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parse_coerce.h File Reference
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Typedefs

typedef char TYPCATEGORY
 
typedef enum CoercionPathType CoercionPathType
 

Enumerations

enum  CoercionPathType {
  COERCION_PATH_NONE, COERCION_PATH_FUNC, COERCION_PATH_RELABELTYPE, COERCION_PATH_ARRAYCOERCE,
  COERCION_PATH_COERCEVIAIO
}
 

Functions

bool IsBinaryCoercible (Oid srctype, Oid targettype)
 
bool IsPreferredType (TYPCATEGORY category, Oid type)
 
TYPCATEGORY TypeCategory (Oid type)
 
Nodecoerce_to_target_type (ParseState *pstate, Node *expr, Oid exprtype, Oid targettype, int32 targettypmod, CoercionContext ccontext, CoercionForm cformat, int location)
 
bool can_coerce_type (int nargs, const Oid *input_typeids, const Oid *target_typeids, CoercionContext ccontext)
 
Nodecoerce_type (ParseState *pstate, Node *node, Oid inputTypeId, Oid targetTypeId, int32 targetTypeMod, CoercionContext ccontext, CoercionForm cformat, int location)
 
Nodecoerce_to_domain (Node *arg, Oid baseTypeId, int32 baseTypeMod, Oid typeId, CoercionContext ccontext, CoercionForm cformat, int location, bool hideInputCoercion)
 
Nodecoerce_to_boolean (ParseState *pstate, Node *node, const char *constructName)
 
Nodecoerce_to_specific_type (ParseState *pstate, Node *node, Oid targetTypeId, const char *constructName)
 
Nodecoerce_to_specific_type_typmod (ParseState *pstate, Node *node, Oid targetTypeId, int32 targetTypmod, const char *constructName)
 
int parser_coercion_errposition (ParseState *pstate, int coerce_location, Node *input_expr)
 
Oid select_common_type (ParseState *pstate, List *exprs, const char *context, Node **which_expr)
 
Nodecoerce_to_common_type (ParseState *pstate, Node *node, Oid targetTypeId, const char *context)
 
bool check_generic_type_consistency (const Oid *actual_arg_types, const Oid *declared_arg_types, int nargs)
 
Oid enforce_generic_type_consistency (const Oid *actual_arg_types, Oid *declared_arg_types, int nargs, Oid rettype, bool allow_poly)
 
Oid resolve_generic_type (Oid declared_type, Oid context_actual_type, Oid context_declared_type)
 
CoercionPathType find_coercion_pathway (Oid targetTypeId, Oid sourceTypeId, CoercionContext ccontext, Oid *funcid)
 
CoercionPathType find_typmod_coercion_function (Oid typeId, Oid *funcid)
 

Typedef Documentation

◆ CoercionPathType

◆ TYPCATEGORY

typedef char TYPCATEGORY

Definition at line 21 of file parse_coerce.h.

Enumeration Type Documentation

◆ CoercionPathType

Enumerator
COERCION_PATH_NONE 
COERCION_PATH_FUNC 
COERCION_PATH_RELABELTYPE 
COERCION_PATH_ARRAYCOERCE 
COERCION_PATH_COERCEVIAIO 

Definition at line 24 of file parse_coerce.h.

25 {
26  COERCION_PATH_NONE, /* failed to find any coercion pathway */
27  COERCION_PATH_FUNC, /* apply the specified coercion function */
28  COERCION_PATH_RELABELTYPE, /* binary-compatible cast, no function */
29  COERCION_PATH_ARRAYCOERCE, /* need an ArrayCoerceExpr node */
30  COERCION_PATH_COERCEVIAIO /* need a CoerceViaIO node */
CoercionPathType
Definition: parse_coerce.h:24

Function Documentation

◆ can_coerce_type()

bool can_coerce_type ( int  nargs,
const Oid input_typeids,
const Oid target_typeids,
CoercionContext  ccontext 
)

Definition at line 543 of file parse_coerce.c.

References check_generic_type_consistency(), COERCION_PATH_NONE, find_coercion_pathway(), i, is_complex_array(), ISCOMPLEX, typeInheritsFrom(), and typeIsOfTypedTable().

Referenced by ATAddForeignKeyConstraint(), coerce_to_common_type(), coerce_to_target_type(), func_match_argtypes(), func_select_candidate(), select_common_type(), and transformFrameOffset().

545 {
546  bool have_generics = false;
547  int i;
548 
549  /* run through argument list... */
550  for (i = 0; i < nargs; i++)
551  {
552  Oid inputTypeId = input_typeids[i];
553  Oid targetTypeId = target_typeids[i];
554  CoercionPathType pathtype;
555  Oid funcId;
556 
557  /* no problem if same type */
558  if (inputTypeId == targetTypeId)
559  continue;
560 
561  /* accept if target is ANY */
562  if (targetTypeId == ANYOID)
563  continue;
564 
565  /* accept if target is polymorphic, for now */
566  if (IsPolymorphicType(targetTypeId))
567  {
568  have_generics = true; /* do more checking later */
569  continue;
570  }
571 
572  /*
573  * If input is an untyped string constant, assume we can convert it to
574  * anything.
575  */
576  if (inputTypeId == UNKNOWNOID)
577  continue;
578 
579  /*
580  * If pg_cast shows that we can coerce, accept. This test now covers
581  * both binary-compatible and coercion-function cases.
582  */
583  pathtype = find_coercion_pathway(targetTypeId, inputTypeId, ccontext,
584  &funcId);
585  if (pathtype != COERCION_PATH_NONE)
586  continue;
587 
588  /*
589  * If input is RECORD and target is a composite type, assume we can
590  * coerce (may need tighter checking here)
591  */
592  if (inputTypeId == RECORDOID &&
593  ISCOMPLEX(targetTypeId))
594  continue;
595 
596  /*
597  * If input is a composite type and target is RECORD, accept
598  */
599  if (targetTypeId == RECORDOID &&
600  ISCOMPLEX(inputTypeId))
601  continue;
602 
603 #ifdef NOT_USED /* not implemented yet */
604 
605  /*
606  * If input is record[] and target is a composite array type, assume
607  * we can coerce (may need tighter checking here)
608  */
609  if (inputTypeId == RECORDARRAYOID &&
610  is_complex_array(targetTypeId))
611  continue;
612 #endif
613 
614  /*
615  * If input is a composite array type and target is record[], accept
616  */
617  if (targetTypeId == RECORDARRAYOID &&
618  is_complex_array(inputTypeId))
619  continue;
620 
621  /*
622  * If input is a class type that inherits from target, accept
623  */
624  if (typeInheritsFrom(inputTypeId, targetTypeId)
625  || typeIsOfTypedTable(inputTypeId, targetTypeId))
626  continue;
627 
628  /*
629  * Else, cannot coerce at this argument position
630  */
631  return false;
632  }
633 
634  /* If we found any generic argument types, cross-check them */
635  if (have_generics)
636  {
637  if (!check_generic_type_consistency(input_typeids, target_typeids,
638  nargs))
639  return false;
640  }
641 
642  return true;
643 }
bool check_generic_type_consistency(const Oid *actual_arg_types, const Oid *declared_arg_types, int nargs)
unsigned int Oid
Definition: postgres_ext.h:31
CoercionPathType
Definition: parse_coerce.h:24
bool typeInheritsFrom(Oid subclassTypeId, Oid superclassTypeId)
Definition: pg_inherits.c:315
#define ISCOMPLEX(typeid)
Definition: parse_type.h:58
static bool typeIsOfTypedTable(Oid reltypeId, Oid reloftypeId)
CoercionPathType find_coercion_pathway(Oid targetTypeId, Oid sourceTypeId, CoercionContext ccontext, Oid *funcid)
int i
static bool is_complex_array(Oid typid)

◆ check_generic_type_consistency()

bool check_generic_type_consistency ( const Oid actual_arg_types,
const Oid declared_arg_types,
int  nargs 
)

Definition at line 1475 of file parse_coerce.c.

References get_element_type(), get_range_subtype(), getBaseType(), InvalidOid, OidIsValid, type_is_array_domain, and type_is_enum().

Referenced by can_coerce_type().

1478 {
1479  int j;
1480  Oid elem_typeid = InvalidOid;
1481  Oid array_typeid = InvalidOid;
1482  Oid array_typelem;
1483  Oid range_typeid = InvalidOid;
1484  Oid range_typelem;
1485  bool have_anyelement = false;
1486  bool have_anynonarray = false;
1487  bool have_anyenum = false;
1488 
1489  /*
1490  * Loop through the arguments to see if we have any that are polymorphic.
1491  * If so, require the actual types to be consistent.
1492  */
1493  for (j = 0; j < nargs; j++)
1494  {
1495  Oid decl_type = declared_arg_types[j];
1496  Oid actual_type = actual_arg_types[j];
1497 
1498  if (decl_type == ANYELEMENTOID ||
1499  decl_type == ANYNONARRAYOID ||
1500  decl_type == ANYENUMOID)
1501  {
1502  have_anyelement = true;
1503  if (decl_type == ANYNONARRAYOID)
1504  have_anynonarray = true;
1505  else if (decl_type == ANYENUMOID)
1506  have_anyenum = true;
1507  if (actual_type == UNKNOWNOID)
1508  continue;
1509  if (OidIsValid(elem_typeid) && actual_type != elem_typeid)
1510  return false;
1511  elem_typeid = actual_type;
1512  }
1513  else if (decl_type == ANYARRAYOID)
1514  {
1515  if (actual_type == UNKNOWNOID)
1516  continue;
1517  actual_type = getBaseType(actual_type); /* flatten domains */
1518  if (OidIsValid(array_typeid) && actual_type != array_typeid)
1519  return false;
1520  array_typeid = actual_type;
1521  }
1522  else if (decl_type == ANYRANGEOID)
1523  {
1524  if (actual_type == UNKNOWNOID)
1525  continue;
1526  actual_type = getBaseType(actual_type); /* flatten domains */
1527  if (OidIsValid(range_typeid) && actual_type != range_typeid)
1528  return false;
1529  range_typeid = actual_type;
1530  }
1531  }
1532 
1533  /* Get the element type based on the array type, if we have one */
1534  if (OidIsValid(array_typeid))
1535  {
1536  if (array_typeid == ANYARRAYOID)
1537  {
1538  /* Special case for ANYARRAY input: okay iff no ANYELEMENT */
1539  if (have_anyelement)
1540  return false;
1541  return true;
1542  }
1543 
1544  array_typelem = get_element_type(array_typeid);
1545  if (!OidIsValid(array_typelem))
1546  return false; /* should be an array, but isn't */
1547 
1548  if (!OidIsValid(elem_typeid))
1549  {
1550  /*
1551  * if we don't have an element type yet, use the one we just got
1552  */
1553  elem_typeid = array_typelem;
1554  }
1555  else if (array_typelem != elem_typeid)
1556  {
1557  /* otherwise, they better match */
1558  return false;
1559  }
1560  }
1561 
1562  /* Get the element type based on the range type, if we have one */
1563  if (OidIsValid(range_typeid))
1564  {
1565  range_typelem = get_range_subtype(range_typeid);
1566  if (!OidIsValid(range_typelem))
1567  return false; /* should be a range, but isn't */
1568 
1569  if (!OidIsValid(elem_typeid))
1570  {
1571  /*
1572  * if we don't have an element type yet, use the one we just got
1573  */
1574  elem_typeid = range_typelem;
1575  }
1576  else if (range_typelem != elem_typeid)
1577  {
1578  /* otherwise, they better match */
1579  return false;
1580  }
1581  }
1582 
1583  if (have_anynonarray)
1584  {
1585  /* require the element type to not be an array or domain over array */
1586  if (type_is_array_domain(elem_typeid))
1587  return false;
1588  }
1589 
1590  if (have_anyenum)
1591  {
1592  /* require the element type to be an enum */
1593  if (!type_is_enum(elem_typeid))
1594  return false;
1595  }
1596 
1597  /* Looks valid */
1598  return true;
1599 }
#define type_is_array_domain(typid)
Definition: lsyscache.h:186
Oid get_element_type(Oid typid)
Definition: lsyscache.c:2526
unsigned int Oid
Definition: postgres_ext.h:31
#define OidIsValid(objectId)
Definition: c.h:638
#define InvalidOid
Definition: postgres_ext.h:36
bool type_is_enum(Oid typid)
Definition: lsyscache.c:2456
Oid getBaseType(Oid typid)
Definition: lsyscache.c:2299
Oid get_range_subtype(Oid rangeOid)
Definition: lsyscache.c:3135

