PostgreSQL Source Code  git master
parse_coerce.h File Reference
Include dependency graph for parse_coerce.h:
This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

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, Oid *input_typeids, 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 (Oid *actual_arg_types, Oid *declared_arg_types, int nargs)
 
Oid enforce_generic_type_consistency (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

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,
Oid input_typeids,
Oid target_typeids,
CoercionContext  ccontext 
)

Definition at line 543 of file parse_coerce.c.

References ANYOID, check_generic_type_consistency(), COERCION_PATH_NONE, find_coercion_pathway(), i, is_complex_array(), ISCOMPLEX, IsPolymorphicType, RECORDARRAYOID, RECORDOID, typeInheritsFrom(), typeIsOfTypedTable(), and UNKNOWNOID.

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

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 }
#define RECORDARRAYOID
Definition: pg_type.h:682
unsigned int Oid
Definition: postgres_ext.h:31
CoercionPathType
Definition: parse_coerce.h:24
#define IsPolymorphicType(typid)
Definition: pg_type.h:745
#define ANYOID
Definition: pg_type.h:686
#define RECORDOID
Definition: pg_type.h:680
bool check_generic_type_consistency(Oid *actual_arg_types, Oid *declared_arg_types, int nargs)
bool typeInheritsFrom(Oid subclassTypeId, Oid superclassTypeId)
Definition: pg_inherits.c:311
#define ISCOMPLEX(typeid)
Definition: parse_type.h:55
static bool typeIsOfTypedTable(Oid reltypeId, Oid reloftypeId)
#define UNKNOWNOID
Definition: pg_type.h:431
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 ( Oid actual_arg_types,
Oid declared_arg_types,
int  nargs 
)

Definition at line 1471 of file parse_coerce.c.

References ANYARRAYOID, ANYELEMENTOID, ANYENUMOID, ANYNONARRAYOID, ANYRANGEOID, get_element_type(), get_range_subtype(), getBaseType(), InvalidOid, OidIsValid, type_is_array_domain, type_is_enum(), and UNKNOWNOID.

Referenced by can_coerce_type().

1474 {
1475  int j;
1476  Oid elem_typeid = InvalidOid;
1477  Oid array_typeid = InvalidOid;
1478  Oid array_typelem;
1479  Oid range_typeid = InvalidOid;
1480  Oid range_typelem;
1481  bool have_anyelement = false;
1482  bool have_anynonarray = false;
1483  bool have_anyenum = false;
1484 
1485  /*
1486  * Loop through the arguments to see if we have any that are polymorphic.
1487  * If so, require the actual types to be consistent.
1488  */
1489  for (j = 0; j < nargs; j++)
1490  {
1491  Oid decl_type = declared_arg_types[j];
1492  Oid actual_type = actual_arg_types[j];
1493 
1494  if (decl_type == ANYELEMENTOID ||
1495  decl_type == ANYNONARRAYOID ||
1496  decl_type == ANYENUMOID)
1497  {
1498  have_anyelement = true;
1499  if (decl_type == ANYNONARRAYOID)
1500  have_anynonarray = true;
1501  else if (decl_type == ANYENUMOID)
1502  have_anyenum = true;
1503  if (actual_type == UNKNOWNOID)
1504  continue;
1505  if (OidIsValid(elem_typeid) && actual_type != elem_typeid)
1506  return false;
1507  elem_typeid = actual_type;
1508  }
1509  else if (decl_type == ANYARRAYOID)
1510  {
1511  if (actual_type == UNKNOWNOID)
1512  continue;
1513  actual_type = getBaseType(actual_type); /* flatten domains */
1514  if (OidIsValid(array_typeid) && actual_type != array_typeid)
1515  return false;
1516  array_typeid = actual_type;
1517  }
1518  else if (decl_type == ANYRANGEOID)
1519  {
1520  if (actual_type == UNKNOWNOID)
1521  continue;
1522  actual_type = getBaseType(actual_type); /* flatten domains */
1523  if (OidIsValid(range_typeid) && actual_type != range_typeid)
1524  return false;
1525  range_typeid = actual_type;
1526  }
1527  }
1528 
1529  /* Get the element type based on the array type, if we have one */
1530  if (OidIsValid(array_typeid))
1531  {
1532  if (array_typeid == ANYARRAYOID)
1533  {
1534  /* Special case for ANYARRAY input: okay iff no ANYELEMENT */
1535  if (have_anyelement)
1536  return false;
1537  return true;
1538  }
1539 
1540  array_typelem = get_element_type(array_typeid);
1541  if (!OidIsValid(array_typelem))
1542  return false; /* should be an array, but isn't */
1543 
1544  if (!OidIsValid(elem_typeid))
1545  {
1546  /*
1547  * if we don't have an element type yet, use the one we just got
1548  */
1549  elem_typeid = array_typelem;
1550  }
1551  else if (array_typelem != elem_typeid)
1552  {
1553  /* otherwise, they better match */
1554  return false;
1555  }
1556  }
1557 
1558  /* Get the element type based on the range type, if we have one */
1559  if (OidIsValid(range_typeid))
1560  {
1561  range_typelem = get_range_subtype(range_typeid);
1562  if (!OidIsValid(range_typelem))
1563  return false; /* should be a range, but isn't */
1564 
1565  if (!OidIsValid(elem_typeid))
1566  {
1567  /*
1568  * if we don't have an element type yet, use the one we just got
1569  */
1570  elem_typeid = range_typelem;
1571  }
1572  else if (range_typelem != elem_typeid)
1573  {
1574  /* otherwise, they better match */
1575  return false;
1576  }
1577  }
1578 
1579  if (have_anynonarray)
1580  {
1581  /* require the element type to not be an array or domain over array */
1582  if (type_is_array_domain(elem_typeid))
1583  return false;
1584  }
1585 
1586  if (have_anyenum)
1587  {
1588  /* require the element type to be an enum */
1589  if (!type_is_enum(elem_typeid))
1590  return false;
1591  }
1592 
1593  /* Looks valid */
1594  return true;
1595 }
#define ANYNONARRAYOID
Definition: pg_type.h:704
#define type_is_array_domain(typid)
Definition: lsyscache.h:183
Oid get_element_type(Oid typid)
Definition: lsyscache.c:2517
#define ANYELEMENTOID
Definition: pg_type.h:702
unsigned int Oid
Definition: postgres_ext.h:31
#define OidIsValid(objectId)
Definition: c.h:576
#define ANYRANGEOID
Definition: pg_type.h:714
#define ANYENUMOID
Definition: pg_type.h:706
#define ANYARRAYOID
Definition: pg_type.h:688
#define InvalidOid
Definition: postgres_ext.h:36
bool type_is_enum(Oid typid)
Definition: lsyscache.c:2447
#define UNKNOWNOID
Definition: pg_type.h:431
Oid getBaseType(Oid typid)
Definition: lsyscache.c:2290
Oid get_range_subtype(Oid rangeOid)
Definition: lsyscache.c:3107

◆ coerce_to_boolean()

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

Definition at line 1129 of file parse_coerce.c.

