranges */
1386         alignment = (subtypalign == 'd') ? 'd' : 'i';
1387
1388         /* Allocate OID for array type */
1389         rangeArrayOid = AssignTypeArrayOid();
1390
1391         /* Create the pg_type entry */
1392         typoid =
1393                 TypeCreate(InvalidOid,  /* no predetermined type OID */
1394                                    typeName,    /* type name */
1395                                    typeNamespace,               /* namespace */
1396                                    InvalidOid,  /* relation oid (n/a here) */
1397                                    0,                   /* relation kind (ditto) */
1398                                    GetUserId(), /* owner's ID */
1399                                    -1,                  /* internal size (always varlena) */
1400                                    TYPTYPE_RANGE,               /* type-type (range type) */
1401                                    TYPCATEGORY_RANGE,   /* type-category (range type) */
1402                                    false,               /* range types are never preferred */
1403                                    DEFAULT_TYPDELIM,    /* array element delimiter */
1404                                    F_RANGE_IN,  /* input procedure */
1405                                    F_RANGE_OUT, /* output procedure */
1406                                    F_RANGE_RECV,        /* receive procedure */
1407                                    F_RANGE_SEND,        /* send procedure */
1408                                    InvalidOid,  /* typmodin procedure - none */
1409                                    InvalidOid,  /* typmodout procedure - none */
1410                                    F_RANGE_TYPANALYZE,  /* analyze procedure */
1411                                    InvalidOid,  /* element type ID - none */
1412                                    false,               /* this is not an array type */
1413                                    rangeArrayOid,               /* array type we are about to create */
1414                                    InvalidOid,  /* base type ID (only for domains) */
1415                                    NULL,                /* never a default type value */
1416                                    NULL,                /* no binary form available either */
1417                                    false,               /* never passed by value */
1418                                    alignment,   /* alignment */
1419                                    'x',                 /* TOAST strategy (always extended) */
1420                                    -1,                  /* typMod (Domains only) */
1421                                    0,                   /* Array dimensions of typbasetype */
1422                                    false,               /* Type NOT NULL */
1423                                    InvalidOid); /* type's collation (ranges never have one) */
1424
1425         /* Create the entry in pg_range */
1426         RangeCreate(typoid, rangeSubtype, rangeCollation, rangeSubOpclass,
1427                                 rangeCanonical, rangeSubtypeDiff);
1428
1429         /*
1430          * Create the array type that goes with it.
1431          */
1432         rangeArrayName = makeArrayTypeName(typeName, typeNamespace);
1433
1434         TypeCreate(rangeArrayOid,       /* force assignment of this type OID */
1435                            rangeArrayName,      /* type name */
1436                            typeNamespace,       /* namespace */
1437                            InvalidOid,          /* relation oid (n/a here) */
1438                            0,                           /* relation kind (ditto) */
1439                            GetUserId(),         /* owner's ID */
1440                            -1,                          /* internal size (always varlena) */
1441                            TYPTYPE_BASE,        /* type-type (base type) */
1442                            TYPCATEGORY_ARRAY,           /* type-category (array) */
1443                            false,                       /* array types are never preferred */
1444                            DEFAULT_TYPDELIM,    /* array element delimiter */
1445                            F_ARRAY_IN,          /* input procedure */
1446                            F_ARRAY_OUT,         /* output procedure */
1447                            F_ARRAY_RECV,        /* receive procedure */
1448                            F_ARRAY_SEND,        /* send procedure */
1449                            InvalidOid,          /* typmodin procedure - none */
1450                            InvalidOid,          /* typmodout procedure - none */
1451                            F_ARRAY_TYPANALYZE,          /* analyze procedure */
1452                            typoid,                      /* element type ID */
1453                            true,                        /* yes this is an array type */
1454                            InvalidOid,          /* no further array type */
1455                            InvalidOid,          /* base type ID */
1456                            NULL,                        /* never a default type value */
1457                            NULL,                        /* binary default isn't sent either */
1458                            false,                       /* never passed by value */
1459                            alignment,           /* alignment - same as range's */
1460                            'x',                         /* ARRAY is always toastable */
1461                            -1,                          /* typMod (Domains only) */
1462                            0,                           /* Array dimensions of typbasetype */
1463                            false,                       /* Type NOT NULL */
1464                            InvalidOid);         /* typcollation */
1465
1466         pfree(rangeArrayName);
1467
1468         /* And create the constructor functions for this range type */
1469         makeRangeConstructors(typeName, typeNamespace, typoid, rangeSubtype);
1470 }
1471
1472 /*
1473  * Because there may exist several range types over the same subtype, the
1474  * range type can't be uniquely determined from the subtype.  So it's
1475  * impossible to define a polymorphic constructor; we have to generate new
1476  * constructor functions explicitly for each range type.
1477  *
1478  * We actually define 4 functions, with 0 through 3 arguments.  This is just
1479  * to offer more convenience for the user.
1480  */
1481 static void
1482 makeRangeConstructors(const char *name, Oid namespace,
1483                                           Oid rangeOid, Oid subtype)
1484 {
1485         static const char *const prosrc[2] = {"range_constructor2",
1486         "range_constructor3"};
1487         static const int pronargs[2] = {2, 3};
1488
1489         Oid                     constructorArgTypes[3];
1490         ObjectAddress myself,
1491                                 referenced;
1492         int                     i;
1493
1494         constructorArgTypes[0] = subtype;
1495         constructorArgTypes[1] = subtype;
1496         constructorArgTypes[2] = TEXTOID;
1497
1498         referenced.classId = TypeRelationId;
1499         referenced.objectId = rangeOid;
1500         referenced.objectSubId = 0;
1501
1502         for (i = 0; i < lengthof(prosrc); i++)
1503         {
1504                 oidvector  *constructorArgTypesVector;
1505                 Oid                     procOid;
1506
1507                 constructorArgTypesVector = buildoidvector(constructorArgTypes,
1508                                                                                                    pronargs[i]);
1509
1510                 procOid = ProcedureCreate(name, /* name: same as range type */
1511                                                                   namespace,    /* namespace */
1512                                                                   false,                /* replace */
1513                                                                   false,                /* returns set */
1514                                                                   rangeOid,             /* return type */
1515                                                                   BOOTSTRAP_SUPERUSERID,                /* proowner */
1516                                                                   INTERNALlanguageId,   /* language */
1517                                                                   F_FMGR_INTERNAL_VALIDATOR,    /* language validator */
1518                                                                   prosrc[i],    /* prosrc */
1519                                                                   NULL, /* probin */
1520                                                                   false,                /* isAgg */
1521                                                                   false,                /* isWindowFunc */
1522                                                                   false,                /* security_definer */
1523                                                                   false,                /* leakproof */
1524                                                                   false,                /* isStrict */
1525                                                                   PROVOLATILE_IMMUTABLE,                /* volatility */
1526                                                                   constructorArgTypesVector,    /* parameterTypes */
1527                                                                   PointerGetDatum(NULL),                /* allParameterTypes */
1528                                                                   PointerGetDatum(NULL),                /* parameterModes */
1529                                                                   PointerGetDatum(NULL),                /* parameterNames */
1530                                                                   NIL,  /* parameterDefaults */
1531                                                                   PointerGetDatum(NULL),                /* proconfig */
1532                                                                   1.0,  /* procost */
1533                                                                   0.0); /* prorows */
1534
1535                 /*
1536                  * Make the constructors internally-dependent on the range type so
1537                  * that they go away silently when the type is dropped.  Note that
1538                  * pg_dump depends on this choice to avoid dumping the constructors.
1539                  */
1540                 myself.classId = ProcedureRelationId;
1541                 myself.objectId = procOid;
1542                 myself.objectSubId = 0;
1543
1544                 recordDependencyOn(&myself, &referenced, DEPENDENCY_INTERNAL);
1545         }
1546 }
1547
1548
1549 /*
1550  * Find suitable I/O functions for a type.
1551  *
1552  * typeOid is the type's OID (which will already exist, if only as a shell
1553  * type).
1554  */
1555
1556 static Oid
1557 findTypeInputFunction(List *procname, Oid typeOid)
1558 {
1559         Oid                     argList[3];
1560         Oid                     procOid;
1561
1562         /*
1563          * Input functions can take a single argument of type CSTRING, or three
1564          * arguments (string, typioparam OID, typmod).
1565          *
1566          * For backwards compatibility we allow OPAQUE in place of CSTRING; if we
1567          * see this, we issue a warning and fix up the pg_proc entry.
1568          */
1569         argList[0] = CSTRINGOID;
1570
1571         procOid = LookupFuncName(procname, 1, argList, true);
1572         if (OidIsValid(procOid))
1573                 return procOid;
1574
1575         argList[1] = OIDOID;
1576         argList[2] = INT4OID;
1577
1578         procOid = LookupFuncName(procname, 3, argList, true);
1579         if (OidIsValid(procOid))
1580                 return procOid;
1581
1582         /* No luck, try it with OPAQUE */
1583         argList[0] = OPAQUEOID;
1584
1585         procOid = LookupFuncName(procname, 1, argList, true);
1586
1587         if (!OidIsValid(procOid))
1588         {
1589                 argList[1] = OIDOID;
1590                 argList[2] = INT4OID;
1591
1592                 procOid = LookupFuncName(procname, 3, argList, true);
1593         }
1594
1595         if (OidIsValid(procOid))
1596         {
1597                 /* Found, but must complain and fix the pg_proc entry */
1598                 ereport(WARNING,
1599                                 (errmsg("changing argument type of function %s from \"opaque\" to \"cstring\"",
1600                                                 NameListToString(procname))));
1601                 SetFunctionArgType(procOid, 0, CSTRINGOID);
1602
1603                 /*
1604                  * Need CommandCounterIncrement since DefineType will likely try to
1605                  * alter the pg_proc tuple again.
1606                  */
1607                 CommandCounterIncrement();
1608
1609                 return procOid;
1610         }
1611
1612         /* Use CSTRING (preferred) in the error message */
1613         argList[0] = CSTRINGOID;
1614
1615         ereport(ERROR,
1616                         (errcode(ERRCODE_UNDEFINED_FUNCTION),
1617                          errmsg("function %s does not exist",
1618                                         func_signature_string(procname, 1, NIL, argList))));
1619
1620         return InvalidOid;                      /* keep compiler quiet */
1621 }
1622
1623 static Oid
1624 findTypeOutputFunction(List *procname, Oid typeOid)
1625 {
1626         Oid                     argList[1];
1627         Oid                     procOid;
1628
1629         /*
1630          * Output functions can take a single argument of the type.