◆ coerce_to_boolean()

Node* coerce_to_boolean ( ParseState pstate,
Node node,
const char *  constructName 
)

Definition at line 1133 of file parse_coerce.c.

References COERCE_IMPLICIT_CAST, coerce_to_target_type(), COERCION_ASSIGNMENT, ereport, errcode(), errmsg(), ERROR, expression_returns_set(), exprLocation(), exprType(), format_type_be(), and parser_errposition().

Referenced by cookConstraint(), DoCopy(), domainAddConstraint(), transformAExprIn(), transformBooleanTest(), transformBoolExpr(), transformCaseExpr(), transformJoinUsingClause(), transformWhereClause(), and transformXmlExpr().

1135 {
1136  Oid inputTypeId = exprType(node);
1137 
1138  if (inputTypeId != BOOLOID)
1139  {
1140  Node *newnode;
1141 
1142  newnode = coerce_to_target_type(pstate, node, inputTypeId,
1143  BOOLOID, -1,
1146  -1);
1147  if (newnode == NULL)
1148  ereport(ERROR,
1149  (errcode(ERRCODE_DATATYPE_MISMATCH),
1150  /* translator: first %s is name of a SQL construct, eg WHERE */
1151  errmsg("argument of %s must be type %s, not type %s",
1152  constructName, "boolean",
1153  format_type_be(inputTypeId)),
1154  parser_errposition(pstate, exprLocation(node))));
1155  node = newnode;
1156  }
1157 
1158  if (expression_returns_set(node))
1159  ereport(ERROR,
1160  (errcode(ERRCODE_DATATYPE_MISMATCH),
1161  /* translator: %s is name of a SQL construct, eg WHERE */
1162  errmsg("argument of %s must not return a set",
1163  constructName),
1164  parser_errposition(pstate, exprLocation(node))));
1165 
1166  return node;
1167 }
int exprLocation(const Node *expr)
Definition: nodeFuncs.c:1192
bool expression_returns_set(Node *clause)
Definition: nodeFuncs.c:670
Definition: nodes.h:525
int errcode(int sqlerrcode)
Definition: elog.c:570
char * format_type_be(Oid type_oid)
Definition: format_type.c:326
unsigned int Oid
Definition: postgres_ext.h:31
#define ERROR
Definition: elog.h:43
Node * coerce_to_target_type(ParseState *pstate, Node *expr, Oid exprtype, Oid targettype, int32 targettypmod, CoercionContext ccontext, CoercionForm cformat, int location)
Definition: parse_coerce.c:78
#define ereport(elevel, rest)
Definition: elog.h:141
Oid exprType(const Node *expr)
Definition: nodeFuncs.c:42
int parser_errposition(ParseState *pstate, int location)
Definition: parse_node.c:111
int errmsg(const char *fmt,...)
Definition: elog.c:784

◆ coerce_to_common_type()

Node* coerce_to_common_type ( ParseState pstate,
Node node,
Oid  targetTypeId,
const char *  context 
)

Definition at line 1404 of file parse_coerce.c.

References can_coerce_type(), COERCE_IMPLICIT_CAST, coerce_type(), COERCION_IMPLICIT, ereport, errcode(), errmsg(), ERROR, exprLocation(), exprType(), format_type_be(), and parser_errposition().

Referenced by generate_setop_tlist(), transformAExprIn(), transformArrayExpr(), transformCaseExpr(), transformCoalesceExpr(), transformMinMaxExpr(), transformSetOperationTree(), and transformValuesClause().

1406 {
1407  Oid inputTypeId = exprType(node);
1408 
1409  if (inputTypeId == targetTypeId)
1410  return node; /* no work */
1411  if (can_coerce_type(1, &inputTypeId, &targetTypeId, COERCION_IMPLICIT))
1412  node = coerce_type(pstate, node, inputTypeId, targetTypeId, -1,
1414  else
1415  ereport(ERROR,
1416  (errcode(ERRCODE_CANNOT_COERCE),
1417  /* translator: first %s is name of a SQL construct, eg CASE */
1418  errmsg("%s could not convert type %s to %s",
1419  context,
1420  format_type_be(inputTypeId),
1421  format_type_be(targetTypeId)),
1422  parser_errposition(pstate, exprLocation(node))));
1423  return node;
1424 }
int exprLocation(const Node *expr)
Definition: nodeFuncs.c:1192
bool can_coerce_type(int nargs, const Oid *input_typeids, const Oid *target_typeids, CoercionContext ccontext)
Definition: parse_coerce.c:543
Node * coerce_type(ParseState *pstate, Node *node, Oid inputTypeId, Oid targetTypeId, int32 targetTypeMod, CoercionContext ccontext, CoercionForm cformat, int location)
Definition: parse_coerce.c:156
int errcode(int sqlerrcode)
Definition: elog.c:570
char * format_type_be(Oid type_oid)
Definition: format_type.c:326
unsigned int Oid
Definition: postgres_ext.h:31
#define ERROR
Definition: elog.h:43
#define ereport(elevel, rest)
Definition: elog.h:141
Oid exprType(const Node *expr)
Definition: nodeFuncs.c:42
int parser_errposition(ParseState *pstate, int location)
Definition: parse_node.c:111
int errmsg(const char *fmt,...)
Definition: elog.c:784

◆ coerce_to_domain()

Node* coerce_to_domain ( Node arg,
Oid  baseTypeId,
int32  baseTypeMod,
Oid  typeId,
CoercionContext  ccontext,
CoercionForm  cformat,
int  location,
bool  hideInputCoercion 
)

Definition at line 663 of file parse_coerce.c.

References arg, CoerceToDomain::arg, COERCE_IMPLICIT_CAST, coerce_type_typmod(), CoerceToDomain::coercionformat, getBaseTypeAndTypmod(), hide_coercion_node(), InvalidOid, CoerceToDomain::location, makeNode, CoerceToDomain::resulttype, and CoerceToDomain::resulttypmod.

Referenced by coerce_record_to_complex(), coerce_type(), expand_targetlist(), ReplaceVarsFromTargetList_callback(), rewriteTargetListIU(), rewriteValuesRTE(), and transformAssignmentIndirection().

666 {
667  CoerceToDomain *result;
668 
669  /* Get the base type if it hasn't been supplied */
670  if (baseTypeId == InvalidOid)
671  baseTypeId = getBaseTypeAndTypmod(typeId, &baseTypeMod);
672 
673  /* If it isn't a domain, return the node as it was passed in */
674  if (baseTypeId == typeId)
675  return arg;
676 
677  /* Suppress display of nested coercion steps */
678  if (hideInputCoercion)
679  hide_coercion_node(arg);
680 
681  /*
682  * If the domain applies a typmod to its base type, build the appropriate
683  * coercion step. Mark it implicit for display purposes, because we don't
684  * want it shown separately by ruleutils.c; but the isExplicit flag passed
685  * to the conversion function depends on the manner in which the domain
686  * coercion is invoked, so that the semantics of implicit and explicit
687  * coercion differ. (Is that really the behavior we want?)
688  *
689  * NOTE: because we apply this as part of the fixed expression structure,
690  * ALTER DOMAIN cannot alter the typtypmod. But it's unclear that that
691  * would be safe to do anyway, without lots of knowledge about what the
692  * base type thinks the typmod means.
693  */
694  arg = coerce_type_typmod(arg, baseTypeId, baseTypeMod,
695  ccontext, COERCE_IMPLICIT_CAST, location,
696  false);
697 
698  /*
699  * Now build the domain coercion node. This represents run-time checking
700  * of any constraints currently attached to the domain. This also ensures
701  * that the expression is properly labeled as to result type.
702  */
703  result = makeNode(CoerceToDomain);
704  result->arg = (Expr *) arg;
705  result->resulttype = typeId;
706  result->resulttypmod = -1; /* currently, always -1 for domains */
707  /* resultcollid will be set by parse_collate.c */
708  result->coercionformat = cformat;
709  result->location = location;
710 
711  return (Node *) result;
712 }
Oid getBaseTypeAndTypmod(Oid typid, int32 *typmod)
Definition: lsyscache.c:2316
int32 resulttypmod
Definition: primnodes.h:1247
Definition: nodes.h:525
CoercionForm coercionformat
Definition: primnodes.h:1249
static void hide_coercion_node(Node *node)
Definition: parse_coerce.c:782
static Node * coerce_type_typmod(Node *node, Oid targetTypeId, int32 targetTypMod, CoercionContext ccontext, CoercionForm cformat, int location, bool hideInputCoercion)
Definition: parse_coerce.c:740
#define InvalidOid
Definition: postgres_ext.h:36
#define makeNode(_type_)
Definition: nodes.h:573
void * arg

◆ coerce_to_specific_type()

Node* coerce_to_specific_type ( ParseState pstate,
Node node,
Oid  targetTypeId,
const char *  constructName 
)

Definition at line 1229 of file parse_coerce.c.

References coerce_to_specific_type_typmod().

Referenced by interpret_function_parameter_list(), transformFrameOffset(), transformLimitClause(), transformRangeTableFunc(), transformRangeTableSample(), transformXmlExpr(), and transformXmlSerialize().