References BOOLOID, 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(), domainAddConstraint(), transformAExprIn(), transformBooleanTest(), transformBoolExpr(), transformCaseExpr(), transformJoinUsingClause(), transformWhereClause(), and transformXmlExpr().

1131 {
1132  Oid inputTypeId = exprType(node);
1133 
1134  if (inputTypeId != BOOLOID)
1135  {
1136  Node *newnode;
1137 
1138  newnode = coerce_to_target_type(pstate, node, inputTypeId,
1139  BOOLOID, -1,
1142  -1);
1143  if (newnode == NULL)
1144  ereport(ERROR,
1145  (errcode(ERRCODE_DATATYPE_MISMATCH),
1146  /* translator: first %s is name of a SQL construct, eg WHERE */
1147  errmsg("argument of %s must be type %s, not type %s",
1148  constructName, "boolean",
1149  format_type_be(inputTypeId)),
1150  parser_errposition(pstate, exprLocation(node))));
1151  node = newnode;
1152  }
1153 
1154  if (expression_returns_set(node))
1155  ereport(ERROR,
1156  (errcode(ERRCODE_DATATYPE_MISMATCH),
1157  /* translator: %s is name of a SQL construct, eg WHERE */
1158  errmsg("argument of %s must not return a set",
1159  constructName),
1160  parser_errposition(pstate, exprLocation(node))));
1161 
1162  return node;
1163 }
int exprLocation(const Node *expr)
Definition: nodeFuncs.c:1186
bool expression_returns_set(Node *clause)
Definition: nodeFuncs.c:670
Definition: nodes.h:512
int errcode(int sqlerrcode)
Definition: elog.c:575
char * format_type_be(Oid type_oid)
Definition: format_type.c:94
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:122
Oid exprType(const Node *expr)
Definition: nodeFuncs.c:42
int parser_errposition(ParseState *pstate, int location)
Definition: parse_node.c:111
#define BOOLOID
Definition: pg_type.h:288
int errmsg(const char *fmt,...)
Definition: elog.c:797

◆ coerce_to_common_type()

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

Definition at line 1400 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().

1402 {
1403  Oid inputTypeId = exprType(node);
1404 
1405  if (inputTypeId == targetTypeId)
1406  return node; /* no work */
1407  if (can_coerce_type(1, &inputTypeId, &targetTypeId, COERCION_IMPLICIT))
1408  node = coerce_type(pstate, node, inputTypeId, targetTypeId, -1,
1410  else
1411  ereport(ERROR,
1412  (errcode(ERRCODE_CANNOT_COERCE),
1413  /* translator: first %s is name of a SQL construct, eg CASE */
1414  errmsg("%s could not convert type %s to %s",
1415  context,
1416  format_type_be(inputTypeId),
1417  format_type_be(targetTypeId)),
1418  parser_errposition(pstate, exprLocation(node))));
1419  return node;
1420 }
int exprLocation(const Node *expr)
Definition: nodeFuncs.c:1186
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:575
char * format_type_be(Oid type_oid)
Definition: format_type.c:94
unsigned int Oid
Definition: postgres_ext.h:31
#define ERROR
Definition: elog.h:43
#define ereport(elevel, rest)
Definition: elog.h:122
Oid exprType(const Node *expr)
Definition: nodeFuncs.c:42
int parser_errposition(ParseState *pstate, int location)
Definition: parse_node.c:111
bool can_coerce_type(int nargs, Oid *input_typeids, Oid *target_typeids, CoercionContext ccontext)
Definition: parse_coerce.c:543
int errmsg(const char *fmt,...)
Definition: elog.c:797

◆ 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:2307
int32 resulttypmod
Definition: primnodes.h:1229
Definition: nodes.h:512
CoercionForm coercionformat
Definition: primnodes.h:1231
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:560
void * arg

◆ coerce_to_specific_type()

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

Definition at line 1225 of file parse_coerce.c.

References coerce_to_specific_type_typmod().

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

1228 {
1229  return coerce_to_specific_type_typmod(pstate, node,
1230  targetTypeId, -1,
1231  constructName);
1232 }
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 1176 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().

1179 {
1180  Oid inputTypeId = exprType(node);
1181 
1182  if (inputTypeId != targetTypeId)
1183  {
1184  Node *newnode;
1185 
1186  newnode = coerce_to_target_type(pstate, node, inputTypeId,
1187  targetTypeId, targetTypmod,
1190  -1);
1191  if (newnode == NULL)
1192  ereport(ERROR,
1193  (errcode(ERRCODE_DATATYPE_MISMATCH),
1194  /* translator: first %s is name of a SQL construct, eg LIMIT */
1195  errmsg("argument of %s must be type %s, not type %s",
1196  constructName,
1197  format_type_be(targetTypeId),
1198  format_type_be(inputTypeId)),
1199  parser_errposition(pstate, exprLocation(node))));
1200  node = newnode;
1201  }
1202 
1203  if (expression_returns_set(node))
1204  ereport(ERROR,
1205  (errcode(ERRCODE_DATATYPE_MISMATCH),
1206  /* translator: %s is name of a SQL construct, eg LIMIT */
1207  errmsg("argument of %s must not return a set",
1208  constructName),
1209  parser_errposition(pstate, exprLocation(node))));
1210 
1211  return node;
1212 }
int exprLocation(const Node *expr)
Definition: nodeFuncs.c:1186
bool expression_returns_set(Node *clause)
Definition: nodeFuncs.c:670
Definition: nodes.h:512
int errcode(int sqlerrcode)
Definition: elog.c:575
char * format_type_be(Oid type_oid)
Definition: format_type.c:94
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:122
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:797

◆ 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(), transformArraySubscripts(), transformAssignedExpr(), transformAssignmentIndirection(), transformAssignmentSubscripts(), 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:563
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:512
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:560
Expr * arg
Definition: primnodes.h:880
bool can_coerce_type(int nargs, Oid *input_typeids, Oid *target_typeids, CoercionContext ccontext)
Definition: parse_coerce.c:543
void * arg
int location
Definition: primnodes.h:882