1631          *
1632          * For backwards compatibility we allow OPAQUE in place of the actual type
1633          * name; if we see this, we issue a warning and fix up the pg_proc entry.
1634          */
1635         argList[0] = typeOid;
1636
1637         procOid = LookupFuncName(procname, 1, argList, true);
1638         if (OidIsValid(procOid))
1639                 return procOid;
1640
1641         /* No luck, try it with OPAQUE */
1642         argList[0] = OPAQUEOID;
1643
1644         procOid = LookupFuncName(procname, 1, argList, true);
1645
1646         if (OidIsValid(procOid))
1647         {
1648                 /* Found, but must complain and fix the pg_proc entry */
1649                 ereport(WARNING,
1650                 (errmsg("changing argument type of function %s from \"opaque\" to %s",
1651                                 NameListToString(procname), format_type_be(typeOid))));
1652                 SetFunctionArgType(procOid, 0, typeOid);
1653
1654                 /*
1655                  * Need CommandCounterIncrement since DefineType will likely try to
1656                  * alter the pg_proc tuple again.
1657                  */
1658                 CommandCounterIncrement();
1659
1660                 return procOid;
1661         }
1662
1663         /* Use type name, not OPAQUE, in the failure message. */
1664         argList[0] = typeOid;
1665
1666         ereport(ERROR,
1667                         (errcode(ERRCODE_UNDEFINED_FUNCTION),
1668                          errmsg("function %s does not exist",
1669                                         func_signature_string(procname, 1, NIL, argList))));
1670
1671         return InvalidOid;                      /* keep compiler quiet */
1672 }
1673
1674 static Oid
1675 findTypeReceiveFunction(List *procname, Oid typeOid)
1676 {
1677         Oid                     argList[3];
1678         Oid                     procOid;
1679
1680         /*
1681          * Receive functions can take a single argument of type INTERNAL, or three
1682          * arguments (internal, typioparam OID, typmod).
1683          */
1684         argList[0] = INTERNALOID;
1685
1686         procOid = LookupFuncName(procname, 1, argList, true);
1687         if (OidIsValid(procOid))
1688                 return procOid;
1689
1690         argList[1] = OIDOID;
1691         argList[2] = INT4OID;
1692
1693         procOid = LookupFuncName(procname, 3, argList, true);
1694         if (OidIsValid(procOid))
1695                 return procOid;
1696
1697         ereport(ERROR,
1698                         (errcode(ERRCODE_UNDEFINED_FUNCTION),
1699                          errmsg("function %s does not exist",
1700                                         func_signature_string(procname, 1, NIL, argList))));
1701
1702         return InvalidOid;                      /* keep compiler quiet */
1703 }
1704
1705 static Oid
1706 findTypeSendFunction(List *procname, Oid typeOid)
1707 {
1708         Oid                     argList[1];
1709         Oid                     procOid;
1710
1711         /*
1712          * Send functions can take a single argument of the type.
1713          */
1714         argList[0] = typeOid;
1715
1716         procOid = LookupFuncName(procname, 1, argList, true);
1717         if (OidIsValid(procOid))
1718                 return procOid;
1719
1720         ereport(ERROR,
1721                         (errcode(ERRCODE_UNDEFINED_FUNCTION),
1722                          errmsg("function %s does not exist",
1723                                         func_signature_string(procname, 1, NIL, argList))));
1724
1725         return InvalidOid;                      /* keep compiler quiet */
1726 }
1727
1728 static Oid
1729 findTypeTypmodinFunction(List *procname)
1730 {
1731         Oid                     argList[1];
1732         Oid                     procOid;
1733
1734         /*
1735          * typmodin functions always take one cstring[] argument and return int4.
1736          */
1737         argList[0] = CSTRINGARRAYOID;
1738
1739         procOid = LookupFuncName(procname, 1, argList, true);
1740         if (!OidIsValid(procOid))
1741                 ereport(ERROR,
1742                                 (errcode(ERRCODE_UNDEFINED_FUNCTION),
1743                                  errmsg("function %s does not exist",
1744                                                 func_signature_string(procname, 1, NIL, argList))));
1745
1746         if (get_func_rettype(procOid) != INT4OID)
1747                 ereport(ERROR,
1748                                 (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
1749                                  errmsg("typmod_in function %s must return type \"integer\"",
1750                                                 NameListToString(procname))));
1751
1752         return procOid;
1753 }
1754
1755 static Oid
1756 findTypeTypmodoutFunction(List *procname)
1757 {
1758         Oid                     argList[1];
1759         Oid                     procOid;
1760
1761         /*
1762          * typmodout functions always take one int4 argument and return cstring.
1763          */
1764         argList[0] = INT4OID;
1765
1766         procOid = LookupFuncName(procname, 1, argList, true);
1767         if (!OidIsValid(procOid))
1768                 ereport(ERROR,
1769                                 (errcode(ERRCODE_UNDEFINED_FUNCTION),
1770                                  errmsg("function %s does not exist",
1771                                                 func_signature_string(procname, 1, NIL, argList))));
1772
1773         if (get_func_rettype(procOid) != CSTRINGOID)
1774                 ereport(ERROR,
1775                                 (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
1776                                  errmsg("typmod_out function %s must return type \"cstring\"",
1777                                                 NameListToString(procname))));
1778
1779         return procOid;
1780 }
1781
1782 static Oid
1783 findTypeAnalyzeFunction(List *procname, Oid typeOid)
1784 {
1785         Oid                     argList[1];
1786         Oid                     procOid;
1787
1788         /*
1789          * Analyze functions always take one INTERNAL argument and return bool.
1790          */
1791         argList[0] = INTERNALOID;
1792
1793         procOid = LookupFuncName(procname, 1, argList, true);
1794         if (!OidIsValid(procOid))
1795                 ereport(ERROR,
1796                                 (errcode(ERRCODE_UNDEFINED_FUNCTION),
1797                                  errmsg("function %s does not exist",
1798                                                 func_signature_string(procname, 1, NIL, argList))));
1799
1800         if (get_func_rettype(procOid) != BOOLOID)
1801                 ereport(ERROR,
1802                                 (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
1803                           errmsg("type analyze function %s must return type \"boolean\"",
1804                                          NameListToString(procname))));
1805
1806         return procOid;
1807 }
1808
1809 /*
1810  * Find suitable support functions and opclasses for a range type.
1811  */
1812
1813 /*
1814  * Find named btree opclass for subtype, or default btree opclass if
1815  * opcname is NIL.
1816  */
1817 static Oid
1818 findRangeSubOpclass(List *opcname, Oid subtype)
1819 {
1820         Oid                     opcid;
1821         Oid                     opInputType;
1822
1823         if (opcname != NIL)
1824         {
1825                 opcid = get_opclass_oid(BTREE_AM_OID, opcname, false);
1826
1827                 /*
1828                  * Verify that the operator class accepts this datatype. Note we will
1829                  * accept binary compatibility.
1830                  */
1831                 opInputType = get_opclass_input_type(opcid);
1832                 if (!IsBinaryCoercible(subtype, opInputType))
1833                         ereport(ERROR,
1834                                         (errcode(ERRCODE_DATATYPE_MISMATCH),
1835                                  errmsg("operator class \"%s\" does not accept data type %s",
1836                                                 NameListToString(opcname),
1837                                                 format_type_be(subtype))));
1838         }
1839         else
1840         {
1841                 opcid = GetDefaultOpClass(subtype, BTREE_AM_OID);
1842                 if (!OidIsValid(opcid))
1843                 {
1844                         /* We spell the error message identically to GetIndexOpClass */
1845                         ereport(ERROR,
1846                                         (errcode(ERRCODE_UNDEFINED_OBJECT),
1847                                          errmsg("data type %s has no default operator class for access method \"%s\"",
1848                                                         format_type_be(subtype), "btree"),
1849                                          errhint("You must specify an operator class for the range type or define a default operator class for the subtype.")));
1850                 }
1851         }
1852
1853         return opcid;
1854 }
1855
1856 static Oid
1857 findRangeCanonicalFunction(List *procname, Oid typeOid)
1858 {
1859         Oid                     argList[1];
1860         Oid                     procOid;
1861         AclResult       aclresult;
1862
1863         /*
1864          * Range canonical functions must take and return the range type, and must
1865          * be immutable.
1866          */
1867         argList[0] = typeOid;
1868
1869         procOid = LookupFuncName(procname, 1, argList, true);
1870
1871         if (!OidIsValid(procOid))
1872                 ereport(ERROR,
1873                                 (errcode(ERRCODE_UNDEFINED_FUNCTION),
1874                                  errmsg("function %s does not exist",
1875                                                 func_signature_string(procname, 1, NIL, argList))));
1876
1877         if (get_func_rettype(procOid) != typeOid)
1878                 ereport(ERROR,
1879                                 (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
1880                                  errmsg("range canonical function %s must return range type",
1881                                                 func_signature_string(procname, 1, NIL, argList))));
1882
1883         if (func_volatile(procOid) != PROVOLATILE_IMMUTABLE)
1884                 ereport(ERROR,
1885                                 (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
1886                                  errmsg("range canonical function %s must be immutable",
1887                                                 func_signature_string(procname, 1, NIL, argList))));
1888
1889         /* Also, range type's creator must have permission to call function */
1890         aclresult = pg_proc_aclcheck(procOid, GetUserId(), ACL_EXECUTE);
1891         if (aclresult != ACLCHECK_OK)
1892                 aclcheck_error(aclresult, ACL_KIND_PROC, get_func_name(procOid));
1893
1894         return procOid;
1895 }
1896
1897 static Oid
1898 findRangeSubtypeDiffFunction(List *procname, Oid subtype)
1899 {
1900         Oid                     argList[2];
1901         Oid                     procOid;
1902         AclResult       aclresult;
1903
1904         /*
1905          * Range subtype diff functions must take two arguments of the subtype,
1906          * must return float8, and must be immutable.