1232 {
1233  return coerce_to_specific_type_typmod(pstate, node,
1234  targetTypeId, -1,
1235  constructName);
1236 }
Node * coerce_to_specific_type_typmod(ParseState *pstate, Node *node, Oid targetTypeId, int32 targetTypmod, const char *constructName)

◆ coerce_to_specific_type_typmod()

Node* coerce_to_specific_type_typmod ( ParseState pstate,
Node node,
Oid  targetTypeId,
int32  targetTypmod,
const char *  constructName 
)

Definition at line 1180 of file parse_coerce.c.

References COERCE_IMPLICIT_CAST, coerce_to_target_type(), COERCION_ASSIGNMENT, ereport, errcode(), errmsg(), ERROR, expression_returns_set(), exprLocation(), exprType(), format_type_be(), and parser_errposition().

Referenced by coerce_to_specific_type(), and transformRangeTableFunc().

1183 {
1184  Oid inputTypeId = exprType(node);
1185 
1186  if (inputTypeId != targetTypeId)
1187  {
1188  Node *newnode;
1189 
1190  newnode = coerce_to_target_type(pstate, node, inputTypeId,
1191  targetTypeId, targetTypmod,
1194  -1);
1195  if (newnode == NULL)
1196  ereport(ERROR,
1197  (errcode(ERRCODE_DATATYPE_MISMATCH),
1198  /* translator: first %s is name of a SQL construct, eg LIMIT */
1199  errmsg("argument of %s must be type %s, not type %s",
1200  constructName,
1201  format_type_be(targetTypeId),
1202  format_type_be(inputTypeId)),
1203  parser_errposition(pstate, exprLocation(node))));
1204  node = newnode;
1205  }
1206 
1207  if (expression_returns_set(node))
1208  ereport(ERROR,
1209  (errcode(ERRCODE_DATATYPE_MISMATCH),
1210  /* translator: %s is name of a SQL construct, eg LIMIT */
1211  errmsg("argument of %s must not return a set",
1212  constructName),
1213  parser_errposition(pstate, exprLocation(node))));
1214 
1215  return node;
1216 }
int exprLocation(const Node *expr)
Definition: nodeFuncs.c:1192
bool expression_returns_set(Node *clause)
Definition: nodeFuncs.c:670
Definition: nodes.h:525
int errcode(int sqlerrcode)
Definition: elog.c:570
char * format_type_be(Oid type_oid)
Definition: format_type.c:326
unsigned int Oid
Definition: postgres_ext.h:31
#define ERROR
Definition: elog.h:43
Node * coerce_to_target_type(ParseState *pstate, Node *expr, Oid exprtype, Oid targettype, int32 targettypmod, CoercionContext ccontext, CoercionForm cformat, int location)
Definition: parse_coerce.c:78
#define ereport(elevel, rest)
Definition: elog.h:141
Oid exprType(const Node *expr)
Definition: nodeFuncs.c:42
int parser_errposition(ParseState *pstate, int location)
Definition: parse_node.c:111
int errmsg(const char *fmt,...)
Definition: elog.c:784

◆ coerce_to_target_type()

Node* coerce_to_target_type ( ParseState pstate,
Node expr,
Oid  exprtype,
Oid  targettype,
int32  targettypmod,
CoercionContext  ccontext,
CoercionForm  cformat,
int  location 
)

Definition at line 78 of file parse_coerce.c.

References arg, CollateExpr::arg, can_coerce_type(), coerce_type(), coerce_type_typmod(), CollateExpr::collOid, IsA, CollateExpr::location, and makeNode.

Referenced by ATExecAddColumn(), ATExecAlterColumnType(), ATPrepAlterColumnType(), build_coercion_expression(), build_column_default(), coerce_record_to_complex(), coerce_to_boolean(), coerce_to_specific_type_typmod(), cookDefault(), EvaluateParams(), get_cast_hashentry(), transformArrayExpr(), transformAssignedExpr(), transformAssignmentIndirection(), transformAssignmentSubscripts(), transformContainerSubscripts(), transformPartitionBoundValue(), transformTypeCast(), and transformXmlSerialize().

83 {
84  Node *result;
85  Node *origexpr;
86 
87  if (!can_coerce_type(1, &exprtype, &targettype, ccontext))
88  return NULL;
89 
90  /*
91  * If the input has a CollateExpr at the top, strip it off, perform the
92  * coercion, and put a new one back on. This is annoying since it
93  * duplicates logic in coerce_type, but if we don't do this then it's too
94  * hard to tell whether coerce_type actually changed anything, and we
95  * *must* know that to avoid possibly calling hide_coercion_node on
96  * something that wasn't generated by coerce_type. Note that if there are
97  * multiple stacked CollateExprs, we just discard all but the topmost.
98  */
99  origexpr = expr;
100  while (expr && IsA(expr, CollateExpr))
101  expr = (Node *) ((CollateExpr *) expr)->arg;
102 
103  result = coerce_type(pstate, expr, exprtype,
104  targettype, targettypmod,
105  ccontext, cformat, location);
106 
107  /*
108  * If the target is a fixed-length type, it may need a length coercion as
109  * well as a type coercion. If we find ourselves adding both, force the
110  * inner coercion node to implicit display form.
111  */
112  result = coerce_type_typmod(result,
113  targettype, targettypmod,
114  ccontext, cformat, location,
115  (result != expr && !IsA(result, Const)));
116 
117  if (expr != origexpr)
118  {
119  /* Reinstall top CollateExpr */
120  CollateExpr *coll = (CollateExpr *) origexpr;
121  CollateExpr *newcoll = makeNode(CollateExpr);
122 
123  newcoll->arg = (Expr *) result;
124  newcoll->collOid = coll->collOid;
125  newcoll->location = coll->location;
126  result = (Node *) newcoll;
127  }
128 
129  return result;
130 }
#define IsA(nodeptr, _type_)
Definition: nodes.h:576
bool can_coerce_type(int nargs, const Oid *input_typeids, const Oid *target_typeids, CoercionContext ccontext)
Definition: parse_coerce.c:543
Node * coerce_type(ParseState *pstate, Node *node, Oid inputTypeId, Oid targetTypeId, int32 targetTypeMod, CoercionContext ccontext, CoercionForm cformat, int location)
Definition: parse_coerce.c:156
Definition: nodes.h:525
static Node * coerce_type_typmod(Node *node, Oid targetTypeId, int32 targetTypMod, CoercionContext ccontext, CoercionForm cformat, int location, bool hideInputCoercion)
Definition: parse_coerce.c:740
#define makeNode(_type_)
Definition: nodes.h:573
Expr * arg
Definition: primnodes.h:886
void * arg
int location
Definition: primnodes.h:888

◆ coerce_type()

Node* coerce_type ( ParseState pstate,
Node node,
Oid  inputTypeId,
Oid  targetTypeId,
int32  targetTypeMod,
CoercionContext  ccontext,
CoercionForm  cformat,
int  location 
)

Definition at line 156 of file parse_coerce.c.

References ConvertRowtypeExpr::arg, CollateExpr::arg, build_coercion_expression(), cancel_parser_errposition_callback(), COERCE_IMPLICIT_CAST, coerce_record_to_complex(), coerce_to_domain(), coerce_type(), COERCION_PATH_NONE, COERCION_PATH_RELABELTYPE, CollateExpr::collOid, Const::constbyval, Const::constcollid, Const::constisnull, Const::constlen, Const::consttype, Const::consttypmod, Const::constvalue, ConvertRowtypeExpr::convertformat, DatumGetCString, datumIsEqual(), elog, ERROR, find_coercion_pathway(), format_type_be(), getBaseType(), getBaseTypeAndTypmod(), InvalidOid, is_complex_array(), IsA, ISCOMPLEX, Const::location, RelabelType::location, ConvertRowtypeExpr::location, CollateExpr::location, makeNode, makeRelabelType(), ParseState::p_coerce_param_hook, PG_DETOAST_DATUM, PointerGetDatum, ReleaseSysCache(), ConvertRowtypeExpr::resulttype, setup_parser_errposition_callback(), stringTypeDatum(), typeByVal(), typeidType(), typeInheritsFrom(), typeIsOfTypedTable(), typeLen(), typeTypeCollation(), typeTypeName(), and WARNING.

Referenced by addTargetToGroupList(), addTargetToSortList(), buildMergedJoinVar(), coerce_to_common_type(), coerce_to_target_type(), coerce_type(), make_fn_arguments(), ParseFuncOrColumn(), resolveTargetListUnknowns(), transformArrayExpr(), and unify_hypothetical_args().