◆ 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 ANYARRAYOID, ANYELEMENTOID, ANYENUMOID, ANYNONARRAYOID, ANYOID, ANYRANGEOID, 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(), INTERVALOID, 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, RECORDARRAYOID, RECORDOID, ReleaseSysCache(), ConvertRowtypeExpr::resulttype, setup_parser_errposition_callback(), stringTypeDatum(), typeByVal(), typeidType(), typeInheritsFrom(), typeIsOfTypedTable(), typeLen(), typeTypeCollation(), typeTypeName(), UNKNOWNOID, 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:196
#define RECORDARRAYOID
Definition: pg_type.h:682
#define ANYNONARRAYOID
Definition: pg_type.h:704
Oid getBaseTypeAndTypmod(Oid typid, int32 *typmod)
Definition: lsyscache.c:2307
Oid typeTypeCollation(Type typ)
Definition: parse_type.c:621
#define IsA(nodeptr, _type_)
Definition: nodes.h:563
bool constbyval
Definition: primnodes.h:199
int16 typeLen(Type t)
Definition: parse_type.c:580
#define PointerGetDatum(X)
Definition: postgres.h:562
#define ANYELEMENTOID
Definition: pg_type.h:702
bool datumIsEqual(Datum value1, Datum value2, bool typByVal, int typLen)
Definition: datum.c:219
CoerceParamHook p_coerce_param_hook
Definition: parse_node.h:214
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:512
char * format_type_be(Oid type_oid)
Definition: format_type.c:94
unsigned int Oid
Definition: postgres_ext.h:31
CoercionPathType
Definition: parse_coerce.h:24
signed int int32
Definition: c.h:284
int constlen
Definition: primnodes.h:195
Oid consttype
Definition: primnodes.h:192
void cancel_parser_errposition_callback(ParseCallbackState *pcbstate)
Definition: parse_node.c:161
bool typeByVal(Type t)
Definition: parse_type.c:590
#define ERROR
Definition: elog.h:43
#define DatumGetCString(X)
Definition: postgres.h:572
#define ANYRANGEOID
Definition: pg_type.h:714
char * typeTypeName(Type t)
Definition: parse_type.c:600
Datum stringTypeDatum(Type tp, char *string, int32 atttypmod)
Definition: parse_type.c:635
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:194
#define ANYENUMOID
Definition: pg_type.h:706
RelabelType * makeRelabelType(Expr *arg, Oid rtype, int32 rtypmod, Oid rcollid, CoercionForm rformat)
Definition: makefuncs.c:401
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
#define INTERVALOID
Definition: pg_type.h:529
#define ANYOID
Definition: pg_type.h:686
#define RECORDOID
Definition: pg_type.h:680
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:203
#define ANYARRAYOID
Definition: pg_type.h:688
uintptr_t Datum
Definition: postgres.h:372
CoercionForm convertformat
Definition: primnodes.h:866
void ReleaseSysCache(HeapTuple tuple)
Definition: syscache.c:1160
#define InvalidOid
Definition: postgres_ext.h:36
#define makeNode(_type_)
Definition: nodes.h:560
bool typeInheritsFrom(Oid subclassTypeId, Oid superclassTypeId)
Definition: pg_inherits.c:311
#define ISCOMPLEX(typeid)
Definition: parse_type.h:55
static bool typeIsOfTypedTable(Oid reltypeId, Oid reloftypeId)
Expr * arg
Definition: primnodes.h:880
#define UNKNOWNOID
Definition: pg_type.h:431
static Node * coerce_record_to_complex(ParseState *pstate, Node *node, Oid targetTypeId, CoercionContext ccontext, CoercionForm cformat, int location)
Definition: parse_coerce.c:979
int32 consttypmod
Definition: primnodes.h:193
CoercionPathType find_coercion_pathway(Oid targetTypeId, Oid sourceTypeId, CoercionContext ccontext, Oid *funcid)
#define PG_DETOAST_DATUM(datum)
Definition: fmgr.h:205
#define elog
Definition: elog.h:219
static bool is_complex_array(Oid typid)
Type typeidType(Oid id)
Definition: parse_type.c:559
int location
Definition: primnodes.h:882
Oid getBaseType(Oid typid)
Definition: lsyscache.c:2290
int location
Definition: primnodes.h:799
bool constisnull
Definition: primnodes.h:197

◆ enforce_generic_type_consistency()

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

Definition at line 1668 of file parse_coerce.c.

References ANYARRAYOID, ANYELEMENTOID, ANYENUMOID, ANYNONARRAYOID, ANYRANGEOID, ereport, errcode(), errdetail(), errmsg(), ERROR, format_type_be(), get_array_type(), get_element_type(), get_range_subtype(), getBaseType(), InvalidOid, OidIsValid, type_is_array_domain, type_is_enum(), and UNKNOWNOID.