1907          */
1908         argList[0] = subtype;
1909         argList[1] = subtype;
1910
1911         procOid = LookupFuncName(procname, 2, argList, true);
1912
1913         if (!OidIsValid(procOid))
1914                 ereport(ERROR,
1915                                 (errcode(ERRCODE_UNDEFINED_FUNCTION),
1916                                  errmsg("function %s does not exist",
1917                                                 func_signature_string(procname, 2, NIL, argList))));
1918
1919         if (get_func_rettype(procOid) != FLOAT8OID)
1920                 ereport(ERROR,
1921                                 (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
1922                                  errmsg("range subtype diff function %s must return type double precision",
1923                                                 func_signature_string(procname, 2, NIL, argList))));
1924
1925         if (func_volatile(procOid) != PROVOLATILE_IMMUTABLE)
1926                 ereport(ERROR,
1927                                 (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
1928                                  errmsg("range subtype diff function %s must be immutable",
1929                                                 func_signature_string(procname, 2, NIL, argList))));
1930
1931         /* Also, range type's creator must have permission to call function */
1932         aclresult = pg_proc_aclcheck(procOid, GetUserId(), ACL_EXECUTE);
1933         if (aclresult != ACLCHECK_OK)
1934                 aclcheck_error(aclresult, ACL_KIND_PROC, get_func_name(procOid));
1935
1936         return procOid;
1937 }
1938
1939 /*
1940  *      AssignTypeArrayOid
1941  *
1942  *      Pre-assign the type's array OID for use in pg_type.typarray
1943  */
1944 Oid
1945 AssignTypeArrayOid(void)
1946 {
1947         Oid                     type_array_oid;
1948
1949         /* Use binary-upgrade override for pg_type.typarray, if supplied. */
1950         if (IsBinaryUpgrade && OidIsValid(binary_upgrade_next_array_pg_type_oid))
1951         {
1952                 type_array_oid = binary_upgrade_next_array_pg_type_oid;
1953                 binary_upgrade_next_array_pg_type_oid = InvalidOid;
1954         }
1955         else
1956         {
1957                 Relation        pg_type = heap_open(TypeRelationId, AccessShareLock);
1958
1959                 type_array_oid = GetNewOid(pg_type);
1960                 heap_close(pg_type, AccessShareLock);
1961         }
1962
1963         return type_array_oid;
1964 }
1965
1966
1967 /*-------------------------------------------------------------------
1968  * DefineCompositeType
1969  *
1970  * Create a Composite Type relation.
1971  * `DefineRelation' does all the work, we just provide the correct
1972  * arguments!
1973  *
1974  * If the relation already exists, then 'DefineRelation' will abort
1975  * the xact...
1976  *
1977  * DefineCompositeType returns relid for use when creating
1978  * an implicit composite type during function creation
1979  *-------------------------------------------------------------------
1980  */
1981 Oid
1982 DefineCompositeType(RangeVar *typevar, List *coldeflist)
1983 {
1984         CreateStmt *createStmt = makeNode(CreateStmt);
1985         Oid                     old_type_oid;
1986         Oid                     typeNamespace;
1987         Oid                     relid;
1988
1989         /*
1990          * now set the parameters for keys/inheritance etc. All of these are
1991          * uninteresting for composite types...
1992          */
1993         createStmt->relation = typevar;
1994         createStmt->tableElts = coldeflist;
1995         createStmt->inhRelations = NIL;
1996         createStmt->constraints = NIL;
1997         createStmt->options = list_make1(defWithOids(false));
1998         createStmt->oncommit = ONCOMMIT_NOOP;
1999         createStmt->tablespacename = NULL;
2000         createStmt->if_not_exists = false;
2001
2002         /*
2003          * Check for collision with an existing type name. If there is one and
2004          * it's an autogenerated array, we can rename it out of the way.  This
2005          * check is here mainly to get a better error message about a "type"
2006          * instead of below about a "relation".
2007          */
2008         typeNamespace = RangeVarGetAndCheckCreationNamespace(createStmt->relation,
2009                                                                                                                  NoLock, NULL);
2010         RangeVarAdjustRelationPersistence(createStmt->relation, typeNamespace);
2011         old_type_oid =
2012                 GetSysCacheOid2(TYPENAMENSP,
2013                                                 CStringGetDatum(createStmt->relation->relname),
2014                                                 ObjectIdGetDatum(typeNamespace));
2015         if (OidIsValid(old_type_oid))
2016         {
2017                 if (!moveArrayTypeName(old_type_oid, createStmt->relation->relname, typeNamespace))
2018                         ereport(ERROR,
2019                                         (errcode(ERRCODE_DUPLICATE_OBJECT),
2020                                          errmsg("type \"%s\" already exists", createStmt->relation->relname)));
2021         }
2022
2023         /*
2024          * Finally create the relation.  This also creates the type.
2025          */
2026         relid = DefineRelation(createStmt, RELKIND_COMPOSITE_TYPE, InvalidOid);
2027         Assert(relid != InvalidOid);
2028         return relid;
2029 }
2030
2031 /*
2032  * AlterDomainDefault
2033  *
2034  * Routine implementing ALTER DOMAIN SET/DROP DEFAULT statements.
2035  */
2036 void
2037 AlterDomainDefault(List *names, Node *defaultRaw)
2038 {
2039         TypeName   *typename;
2040         Oid                     domainoid;
2041         HeapTuple       tup;
2042         ParseState *pstate;
2043         Relation        rel;
2044         char       *defaultValue;
2045         Node       *defaultExpr = NULL;         /* NULL if no default specified */
2046         Datum           new_record[Natts_pg_type];
2047         bool            new_record_nulls[Natts_pg_type];
2048         bool            new_record_repl[Natts_pg_type];
2049         HeapTuple       newtuple;
2050         Form_pg_type typTup;
2051
2052         /* Make a TypeName so we can use standard type lookup machinery */
2053         typename = makeTypeNameFromNameList(names);
2054         domainoid = typenameTypeId(NULL, typename);
2055
2056         /* Look up the domain in the type table */
2057         rel = heap_open(TypeRelationId, RowExclusiveLock);
2058
2059         tup = SearchSysCacheCopy1(TYPEOID, ObjectIdGetDatum(domainoid));
2060         if (!HeapTupleIsValid(tup))
2061                 elog(ERROR, "cache lookup failed for type %u", domainoid);
2062         typTup = (Form_pg_type) GETSTRUCT(tup);
2063
2064         /* Check it's a domain and check user has permission for ALTER DOMAIN */
2065         checkDomainOwner(tup);
2066
2067         /* Setup new tuple */
2068         MemSet(new_record, (Datum) 0, sizeof(new_record));
2069         MemSet(new_record_nulls, false, sizeof(new_record_nulls));
2070         MemSet(new_record_repl, false, sizeof(new_record_repl));
2071
2072         /* Store the new default into the tuple */
2073         if (defaultRaw)
2074         {
2075                 /* Create a dummy ParseState for transformExpr */
2076                 pstate = make_parsestate(NULL);
2077
2078                 /*
2079                  * Cook the colDef->raw_expr into an expression. Note: Name is
2080                  * strictly for error message
2081                  */
2082                 defaultExpr = cookDefault(pstate, defaultRaw,
2083                                                                   typTup->typbasetype,
2084                                                                   typTup->typtypmod,
2085                                                                   NameStr(typTup->typname));
2086
2087                 /*
2088                  * If the expression is just a NULL constant, we treat the command
2089                  * like ALTER ... DROP DEFAULT.  (But see note for same test in
2090                  * DefineDomain.)
2091                  */
2092                 if (defaultExpr == NULL ||
2093                         (IsA(defaultExpr, Const) &&((Const *) defaultExpr)->constisnull))
2094                 {
2095                         /* Default is NULL, drop it */
2096                         new_record_nulls[Anum_pg_type_typdefaultbin - 1] = true;
2097                         new_record_repl[Anum_pg_type_typdefaultbin - 1] = true;
2098                         new_record_nulls[Anum_pg_type_typdefault - 1] = true;
2099                         new_record_repl[Anum_pg_type_typdefault - 1] = true;
2100                 }
2101                 else
2102                 {
2103                         /*
2104                          * Expression must be stored as a nodeToString result, but we also
2105                          * require a valid textual representation (mainly to make life
2106                          * easier for pg_dump).
2107                          */
2108                         defaultValue = deparse_expression(defaultExpr,
2109                                                                 deparse_context_for(NameStr(typTup->typname),
2110                                                                                                         InvalidOid),
2111                                                                                           false, false);
2112
2113                         /*
2114                          * Form an updated tuple with the new default and write it back.
2115                          */
2116                         new_record[Anum_pg_type_typdefaultbin - 1] = CStringGetTextDatum(nodeToString(defaultExpr));
2117
2118                         new_record_repl[Anum_pg_type_typdefaultbin - 1] = true;
2119                         new_record[Anum_pg_type_typdefault - 1] = CStringGetTextDatum(defaultValue);
2120                         new_record_repl[Anum_pg_type_typdefault - 1] = true;
2121                 }
2122         }
2123         else
2124         {
2125                 /* ALTER ... DROP DEFAULT */
2126                 new_record_nulls[Anum_pg_type_typdefaultbin - 1] = true;
2127                 new_record_repl[Anum_pg_type_typdefaultbin - 1] = true;
2128                 new_record_nulls[Anum_pg_type_typdefault - 1] = true;
2129                 new_record_repl[Anum_pg_type_typdefault - 1] = true;
2130         }
2131
2132         newtuple = heap_modify_tuple(tup, RelationGetDescr(rel),
2133                                                                  new_record, new_record_nulls,
2134                                                                  new_record_repl);
2135
2136         simple_heap_update(rel, &tup->t_self, newtuple);
2137
2138         CatalogUpdateIndexes(rel, newtuple);
2139
2140         /* Rebuild dependencies */
2141         GenerateTypeDependencies(typTup->typnamespace,
2142                                                          domainoid,
2143                                                          InvalidOid,            /* typrelid is n/a */
2144                                                          0, /* relation kind is n/a */
2145                                                          typTup->typowner,
2146                                                          typTup->typinput,
2147                                                          typTup->typoutput,
2148                                                          typTup->typreceive,
2149                                                          typTup->typsend,
2150                                                          typTup->typmodin,
2151                                                          typTup->typmodout,
2152                                                          typTup->typanalyze,
2153                                                          InvalidOid,
2154                                                          false,         /* a domain isn't an implicit array */
2155                                                          typTup->typbasetype,
2156                                                          typTup->typcollation,
2157                                                          defaultExpr,
2158                                                          true);         /* Rebuild is true */
2159
2160         /* Clean up */
2161         heap_close(rel, NoLock);
2162         heap_freetuple(newtuple);
2163 }
2164
2165 /*
2166  * AlterDomainNotNull
2167  *
2168  * Routine implementing ALTER DOMAIN SET/DROP NOT NULL statements.