159 {
160  Node *result;
161  CoercionPathType pathtype;
162  Oid funcId;
163 
164  if (targetTypeId == inputTypeId ||
165  node == NULL)
166  {
167  /* no conversion needed */
168  return node;
169  }
170  if (targetTypeId == ANYOID ||
171  targetTypeId == ANYELEMENTOID ||
172  targetTypeId == ANYNONARRAYOID)
173  {
174  /*
175  * Assume can_coerce_type verified that implicit coercion is okay.
176  *
177  * Note: by returning the unmodified node here, we are saying that
178  * it's OK to treat an UNKNOWN constant as a valid input for a
179  * function accepting ANY, ANYELEMENT, or ANYNONARRAY. This should be
180  * all right, since an UNKNOWN value is still a perfectly valid Datum.
181  *
182  * NB: we do NOT want a RelabelType here: the exposed type of the
183  * function argument must be its actual type, not the polymorphic
184  * pseudotype.
185  */
186  return node;
187  }
188  if (targetTypeId == ANYARRAYOID ||
189  targetTypeId == ANYENUMOID ||
190  targetTypeId == ANYRANGEOID)
191  {
192  /*
193  * Assume can_coerce_type verified that implicit coercion is okay.
194  *
195  * These cases are unlike the ones above because the exposed type of
196  * the argument must be an actual array, enum, or range type. In
197  * particular the argument must *not* be an UNKNOWN constant. If it
198  * is, we just fall through; below, we'll call anyarray_in,
199  * anyenum_in, or anyrange_in, which will produce an error. Also, if
200  * what we have is a domain over array, enum, or range, we have to
201  * relabel it to its base type.
202  *
203  * Note: currently, we can't actually see a domain-over-enum here,
204  * since the other functions in this file will not match such a
205  * parameter to ANYENUM. But that should get changed eventually.
206  */
207  if (inputTypeId != UNKNOWNOID)
208  {
209  Oid baseTypeId = getBaseType(inputTypeId);
210 
211  if (baseTypeId != inputTypeId)
212  {
213  RelabelType *r = makeRelabelType((Expr *) node,
214  baseTypeId, -1,
215  InvalidOid,
216  cformat);
217 
218  r->location = location;
219  return (Node *) r;
220  }
221  /* Not a domain type, so return it as-is */
222  return node;
223  }
224  }
225  if (inputTypeId == UNKNOWNOID && IsA(node, Const))
226  {
227  /*
228  * Input is a string constant with previously undetermined type. Apply
229  * the target type's typinput function to it to produce a constant of
230  * the target type.
231  *
232  * NOTE: this case cannot be folded together with the other
233  * constant-input case, since the typinput function does not
234  * necessarily behave the same as a type conversion function. For
235  * example, int4's typinput function will reject "1.2", whereas
236  * float-to-int type conversion will round to integer.
237  *
238  * XXX if the typinput function is not immutable, we really ought to
239  * postpone evaluation of the function call until runtime. But there
240  * is no way to represent a typinput function call as an expression
241  * tree, because C-string values are not Datums. (XXX This *is*
242  * possible as of 7.3, do we want to do it?)
243  */
244  Const *con = (Const *) node;
245  Const *newcon = makeNode(Const);
246  Oid baseTypeId;
247  int32 baseTypeMod;
248  int32 inputTypeMod;
249  Type baseType;
250  ParseCallbackState pcbstate;
251 
252  /*
253  * If the target type is a domain, we want to call its base type's
254  * input routine, not domain_in(). This is to avoid premature failure
255  * when the domain applies a typmod: existing input routines follow
256  * implicit-coercion semantics for length checks, which is not always
257  * what we want here. The needed check will be applied properly
258  * inside coerce_to_domain().
259  */
260  baseTypeMod = targetTypeMod;
261  baseTypeId = getBaseTypeAndTypmod(targetTypeId, &baseTypeMod);
262 
263  /*
264  * For most types we pass typmod -1 to the input routine, because
265  * existing input routines follow implicit-coercion semantics for
266  * length checks, which is not always what we want here. Any length
267  * constraint will be applied later by our caller. An exception
268  * however is the INTERVAL type, for which we *must* pass the typmod
269  * or it won't be able to obey the bizarre SQL-spec input rules. (Ugly
270  * as sin, but so is this part of the spec...)
271  */
272  if (baseTypeId == INTERVALOID)
273  inputTypeMod = baseTypeMod;
274  else
275  inputTypeMod = -1;
276 
277  baseType = typeidType(baseTypeId);
278 
279  newcon->consttype = baseTypeId;
280  newcon->consttypmod = inputTypeMod;
281  newcon->constcollid = typeTypeCollation(baseType);
282  newcon->constlen = typeLen(baseType);
283  newcon->constbyval = typeByVal(baseType);
284  newcon->constisnull = con->constisnull;
285 
286  /*
287  * We use the original literal's location regardless of the position
288  * of the coercion. This is a change from pre-9.2 behavior, meant to
289  * simplify life for pg_stat_statements.
290  */
291  newcon->location = con->location;
292 
293  /*
294  * Set up to point at the constant's text if the input routine throws
295  * an error.
296  */
297  setup_parser_errposition_callback(&pcbstate, pstate, con->location);
298 
299  /*
300  * We assume here that UNKNOWN's internal representation is the same
301  * as CSTRING.
302  */
303  if (!con->constisnull)
304  newcon->constvalue = stringTypeDatum(baseType,
306  inputTypeMod);
307  else
308  newcon->constvalue = stringTypeDatum(baseType,
309  NULL,
310  inputTypeMod);
311 
312  /*
313  * If it's a varlena value, force it to be in non-expanded
314  * (non-toasted) format; this avoids any possible dependency on
315  * external values and improves consistency of representation.
316  */
317  if (!con->constisnull && newcon->constlen == -1)
318  newcon->constvalue =
320 
321 #ifdef RANDOMIZE_ALLOCATED_MEMORY
322 
323  /*
324  * For pass-by-reference data types, repeat the conversion to see if
325  * the input function leaves any uninitialized bytes in the result. We
326  * can only detect that reliably if RANDOMIZE_ALLOCATED_MEMORY is
327  * enabled, so we don't bother testing otherwise. The reason we don't
328  * want any instability in the input function is that comparison of
329  * Const nodes relies on bytewise comparison of the datums, so if the
330  * input function leaves garbage then subexpressions that should be
331  * identical may not get recognized as such. See pgsql-hackers
332  * discussion of 2008-04-04.
333  */
334  if (!con->constisnull && !newcon->constbyval)
335  {
336  Datum val2;
337 
338  val2 = stringTypeDatum(baseType,
340  inputTypeMod);
341  if (newcon->constlen == -1)
342  val2 = PointerGetDatum(PG_DETOAST_DATUM(val2));
343  if (!datumIsEqual(newcon->constvalue, val2, false, newcon->constlen))
344  elog(WARNING, "type %s has unstable input conversion for \"%s\"",
345  typeTypeName(baseType), DatumGetCString(con->constvalue));
346  }
347 #endif
348 
350 
351  result = (Node *) newcon;
352 
353  /* If target is a domain, apply constraints. */
354  if (baseTypeId != targetTypeId)
355  result = coerce_to_domain(result,
356  baseTypeId, baseTypeMod,
357  targetTypeId,
358  ccontext, cformat, location,
359  false);
360 
361  ReleaseSysCache(baseType);
362 
363  return result;
364  }
365  if (IsA(node, Param) &&
366  pstate != NULL && pstate->p_coerce_param_hook != NULL)
367  {
368  /*
369  * Allow the CoerceParamHook to decide what happens. It can return a
370  * transformed node (very possibly the same Param node), or return
371  * NULL to indicate we should proceed with normal coercion.
372  */
373  result = pstate->p_coerce_param_hook(pstate,
374  (Param *) node,
375  targetTypeId,
376  targetTypeMod,
377  location);
378  if (result)
379  return result;
380  }
381  if (IsA(node, CollateExpr))
382  {
383  /*
384  * If we have a COLLATE clause, we have to push the coercion
385  * underneath the COLLATE. This is really ugly, but there is little
386  * choice because the above hacks on Consts and Params wouldn't happen
387  * otherwise. This kluge has consequences in coerce_to_target_type.
388  */
389  CollateExpr *coll = (CollateExpr *) node;
390  CollateExpr *newcoll = makeNode(CollateExpr);
391 
392  newcoll->arg = (Expr *)
393  coerce_type(pstate, (Node *) coll->arg,
394  inputTypeId, targetTypeId, targetTypeMod,
395  ccontext, cformat, location);
396  newcoll->collOid = coll->collOid;
397  newcoll->location = coll->location;
398  return (Node *) newcoll;
399  }
400  pathtype = find_coercion_pathway(targetTypeId, inputTypeId, ccontext,
401  &funcId);
402  if (pathtype != COERCION_PATH_NONE)
403  {
404  if (pathtype != COERCION_PATH_RELABELTYPE)
405  {
406  /*
407  * Generate an expression tree representing run-time application
408  * of the conversion function. If we are dealing with a domain
409  * target type, the conversion function will yield the base type,
410  * and we need to extract the correct typmod to use from the
411  * domain's typtypmod.
412  */
413  Oid baseTypeId;
414  int32 baseTypeMod;
415 
416  baseTypeMod = targetTypeMod;
417  baseTypeId = getBaseTypeAndTypmod(targetTypeId, &baseTypeMod);
418 
419  result = build_coercion_expression(node, pathtype, funcId,
420  baseTypeId, baseTypeMod,
421  ccontext, cformat, location);
422 
423  /*
424  * If domain, coerce to the domain type and relabel with domain
425  * type ID, hiding the previous coercion node.
426  */
427  if (targetTypeId != baseTypeId)
428  result = coerce_to_domain(result, baseTypeId, baseTypeMod,
429  targetTypeId,
430  ccontext, cformat, location,
431  true);
432  }
433  else
434  {
435  /*
436  * We don't need to do a physical conversion, but we do need to
437  * attach a RelabelType node so that the expression will be seen
438  * to have the intended type when inspected by higher-level code.
439  *
440  * Also, domains may have value restrictions beyond the base type
441  * that must be accounted for. If the destination is a domain
442  * then we won't need a RelabelType node.
443  */
444  result = coerce_to_domain(node, InvalidOid, -1, targetTypeId,
445  ccontext, cformat, location,
446  false);
447  if (result == node)
448  {
449  /*
450  * XXX could we label result with exprTypmod(node) instead of
451  * default -1 typmod, to save a possible length-coercion
452  * later? Would work if both types have same interpretation of
453  * typmod, which is likely but not certain.
454  */
455  RelabelType *r = makeRelabelType((Expr *) result,
456  targetTypeId, -1,
457  InvalidOid,
458  cformat);
459 
460  r->location = location;
461  result = (Node *) r;
462  }
463  }
464  return result;
465  }
466  if (inputTypeId == RECORDOID &&
467  ISCOMPLEX(targetTypeId))
468  {
469  /* Coerce a RECORD to a specific complex type */
470  return coerce_record_to_complex(pstate, node, targetTypeId,
471  ccontext, cformat, location);
472  }
473  if (targetTypeId == RECORDOID &&
474  ISCOMPLEX(inputTypeId))
475  {
476  /* Coerce a specific complex type to RECORD */
477  /* NB: we do NOT want a RelabelType here */
478  return node;
479  }
480 #ifdef NOT_USED
481  if (inputTypeId == RECORDARRAYOID &&
482  is_complex_array(targetTypeId))
483  {
484  /* Coerce record[] to a specific complex array type */
485  /* not implemented yet ... */
486  }
487 #endif
488  if (targetTypeId == RECORDARRAYOID &&
489  is_complex_array(inputTypeId))
490  {
491  /* Coerce a specific complex array type to record[] */
492  /* NB: we do NOT want a RelabelType here */
493  return node;
494  }
495  if (typeInheritsFrom(inputTypeId, targetTypeId)
496  || typeIsOfTypedTable(inputTypeId, targetTypeId))
497  {
498  /*
499  * Input class type is a subclass of target, so generate an
500  * appropriate runtime conversion (removing unneeded columns and
501  * possibly rearranging the ones that are wanted).
502  *
503  * We will also get here when the input is a domain over a subclass of
504  * the target type. To keep life simple for the executor, we define
505  * ConvertRowtypeExpr as only working between regular composite types;
506  * therefore, in such cases insert a RelabelType to smash the input
507  * expression down to its base type.
508  */
509  Oid baseTypeId = getBaseType(inputTypeId);
511 
512  if (baseTypeId != inputTypeId)
513  {
514  RelabelType *rt = makeRelabelType((Expr *) node,
515  baseTypeId, -1,
516  InvalidOid,
518 
519  rt->location = location;
520  node = (Node *) rt;
521  }
522  r->arg = (Expr *) node;
523  r->resulttype = targetTypeId;
524  r->convertformat = cformat;
525  r->location = location;
526  return (Node *) r;
527  }
528  /* If we get here, caller blew it */
529  elog(ERROR, "failed to find conversion function from %s to %s",
530  format_type_be(inputTypeId), format_type_be(targetTypeId));
531  return NULL; /* keep compiler quiet */
532 }
Datum constvalue
Definition: primnodes.h:200
Oid getBaseTypeAndTypmod(Oid typid, int32 *typmod)
Definition: lsyscache.c:2316
Oid typeTypeCollation(Type typ)
Definition: parse_type.c:639
#define IsA(nodeptr, _type_)
Definition: nodes.h:576
bool constbyval
Definition: primnodes.h:203
int16 typeLen(Type t)
Definition: parse_type.c:598
#define PointerGetDatum(X)
Definition: postgres.h:556
bool datumIsEqual(Datum value1, Datum value2, bool typByVal, int typLen)
Definition: datum.c:221
CoerceParamHook p_coerce_param_hook
Definition: parse_node.h:218
Node * coerce_type(ParseState *pstate, Node *node, Oid inputTypeId, Oid targetTypeId, int32 targetTypeMod, CoercionContext ccontext, CoercionForm cformat, int location)
Definition: parse_coerce.c:156
Definition: nodes.h:525
char * format_type_be(Oid type_oid)
Definition: format_type.c:326
unsigned int Oid
Definition: postgres_ext.h:31
CoercionPathType
Definition: parse_coerce.h:24
signed int int32
Definition: c.h:346
int constlen
Definition: primnodes.h:199
Oid consttype
Definition: primnodes.h:196
void cancel_parser_errposition_callback(ParseCallbackState *pcbstate)
Definition: parse_node.c:161
bool typeByVal(Type t)
Definition: parse_type.c:608
#define ERROR
Definition: elog.h:43
#define DatumGetCString(X)
Definition: postgres.h:566
char * typeTypeName(Type t)
Definition: parse_type.c:618
Datum stringTypeDatum(Type tp, char *string, int32 atttypmod)
Definition: parse_type.c:653
Node * coerce_to_domain(Node *arg, Oid baseTypeId, int32 baseTypeMod, Oid typeId, CoercionContext ccontext, CoercionForm cformat, int location, bool hideInputCoercion)
Definition: parse_coerce.c:663
Oid constcollid
Definition: primnodes.h:198
RelabelType * makeRelabelType(Expr *arg, Oid rtype, int32 rtypmod, Oid rcollid, CoercionForm rformat)
Definition: makefuncs.c:400
static Node * build_coercion_expression(Node *node, CoercionPathType pathtype, Oid funcId, Oid targetTypeId, int32 targetTypMod, CoercionContext ccontext, CoercionForm cformat, int location)
Definition: parse_coerce.c:810
void setup_parser_errposition_callback(ParseCallbackState *pcbstate, ParseState *pstate, int location)
Definition: parse_node.c:145
#define WARNING
Definition: elog.h:40
int location
Definition: primnodes.h:207
uintptr_t Datum
Definition: postgres.h:367
CoercionForm convertformat
Definition: primnodes.h:872
void ReleaseSysCache(HeapTuple tuple)
Definition: syscache.c:1172
#define InvalidOid
Definition: postgres_ext.h:36
#define makeNode(_type_)
Definition: nodes.h:573
bool typeInheritsFrom(Oid subclassTypeId, Oid superclassTypeId)
Definition: pg_inherits.c:315
#define ISCOMPLEX(typeid)
Definition: parse_type.h:58
static bool typeIsOfTypedTable(Oid reltypeId, Oid reloftypeId)
Expr * arg
Definition: primnodes.h:886
static Node * coerce_record_to_complex(ParseState *pstate, Node *node, Oid targetTypeId, CoercionContext ccontext, CoercionForm cformat, int location)
Definition: parse_coerce.c:983
int32 consttypmod
Definition: primnodes.h:197
CoercionPathType find_coercion_pathway(Oid targetTypeId, Oid sourceTypeId, CoercionContext ccontext, Oid *funcid)
#define elog(elevel,...)
Definition: elog.h:226
#define PG_DETOAST_DATUM(datum)
Definition: fmgr.h:235
static bool is_complex_array(Oid typid)
Type typeidType(Oid id)
Definition: parse_type.c:577
int location
Definition: primnodes.h:888
Oid getBaseType(Oid typid)
Definition: lsyscache.c:2299
int location
Definition: primnodes.h:805
bool constisnull
Definition: primnodes.h:201