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

1673 {
1674  int j;
1675  bool have_generics = false;
1676  bool have_unknowns = false;
1677  Oid elem_typeid = InvalidOid;
1678  Oid array_typeid = InvalidOid;
1679  Oid range_typeid = InvalidOid;
1680  Oid array_typelem;
1681  Oid range_typelem;
1682  bool have_anyelement = (rettype == ANYELEMENTOID ||
1683  rettype == ANYNONARRAYOID ||
1684  rettype == ANYENUMOID);
1685  bool have_anynonarray = (rettype == ANYNONARRAYOID);
1686  bool have_anyenum = (rettype == ANYENUMOID);
1687 
1688  /*
1689  * Loop through the arguments to see if we have any that are polymorphic.
1690  * If so, require the actual types to be consistent.
1691  */
1692  for (j = 0; j < nargs; j++)
1693  {
1694  Oid decl_type = declared_arg_types[j];
1695  Oid actual_type = actual_arg_types[j];
1696 
1697  if (decl_type == ANYELEMENTOID ||
1698  decl_type == ANYNONARRAYOID ||
1699  decl_type == ANYENUMOID)
1700  {
1701  have_generics = have_anyelement = true;
1702  if (decl_type == ANYNONARRAYOID)
1703  have_anynonarray = true;
1704  else if (decl_type == ANYENUMOID)
1705  have_anyenum = true;
1706  if (actual_type == UNKNOWNOID)
1707  {
1708  have_unknowns = true;
1709  continue;
1710  }
1711  if (allow_poly && decl_type == actual_type)
1712  continue; /* no new information here */
1713  if (OidIsValid(elem_typeid) && actual_type != elem_typeid)
1714  ereport(ERROR,
1715  (errcode(ERRCODE_DATATYPE_MISMATCH),
1716  errmsg("arguments declared \"anyelement\" are not all alike"),
1717  errdetail("%s versus %s",
1718  format_type_be(elem_typeid),
1719  format_type_be(actual_type))));
1720  elem_typeid = actual_type;
1721  }
1722  else if (decl_type == ANYARRAYOID)
1723  {
1724  have_generics = true;
1725  if (actual_type == UNKNOWNOID)
1726  {
1727  have_unknowns = true;
1728  continue;
1729  }
1730  if (allow_poly && decl_type == actual_type)
1731  continue; /* no new information here */
1732  actual_type = getBaseType(actual_type); /* flatten domains */
1733  if (OidIsValid(array_typeid) && actual_type != array_typeid)
1734  ereport(ERROR,
1735  (errcode(ERRCODE_DATATYPE_MISMATCH),
1736  errmsg("arguments declared \"anyarray\" are not all alike"),
1737  errdetail("%s versus %s",
1738  format_type_be(array_typeid),
1739  format_type_be(actual_type))));
1740  array_typeid = actual_type;
1741  }
1742  else if (decl_type == ANYRANGEOID)
1743  {
1744  have_generics = true;
1745  if (actual_type == UNKNOWNOID)
1746  {
1747  have_unknowns = true;
1748  continue;
1749  }
1750  if (allow_poly && decl_type == actual_type)
1751  continue; /* no new information here */
1752  actual_type = getBaseType(actual_type); /* flatten domains */
1753  if (OidIsValid(range_typeid) && actual_type != range_typeid)
1754  ereport(ERROR,
1755  (errcode(ERRCODE_DATATYPE_MISMATCH),
1756  errmsg("arguments declared \"anyrange\" are not all alike"),
1757  errdetail("%s versus %s",
1758  format_type_be(range_typeid),
1759  format_type_be(actual_type))));
1760  range_typeid = actual_type;
1761  }
1762  }
1763 
1764  /*
1765  * Fast Track: if none of the arguments are polymorphic, return the
1766  * unmodified rettype. We assume it can't be polymorphic either.
1767  */
1768  if (!have_generics)
1769  return rettype;
1770 
1771  /* Get the element type based on the array type, if we have one */
1772  if (OidIsValid(array_typeid))
1773  {
1774  if (array_typeid == ANYARRAYOID && !have_anyelement)
1775  {
1776  /* Special case for ANYARRAY input: okay iff no ANYELEMENT */
1777  array_typelem = ANYELEMENTOID;
1778  }
1779  else
1780  {
1781  array_typelem = get_element_type(array_typeid);
1782  if (!OidIsValid(array_typelem))
1783  ereport(ERROR,
1784  (errcode(ERRCODE_DATATYPE_MISMATCH),
1785  errmsg("argument declared %s is not an array but type %s",
1786  "anyarray", format_type_be(array_typeid))));
1787  }
1788 
1789  if (!OidIsValid(elem_typeid))
1790  {
1791  /*
1792  * if we don't have an element type yet, use the one we just got
1793  */
1794  elem_typeid = array_typelem;
1795  }
1796  else if (array_typelem != elem_typeid)
1797  {
1798  /* otherwise, they better match */
1799  ereport(ERROR,
1800  (errcode(ERRCODE_DATATYPE_MISMATCH),
1801  errmsg("argument declared %s is not consistent with argument declared %s",
1802  "anyarray", "anyelement"),
1803  errdetail("%s versus %s",
1804  format_type_be(array_typeid),
1805  format_type_be(elem_typeid))));
1806  }
1807  }
1808 
1809  /* Get the element type based on the range type, if we have one */
1810  if (OidIsValid(range_typeid))
1811  {
1812  if (range_typeid == ANYRANGEOID && !have_anyelement)
1813  {
1814  /* Special case for ANYRANGE input: okay iff no ANYELEMENT */
1815  range_typelem = ANYELEMENTOID;
1816  }
1817  else
1818  {
1819  range_typelem = get_range_subtype(range_typeid);
1820  if (!OidIsValid(range_typelem))
1821  ereport(ERROR,
1822  (errcode(ERRCODE_DATATYPE_MISMATCH),
1823  errmsg("argument declared %s is not a range type but type %s",
1824  "anyrange",
1825  format_type_be(range_typeid))));
1826  }
1827 
1828  if (!OidIsValid(elem_typeid))
1829  {
1830  /*