2169  */
2170 void
2171 AlterDomainNotNull(List *names, bool notNull)
2172 {
2173         TypeName   *typename;
2174         Oid                     domainoid;
2175         Relation        typrel;
2176         HeapTuple       tup;
2177         Form_pg_type typTup;
2178
2179         /* Make a TypeName so we can use standard type lookup machinery */
2180         typename = makeTypeNameFromNameList(names);
2181         domainoid = typenameTypeId(NULL, typename);
2182
2183         /* Look up the domain in the type table */
2184         typrel = heap_open(TypeRelationId, RowExclusiveLock);
2185
2186         tup = SearchSysCacheCopy1(TYPEOID, ObjectIdGetDatum(domainoid));
2187         if (!HeapTupleIsValid(tup))
2188                 elog(ERROR, "cache lookup failed for type %u", domainoid);
2189         typTup = (Form_pg_type) GETSTRUCT(tup);
2190
2191         /* Check it's a domain and check user has permission for ALTER DOMAIN */
2192         checkDomainOwner(tup);
2193
2194         /* Is the domain already set to the desired constraint? */
2195         if (typTup->typnotnull == notNull)
2196         {
2197                 heap_close(typrel, RowExclusiveLock);
2198                 return;
2199         }
2200
2201         /* Adding a NOT NULL constraint requires checking existing columns */
2202         if (notNull)
2203         {
2204                 List       *rels;
2205                 ListCell   *rt;
2206
2207                 /* Fetch relation list with attributes based on this domain */
2208                 /* ShareLock is sufficient to prevent concurrent data changes */
2209
2210                 rels = get_rels_with_domain(domainoid, ShareLock);
2211
2212                 foreach(rt, rels)
2213                 {
2214                         RelToCheck *rtc = (RelToCheck *) lfirst(rt);
2215                         Relation        testrel = rtc->rel;
2216                         TupleDesc       tupdesc = RelationGetDescr(testrel);
2217                         HeapScanDesc scan;
2218                         HeapTuple       tuple;
2219
2220                         /* Scan all tuples in this relation */
2221                         scan = heap_beginscan(testrel, SnapshotNow, 0, NULL);
2222                         while ((tuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
2223                         {
2224                                 int                     i;
2225
2226                                 /* Test attributes that are of the domain */
2227                                 for (i = 0; i < rtc->natts; i++)
2228                                 {
2229                                         int                     attnum = rtc->atts[i];
2230
2231                                         if (heap_attisnull(tuple, attnum))
2232                                                 ereport(ERROR,
2233                                                                 (errcode(ERRCODE_NOT_NULL_VIOLATION),
2234                                                                  errmsg("column \"%s\" of table \"%s\" contains null values",
2235                                                                 NameStr(tupdesc->attrs[attnum - 1]->attname),
2236                                                                                 RelationGetRelationName(testrel))));
2237                                 }
2238                         }
2239                         heap_endscan(scan);
2240
2241                         /* Close each rel after processing, but keep lock */
2242                         heap_close(testrel, NoLock);
2243                 }
2244         }
2245
2246         /*
2247          * Okay to update pg_type row.  We can scribble on typTup because it's a
2248          * copy.
2249          */
2250         typTup->typnotnull = notNull;
2251
2252         simple_heap_update(typrel, &tup->t_self, tup);
2253
2254         CatalogUpdateIndexes(typrel, tup);
2255
2256         /* Clean up */
2257         heap_freetuple(tup);
2258         heap_close(typrel, RowExclusiveLock);
2259 }
2260
2261 /*
2262  * AlterDomainDropConstraint
2263  *
2264  * Implements the ALTER DOMAIN DROP CONSTRAINT statement
2265  */
2266 void
2267 AlterDomainDropConstraint(List *names, const char *constrName,
2268                                                   DropBehavior behavior, bool missing_ok)
2269 {
2270         TypeName   *typename;
2271         Oid                     domainoid;
2272         HeapTuple       tup;
2273         Relation        rel;
2274         Relation        conrel;
2275         SysScanDesc conscan;
2276         ScanKeyData key[1];
2277         HeapTuple       contup;
2278         bool            found = false;
2279
2280         /* Make a TypeName so we can use standard type lookup machinery */
2281         typename = makeTypeNameFromNameList(names);
2282         domainoid = typenameTypeId(NULL, typename);
2283
2284         /* Look up the domain in the type table */
2285         rel = heap_open(TypeRelationId, RowExclusiveLock);
2286
2287         tup = SearchSysCacheCopy1(TYPEOID, ObjectIdGetDatum(domainoid));
2288         if (!HeapTupleIsValid(tup))
2289                 elog(ERROR, "cache lookup failed for type %u", domainoid);
2290
2291         /* Check it's a domain and check user has permission for ALTER DOMAIN */
2292         checkDomainOwner(tup);
2293
2294         /* Grab an appropriate lock on the pg_constraint relation */
2295         conrel = heap_open(ConstraintRelationId, RowExclusiveLock);
2296
2297         /* Use the index to scan only constraints of the target relation */
2298         ScanKeyInit(&key[0],
2299                                 Anum_pg_constraint_contypid,
2300                                 BTEqualStrategyNumber, F_OIDEQ,
2301                                 ObjectIdGetDatum(HeapTupleGetOid(tup)));
2302
2303         conscan = systable_beginscan(conrel, ConstraintTypidIndexId, true,
2304                                                                  SnapshotNow, 1, key);
2305
2306         /*
2307          * Scan over the result set, removing any matching entries.
2308          */
2309         while ((contup = systable_getnext(conscan)) != NULL)
2310         {
2311                 Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(contup);
2312
2313                 if (strcmp(NameStr(con->conname), constrName) == 0)
2314                 {
2315                         ObjectAddress conobj;
2316
2317                         conobj.classId = ConstraintRelationId;
2318                         conobj.objectId = HeapTupleGetOid(contup);
2319                         conobj.objectSubId = 0;
2320
2321                         performDeletion(&conobj, behavior, 0);
2322                         found = true;
2323                 }
2324         }
2325         /* Clean up after the scan */
2326         systable_endscan(conscan);
2327         heap_close(conrel, RowExclusiveLock);
2328
2329         heap_close(rel, NoLock);
2330
2331         if (!found)
2332         {
2333                 if (!missing_ok)
2334                         ereport(ERROR,
2335                                         (errcode(ERRCODE_UNDEFINED_OBJECT),
2336                                   errmsg("constraint \"%s\" of domain \"%s\" does not exist",
2337                                                  constrName, TypeNameToString(typename))));
2338                 else
2339                         ereport(NOTICE,
2340                                         (errmsg("constraint \"%s\" of domain \"%s\" does not exist, skipping",
2341                                                         constrName, TypeNameToString(typename))));
2342         }
2343 }
2344
2345 /*
2346  * AlterDomainAddConstraint
2347  *
2348  * Implements the ALTER DOMAIN .. ADD CONSTRAINT statement.
2349  */
2350 void
2351 AlterDomainAddConstraint(List *names, Node *newConstraint)
2352 {
2353         TypeName   *typename;
2354         Oid                     domainoid;
2355         Relation        typrel;
2356         HeapTuple       tup;
2357         Form_pg_type typTup;
2358         Constraint *constr;
2359         char       *ccbin;
2360
2361         /* Make a TypeName so we can use standard type lookup machinery */
2362         typename = makeTypeNameFromNameList(names);
2363         domainoid = typenameTypeId(NULL, typename);
2364
2365         /* Look up the domain in the type table */
2366         typrel = heap_open(TypeRelationId, RowExclusiveLock);
2367
2368         tup = SearchSysCacheCopy1(TYPEOID, ObjectIdGetDatum(domainoid));
2369         if (!HeapTupleIsValid(tup))
2370                 elog(ERROR, "cache lookup failed for type %u", domainoid);
2371         typTup = (Form_pg_type) GETSTRUCT(tup);
2372
2373         /* Check it's a domain and check user has permission for ALTER DOMAIN */
2374         checkDomainOwner(tup);
2375
2376         if (!IsA(newConstraint, Constraint))
2377                 elog(ERROR, "unrecognized node type: %d",
2378                          (int) nodeTag(newConstraint));
2379
2380         constr = (Constraint *) newConstraint;
2381
2382         switch (constr->contype)
2383         {
2384                 case CONSTR_CHECK:
2385                         /* processed below */
2386                         break;
2387
2388                 case CONSTR_UNIQUE:
2389                         ereport(ERROR,
2390                                         (errcode(ERRCODE_SYNTAX_ERROR),
2391                                          errmsg("unique constraints not possible for domains")));
2392                         break;
2393
2394                 case CONSTR_PRIMARY:
2395                         ereport(ERROR,
2396                                         (errcode(ERRCODE_SYNTAX_ERROR),
2397                                 errmsg("primary key constraints not possible for domains")));
2398                         break;
2399
2400                 case CONSTR_EXCLUSION:
2401                         ereport(ERROR,
2402                                         (errcode(ERRCODE_SYNTAX_ERROR),
2403                                   errmsg("exclusion constraints not possible for domains")));
2404                         break;
2405
2406                 case CONSTR_FOREIGN:
2407                         ereport(ERROR,
2408                                         (errcode(ERRCODE_SYNTAX_ERROR),
2409                                 errmsg("foreign key constraints not possible for domains")));
2410                         break;
2411
2412                 case CONSTR_ATTR_DEFERRABLE:
2413                 case CONSTR_ATTR_NOT_DEFERRABLE:
2414                 case CONSTR_ATTR_DEFERRED:
2415                 case CONSTR_ATTR_IMMEDIATE:
2416                         ereport(ERROR,
2417                                         (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2418                                          errmsg("specifying constraint deferrability not supported for domains")));
2419                         break;
2420
2421                 default:
2422                         elog(ERROR, "unrecognized constraint subtype: %d",
2423                                  (int) constr->contype);
2424                         break;
2425         }
2426
2427         /*
2428          * Since all other constraint types throw errors, this must be a check
2429          * constraint.  First, process the constraint expression and add an entry
2430          * to pg_constraint.
2431          */
2432
2433         ccbin = domainAddConstraint(HeapTupleGetOid(tup), typTup->typnamespace,
2434                                                                 typTup->typbasetype, typTup->typtypmod,
2435                                                                 constr, NameStr(typTup->typname));
2436
2437         /*
2438          * If requested to validate the constraint, test all values stored in the
2439          * attributes based on the domain the constraint is being added to.
2440          */
2441         if (!constr->skip_validation)
2442                 validateDomainConstraint(domainoid, ccbin);
2443
2444         /* Clean up */
2445         heap_close(typrel, RowExclusiveLock);
2446 }
2447
2448 /*
2449  * AlterDomainValidateConstraint
2450  *
2451  * Implements the ALTER DOMAIN .. VALIDATE CONSTRAINT statement.