◆ enforce_generic_type_consistency()

Oid enforce_generic_type_consistency ( const Oid actual_arg_types,
Oid declared_arg_types,
int  nargs,
Oid  rettype,
bool  allow_poly 
)

Definition at line 1672 of file parse_coerce.c.

References ereport, errcode(), errdetail(), errmsg(), ERROR, format_type_be(), get_array_type(), get_element_type(), get_range_subtype(), getBaseType(), InvalidOid, OidIsValid, type_is_array_domain, and type_is_enum().

Referenced by lookup_agg_function(), make_op(), make_scalar_array_op(), ParseFuncOrColumn(), recheck_cast_function_args(), and resolve_aggregate_transtype().

1677 {
1678  int j;
1679  bool have_generics = false;
1680  bool have_unknowns = false;
1681  Oid elem_typeid = InvalidOid;
1682  Oid array_typeid = InvalidOid;
1683  Oid range_typeid = InvalidOid;
1684  Oid array_typelem;
1685  Oid range_typelem;
1686  bool have_anyelement = (rettype == ANYELEMENTOID ||
1687  rettype == ANYNONARRAYOID ||
1688  rettype == ANYENUMOID);
1689  bool have_anynonarray = (rettype == ANYNONARRAYOID);
1690  bool have_anyenum = (rettype == ANYENUMOID);
1691 
1692  /*
1693  * Loop through the arguments to see if we have any that are polymorphic.
1694  * If so, require the actual types to be consistent.
1695  */
1696  for (j = 0; j < nargs; j++)
1697  {
1698  Oid decl_type = declared_arg_types[j];
1699  Oid actual_type = actual_arg_types[j];
1700 
1701  if (decl_type == ANYELEMENTOID ||
1702  decl_type == ANYNONARRAYOID ||
1703  decl_type == ANYENUMOID)
1704  {
1705  have_generics = have_anyelement = true;
1706  if (decl_type == ANYNONARRAYOID)
1707  have_anynonarray = true;
1708  else if (decl_type == ANYENUMOID)
1709  have_anyenum = true;
1710  if (actual_type == UNKNOWNOID)
1711  {
1712  have_unknowns = true;
1713  continue;
1714  }
1715  if (allow_poly && decl_type == actual_type)
1716  continue; /* no new information here */
1717  if (OidIsValid(elem_typeid) && actual_type != elem_typeid)
1718  ereport(ERROR,
1719  (errcode(ERRCODE_DATATYPE_MISMATCH),
1720  errmsg("arguments declared \"anyelement\" are not all alike"),
1721  errdetail("%s versus %s",
1722  format_type_be(elem_typeid),
1723  format_type_be(actual_type))));
1724  elem_typeid = actual_type;
1725  }
1726  else if (decl_type == ANYARRAYOID)
1727  {
1728  have_generics = true;
1729  if (actual_type == UNKNOWNOID)
1730  {
1731  have_unknowns = true;
1732  continue;
1733  }
1734  if (allow_poly && decl_type == actual_type)
1735  continue; /* no new information here */
1736  actual_type = getBaseType(actual_type); /* flatten domains */
1737  if (OidIsValid(array_typeid) && actual_type != array_typeid)
1738  ereport(ERROR,
1739  (errcode(ERRCODE_DATATYPE_MISMATCH),
1740  errmsg("arguments declared \"anyarray\" are not all alike"),
1741  errdetail("%s versus %s",
1742  format_type_be(array_typeid),
1743  format_type_be(actual_type))));
1744  array_typeid = actual_type;
1745  }
1746  else if (decl_type == ANYRANGEOID)
1747  {
1748  have_generics = true;
1749  if (actual_type == UNKNOWNOID)
1750  {
1751  have_unknowns = true;
1752  continue;
1753  }
1754  if (allow_poly && decl_type == actual_type)
1755  continue; /* no new information here */
1756  actual_type = getBaseType(actual_type); /* flatten domains */
1757  if (OidIsValid(range_typeid) && actual_type != range_typeid)
1758  ereport(ERROR,
1759  (errcode(ERRCODE_DATATYPE_MISMATCH),
1760  errmsg("arguments declared \"anyrange\" are not all alike"),
1761  errdetail("%s versus %s",
1762  format_type_be(range_typeid),
1763  format_type_be(actual_type))));
1764  range_typeid = actual_type;
1765  }
1766  }
1767 
1768  /*
1769  * Fast Track: if none of the arguments are polymorphic, return the
1770  * unmodified rettype. We assume it can't be polymorphic either.
1771  */
1772  if (!have_generics)
1773  return rettype;
1774 
1775  /* Get the element type based on the array type, if we have one */
1776  if (OidIsValid(array_typeid))
1777  {
1778  if (array_typeid == ANYARRAYOID && !have_anyelement)
1779  {
1780  /* Special case for ANYARRAY input: okay iff no ANYELEMENT */
1781  array_typelem = ANYELEMENTOID;
1782  }
1783  else
1784  {
1785  array_typelem = get_element_type(array_typeid);
1786  if (!OidIsValid(array_typelem))
1787  ereport(ERROR,
1788  (errcode(ERRCODE_DATATYPE_MISMATCH),
1789  errmsg("argument declared %s is not an array but type %s",
1790  "anyarray", format_type_be(array_typeid))));
1791  }
1792 
1793  if (!OidIsValid(elem_typeid))
1794  {
1795  /*
1796  * if we don't have an element type yet, use the one we just got
1797  */
1798  elem_typeid = array_typelem;
1799  }
1800  else if (array_typelem != elem_typeid)
1801  {
1802  /* otherwise, they better match */
1803  ereport(ERROR,
1804  (errcode(ERRCODE_DATATYPE_MISMATCH),
1805  errmsg("argument declared %s is not consistent with argument declared %s",
1806  "anyarray", "anyelement"),
1807  errdetail("%s versus %s",
1808  format_type_be(array_typeid),
1809  format_type_be(elem_typeid))));
1810  }
1811  }
1812 
1813  /* Get the element type based on the range type, if we have one */
1814  if (OidIsValid(range_typeid))
1815  {
1816  if (range_typeid == ANYRANGEOID && !have_anyelement)
1817  {
1818  /* Special case for ANYRANGE input: okay iff no ANYELEMENT */
1819  range_typelem = ANYELEMENTOID;
1820  }
1821  else
1822  {
1823  range_typelem = get_range_subtype(range_typeid);
1824  if (!OidIsValid(range_typelem))
1825  ereport(ERROR,
1826  (errcode(ERRCODE_DATATYPE_MISMATCH),
1827  errmsg("argument declared %s is not a range type but type %s",
1828  "anyrange",
1829  format_type_be(range_typeid))));
1830  }
1831 
1832  if (!OidIsValid(elem_typeid))
1833  {
1834  /*
1835  * if we don't have an element type yet, use the one we just got
1836  */
1837  elem_typeid = range_typelem;
1838  }
1839  else if (range_typelem != elem_typeid)
1840  {
1841  /* otherwise, they better match */
1842  ereport(ERROR,
1843  (errcode(ERRCODE_DATATYPE_MISMATCH),
1844  errmsg("argument declared %s is not consistent with argument declared %s",
1845  "anyrange", "anyelement"),
1846  errdetail("%s versus %s",
1847  format_type_be(range_typeid),
1848  format_type_be(elem_typeid))));
1849  }
1850  }
1851 
1852  if (!OidIsValid(elem_typeid))
1853  {
1854  if (allow_poly)
1855  {
1856  elem_typeid = ANYELEMENTOID;
1857  array_typeid = ANYARRAYOID;
1858  range_typeid = ANYRANGEOID;
1859  }
1860  else
1861  {
1862  /* Only way to get here is if all the generic args are UNKNOWN */
1863  ereport(ERROR,
1864  (errcode(ERRCODE_DATATYPE_MISMATCH),
1865  errmsg("could not determine polymorphic type because input has type %s",
1866  "unknown")));
1867  }
1868  }
1869 
1870  if (have_anynonarray && elem_typeid != ANYELEMENTOID)
1871  {
1872  /* require the element type to not be an array or domain over array */
1873  if (type_is_array_domain(elem_typeid))
1874  ereport(ERROR,
1875  (errcode(ERRCODE_DATATYPE_MISMATCH),
1876  errmsg("type matched to anynonarray is an array type: %s",
1877  format_type_be(elem_typeid))));
1878  }
1879 
1880  if (have_anyenum && elem_typeid != ANYELEMENTOID)
1881  {
1882  /* require the element type to be an enum */
1883  if (!type_is_enum(elem_typeid))
1884  ereport(ERROR,
1885  (errcode(ERRCODE_DATATYPE_MISMATCH),
1886  errmsg("type matched to anyenum is not an enum type: %s",
1887  format_type_be(elem_typeid))));
1888  }
1889 
1890  /*
1891  * If we had any unknown inputs, re-scan to assign correct types
1892  */
1893  if (have_unknowns)
1894  {
1895  for (j = 0; j < nargs; j++)
1896  {
1897  Oid decl_type = declared_arg_types[j];
1898  Oid actual_type = actual_arg_types[j];
1899 
1900  if (actual_type != UNKNOWNOID)
1901  continue;
1902 
1903  if (decl_type == ANYELEMENTOID ||
1904  decl_type == ANYNONARRAYOID ||
1905  decl_type == ANYENUMOID)
1906  declared_arg_types[j] = elem_typeid;
1907  else if (decl_type == ANYARRAYOID)
1908  {
1909  if (!OidIsValid(array_typeid))
1910  {
1911  array_typeid = get_array_type(elem_typeid);
1912  if (!OidIsValid(array_typeid))
1913  ereport(ERROR,
1914  (errcode(ERRCODE_UNDEFINED_OBJECT),
1915  errmsg("could not find array type for data type %s",
1916  format_type_be(elem_typeid))));
1917  }
1918  declared_arg_types[j] = array_typeid;
1919  }
1920  else if (decl_type == ANYRANGEOID)
1921  {
1922  if (!OidIsValid(range_typeid))
1923  {
1924  ereport(ERROR,
1925  (errcode(ERRCODE_UNDEFINED_OBJECT),
1926  errmsg("could not find range type for data type %s",
1927  format_type_be(elem_typeid))));
1928  }
1929  declared_arg_types[j] = range_typeid;
1930  }
1931  }
1932  }
1933 
1934  /* if we return ANYARRAY use the appropriate argument type */
1935  if (rettype == ANYARRAYOID)
1936  {
1937  if (!OidIsValid(array_typeid))
1938  {
1939  array_typeid = get_array_type(elem_typeid);
1940  if (!OidIsValid(array_typeid))
1941  ereport(ERROR,
1942  (errcode(ERRCODE_UNDEFINED_OBJECT),
1943  errmsg("could not find array type for data type %s",
1944  format_type_be(elem_typeid))));
1945  }
1946  return array_typeid;
1947  }
1948 
1949  /* if we return ANYRANGE use the appropriate argument type */
1950  if (rettype == ANYRANGEOID)
1951  {
1952  if (!OidIsValid(range_typeid))
1953  {
1954  ereport(ERROR,
1955  (errcode(ERRCODE_UNDEFINED_OBJECT),
1956  errmsg("could not find range type for data type %s",
1957  format_type_be(elem_typeid))));
1958  }
1959  return range_typeid;
1960  }
1961 
1962  /* if we return ANYELEMENT use the appropriate argument type */
1963  if (rettype == ANYELEMENTOID ||
1964  rettype == ANYNONARRAYOID ||
1965  rettype == ANYENUMOID)
1966  return elem_typeid;
1967 
1968  /* we don't return a generic type; send back the original return type */
1969  return rettype;
1970 }
#define type_is_array_domain(typid)
Definition: lsyscache.h:186
Oid get_element_type(Oid typid)
Definition: lsyscache.c:2526
Oid get_array_type(Oid typid)
Definition: lsyscache.c:2554
int errcode(int sqlerrcode)
Definition: elog.c:570
char * format_type_be(Oid type_oid)
Definition: format_type.c:326
unsigned int Oid
Definition: postgres_ext.h:31
#define OidIsValid(objectId)
Definition: c.h:638
#define ERROR
Definition: elog.h:43
int errdetail(const char *fmt,...)
Definition: elog.c:860
#define ereport(elevel, rest)
Definition: elog.h:141
#define InvalidOid
Definition: postgres_ext.h:36
bool type_is_enum(Oid typid)
Definition: lsyscache.c:2456
int errmsg(const char *fmt,...)
Definition: elog.c:784
Oid getBaseType(Oid typid)
Definition: lsyscache.c:2299
Oid get_range_subtype(Oid rangeOid)
Definition: lsyscache.c:3135