1831  * if we don't have an element type yet, use the one we just got
1832  */
1833  elem_typeid = range_typelem;
1834  }
1835  else if (range_typelem != elem_typeid)
1836  {
1837  /* otherwise, they better match */
1838  ereport(ERROR,
1839  (errcode(ERRCODE_DATATYPE_MISMATCH),
1840  errmsg("argument declared %s is not consistent with argument declared %s",
1841  "anyrange", "anyelement"),
1842  errdetail("%s versus %s",
1843  format_type_be(range_typeid),
1844  format_type_be(elem_typeid))));
1845  }
1846  }
1847 
1848  if (!OidIsValid(elem_typeid))
1849  {
1850  if (allow_poly)
1851  {
1852  elem_typeid = ANYELEMENTOID;
1853  array_typeid = ANYARRAYOID;
1854  range_typeid = ANYRANGEOID;
1855  }
1856  else
1857  {
1858  /* Only way to get here is if all the generic args are UNKNOWN */
1859  ereport(ERROR,
1860  (errcode(ERRCODE_DATATYPE_MISMATCH),
1861  errmsg("could not determine polymorphic type because input has type %s",
1862  "unknown")));
1863  }
1864  }
1865 
1866  if (have_anynonarray && elem_typeid != ANYELEMENTOID)
1867  {
1868  /* require the element type to not be an array or domain over array */
1869  if (type_is_array_domain(elem_typeid))
1870  ereport(ERROR,
1871  (errcode(ERRCODE_DATATYPE_MISMATCH),
1872  errmsg("type matched to anynonarray is an array type: %s",
1873  format_type_be(elem_typeid))));
1874  }
1875 
1876  if (have_anyenum && elem_typeid != ANYELEMENTOID)
1877  {
1878  /* require the element type to be an enum */
1879  if (!type_is_enum(elem_typeid))
1880  ereport(ERROR,
1881  (errcode(ERRCODE_DATATYPE_MISMATCH),
1882  errmsg("type matched to anyenum is not an enum type: %s",
1883  format_type_be(elem_typeid))));
1884  }
1885 
1886  /*
1887  * If we had any unknown inputs, re-scan to assign correct types
1888  */
1889  if (have_unknowns)
1890  {
1891  for (j = 0; j < nargs; j++)
1892  {
1893  Oid decl_type = declared_arg_types[j];
1894  Oid actual_type = actual_arg_types[j];
1895 
1896  if (actual_type != UNKNOWNOID)
1897  continue;
1898 
1899  if (decl_type == ANYELEMENTOID ||
1900  decl_type == ANYNONARRAYOID ||
1901  decl_type == ANYENUMOID)
1902  declared_arg_types[j] = elem_typeid;
1903  else if (decl_type == ANYARRAYOID)
1904  {
1905  if (!OidIsValid(array_typeid))
1906  {
1907  array_typeid = get_array_type(elem_typeid);
1908  if (!OidIsValid(array_typeid))
1909  ereport(ERROR,
1910  (errcode(ERRCODE_UNDEFINED_OBJECT),
1911  errmsg("could not find array type for data type %s",
1912  format_type_be(elem_typeid))));
1913  }
1914  declared_arg_types[j] = array_typeid;
1915  }
1916  else if (decl_type == ANYRANGEOID)
1917  {
1918  if (!OidIsValid(range_typeid))
1919  {
1920  ereport(ERROR,
1921  (errcode(ERRCODE_UNDEFINED_OBJECT),
1922  errmsg("could not find range type for data type %s",
1923  format_type_be(elem_typeid))));
1924  }
1925  declared_arg_types[j] = range_typeid;
1926  }
1927  }
1928  }
1929 
1930  /* if we return ANYARRAY use the appropriate argument type */
1931  if (rettype == ANYARRAYOID)
1932  {
1933  if (!OidIsValid(array_typeid))
1934  {
1935  array_typeid = get_array_type(elem_typeid);
1936  if (!OidIsValid(array_typeid))
1937  ereport(ERROR,
1938  (errcode(ERRCODE_UNDEFINED_OBJECT),
1939  errmsg("could not find array type for data type %s",
1940  format_type_be(elem_typeid))));
1941  }
1942  return array_typeid;
1943  }
1944 
1945  /* if we return ANYRANGE use the appropriate argument type */
1946  if (rettype == ANYRANGEOID)
1947  {
1948  if (!OidIsValid(range_typeid))
1949  {
1950  ereport(ERROR,
1951  (errcode(ERRCODE_UNDEFINED_OBJECT),
1952  errmsg("could not find range type for data type %s",
1953  format_type_be(elem_typeid))));
1954  }
1955  return range_typeid;
1956  }
1957 
1958  /* if we return ANYELEMENT use the appropriate argument type */
1959  if (rettype == ANYELEMENTOID ||
1960  rettype == ANYNONARRAYOID ||
1961  rettype == ANYENUMOID)
1962  return elem_typeid;
1963 
1964  /* we don't return a generic type; send back the original return type */
1965  return rettype;
1966 }
#define ANYNONARRAYOID
Definition: pg_type.h:704
#define type_is_array_domain(typid)
Definition: lsyscache.h:183
Oid get_element_type(Oid typid)
Definition: lsyscache.c:2517
Oid get_array_type(Oid typid)
Definition: lsyscache.c:2545
#define ANYELEMENTOID
Definition: pg_type.h:702
int errcode(int sqlerrcode)
Definition: elog.c:575
char * format_type_be(Oid type_oid)
Definition: format_type.c:94
unsigned int Oid
Definition: postgres_ext.h:31
#define OidIsValid(objectId)
Definition: c.h:576
#define ERROR
Definition: elog.h:43
#define ANYRANGEOID
Definition: pg_type.h:714
#define ANYENUMOID
Definition: pg_type.h:706
int errdetail(const char *fmt,...)
Definition: elog.c:873
#define ereport(elevel, rest)
Definition: elog.h:122
#define ANYARRAYOID
Definition: pg_type.h:688
#define InvalidOid
Definition: postgres_ext.h:36
bool type_is_enum(Oid typid)
Definition: lsyscache.c:2447
#define UNKNOWNOID
Definition: pg_type.h:431
int errmsg(const char *fmt,...)
Definition: elog.c:797
Oid getBaseType(Oid typid)
Definition: lsyscache.c:2290
Oid get_range_subtype(Oid rangeOid)
Definition: lsyscache.c:3107