2452  */
2453 void
2454 AlterDomainValidateConstraint(List *names, char *constrName)
2455 {
2456         TypeName   *typename;
2457         Oid                     domainoid;
2458         Relation        typrel;
2459         Relation        conrel;
2460         HeapTuple       tup;
2461         Form_pg_constraint con = NULL;
2462         Form_pg_constraint copy_con;
2463         char       *conbin;
2464         SysScanDesc scan;
2465         Datum           val;
2466         bool            found = false;
2467         bool            isnull;
2468         HeapTuple       tuple;
2469         HeapTuple       copyTuple;
2470         ScanKeyData key;
2471
2472         /* Make a TypeName so we can use standard type lookup machinery */
2473         typename = makeTypeNameFromNameList(names);
2474         domainoid = typenameTypeId(NULL, typename);
2475
2476         /* Look up the domain in the type table */
2477         typrel = heap_open(TypeRelationId, AccessShareLock);
2478
2479         tup = SearchSysCache1(TYPEOID, ObjectIdGetDatum(domainoid));
2480         if (!HeapTupleIsValid(tup))
2481                 elog(ERROR, "cache lookup failed for type %u", domainoid);
2482
2483         /* Check it's a domain and check user has permission for ALTER DOMAIN */
2484         checkDomainOwner(tup);
2485
2486         /*
2487          * Find and check the target constraint
2488          */
2489         conrel = heap_open(ConstraintRelationId, RowExclusiveLock);
2490         ScanKeyInit(&key,
2491                                 Anum_pg_constraint_contypid,
2492                                 BTEqualStrategyNumber, F_OIDEQ,
2493                                 ObjectIdGetDatum(domainoid));
2494         scan = systable_beginscan(conrel, ConstraintTypidIndexId,
2495                                                           true, SnapshotNow, 1, &key);
2496
2497         while (HeapTupleIsValid(tuple = systable_getnext(scan)))
2498         {
2499                 con = (Form_pg_constraint) GETSTRUCT(tuple);
2500                 if (strcmp(NameStr(con->conname), constrName) == 0)
2501                 {
2502                         found = true;
2503                         break;
2504                 }
2505         }
2506
2507         if (!found)
2508                 ereport(ERROR,
2509                                 (errcode(ERRCODE_UNDEFINED_OBJECT),
2510                                  errmsg("constraint \"%s\" of domain \"%s\" does not exist",
2511                                                 constrName, TypeNameToString(typename))));
2512
2513         if (con->contype != CONSTRAINT_CHECK)
2514                 ereport(ERROR,
2515                                 (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2516                 errmsg("constraint \"%s\" of domain \"%s\" is not a check constraint",
2517                            constrName, TypeNameToString(typename))));
2518
2519         val = SysCacheGetAttr(CONSTROID, tuple,
2520                                                   Anum_pg_constraint_conbin,
2521                                                   &isnull);
2522         if (isnull)
2523                 elog(ERROR, "null conbin for constraint %u",
2524                          HeapTupleGetOid(tuple));
2525         conbin = TextDatumGetCString(val);
2526
2527         validateDomainConstraint(domainoid, conbin);
2528
2529         /*
2530          * Now update the catalog, while we have the door open.
2531          */
2532         copyTuple = heap_copytuple(tuple);
2533         copy_con = (Form_pg_constraint) GETSTRUCT(copyTuple);
2534         copy_con->convalidated = true;
2535         simple_heap_update(conrel, &copyTuple->t_self, copyTuple);
2536         CatalogUpdateIndexes(conrel, copyTuple);
2537         heap_freetuple(copyTuple);
2538
2539         systable_endscan(scan);
2540
2541         heap_close(typrel, AccessShareLock);
2542         heap_close(conrel, RowExclusiveLock);
2543
2544         ReleaseSysCache(tup);
2545 }
2546
2547 static void
2548 validateDomainConstraint(Oid domainoid, char *ccbin)
2549 {
2550         Expr       *expr = (Expr *) stringToNode(ccbin);
2551         List       *rels;
2552         ListCell   *rt;
2553         EState     *estate;
2554         ExprContext *econtext;
2555         ExprState  *exprstate;
2556
2557         /* Need an EState to run ExecEvalExpr */
2558         estate = CreateExecutorState();
2559         econtext = GetPerTupleExprContext(estate);
2560
2561         /* build execution state for expr */
2562         exprstate = ExecPrepareExpr(expr, estate);
2563
2564         /* Fetch relation list with attributes based on this domain */
2565         /* ShareLock is sufficient to prevent concurrent data changes */
2566
2567         rels = get_rels_with_domain(domainoid, ShareLock);
2568
2569         foreach(rt, rels)
2570         {
2571                 RelToCheck *rtc = (RelToCheck *) lfirst(rt);
2572                 Relation        testrel = rtc->rel;
2573                 TupleDesc       tupdesc = RelationGetDescr(testrel);
2574                 HeapScanDesc scan;
2575                 HeapTuple       tuple;
2576
2577                 /* Scan all tuples in this relation */
2578                 scan = heap_beginscan(testrel, SnapshotNow, 0, NULL);
2579                 while ((tuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
2580                 {
2581                         int                     i;
2582
2583                         /* Test attributes that are of the domain */
2584                         for (i = 0; i < rtc->natts; i++)
2585                         {
2586                                 int                     attnum = rtc->atts[i];
2587                                 Datum           d;
2588                                 bool            isNull;
2589                                 Datum           conResult;
2590
2591                                 d = heap_getattr(tuple, attnum, tupdesc, &isNull);
2592
2593                                 econtext->domainValue_datum = d;
2594                                 econtext->domainValue_isNull = isNull;
2595
2596                                 conResult = ExecEvalExprSwitchContext(exprstate,
2597                                                                                                           econtext,
2598                                                                                                           &isNull, NULL);
2599
2600                                 if (!isNull && !DatumGetBool(conResult))
2601                                         ereport(ERROR,
2602                                                         (errcode(ERRCODE_CHECK_VIOLATION),
2603                                                          errmsg("column \"%s\" of table \"%s\" contains values that violate the new constraint",
2604                                                                 NameStr(tupdesc->attrs[attnum - 1]->attname),
2605                                                                         RelationGetRelationName(testrel))));
2606                         }
2607
2608                         ResetExprContext(econtext);
2609                 }
2610                 heap_endscan(scan);
2611
2612                 /* Hold relation lock till commit (XXX bad for concurrency) */
2613                 heap_close(testrel, NoLock);
2614         }
2615
2616         FreeExecutorState(estate);
2617 }
2618
2619 /*
2620  * get_rels_with_domain
2621  *
2622  * Fetch all relations / attributes which are using the domain
2623  *
2624  * The result is a list of RelToCheck structs, one for each distinct
2625  * relation, each containing one or more attribute numbers that are of
2626  * the domain type.  We have opened each rel and acquired the specified lock
2627  * type on it.
2628  *
2629  * We support nested domains by including attributes that are of derived
2630  * domain types.  Current callers do not need to distinguish between attributes
2631  * that are of exactly the given domain and those that are of derived domains.
2632  *
2633  * XXX this is completely broken because there is no way to lock the domain
2634  * to prevent columns from being added or dropped while our command runs.
2635  * We can partially protect against column drops by locking relations as we
2636  * come across them, but there is still a race condition (the window between
2637  * seeing a pg_depend entry and acquiring lock on the relation it references).
2638  * Also, holding locks on all these relations simultaneously creates a non-
2639  * trivial risk of deadlock.  We can minimize but not eliminate the deadlock
2640  * risk by using the weakest suitable lock (ShareLock for most callers).
2641  *
2642  * XXX the API for this is not sufficient to support checking domain values
2643  * that are inside composite types or arrays.  Currently we just error out
2644  * if a composite type containing the target domain is stored anywhere.
2645  * There are not currently arrays of domains; if there were, we could take
2646  * the same approach, but it'd be nicer to fix it properly.
2647  *
2648  * Generally used for retrieving a list of tests when adding
2649  * new constraints to a domain.
2650  */
2651 static List *
2652 get_rels_with_domain(Oid domainOid, LOCKMODE lockmode)
2653 {
2654         List       *result = NIL;
2655         Relation        depRel;
2656         ScanKeyData key[2];
2657         SysScanDesc depScan;
2658         HeapTuple       depTup;
2659
2660         Assert(lockmode != NoLock);
2661
2662         /*
2663          * We scan pg_depend to find those things that depend on the domain. (We
2664          * assume we can ignore refobjsubid for a domain.)
2665          */
2666         depRel = heap_open(DependRelationId, AccessShareLock);
2667
2668         ScanKeyInit(&key[0],
2669                                 Anum_pg_depend_refclassid,
2670                                 BTEqualStrategyNumber, F_OIDEQ,
2671                                 ObjectIdGetDatum(TypeRelationId));
2672         ScanKeyInit(&key[1],
2673                                 Anum_pg_depend_refobjid,
2674                                 BTEqualStrategyNumber, F_OIDEQ,
2675                                 ObjectIdGetDatum(domainOid));
2676
2677         depScan = systable_beginscan(depRel, DependReferenceIndexId, true,
2678                                                                  SnapshotNow, 2, key);
2679
2680         while (HeapTupleIsValid(depTup = systable_getnext(depScan)))
2681         {
2682                 Form_pg_depend pg_depend = (Form_pg_depend) GETSTRUCT(depTup);
2683                 RelToCheck *rtc = NULL;
2684                 ListCell   *rellist;
2685                 Form_pg_attribute pg_att;
2686                 int                     ptr;
2687
2688                 /* Check for directly dependent types --- must be domains */
2689                 if (pg_depend->classid == TypeRelationId)
2690                 {
2691                         Assert(get_typtype(pg_depend->objid) == TYPTYPE_DOMAIN);
2692
2693                         /*
2694                          * Recursively add dependent columns to the output list.  This is
2695                          * a bit inefficient since we may fail to combine RelToCheck
2696                          * entries when attributes of the same rel have different derived
2697                          * domain types, but it's probably not worth improving.
2698                          */
2699                         result = list_concat(result,
2700                                                                  get_rels_with_domain(pg_depend->objid,
2701                                                                                                           lockmode));
2702                         continue;
2703                 }
2704
2705                 /* Else, ignore dependees that aren't user columns of relations */
2706                 /* (we assume system columns are never of domain types) */
2707                 if (pg_depend->classid != RelationRelationId ||
2708                         pg_depend->objsubid <= 0)
2709                         continue;
2710
2711                 /* See if we already have an entry for this relation */
2712                 foreach(rellist, result)
2713                 {
2714                         RelToCheck *rt = (RelToCheck *) lfirst(rellist);
2715
2716                         if (RelationGetRelid(rt->rel) == pg_depend->objid)
2717                         {
2718                                 rtc = rt;
2719                                 break;
2720                         }
2721                 }
2722
2723                 if (rtc == NULL)
2724                 {
2725                         /* First attribute found for this relation */
2726                         Relation        rel;
2727
2728                         /* Acquire requested lock on relation */
2729                         rel = relation_open(pg_depend->objid, lockmode);
2730
2731                         /*
2732                          * Check to see if rowtype is stored anyplace as a composite-type
2733                          * column; if so we have to fail, for now anyway.