◆ find_coercion_pathway()

CoercionPathType find_coercion_pathway ( Oid  targetTypeId,
Oid  sourceTypeId,
CoercionContext  ccontext,
Oid funcid 
)

Definition at line 2231 of file parse_coerce.c.

References CASTSOURCETARGET, COERCION_ASSIGNMENT, COERCION_EXPLICIT, COERCION_IMPLICIT, COERCION_PATH_ARRAYCOERCE, COERCION_PATH_COERCEVIAIO, COERCION_PATH_FUNC, COERCION_PATH_NONE, COERCION_PATH_RELABELTYPE, elog, ERROR, find_coercion_pathway(), get_element_type(), getBaseType(), GETSTRUCT, HeapTupleIsValid, InvalidOid, ObjectIdGetDatum, OidIsValid, ReleaseSysCache(), SearchSysCache2(), and TypeCategory().

Referenced by can_coerce_type(), coerce_type(), find_coercion_pathway(), findFkeyCast(), func_get_detail(), json_categorize_type(), jsonb_categorize_type(), and ri_HashCompareOp().

2234 {
2236  HeapTuple tuple;
2237 
2238  *funcid = InvalidOid;
2239 
2240  /* Perhaps the types are domains; if so, look at their base types */
2241  if (OidIsValid(sourceTypeId))
2242  sourceTypeId = getBaseType(sourceTypeId);
2243  if (OidIsValid(targetTypeId))
2244  targetTypeId = getBaseType(targetTypeId);
2245 
2246  /* Domains are always coercible to and from their base type */
2247  if (sourceTypeId == targetTypeId)
2249 
2250  /* Look in pg_cast */
2252  ObjectIdGetDatum(sourceTypeId),
2253  ObjectIdGetDatum(targetTypeId));
2254 
2255  if (HeapTupleIsValid(tuple))
2256  {
2257  Form_pg_cast castForm = (Form_pg_cast) GETSTRUCT(tuple);
2258  CoercionContext castcontext;
2259 
2260  /* convert char value for castcontext to CoercionContext enum */
2261  switch (castForm->castcontext)
2262  {
2263  case COERCION_CODE_IMPLICIT:
2264  castcontext = COERCION_IMPLICIT;
2265  break;
2266  case COERCION_CODE_ASSIGNMENT:
2267  castcontext = COERCION_ASSIGNMENT;
2268  break;
2269  case COERCION_CODE_EXPLICIT:
2270  castcontext = COERCION_EXPLICIT;
2271  break;
2272  default:
2273  elog(ERROR, "unrecognized castcontext: %d",
2274  (int) castForm->castcontext);
2275  castcontext = 0; /* keep compiler quiet */
2276  break;
2277  }
2278 
2279  /* Rely on ordering of enum for correct behavior here */
2280  if (ccontext >= castcontext)
2281  {
2282  switch (castForm->castmethod)
2283  {
2284  case COERCION_METHOD_FUNCTION:
2285  result = COERCION_PATH_FUNC;
2286  *funcid = castForm->castfunc;
2287  break;
2288  case COERCION_METHOD_INOUT:
2289  result = COERCION_PATH_COERCEVIAIO;
2290  break;
2291  case COERCION_METHOD_BINARY:
2292  result = COERCION_PATH_RELABELTYPE;
2293  break;
2294  default:
2295  elog(ERROR, "unrecognized castmethod: %d",
2296  (int) castForm->castmethod);
2297  break;
2298  }
2299  }
2300 
2301  ReleaseSysCache(tuple);
2302  }
2303  else
2304  {
2305  /*
2306  * If there's no pg_cast entry, perhaps we are dealing with a pair of
2307  * array types. If so, and if their element types have a conversion
2308  * pathway, report that we can coerce with an ArrayCoerceExpr.
2309  *
2310  * Hack: disallow coercions to oidvector and int2vector, which
2311  * otherwise tend to capture coercions that should go to "real" array
2312  * types. We want those types to be considered "real" arrays for many
2313  * purposes, but not this one. (Also, ArrayCoerceExpr isn't
2314  * guaranteed to produce an output that meets the restrictions of
2315  * these datatypes, such as being 1-dimensional.)
2316  */
2317  if (targetTypeId != OIDVECTOROID && targetTypeId != INT2VECTOROID)
2318  {
2319  Oid targetElem;
2320  Oid sourceElem;
2321 
2322  if ((targetElem = get_element_type(targetTypeId)) != InvalidOid &&
2323  (sourceElem = get_element_type(sourceTypeId)) != InvalidOid)
2324  {
2325  CoercionPathType elempathtype;
2326  Oid elemfuncid;
2327 
2328  elempathtype = find_coercion_pathway(targetElem,
2329  sourceElem,
2330  ccontext,
2331  &elemfuncid);
2332  if (elempathtype != COERCION_PATH_NONE)
2333  {
2334  result = COERCION_PATH_ARRAYCOERCE;
2335  }
2336  }
2337  }
2338 
2339  /*
2340  * If we still haven't found a possibility, consider automatic casting
2341  * using I/O functions. We allow assignment casts to string types and
2342  * explicit casts from string types to be handled this way. (The
2343  * CoerceViaIO mechanism is a lot more general than that, but this is
2344  * all we want to allow in the absence of a pg_cast entry.) It would
2345  * probably be better to insist on explicit casts in both directions,
2346  * but this is a compromise to preserve something of the pre-8.3
2347  * behavior that many types had implicit (yipes!) casts to text.
2348  */
2349  if (result == COERCION_PATH_NONE)
2350  {
2351  if (ccontext >= COERCION_ASSIGNMENT &&
2352  TypeCategory(targetTypeId) == TYPCATEGORY_STRING)
2353  result = COERCION_PATH_COERCEVIAIO;
2354  else if (ccontext >= COERCION_EXPLICIT &&
2355  TypeCategory(sourceTypeId) == TYPCATEGORY_STRING)
2356  result = COERCION_PATH_COERCEVIAIO;
2357  }
2358  }
2359 
2360  return result;
2361 }
#define GETSTRUCT(TUP)
Definition: htup_details.h:655
Oid get_element_type(Oid typid)
Definition: lsyscache.c:2526
unsigned int Oid
Definition: postgres_ext.h:31
#define OidIsValid(objectId)
Definition: c.h:638
CoercionContext
Definition: primnodes.h:426
CoercionPathType
Definition: parse_coerce.h:24
#define ObjectIdGetDatum(X)
Definition: postgres.h:507
#define ERROR
Definition: elog.h:43
FormData_pg_cast * Form_pg_cast
Definition: pg_cast.h:56
void ReleaseSysCache(HeapTuple tuple)
Definition: syscache.c:1172
#define InvalidOid
Definition: postgres_ext.h:36
TYPCATEGORY TypeCategory(Oid type)
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
HeapTuple SearchSysCache2(int cacheId, Datum key1, Datum key2)
Definition: syscache.c:1135
CoercionPathType find_coercion_pathway(Oid targetTypeId, Oid sourceTypeId, CoercionContext ccontext, Oid *funcid)
#define elog(elevel,...)
Definition: elog.h:226
Oid getBaseType(Oid typid)
Definition: lsyscache.c:2299