◆ find_coercion_pathway()

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

Definition at line 2227 of file parse_coerce.c.

References CASTSOURCETARGET, COERCION_ASSIGNMENT, COERCION_CODE_ASSIGNMENT, COERCION_CODE_EXPLICIT, COERCION_CODE_IMPLICIT, COERCION_EXPLICIT, COERCION_IMPLICIT, COERCION_METHOD_BINARY, COERCION_METHOD_FUNCTION, COERCION_METHOD_INOUT, 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, INT2VECTOROID, InvalidOid, ObjectIdGetDatum, OidIsValid, OIDVECTOROID, ReleaseSysCache(), SearchSysCache2(), TYPCATEGORY_STRING, 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().

2230 {
2232  HeapTuple tuple;
2233 
2234  *funcid = InvalidOid;
2235 
2236  /* Perhaps the types are domains; if so, look at their base types */
2237  if (OidIsValid(sourceTypeId))
2238  sourceTypeId = getBaseType(sourceTypeId);
2239  if (OidIsValid(targetTypeId))
2240  targetTypeId = getBaseType(targetTypeId);
2241 
2242  /* Domains are always coercible to and from their base type */
2243  if (sourceTypeId == targetTypeId)
2245 
2246  /* Look in pg_cast */
2248  ObjectIdGetDatum(sourceTypeId),
2249  ObjectIdGetDatum(targetTypeId));
2250 
2251  if (HeapTupleIsValid(tuple))
2252  {
2253  Form_pg_cast castForm = (Form_pg_cast) GETSTRUCT(tuple);
2254  CoercionContext castcontext;
2255 
2256  /* convert char value for castcontext to CoercionContext enum */
2257  switch (castForm->castcontext)
2258  {
2260  castcontext = COERCION_IMPLICIT;
2261  break;
2263  castcontext = COERCION_ASSIGNMENT;
2264  break;
2266  castcontext = COERCION_EXPLICIT;
2267  break;
2268  default:
2269  elog(ERROR, "unrecognized castcontext: %d",
2270  (int) castForm->castcontext);
2271  castcontext = 0; /* keep compiler quiet */
2272  break;
2273  }
2274 
2275  /* Rely on ordering of enum for correct behavior here */
2276  if (ccontext >= castcontext)
2277  {
2278  switch (castForm->castmethod)
2279  {
2281  result = COERCION_PATH_FUNC;
2282  *funcid = castForm->castfunc;
2283  break;
2284  case COERCION_METHOD_INOUT:
2285  result = COERCION_PATH_COERCEVIAIO;
2286  break;
2288  result = COERCION_PATH_RELABELTYPE;
2289  break;
2290  default:
2291  elog(ERROR, "unrecognized castmethod: %d",
2292  (int) castForm->castmethod);
2293  break;
2294  }
2295  }
2296 
2297  ReleaseSysCache(tuple);
2298  }
2299  else
2300  {
2301  /*
2302  * If there's no pg_cast entry, perhaps we are dealing with a pair of
2303  * array types. If so, and if their element types have a conversion
2304  * pathway, report that we can coerce with an ArrayCoerceExpr.
2305  *
2306  * Hack: disallow coercions to oidvector and int2vector, which
2307  * otherwise tend to capture coercions that should go to "real" array
2308  * types. We want those types to be considered "real" arrays for many
2309  * purposes, but not this one. (Also, ArrayCoerceExpr isn't
2310  * guaranteed to produce an output that meets the restrictions of
2311  * these datatypes, such as being 1-dimensional.)
2312  */
2313  if (targetTypeId != OIDVECTOROID && targetTypeId != INT2VECTOROID)
2314  {
2315  Oid targetElem;
2316  Oid sourceElem;
2317 
2318  if ((targetElem = get_element_type(targetTypeId)) != InvalidOid &&
2319  (sourceElem = get_element_type(sourceTypeId)) != InvalidOid)
2320  {
2321  CoercionPathType elempathtype;
2322  Oid elemfuncid;
2323 
2324  elempathtype = find_coercion_pathway(targetElem,
2325  sourceElem,
2326  ccontext,
2327  &elemfuncid);
2328  if (elempathtype != COERCION_PATH_NONE)
2329  {
2330  result = COERCION_PATH_ARRAYCOERCE;
2331  }
2332  }
2333  }
2334 
2335  /*
2336  * If we still haven't found a possibility, consider automatic casting
2337  * using I/O functions. We allow assignment casts to string types and
2338  * explicit casts from string types to be handled this way. (The
2339  * CoerceViaIO mechanism is a lot more general than that, but this is
2340  * all we want to allow in the absence of a pg_cast entry.) It would
2341  * probably be better to insist on explicit casts in both directions,
2342  * but this is a compromise to preserve something of the pre-8.3
2343  * behavior that many types had implicit (yipes!) casts to text.
2344  */
2345  if (result == COERCION_PATH_NONE)
2346  {
2347  if (ccontext >= COERCION_ASSIGNMENT &&
2348  TypeCategory(targetTypeId) == TYPCATEGORY_STRING)
2349  result = COERCION_PATH_COERCEVIAIO;
2350  else if (ccontext >= COERCION_EXPLICIT &&
2351  TypeCategory(sourceTypeId) == TYPCATEGORY_STRING)
2352  result = COERCION_PATH_COERCEVIAIO;
2353  }
2354  }
2355 
2356  return result;
2357 }
#define INT2VECTOROID
Definition: pg_type.h:312
#define GETSTRUCT(TUP)
Definition: htup_details.h:661
Oid get_element_type(Oid typid)
Definition: lsyscache.c:2517
unsigned int Oid
Definition: postgres_ext.h:31
#define OidIsValid(objectId)
Definition: c.h:576
CoercionContext
Definition: primnodes.h:420
CoercionPathType
Definition: parse_coerce.h:24
#define OIDVECTOROID
Definition: pg_type.h:344
#define ObjectIdGetDatum(X)
Definition: postgres.h:513
#define ERROR
Definition: elog.h:43
FormData_pg_cast * Form_pg_cast
Definition: pg_cast.h:42
void ReleaseSysCache(HeapTuple tuple)
Definition: syscache.c:1160
#define InvalidOid
Definition: postgres_ext.h:36
TYPCATEGORY TypeCategory(Oid type)
#define TYPCATEGORY_STRING
Definition: pg_type.h:738
#define HeapTupleIsValid(tuple)
Definition: htup.h:77
HeapTuple SearchSysCache2(int cacheId, Datum key1, Datum key2)
Definition: syscache.c:1123
CoercionPathType find_coercion_pathway(Oid targetTypeId, Oid sourceTypeId, CoercionContext ccontext, Oid *funcid)
#define elog
Definition: elog.h:219
Oid getBaseType(Oid typid)
Definition: lsyscache.c:2290

◆ find_typmod_coercion_function()

CoercionPathType find_typmod_coercion_function ( Oid  typeId,
Oid funcid 
)

Definition at line 2382 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().

2384 {
2385  CoercionPathType result;
2386  Type targetType;
2387  Form_pg_type typeForm;
2388  HeapTuple tuple;
2389 
2390  *funcid = InvalidOid;
2391  result = COERCION_PATH_FUNC;
2392 
2393  targetType = typeidType(typeId);
2394  typeForm = (Form_pg_type) GETSTRUCT(targetType);
2395 
2396  /* Check for a varlena array type */
2397  if (typeForm->typelem != InvalidOid && typeForm->typlen == -1)
2398  {
2399  /* Yes, switch our attention to the element type */
2400  typeId = typeForm->typelem;
2401  result = COERCION_PATH_ARRAYCOERCE;
2402  }
2403  ReleaseSysCache(targetType);
2404 
2405  /* Look in pg_cast */
2407  ObjectIdGetDatum(typeId),
2408  ObjectIdGetDatum(typeId));
2409 
2410  if (HeapTupleIsValid(tuple))
2411  {
2412  Form_pg_cast castForm = (Form_pg_cast) GETSTRUCT(tuple);
2413 
2414  *funcid = castForm->castfunc;
2415  ReleaseSysCache(tuple);
2416  }
2417 
2418  if (!OidIsValid(*funcid))
2419  result = COERCION_PATH_NONE;
2420 
2421  return result;
2422 }
#define GETSTRUCT(TUP)
Definition: htup_details.h:661
FormData_pg_type * Form_pg_type
Definition: pg_type.h:233
#define OidIsValid(objectId)
Definition: c.h:576
CoercionPathType
Definition: parse_coerce.h:24
#define ObjectIdGetDatum(X)
Definition: postgres.h:513
FormData_pg_cast * Form_pg_cast
Definition: pg_cast.h:42
void ReleaseSysCache(HeapTuple tuple)
Definition: syscache.c:1160
#define InvalidOid
Definition: postgres_ext.h:36
#define HeapTupleIsValid(tuple)
Definition: htup.h:77
HeapTuple SearchSysCache2(int cacheId, Datum key1, Datum key2)
Definition: syscache.c:1123
Type typeidType(Oid id)
Definition: parse_type.c:559

◆ IsBinaryCoercible()

bool IsBinaryCoercible ( Oid  srctype,
Oid  targettype 
)

Definition at line 2131 of file parse_coerce.c.