2734                          */
2735                         if (OidIsValid(rel->rd_rel->reltype))
2736                                 find_composite_type_dependencies(rel->rd_rel->reltype,
2737                                                                                                  NULL,
2738                                                                                                  format_type_be(domainOid));
2739
2740                         /* Otherwise we can ignore views, composite types, etc */
2741                         if (rel->rd_rel->relkind != RELKIND_RELATION)
2742                         {
2743                                 relation_close(rel, lockmode);
2744                                 continue;
2745                         }
2746
2747                         /* Build the RelToCheck entry with enough space for all atts */
2748                         rtc = (RelToCheck *) palloc(sizeof(RelToCheck));
2749                         rtc->rel = rel;
2750                         rtc->natts = 0;
2751                         rtc->atts = (int *) palloc(sizeof(int) * RelationGetNumberOfAttributes(rel));
2752                         result = lcons(rtc, result);
2753                 }
2754
2755                 /*
2756                  * Confirm column has not been dropped, and is of the expected type.
2757                  * This defends against an ALTER DROP COLUMN occurring just before we
2758                  * acquired lock ... but if the whole table were dropped, we'd still
2759                  * have a problem.
2760                  */
2761                 if (pg_depend->objsubid > RelationGetNumberOfAttributes(rtc->rel))
2762                         continue;
2763                 pg_att = rtc->rel->rd_att->attrs[pg_depend->objsubid - 1];
2764                 if (pg_att->attisdropped || pg_att->atttypid != domainOid)
2765                         continue;
2766
2767                 /*
2768                  * Okay, add column to result.  We store the columns in column-number
2769                  * order; this is just a hack to improve predictability of regression
2770                  * test output ...
2771                  */
2772                 Assert(rtc->natts < RelationGetNumberOfAttributes(rtc->rel));
2773
2774                 ptr = rtc->natts++;
2775                 while (ptr > 0 && rtc->atts[ptr - 1] > pg_depend->objsubid)
2776                 {
2777                         rtc->atts[ptr] = rtc->atts[ptr - 1];
2778                         ptr--;
2779                 }
2780                 rtc->atts[ptr] = pg_depend->objsubid;
2781         }
2782
2783         systable_endscan(depScan);
2784
2785         relation_close(depRel, AccessShareLock);
2786
2787         return result;
2788 }
2789
2790 /*
2791  * checkDomainOwner
2792  *
2793  * Check that the type is actually a domain and that the current user
2794  * has permission to do ALTER DOMAIN on it.  Throw an error if not.
2795  */
2796 void
2797 checkDomainOwner(HeapTuple tup)
2798 {
2799         Form_pg_type typTup = (Form_pg_type) GETSTRUCT(tup);
2800
2801         /* Check that this is actually a domain */
2802         if (typTup->typtype != TYPTYPE_DOMAIN)
2803                 ereport(ERROR,
2804                                 (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2805                                  errmsg("%s is not a domain",
2806                                                 format_type_be(HeapTupleGetOid(tup)))));
2807
2808         /* Permission check: must own type */
2809         if (!pg_type_ownercheck(HeapTupleGetOid(tup), GetUserId()))
2810                 aclcheck_error_type(ACLCHECK_NOT_OWNER, HeapTupleGetOid(tup));
2811 }
2812
2813 /*
2814  * domainAddConstraint - code shared between CREATE and ALTER DOMAIN
2815  */
2816 static char *
2817 domainAddConstraint(Oid domainOid, Oid domainNamespace, Oid baseTypeOid,
2818                                         int typMod, Constraint *constr,
2819                                         char *domainName)
2820 {
2821         Node       *expr;
2822         char       *ccsrc;
2823         char       *ccbin;
2824         ParseState *pstate;
2825         CoerceToDomainValue *domVal;
2826
2827         /*
2828          * Assign or validate constraint name
2829          */
2830         if (constr->conname)
2831         {
2832                 if (ConstraintNameIsUsed(CONSTRAINT_DOMAIN,
2833                                                                  domainOid,
2834                                                                  domainNamespace,
2835                                                                  constr->conname))
2836                         ereport(ERROR,
2837                                         (errcode(ERRCODE_DUPLICATE_OBJECT),
2838                                  errmsg("constraint \"%s\" for domain \"%s\" already exists",
2839                                                 constr->conname, domainName)));
2840         }
2841         else
2842                 constr->conname = ChooseConstraintName(domainName,
2843                                                                                            NULL,
2844                                                                                            "check",
2845                                                                                            domainNamespace,
2846                                                                                            NIL);
2847
2848         /*
2849          * Convert the A_EXPR in raw_expr into an EXPR
2850          */
2851         pstate = make_parsestate(NULL);
2852
2853         /*
2854          * Set up a CoerceToDomainValue to represent the occurrence of VALUE in
2855          * the expression.      Note that it will appear to have the type of the base
2856          * type, not the domain.  This seems correct since within the check
2857          * expression, we should not assume the input value can be considered a
2858          * member of the domain.
2859          */
2860         domVal = makeNode(CoerceToDomainValue);
2861         domVal->typeId = baseTypeOid;
2862         domVal->typeMod = typMod;
2863         domVal->collation = get_typcollation(baseTypeOid);
2864         domVal->location = -1;          /* will be set when/if used */
2865
2866         pstate->p_value_substitute = (Node *) domVal;
2867
2868         expr = transformExpr(pstate, constr->raw_expr);
2869
2870         /*
2871          * Make sure it yields a boolean result.
2872          */
2873         expr = coerce_to_boolean(pstate, expr, "CHECK");
2874
2875         /*
2876          * Fix up collation information.
2877          */
2878         assign_expr_collations(pstate, expr);
2879
2880         /*
2881          * Make sure no outside relations are referred to.
2882          */
2883         if (list_length(pstate->p_rtable) != 0)
2884                 ereport(ERROR,
2885                                 (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
2886                   errmsg("cannot use table references in domain check constraint")));
2887
2888         /*
2889          * Domains don't allow var clauses (this should be redundant with the
2890          * above check, but make it anyway)
2891          */
2892         if (contain_var_clause(expr))
2893                 ereport(ERROR,
2894                                 (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
2895                   errmsg("cannot use table references in domain check constraint")));
2896
2897         /*
2898          * No subplans or aggregates, either...
2899          */
2900         if (pstate->p_hasSubLinks)
2901                 ereport(ERROR,
2902                                 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2903                                  errmsg("cannot use subquery in check constraint")));
2904         if (pstate->p_hasAggs)
2905                 ereport(ERROR,
2906                                 (errcode(ERRCODE_GROUPING_ERROR),
2907                            errmsg("cannot use aggregate function in check constraint")));
2908         if (pstate->p_hasWindowFuncs)
2909                 ereport(ERROR,
2910                                 (errcode(ERRCODE_WINDOWING_ERROR),
2911                                  errmsg("cannot use window function in check constraint")));
2912
2913         /*
2914          * Convert to string form for storage.
2915          */
2916         ccbin = nodeToString(expr);
2917
2918         /*
2919          * Deparse it to produce text for consrc.
2920          *
2921          * Since VARNOs aren't allowed in domain constraints, relation context
2922          * isn't required as anything other than a shell.
2923          */
2924         ccsrc = deparse_expression(expr,
2925                                                            deparse_context_for(domainName,
2926                                                                                                    InvalidOid),
2927                                                            false, false);
2928
2929         /*
2930          * Store the constraint in pg_constraint
2931          */
2932         CreateConstraintEntry(constr->conname,          /* Constraint Name */
2933                                                   domainNamespace,              /* namespace */
2934                                                   CONSTRAINT_CHECK,             /* Constraint Type */
2935                                                   false,        /* Is Deferrable */
2936                                                   false,        /* Is Deferred */
2937                                                   !constr->skip_validation,             /* Is Validated */
2938                                                   InvalidOid,   /* not a relation constraint */
2939                                                   NULL,
2940                                                   0,
2941                                                   domainOid,    /* domain constraint */
2942                                                   InvalidOid,   /* no associated index */
2943                                                   InvalidOid,   /* Foreign key fields */
2944                                                   NULL,
2945                                                   NULL,
2946                                                   NULL,
2947                                                   NULL,
2948                                                   0,
2949                                                   ' ',
2950                                                   ' ',
2951                                                   ' ',
2952                                                   NULL, /* not an exclusion constraint */
2953                                                   expr, /* Tree form of check constraint */
2954                                                   ccbin,        /* Binary form of check constraint */
2955                                                   ccsrc,        /* Source form of check constraint */
2956                                                   true, /* is local */
2957                                                   0,    /* inhcount */
2958                                                   false);               /* is only */
2959
2960         /*
2961          * Return the compiled constraint expression so the calling routine can
2962          * perform any additional required tests.
2963          */
2964         return ccbin;
2965 }
2966
2967 /*
2968  * GetDomainConstraints - get a list of the current constraints of domain
2969  *
2970  * Returns a possibly-empty list of DomainConstraintState nodes.
2971  *
2972  * This is called by the executor during plan startup for a CoerceToDomain
2973  * expression node.  The given constraints will be checked for each value
2974  * passed through the node.
2975  *
2976  * We allow this to be called for non-domain types, in which case the result
2977  * is always NIL.