◆ find_typmod_coercion_function()

CoercionPathType find_typmod_coercion_function ( Oid  typeId,
Oid funcid 
)

Definition at line 2386 of file parse_coerce.c.

References CASTSOURCETARGET, COERCION_PATH_ARRAYCOERCE, COERCION_PATH_FUNC, COERCION_PATH_NONE, GETSTRUCT, HeapTupleIsValid, InvalidOid, ObjectIdGetDatum, OidIsValid, ReleaseSysCache(), SearchSysCache2(), and typeidType().

Referenced by coerce_type_typmod().

2388 {
2389  CoercionPathType result;
2390  Type targetType;
2391  Form_pg_type typeForm;
2392  HeapTuple tuple;
2393 
2394  *funcid = InvalidOid;
2395  result = COERCION_PATH_FUNC;
2396 
2397  targetType = typeidType(typeId);
2398  typeForm = (Form_pg_type) GETSTRUCT(targetType);
2399 
2400  /* Check for a varlena array type */
2401  if (typeForm->typelem != InvalidOid && typeForm->typlen == -1)
2402  {
2403  /* Yes, switch our attention to the element type */
2404  typeId = typeForm->typelem;
2405  result = COERCION_PATH_ARRAYCOERCE;
2406  }
2407  ReleaseSysCache(targetType);
2408 
2409  /* Look in pg_cast */
2411  ObjectIdGetDatum(typeId),
2412  ObjectIdGetDatum(typeId));
2413 
2414  if (HeapTupleIsValid(tuple))
2415  {
2416  Form_pg_cast castForm = (Form_pg_cast) GETSTRUCT(tuple);
2417 
2418  *funcid = castForm->castfunc;
2419  ReleaseSysCache(tuple);
2420  }
2421 
2422  if (!OidIsValid(*funcid))
2423  result = COERCION_PATH_NONE;
2424 
2425  return result;
2426 }
#define GETSTRUCT(TUP)
Definition: htup_details.h:655
#define OidIsValid(objectId)
Definition: c.h:638
CoercionPathType
Definition: parse_coerce.h:24
#define ObjectIdGetDatum(X)
Definition: postgres.h:507
FormData_pg_cast * Form_pg_cast
Definition: pg_cast.h:56
void ReleaseSysCache(HeapTuple tuple)
Definition: syscache.c:1172
#define InvalidOid
Definition: postgres_ext.h:36
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
FormData_pg_type * Form_pg_type
Definition: pg_type.h:251
HeapTuple SearchSysCache2(int cacheId, Datum key1, Datum key2)
Definition: syscache.c:1135
Type typeidType(Oid id)
Definition: parse_type.c:577

◆ IsBinaryCoercible()

bool IsBinaryCoercible ( Oid  srctype,
Oid  targettype 
)

Definition at line 2135 of file parse_coerce.c.

References CASTSOURCETARGET, getBaseType(), GETSTRUCT, HeapTupleIsValid, is_complex_array(), ISCOMPLEX, ObjectIdGetDatum, OidIsValid, ReleaseSysCache(), SearchSysCache2(), type_is_array, type_is_enum(), and type_is_range().

Referenced by AggregateCreate(), build_pertrans_for_aggref(), check_amproc_signature(), check_hash_func_signature(), check_sql_fn_retval(), compatible_oper(), CreateCast(), findRangeSubOpclass(), GetDefaultOpClass(), initialize_peragg(), lookup_agg_function(), ResolveOpClass(), ri_HashCompareOp(), satisfies_hash_partition(), ts_stat_sql(), tsvector_update_trigger(), and tupledesc_match().

2136 {
2137  HeapTuple tuple;
2138  Form_pg_cast castForm;
2139  bool result;
2140 
2141  /* Fast path if same type */
2142  if (srctype == targettype)
2143  return true;
2144 
2145  /* Anything is coercible to ANY or ANYELEMENT */
2146  if (targettype == ANYOID || targettype == ANYELEMENTOID)
2147  return true;
2148 
2149  /* If srctype is a domain, reduce to its base type */
2150  if (OidIsValid(srctype))
2151  srctype = getBaseType(srctype);
2152 
2153  /* Somewhat-fast path for domain -> base type case */
2154  if (srctype == targettype)
2155  return true;
2156 
2157  /* Also accept any array type as coercible to ANYARRAY */
2158  if (targettype == ANYARRAYOID)
2159  if (type_is_array(srctype))
2160  return true;
2161 
2162  /* Also accept any non-array type as coercible to ANYNONARRAY */
2163  if (targettype == ANYNONARRAYOID)
2164  if (!type_is_array(srctype))
2165  return true;
2166 
2167  /* Also accept any enum type as coercible to ANYENUM */
2168  if (targettype == ANYENUMOID)
2169  if (type_is_enum(srctype))
2170  return true;
2171 
2172  /* Also accept any range type as coercible to ANYRANGE */
2173  if (targettype == ANYRANGEOID)
2174  if (type_is_range(srctype))
2175  return true;
2176 
2177  /* Also accept any composite type as coercible to RECORD */
2178  if (targettype == RECORDOID)
2179  if (ISCOMPLEX(srctype))
2180  return true;
2181 
2182  /* Also accept any composite array type as coercible to RECORD[] */
2183  if (targettype == RECORDARRAYOID)
2184  if (is_complex_array(srctype))
2185  return true;
2186 
2187  /* Else look in pg_cast */
2189  ObjectIdGetDatum(srctype),
2190  ObjectIdGetDatum(targettype));
2191  if (!HeapTupleIsValid(tuple))
2192  return false; /* no cast */
2193  castForm = (Form_pg_cast) GETSTRUCT(tuple);
2194 
2195  result = (castForm->castmethod == COERCION_METHOD_BINARY &&
2196  castForm->castcontext == COERCION_CODE_IMPLICIT);
2197 
2198  ReleaseSysCache(tuple);
2199 
2200  return result;
2201 }
#define GETSTRUCT(TUP)
Definition: htup_details.h:655
bool type_is_range(Oid typid)
Definition: lsyscache.c:2466
#define OidIsValid(objectId)
Definition: c.h:638
#define ObjectIdGetDatum(X)
Definition: postgres.h:507
FormData_pg_cast * Form_pg_cast
Definition: pg_cast.h:56
void ReleaseSysCache(HeapTuple tuple)
Definition: syscache.c:1172
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
#define ISCOMPLEX(typeid)
Definition: parse_type.h:58
bool type_is_enum(Oid typid)
Definition: lsyscache.c:2456
HeapTuple SearchSysCache2(int cacheId, Datum key1, Datum key2)
Definition: syscache.c:1135
#define type_is_array(typid)
Definition: lsyscache.h:184
static bool is_complex_array(Oid typid)
Oid getBaseType(Oid typid)
Definition: lsyscache.c:2299

◆ IsPreferredType()

bool IsPreferredType ( TYPCATEGORY  category,
Oid  type 
)

Definition at line 2100 of file parse_coerce.c.

References get_type_category_preferred().

Referenced by func_select_candidate(), and GetDefaultOpClass().

2101 {
2102  char typcategory;
2103  bool typispreferred;
2104 
2105  get_type_category_preferred(type, &typcategory, &typispreferred);
2106  if (category == typcategory || category == TYPCATEGORY_INVALID)
2107  return typispreferred;
2108  else
2109  return false;
2110 }
void get_type_category_preferred(Oid typid, char *typcategory, bool *typispreferred)
Definition: lsyscache.c:2478

◆ parser_coercion_errposition()

int parser_coercion_errposition ( ParseState pstate,
int  coerce_location,
Node input_expr 
)

Definition at line 1249 of file parse_coerce.c.

References exprLocation(), and parser_errposition().

Referenced by coerce_record_to_complex(), and transformTypeCast().

1252 {
1253  if (coerce_location >= 0)
1254  return parser_errposition(pstate, coerce_location);
1255  else
1256  return parser_errposition(pstate, exprLocation(input_expr));
1257 }
int exprLocation(const Node *expr)
Definition: nodeFuncs.c:1192
int parser_errposition(ParseState *pstate, int location)
Definition: parse_node.c:111

◆ resolve_generic_type()

Oid resolve_generic_type ( Oid  declared_type,
Oid  context_actual_type,
Oid  context_declared_type 
)

Definition at line 1986 of file parse_coerce.c.

References elog, ereport, errcode(), errmsg(), ERROR, format_type_be(), get_array_type(), get_element_type(), get_range_subtype(), getBaseType(), InvalidOid, and OidIsValid.

Referenced by resolve_polymorphic_argtypes(), and resolve_polymorphic_tupdesc().