References ANYARRAYOID, ANYELEMENTOID, ANYENUMOID, ANYNONARRAYOID, ANYOID, ANYRANGEOID, CASTSOURCETARGET, COERCION_CODE_IMPLICIT, COERCION_METHOD_BINARY, getBaseType(), GETSTRUCT, HeapTupleIsValid, is_complex_array(), ISCOMPLEX, ObjectIdGetDatum, OidIsValid, RECORDARRAYOID, RECORDOID, 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().

2132 {
2133  HeapTuple tuple;
2134  Form_pg_cast castForm;
2135  bool result;
2136 
2137  /* Fast path if same type */
2138  if (srctype == targettype)
2139  return true;
2140 
2141  /* Anything is coercible to ANY or ANYELEMENT */
2142  if (targettype == ANYOID || targettype == ANYELEMENTOID)
2143  return true;
2144 
2145  /* If srctype is a domain, reduce to its base type */
2146  if (OidIsValid(srctype))
2147  srctype = getBaseType(srctype);
2148 
2149  /* Somewhat-fast path for domain -> base type case */
2150  if (srctype == targettype)
2151  return true;
2152 
2153  /* Also accept any array type as coercible to ANYARRAY */
2154  if (targettype == ANYARRAYOID)
2155  if (type_is_array(srctype))
2156  return true;
2157 
2158  /* Also accept any non-array type as coercible to ANYNONARRAY */
2159  if (targettype == ANYNONARRAYOID)
2160  if (!type_is_array(srctype))
2161  return true;
2162 
2163  /* Also accept any enum type as coercible to ANYENUM */
2164  if (targettype == ANYENUMOID)
2165  if (type_is_enum(srctype))
2166  return true;
2167 
2168  /* Also accept any range type as coercible to ANYRANGE */
2169  if (targettype == ANYRANGEOID)
2170  if (type_is_range(srctype))
2171  return true;
2172 
2173  /* Also accept any composite type as coercible to RECORD */
2174  if (targettype == RECORDOID)
2175  if (ISCOMPLEX(srctype))
2176  return true;
2177 
2178  /* Also accept any composite array type as coercible to RECORD[] */
2179  if (targettype == RECORDARRAYOID)
2180  if (is_complex_array(srctype))
2181  return true;
2182 
2183  /* Else look in pg_cast */
2185  ObjectIdGetDatum(srctype),
2186  ObjectIdGetDatum(targettype));
2187  if (!HeapTupleIsValid(tuple))
2188  return false; /* no cast */
2189  castForm = (Form_pg_cast) GETSTRUCT(tuple);
2190 
2191  result = (castForm->castmethod == COERCION_METHOD_BINARY &&
2192  castForm->castcontext == COERCION_CODE_IMPLICIT);
2193 
2194  ReleaseSysCache(tuple);
2195 
2196  return result;
2197 }
#define RECORDARRAYOID
Definition: pg_type.h:682
#define ANYNONARRAYOID
Definition: pg_type.h:704
#define GETSTRUCT(TUP)
Definition: htup_details.h:661
#define ANYELEMENTOID
Definition: pg_type.h:702
bool type_is_range(Oid typid)
Definition: lsyscache.c:2457
#define OidIsValid(objectId)
Definition: c.h:576
#define ObjectIdGetDatum(X)
Definition: postgres.h:513
#define ANYRANGEOID
Definition: pg_type.h:714
#define ANYENUMOID
Definition: pg_type.h:706
#define ANYOID
Definition: pg_type.h:686
#define RECORDOID
Definition: pg_type.h:680
FormData_pg_cast * Form_pg_cast
Definition: pg_cast.h:42
#define ANYARRAYOID
Definition: pg_type.h:688
void ReleaseSysCache(HeapTuple tuple)
Definition: syscache.c:1160
#define HeapTupleIsValid(tuple)
Definition: htup.h:77
#define ISCOMPLEX(typeid)
Definition: parse_type.h:55
bool type_is_enum(Oid typid)
Definition: lsyscache.c:2447
HeapTuple SearchSysCache2(int cacheId, Datum key1, Datum key2)
Definition: syscache.c:1123
#define type_is_array(typid)
Definition: lsyscache.h:181
static bool is_complex_array(Oid typid)
Oid getBaseType(Oid typid)
Definition: lsyscache.c:2290

◆ IsPreferredType()

bool IsPreferredType ( TYPCATEGORY  category,
Oid  type 
)

Definition at line 2096 of file parse_coerce.c.

References get_type_category_preferred(), and TYPCATEGORY_INVALID.

Referenced by func_select_candidate(), and GetDefaultOpClass().

2097 {
2098  char typcategory;
2099  bool typispreferred;
2100 
2101  get_type_category_preferred(type, &typcategory, &typispreferred);
2102  if (category == typcategory || category == TYPCATEGORY_INVALID)
2103  return typispreferred;
2104  else
2105  return false;
2106 }
#define TYPCATEGORY_INVALID
Definition: pg_type.h:727
void get_type_category_preferred(Oid typid, char *typcategory, bool *typispreferred)
Definition: lsyscache.c:2469

◆ parser_coercion_errposition()

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

Definition at line 1245 of file parse_coerce.c.

References exprLocation(), and parser_errposition().

Referenced by coerce_record_to_complex(), and transformTypeCast().

1248 {
1249  if (coerce_location >= 0)
1250  return parser_errposition(pstate, coerce_location);
1251  else
1252  return parser_errposition(pstate, exprLocation(input_expr));
1253 }
int exprLocation(const Node *expr)
Definition: nodeFuncs.c:1186
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 1982 of file parse_coerce.c.