2978  */
2979 List *
2980 GetDomainConstraints(Oid typeOid)
2981 {
2982         List       *result = NIL;
2983         bool            notNull = false;
2984         Relation        conRel;
2985
2986         conRel = heap_open(ConstraintRelationId, AccessShareLock);
2987
2988         for (;;)
2989         {
2990                 HeapTuple       tup;
2991                 HeapTuple       conTup;
2992                 Form_pg_type typTup;
2993                 ScanKeyData key[1];
2994                 SysScanDesc scan;
2995
2996                 tup = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typeOid));
2997                 if (!HeapTupleIsValid(tup))
2998                         elog(ERROR, "cache lookup failed for type %u", typeOid);
2999                 typTup = (Form_pg_type) GETSTRUCT(tup);
3000
3001                 if (typTup->typtype != TYPTYPE_DOMAIN)
3002                 {
3003                         /* Not a domain, so done */
3004                         ReleaseSysCache(tup);
3005                         break;
3006                 }
3007
3008                 /* Test for NOT NULL Constraint */
3009                 if (typTup->typnotnull)
3010                         notNull = true;
3011
3012                 /* Look for CHECK Constraints on this domain */
3013                 ScanKeyInit(&key[0],
3014                                         Anum_pg_constraint_contypid,
3015                                         BTEqualStrategyNumber, F_OIDEQ,
3016                                         ObjectIdGetDatum(typeOid));
3017
3018                 scan = systable_beginscan(conRel, ConstraintTypidIndexId, true,
3019                                                                   SnapshotNow, 1, key);
3020
3021                 while (HeapTupleIsValid(conTup = systable_getnext(scan)))
3022                 {
3023                         Form_pg_constraint c = (Form_pg_constraint) GETSTRUCT(conTup);
3024                         Datum           val;
3025                         bool            isNull;
3026                         Expr       *check_expr;
3027                         DomainConstraintState *r;
3028
3029                         /* Ignore non-CHECK constraints (presently, shouldn't be any) */
3030                         if (c->contype != CONSTRAINT_CHECK)
3031                                 continue;
3032
3033                         /*
3034                          * Not expecting conbin to be NULL, but we'll test for it anyway
3035                          */
3036                         val = fastgetattr(conTup, Anum_pg_constraint_conbin,
3037                                                           conRel->rd_att, &isNull);
3038                         if (isNull)
3039                                 elog(ERROR, "domain \"%s\" constraint \"%s\" has NULL conbin",
3040                                          NameStr(typTup->typname), NameStr(c->conname));
3041
3042                         check_expr = (Expr *) stringToNode(TextDatumGetCString(val));
3043
3044                         /* ExecInitExpr assumes we've planned the expression */
3045                         check_expr = expression_planner(check_expr);
3046
3047                         r = makeNode(DomainConstraintState);
3048                         r->constrainttype = DOM_CONSTRAINT_CHECK;
3049                         r->name = pstrdup(NameStr(c->conname));
3050                         r->check_expr = ExecInitExpr(check_expr, NULL);
3051
3052                         /*
3053                          * use lcons() here because constraints of lower domains should be
3054                          * applied earlier.
3055                          */
3056                         result = lcons(r, result);
3057                 }
3058
3059                 systable_endscan(scan);
3060
3061                 /* loop to next domain in stack */
3062                 typeOid = typTup->typbasetype;
3063                 ReleaseSysCache(tup);
3064         }
3065
3066         heap_close(conRel, AccessShareLock);
3067
3068         /*
3069          * Only need to add one NOT NULL check regardless of how many domains in
3070          * the stack request it.
3071          */
3072         if (notNull)
3073         {
3074                 DomainConstraintState *r = makeNode(DomainConstraintState);
3075
3076                 r->constrainttype = DOM_CONSTRAINT_NOTNULL;
3077                 r->name = pstrdup("NOT NULL");
3078                 r->check_expr = NULL;
3079
3080                 /* lcons to apply the nullness check FIRST */
3081                 result = lcons(r, result);
3082         }
3083
3084         return result;
3085 }
3086
3087
3088 /*
3089  * Execute ALTER TYPE RENAME
3090  */
3091 void
3092 RenameType(RenameStmt *stmt)
3093 {
3094         List       *names = stmt->object;
3095         const char *newTypeName = stmt->newname;
3096         TypeName   *typename;
3097         Oid                     typeOid;
3098         Relation        rel;
3099         HeapTuple       tup;
3100         Form_pg_type typTup;
3101
3102         /* Make a TypeName so we can use standard type lookup machinery */
3103         typename = makeTypeNameFromNameList(names);
3104         typeOid = typenameTypeId(NULL, typename);
3105
3106         /* Look up the type in the type table */
3107         rel = heap_open(TypeRelationId, RowExclusiveLock);
3108
3109         tup = SearchSysCacheCopy1(TYPEOID, ObjectIdGetDatum(typeOid));
3110         if (!HeapTupleIsValid(tup))
3111                 elog(ERROR, "cache lookup failed for type %u", typeOid);
3112         typTup = (Form_pg_type) GETSTRUCT(tup);
3113
3114         /* check permissions on type */
3115         if (!pg_type_ownercheck(typeOid, GetUserId()))
3116                 aclcheck_error_type(ACLCHECK_NOT_OWNER, typeOid);
3117
3118         /* ALTER DOMAIN used on a non-domain? */
3119         if (stmt->renameType == OBJECT_DOMAIN && typTup->typtype != TYPTYPE_DOMAIN)
3120                 ereport(ERROR,
3121                                 (errcode(ERRCODE_WRONG_OBJECT_TYPE),
3122                                  errmsg("\"%s\" is not a domain",
3123                                                 format_type_be(typeOid))));
3124
3125         /*
3126          * If it's a composite type, we need to check that it really is a
3127          * free-standing composite type, and not a table's rowtype. We want people
3128          * to use ALTER TABLE not ALTER TYPE for that case.
3129          */
3130         if (typTup->typtype == TYPTYPE_COMPOSITE &&
3131                 get_rel_relkind(typTup->typrelid) != RELKIND_COMPOSITE_TYPE)
3132                 ereport(ERROR,
3133                                 (errcode(ERRCODE_WRONG_OBJECT_TYPE),
3134                                  errmsg("%s is a table's row type",
3135                                                 format_type_be(typeOid)),
3136                                  errhint("Use ALTER TABLE instead.")));
3137
3138         /* don't allow direct alteration of array types, either */
3139         if (OidIsValid(typTup->typelem) &&
3140                 get_array_type(typTup->typelem) == typeOid)
3141                 ereport(ERROR,
3142                                 (errcode(ERRCODE_WRONG_OBJECT_TYPE),
3143                                  errmsg("cannot alter array type %s",
3144                                                 format_type_be(typeOid)),
3145                                  errhint("You can alter type %s, which will alter the array type as well.",
3146                                                  format_type_be(typTup->typelem))));
3147
3148         /*
3149          * If type is composite we need to rename associated pg_class entry too.
3150          * RenameRelationInternal will call RenameTypeInternal automatically.
3151          */
3152         if (typTup->typtype == TYPTYPE_COMPOSITE)
3153                 RenameRelationInternal(typTup->typrelid, newTypeName);
3154         else
3155                 RenameTypeInternal(typeOid, newTypeName,
3156                                                    typTup->typnamespace);
3157
3158         /* Clean up */
3159         heap_close(rel, RowExclusiveLock);
3160 }
3161
3162 /*
3163  * Change the owner of a type.
3164  */
3165 void
3166 AlterTypeOwner(List *names, Oid newOwnerId, ObjectType objecttype)
3167 {
3168         TypeName   *typename;
3169         Oid                     typeOid;
3170         Relation        rel;
3171         HeapTuple       tup;
3172         HeapTuple       newtup;
3173         Form_pg_type typTup;
3174         AclResult       aclresult;
3175
3176         rel = heap_open(TypeRelationId, RowExclusiveLock);
3177
3178         /* Make a TypeName so we can use standard type lookup machinery */
3179         typename = makeTypeNameFromNameList(names);
3180
3181         /* Use LookupTypeName here so that shell types can be processed */
3182         tup = LookupTypeName(NULL, typename, NULL);
3183         if (tup == NULL)
3184                 ereport(ERROR,
3185                                 (errcode(ERRCODE_UNDEFINED_OBJECT),
3186                                  errmsg("type \"%s\" does not exist",
3187                                                 TypeNameToString(typename))));
3188         typeOid = typeTypeId(tup);
3189
3190         /* Copy the syscache entry so we can scribble on it below */
3191         newtup = heap_copytuple(tup);
3192         ReleaseSysCache(tup);
3193         tup = newtup;
3194         typTup = (Form_pg_type) GETSTRUCT(tup);
3195
3196         /* Don't allow ALTER DOMAIN on a type */
3197         if (objecttype == OBJECT_DOMAIN && typTup->typtype != TYPTYPE_DOMAIN)
3198                 ereport(ERROR,
3199                                 (errcode(ERRCODE_WRONG_OBJECT_TYPE),
3200                                  errmsg("%s is not a domain",
3201                                                 format_type_be(typeOid))));
3202
3203         /*
3204          * If it's a composite type, we need to check that it really is a
3205          * free-standing composite type, and not a table's rowtype. We want people
3206          * to use ALTER TABLE not ALTER TYPE for that case.
3207          */
3208         if (typTup->typtype == TYPTYPE_COMPOSITE &&
3209                 get_rel_relkind(typTup->typrelid) != RELKIND_COMPOSITE_TYPE)
3210                 ereport(ERROR,
3211                                 (errcode(ERRCODE_WRONG_OBJECT_TYPE),
3212                                  errmsg("%s is a table's row type",
3213                                                 format_type_be(typeOid)),
3214                                  errhint("Use ALTER TABLE instead.")));
3215
3216         /* don't allow direct alteration of array types, either */
3217         if (OidIsValid(typTup->typelem) &&
3218                 get_array_type(typTup->typelem) == typeOid)
3219                 ereport(ERROR,
3220                                 (errcode(ERRCODE_WRONG_OBJECT_TYPE),
3221                                  errmsg("cannot alter array type %s",
3222                                                 format_type_be(typeOid)),
3223                                  errhint("You can alter type %s, which will alter the array type as well.",
3224                                                  format_type_be(typTup->typelem))));
3225
3226         /*
3227          * If the new owner is the same as the existing owner, consider the
3228          * command to have succeeded.  This is for dump restoration purposes.
3229          */
3230         if (typTup->typowner != newOwnerId)
3231         {
3232                 /* Superusers can always do it */
3233                 if (!superuser())
3234                 {
3235                         /* Otherwise, must be owner of the existing object */
3236                         if (!pg_type_ownercheck(HeapTupleGetOid(tup), GetUserId()))
3237                                 aclcheck_error_type(ACLCHECK_NOT_OWNER, HeapTupleGetOid(tup));
3238
3239                         /* Must be able to become new owner */
3240                         check_is_member_of_role(GetUserId(), newOwnerId);
3241
3242                         /* New owner must have CREATE privilege on namespace */
3243                         aclresult = pg_namespace_aclcheck(typTup->typnamespace,
3244                                                                                           newOwnerId,
3245                                                                                           ACL_CREATE);
3246                         if (aclresult != ACLCHECK_OK)
3247                                 aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
3248                                                            get_namespace_name(typTup->typnamespace));
3249                 }
3250
3251                 /*
3252                  * If it's a composite type, invoke ATExecChangeOwner so that we fix
3253                  * up the pg_class entry properly.      That will call back to
3254                  * AlterTypeOwnerInternal to take care of the pg_type entry(s).