1989 {
1990  if (declared_type == ANYARRAYOID)
1991  {
1992  if (context_declared_type == ANYARRAYOID)
1993  {
1994  /*
1995  * Use actual type, but it must be an array; or if it's a domain
1996  * over array, use the base array type.
1997  */
1998  Oid context_base_type = getBaseType(context_actual_type);
1999  Oid array_typelem = get_element_type(context_base_type);
2000 
2001  if (!OidIsValid(array_typelem))
2002  ereport(ERROR,
2003  (errcode(ERRCODE_DATATYPE_MISMATCH),
2004  errmsg("argument declared %s is not an array but type %s",
2005  "anyarray", format_type_be(context_base_type))));
2006  return context_base_type;
2007  }
2008  else if (context_declared_type == ANYELEMENTOID ||
2009  context_declared_type == ANYNONARRAYOID ||
2010  context_declared_type == ANYENUMOID ||
2011  context_declared_type == ANYRANGEOID)
2012  {
2013  /* Use the array type corresponding to actual type */
2014  Oid array_typeid = get_array_type(context_actual_type);
2015 
2016  if (!OidIsValid(array_typeid))
2017  ereport(ERROR,
2018  (errcode(ERRCODE_UNDEFINED_OBJECT),
2019  errmsg("could not find array type for data type %s",
2020  format_type_be(context_actual_type))));
2021  return array_typeid;
2022  }
2023  }
2024  else if (declared_type == ANYELEMENTOID ||
2025  declared_type == ANYNONARRAYOID ||
2026  declared_type == ANYENUMOID ||
2027  declared_type == ANYRANGEOID)
2028  {
2029  if (context_declared_type == ANYARRAYOID)
2030  {
2031  /* Use the element type corresponding to actual type */
2032  Oid context_base_type = getBaseType(context_actual_type);
2033  Oid array_typelem = get_element_type(context_base_type);
2034 
2035  if (!OidIsValid(array_typelem))
2036  ereport(ERROR,
2037  (errcode(ERRCODE_DATATYPE_MISMATCH),
2038  errmsg("argument declared %s is not an array but type %s",
2039  "anyarray", format_type_be(context_base_type))));
2040  return array_typelem;
2041  }
2042  else if (context_declared_type == ANYRANGEOID)
2043  {
2044  /* Use the element type corresponding to actual type */
2045  Oid context_base_type = getBaseType(context_actual_type);
2046  Oid range_typelem = get_range_subtype(context_base_type);
2047 
2048  if (!OidIsValid(range_typelem))
2049  ereport(ERROR,
2050  (errcode(ERRCODE_DATATYPE_MISMATCH),
2051  errmsg("argument declared %s is not a range type but type %s",
2052  "anyrange", format_type_be(context_base_type))));
2053  return range_typelem;
2054  }
2055  else if (context_declared_type == ANYELEMENTOID ||
2056  context_declared_type == ANYNONARRAYOID ||
2057  context_declared_type == ANYENUMOID)
2058  {
2059  /* Use the actual type; it doesn't matter if array or not */
2060  return context_actual_type;
2061  }
2062  }
2063  else
2064  {
2065  /* declared_type isn't polymorphic, so return it as-is */
2066  return declared_type;
2067  }
2068  /* If we get here, declared_type is polymorphic and context isn't */
2069  /* NB: this is a calling-code logic error, not a user error */
2070  elog(ERROR, "could not determine polymorphic type because context isn't polymorphic");
2071  return InvalidOid; /* keep compiler quiet */
2072 }
Oid get_element_type(Oid typid)
Definition: lsyscache.c:2526
Oid get_array_type(Oid typid)
Definition: lsyscache.c:2554
int errcode(int sqlerrcode)
Definition: elog.c:570
char * format_type_be(Oid type_oid)
Definition: format_type.c:326
unsigned int Oid
Definition: postgres_ext.h:31
#define OidIsValid(objectId)
Definition: c.h:638
#define ERROR
Definition: elog.h:43
#define ereport(elevel, rest)
Definition: elog.h:141
#define InvalidOid
Definition: postgres_ext.h:36
int errmsg(const char *fmt,...)
Definition: elog.c:784
#define elog(elevel,...)
Definition: elog.h:226
Oid getBaseType(Oid typid)
Definition: lsyscache.c:2299
Oid get_range_subtype(Oid rangeOid)
Definition: lsyscache.c:3135

◆ select_common_type()

Oid select_common_type ( ParseState pstate,
List exprs,
const char *  context,
Node **  which_expr 
)

Definition at line 1275 of file parse_coerce.c.

References Assert, can_coerce_type(), COERCION_IMPLICIT, ereport, errcode(), errmsg(), ERROR, exprLocation(), exprType(), for_each_cell, format_type_be(), get_type_category_preferred(), getBaseType(), InvalidOid, lfirst, linitial, list_second_cell(), NIL, and parser_errposition().

Referenced by buildMergedJoinVar(), transformAExprIn(), transformArrayExpr(), transformCaseExpr(), transformCoalesceExpr(), transformMinMaxExpr(), transformSetOperationTree(), transformValuesClause(), and unify_hypothetical_args().

1277 {
1278  Node *pexpr;
1279  Oid ptype;
1280  TYPCATEGORY pcategory;
1281  bool pispreferred;
1282  ListCell *lc;
1283 
1284  Assert(exprs != NIL);
1285  pexpr = (Node *) linitial(exprs);
1286  lc = list_second_cell(exprs);
1287  ptype = exprType(pexpr);
1288 
1289  /*
1290  * If all input types are valid and exactly the same, just pick that type.
1291  * This is the only way that we will resolve the result as being a domain
1292  * type; otherwise domains are smashed to their base types for comparison.
1293  */
1294  if (ptype != UNKNOWNOID)
1295  {
1296  for_each_cell(lc, exprs, lc)
1297  {
1298  Node *nexpr = (Node *) lfirst(lc);
1299  Oid ntype = exprType(nexpr);
1300 
1301  if (ntype != ptype)
1302  break;
1303  }
1304  if (lc == NULL) /* got to the end of the list? */
1305  {
1306  if (which_expr)
1307  *which_expr = pexpr;
1308  return ptype;
1309  }
1310  }
1311 
1312  /*
1313  * Nope, so set up for the full algorithm. Note that at this point, lc
1314  * points to the first list item with type different from pexpr's; we need
1315  * not re-examine any items the previous loop advanced over.
1316  */
1317  ptype = getBaseType(ptype);
1318  get_type_category_preferred(ptype, &pcategory, &pispreferred);
1319 
1320  for_each_cell(lc, exprs, lc)
1321  {
1322  Node *nexpr = (Node *) lfirst(lc);
1323  Oid ntype = getBaseType(exprType(nexpr));
1324 
1325  /* move on to next one if no new information... */
1326  if (ntype != UNKNOWNOID && ntype != ptype)
1327  {
1328  TYPCATEGORY ncategory;
1329  bool nispreferred;
1330 
1331  get_type_category_preferred(ntype, &ncategory, &nispreferred);
1332  if (ptype == UNKNOWNOID)
1333  {
1334  /* so far, only unknowns so take anything... */
1335  pexpr = nexpr;
1336  ptype = ntype;
1337  pcategory = ncategory;
1338  pispreferred = nispreferred;
1339  }
1340  else if (ncategory != pcategory)
1341  {
1342  /*
1343  * both types in different categories? then not much hope...
1344  */
1345  if (context == NULL)
1346  return InvalidOid;
1347  ereport(ERROR,
1348  (errcode(ERRCODE_DATATYPE_MISMATCH),
1349  /*------
1350  translator: first %s is name of a SQL construct, eg CASE */
1351  errmsg("%s types %s and %s cannot be matched",
1352  context,
1353  format_type_be(ptype),
1354  format_type_be(ntype)),
1355  parser_errposition(pstate, exprLocation(nexpr))));
1356  }
1357  else if (!pispreferred &&
1358  can_coerce_type(1, &ptype, &ntype, COERCION_IMPLICIT) &&
1359  !can_coerce_type(1, &ntype, &ptype, COERCION_IMPLICIT))
1360  {
1361  /*
1362  * take new type if can coerce to it implicitly but not the
1363  * other way; but if we have a preferred type, stay on it.
1364  */
1365  pexpr = nexpr;
1366  ptype = ntype;
1367  pcategory = ncategory;
1368  pispreferred = nispreferred;
1369  }
1370  }
1371  }
1372 
1373  /*
1374  * If all the inputs were UNKNOWN type --- ie, unknown-type literals ---
1375  * then resolve as type TEXT. This situation comes up with constructs
1376  * like SELECT (CASE WHEN foo THEN 'bar' ELSE 'baz' END); SELECT 'foo'
1377  * UNION SELECT 'bar'; It might seem desirable to leave the construct's
1378  * output type as UNKNOWN, but that really doesn't work, because we'd
1379  * probably end up needing a runtime coercion from UNKNOWN to something
1380  * else, and we usually won't have it. We need to coerce the unknown
1381  * literals while they are still literals, so a decision has to be made
1382  * now.
1383  */
1384  if (ptype == UNKNOWNOID)
1385  ptype = TEXTOID;
1386 
1387  if (which_expr)
1388  *which_expr = pexpr;
1389  return ptype;
1390 }
#define NIL
Definition: pg_list.h:65
int exprLocation(const Node *expr)
Definition: nodeFuncs.c:1192
#define for_each_cell(cell, lst, initcell)
Definition: pg_list.h:390
bool can_coerce_type(int nargs, const Oid *input_typeids, const Oid *target_typeids, CoercionContext ccontext)
Definition: parse_coerce.c:543
Definition: nodes.h:525
int errcode(int sqlerrcode)
Definition: elog.c:570
char * format_type_be(Oid type_oid)
Definition: format_type.c:326
unsigned int Oid
Definition: postgres_ext.h:31
char TYPCATEGORY
Definition: parse_coerce.h:21
#define linitial(l)
Definition: pg_list.h:195
#define ERROR
Definition: elog.h:43
static ListCell * list_second_cell(const List *l)
Definition: pg_list.h:139
#define ereport(elevel, rest)
Definition: elog.h:141
#define InvalidOid
Definition: postgres_ext.h:36
#define Assert(condition)
Definition: c.h:732
#define lfirst(lc)
Definition: pg_list.h:190
Oid exprType(const Node *expr)
Definition: nodeFuncs.c:42
int parser_errposition(ParseState *pstate, int location)
Definition: parse_node.c:111
int errmsg(const char *fmt,...)
Definition: elog.c:784
Oid getBaseType(Oid typid)
Definition: lsyscache.c:2299
void get_type_category_preferred(Oid typid, char *typcategory, bool *typispreferred)
Definition: lsyscache.c:2478

◆ TypeCategory()

TYPCATEGORY TypeCategory ( Oid  type)

Definition at line 2081 of file parse_coerce.c.

References Assert, and get_type_category_preferred().

Referenced by find_coercion_pathway(), func_get_detail(), func_select_candidate(), and GetDefaultOpClass().

2082 {
2083  char typcategory;
2084  bool typispreferred;
2085 
2086  get_type_category_preferred(type, &typcategory, &typispreferred);
2087  Assert(typcategory != TYPCATEGORY_INVALID);
2088  return (TYPCATEGORY) typcategory;
2089 }
char TYPCATEGORY
Definition: parse_coerce.h:21
#define Assert(condition)
Definition: c.h:732
void get_type_category_preferred(Oid typid, char *typcategory, bool *typispreferred)
Definition: lsyscache.c:2478