3255                  */
3256                 if (typTup->typtype == TYPTYPE_COMPOSITE)
3257                         ATExecChangeOwner(typTup->typrelid, newOwnerId, true, AccessExclusiveLock);
3258                 else
3259                 {
3260                         /*
3261                          * We can just apply the modification directly.
3262                          *
3263                          * okay to scribble on typTup because it's a copy
3264                          */
3265                         typTup->typowner = newOwnerId;
3266
3267                         simple_heap_update(rel, &tup->t_self, tup);
3268
3269                         CatalogUpdateIndexes(rel, tup);
3270
3271                         /* Update owner dependency reference */
3272                         changeDependencyOnOwner(TypeRelationId, typeOid, newOwnerId);
3273
3274                         /* If it has an array type, update that too */
3275                         if (OidIsValid(typTup->typarray))
3276                                 AlterTypeOwnerInternal(typTup->typarray, newOwnerId, false);
3277                 }
3278         }
3279
3280         /* Clean up */
3281         heap_close(rel, RowExclusiveLock);
3282 }
3283
3284 /*
3285  * AlterTypeOwnerInternal - change type owner unconditionally
3286  *
3287  * This is currently only used to propagate ALTER TABLE/TYPE OWNER to a
3288  * table's rowtype or an array type, and to implement REASSIGN OWNED BY.
3289  * It assumes the caller has done all needed checks.  The function will
3290  * automatically recurse to an array type if the type has one.
3291  *
3292  * hasDependEntry should be TRUE if type is expected to have a pg_shdepend
3293  * entry (ie, it's not a table rowtype nor an array type).
3294  */
3295 void
3296 AlterTypeOwnerInternal(Oid typeOid, Oid newOwnerId,
3297                                            bool hasDependEntry)
3298 {
3299         Relation        rel;
3300         HeapTuple       tup;
3301         Form_pg_type typTup;
3302
3303         rel = heap_open(TypeRelationId, RowExclusiveLock);
3304
3305         tup = SearchSysCacheCopy1(TYPEOID, ObjectIdGetDatum(typeOid));
3306         if (!HeapTupleIsValid(tup))
3307                 elog(ERROR, "cache lookup failed for type %u", typeOid);
3308         typTup = (Form_pg_type) GETSTRUCT(tup);
3309
3310         /*
3311          * Modify the owner --- okay to scribble on typTup because it's a copy
3312          */
3313         typTup->typowner = newOwnerId;
3314
3315         simple_heap_update(rel, &tup->t_self, tup);
3316
3317         CatalogUpdateIndexes(rel, tup);
3318
3319         /* Update owner dependency reference, if it has one */
3320         if (hasDependEntry)
3321                 changeDependencyOnOwner(TypeRelationId, typeOid, newOwnerId);
3322
3323         /* If it has an array type, update that too */
3324         if (OidIsValid(typTup->typarray))
3325                 AlterTypeOwnerInternal(typTup->typarray, newOwnerId, false);
3326
3327         /* Clean up */
3328         heap_close(rel, RowExclusiveLock);
3329 }
3330
3331 /*
3332  * Execute ALTER TYPE SET SCHEMA
3333  */
3334 void
3335 AlterTypeNamespace(List *names, const char *newschema, ObjectType objecttype)
3336 {
3337         TypeName   *typename;
3338         Oid                     typeOid;
3339         Oid                     nspOid;
3340
3341         /* Make a TypeName so we can use standard type lookup machinery */
3342         typename = makeTypeNameFromNameList(names);
3343         typeOid = typenameTypeId(NULL, typename);
3344
3345         /* Don't allow ALTER DOMAIN on a type */
3346         if (objecttype == OBJECT_DOMAIN && get_typtype(typeOid) != TYPTYPE_DOMAIN)
3347                 ereport(ERROR,
3348                                 (errcode(ERRCODE_WRONG_OBJECT_TYPE),
3349                                  errmsg("%s is not a domain",
3350                                                 format_type_be(typeOid))));
3351
3352         /* get schema OID and check its permissions */
3353         nspOid = LookupCreationNamespace(newschema);
3354
3355         AlterTypeNamespace_oid(typeOid, nspOid);
3356 }
3357
3358 Oid
3359 AlterTypeNamespace_oid(Oid typeOid, Oid nspOid)
3360 {
3361         Oid                     elemOid;
3362
3363         /* check permissions on type */
3364         if (!pg_type_ownercheck(typeOid, GetUserId()))
3365                 aclcheck_error_type(ACLCHECK_NOT_OWNER, typeOid);
3366
3367         /* don't allow direct alteration of array types */
3368         elemOid = get_element_type(typeOid);
3369         if (OidIsValid(elemOid) && get_array_type(elemOid) == typeOid)
3370                 ereport(ERROR,
3371                                 (errcode(ERRCODE_WRONG_OBJECT_TYPE),
3372                                  errmsg("cannot alter array type %s",
3373                                                 format_type_be(typeOid)),
3374                                  errhint("You can alter type %s, which will alter the array type as well.",
3375                                                  format_type_be(elemOid))));
3376
3377         /* and do the work */
3378         return AlterTypeNamespaceInternal(typeOid, nspOid, false, true);
3379 }
3380
3381 /*
3382  * Move specified type to new namespace.
3383  *
3384  * Caller must have already checked privileges.
3385  *
3386  * The function automatically recurses to process the type's array type,
3387  * if any.      isImplicitArray should be TRUE only when doing this internal
3388  * recursion (outside callers must never try to move an array type directly).
3389  *
3390  * If errorOnTableType is TRUE, the function errors out if the type is
3391  * a table type.  ALTER TABLE has to be used to move a table to a new
3392  * namespace.
3393  *
3394  * Returns the type's old namespace OID.
3395  */
3396 Oid
3397 AlterTypeNamespaceInternal(Oid typeOid, Oid nspOid,
3398                                                    bool isImplicitArray,
3399                                                    bool errorOnTableType)
3400 {
3401         Relation        rel;
3402         HeapTuple       tup;
3403         Form_pg_type typform;
3404         Oid                     oldNspOid;
3405         Oid                     arrayOid;
3406         bool            isCompositeType;
3407
3408         rel = heap_open(TypeRelationId, RowExclusiveLock);
3409
3410         tup = SearchSysCacheCopy1(TYPEOID, ObjectIdGetDatum(typeOid));
3411         if (!HeapTupleIsValid(tup))
3412                 elog(ERROR, "cache lookup failed for type %u", typeOid);
3413         typform = (Form_pg_type) GETSTRUCT(tup);
3414
3415         oldNspOid = typform->typnamespace;
3416         arrayOid = typform->typarray;
3417
3418         /* common checks on switching namespaces */
3419         CheckSetNamespace(oldNspOid, nspOid, TypeRelationId, typeOid);
3420
3421         /* check for duplicate name (more friendly than unique-index failure) */
3422         if (SearchSysCacheExists2(TYPENAMENSP,
3423                                                           CStringGetDatum(NameStr(typform->typname)),
3424                                                           ObjectIdGetDatum(nspOid)))
3425                 ereport(ERROR,
3426                                 (errcode(ERRCODE_DUPLICATE_OBJECT),
3427                                  errmsg("type \"%s\" already exists in schema \"%s\"",
3428                                                 NameStr(typform->typname),
3429                                                 get_namespace_name(nspOid))));
3430
3431         /* Detect whether type is a composite type (but not a table rowtype) */
3432         isCompositeType =
3433                 (typform->typtype == TYPTYPE_COMPOSITE &&
3434                  get_rel_relkind(typform->typrelid) == RELKIND_COMPOSITE_TYPE);
3435
3436         /* Enforce not-table-type if requested */
3437         if (typform->typtype == TYPTYPE_COMPOSITE && !isCompositeType &&
3438                 errorOnTableType)
3439                 ereport(ERROR,
3440                                 (errcode(ERRCODE_WRONG_OBJECT_TYPE),
3441                                  errmsg("%s is a table's row type",
3442                                                 format_type_be(typeOid)),
3443                                  errhint("Use ALTER TABLE instead.")));
3444
3445         /* OK, modify the pg_type row */
3446
3447         /* tup is a copy, so we can scribble directly on it */
3448         typform->typnamespace = nspOid;
3449
3450         simple_heap_update(rel, &tup->t_self, tup);
3451         CatalogUpdateIndexes(rel, tup);
3452
3453         /*
3454          * Composite types have pg_class entries.
3455          *
3456          * We need to modify the pg_class tuple as well to reflect the change of
3457          * schema.
3458          */
3459         if (isCompositeType)
3460         {
3461                 Relation        classRel;
3462
3463                 classRel = heap_open(RelationRelationId, RowExclusiveLock);
3464
3465                 AlterRelationNamespaceInternal(classRel, typform->typrelid,
3466                                                                            oldNspOid, nspOid,
3467                                                                            false);
3468
3469                 heap_close(classRel, RowExclusiveLock);
3470
3471                 /*
3472                  * Check for constraints associated with the composite type (we don't
3473                  * currently support this, but probably will someday).
3474                  */
3475                 AlterConstraintNamespaces(typform->typrelid, oldNspOid,
3476                                                                   nspOid, false);
3477         }
3478         else
3479         {
3480                 /* If it's a domain, it might have constraints */
3481                 if (typform->typtype == TYPTYPE_DOMAIN)
3482                         AlterConstraintNamespaces(typeOid, oldNspOid, nspOid, true);
3483         }
3484
3485         /*
3486          * Update dependency on schema, if any --- a table rowtype has not got
3487          * one, and neither does an implicit array.
3488          */
3489         if ((isCompositeType || typform->typtype != TYPTYPE_COMPOSITE) &&
3490                 !isImplicitArray)
3491                 if (changeDependencyFor(TypeRelationId, typeOid,
3492                                                                 NamespaceRelationId, oldNspOid, nspOid) != 1)
3493                         elog(ERROR, "failed to change schema dependency for type %s",
3494                                  format_type_be(typeOid));
3495
3496         heap_freetuple(tup);
3497
3498         heap_close(rel, RowExclusiveLock);
3499
3500         /* Recursively alter the associated array type, if any */
3501         if (OidIsValid(arrayOid))
3502                 AlterTypeNamespaceInternal(arrayOid, nspOid, true, true);
3503
3504         return oldNspOid;
3505 }