References ANYARRAYOID, ANYELEMENTOID, ANYENUMOID, ANYNONARRAYOID, ANYRANGEOID, 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().

1985 {
1986  if (declared_type == ANYARRAYOID)
1987  {
1988  if (context_declared_type == ANYARRAYOID)
1989  {
1990  /*
1991  * Use actual type, but it must be an array; or if it's a domain
1992  * over array, use the base array type.
1993  */
1994  Oid context_base_type = getBaseType(context_actual_type);
1995  Oid array_typelem = get_element_type(context_base_type);
1996 
1997  if (!OidIsValid(array_typelem))
1998  ereport(ERROR,
1999  (errcode(ERRCODE_DATATYPE_MISMATCH),
2000  errmsg("argument declared %s is not an array but type %s",
2001  "anyarray", format_type_be(context_base_type))));
2002  return context_base_type;
2003  }
2004  else if (context_declared_type == ANYELEMENTOID ||
2005  context_declared_type == ANYNONARRAYOID ||
2006  context_declared_type == ANYENUMOID ||
2007  context_declared_type == ANYRANGEOID)
2008  {
2009  /* Use the array type corresponding to actual type */
2010  Oid array_typeid = get_array_type(context_actual_type);
2011 
2012  if (!OidIsValid(array_typeid))
2013  ereport(ERROR,
2014  (errcode(ERRCODE_UNDEFINED_OBJECT),
2015  errmsg("could not find array type for data type %s",
2016  format_type_be(context_actual_type))));
2017  return array_typeid;
2018  }
2019  }
2020  else if (declared_type == ANYELEMENTOID ||
2021  declared_type == ANYNONARRAYOID ||
2022  declared_type == ANYENUMOID ||
2023  declared_type == ANYRANGEOID)
2024  {
2025  if (context_declared_type == ANYARRAYOID)
2026  {
2027  /* Use the element type corresponding to actual type */
2028  Oid context_base_type = getBaseType(context_actual_type);
2029  Oid array_typelem = get_element_type(context_base_type);
2030 
2031  if (!OidIsValid(array_typelem))
2032  ereport(ERROR,
2033  (errcode(ERRCODE_DATATYPE_MISMATCH),
2034  errmsg("argument declared %s is not an array but type %s",
2035  "anyarray", format_type_be(context_base_type))));
2036  return array_typelem;
2037  }
2038  else if (context_declared_type == ANYRANGEOID)
2039  {
2040  /* Use the element type corresponding to actual type */
2041  Oid context_base_type = getBaseType(context_actual_type);
2042  Oid range_typelem = get_range_subtype(context_base_type);
2043 
2044  if (!OidIsValid(range_typelem))
2045  ereport(ERROR,
2046  (errcode(ERRCODE_DATATYPE_MISMATCH),
2047  errmsg("argument declared %s is not a range type but type %s",
2048  "anyrange", format_type_be(context_base_type))));
2049  return range_typelem;
2050  }
2051  else if (context_declared_type == ANYELEMENTOID ||
2052  context_declared_type == ANYNONARRAYOID ||
2053  context_declared_type == ANYENUMOID)
2054  {
2055  /* Use the actual type; it doesn't matter if array or not */
2056  return context_actual_type;
2057  }
2058  }
2059  else
2060  {
2061  /* declared_type isn't polymorphic, so return it as-is */
2062  return declared_type;
2063  }
2064  /* If we get here, declared_type is polymorphic and context isn't */
2065  /* NB: this is a calling-code logic error, not a user error */
2066  elog(ERROR, "could not determine polymorphic type because context isn't polymorphic");
2067  return InvalidOid; /* keep compiler quiet */
2068 }
#define ANYNONARRAYOID
Definition: pg_type.h:704
Oid get_element_type(Oid typid)
Definition: lsyscache.c:2517
Oid get_array_type(Oid typid)
Definition: lsyscache.c:2545
#define ANYELEMENTOID
Definition: pg_type.h:702
int errcode(int sqlerrcode)
Definition: elog.c:575
char * format_type_be(Oid type_oid)
Definition: format_type.c:94
unsigned int Oid
Definition: postgres_ext.h:31
#define OidIsValid(objectId)
Definition: c.h:576
#define ERROR
Definition: elog.h:43
#define ANYRANGEOID
Definition: pg_type.h:714
#define ANYENUMOID
Definition: pg_type.h:706
#define ereport(elevel, rest)
Definition: elog.h:122
#define ANYARRAYOID
Definition: pg_type.h:688
#define InvalidOid
Definition: postgres_ext.h:36
int errmsg(const char *fmt,...)
Definition: elog.c:797
#define elog
Definition: elog.h:219
Oid getBaseType(Oid typid)
Definition: lsyscache.c:2290
Oid get_range_subtype(Oid rangeOid)
Definition: lsyscache.c:3107

◆ select_common_type()

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

Definition at line 1271 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_head(), lnext, NIL, parser_errposition(), TEXTOID, and UNKNOWNOID.

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

1273 {
1274  Node *pexpr;
1275  Oid ptype;
1276  TYPCATEGORY pcategory;
1277  bool pispreferred;
1278  ListCell *lc;
1279 
1280  Assert(exprs != NIL);
1281  pexpr = (Node *) linitial(exprs);
1282  lc = lnext(list_head(exprs));
1283  ptype = exprType(pexpr);
1284 
1285  /*
1286  * If all input types are valid and exactly the same, just pick that type.
1287  * This is the only way that we will resolve the result as being a domain
1288  * type; otherwise domains are smashed to their base types for comparison.
1289  */
1290  if (ptype != UNKNOWNOID)
1291  {
1292  for_each_cell(lc, lc)
1293  {
1294  Node *nexpr = (Node *) lfirst(lc);
1295  Oid ntype = exprType(nexpr);
1296 
1297  if (ntype != ptype)
1298  break;
1299  }
1300  if (lc == NULL) /* got to the end of the list? */
1301  {
1302  if (which_expr)
1303  *which_expr = pexpr;
1304  return ptype;
1305  }
1306  }
1307 
1308  /*
1309  * Nope, so set up for the full algorithm. Note that at this point, lc
1310  * points to the first list item with type different from pexpr's; we need
1311  * not re-examine any items the previous loop advanced over.
1312  */
1313  ptype = getBaseType(ptype);
1314  get_type_category_preferred(ptype, &pcategory, &pispreferred);
1315 
1316  for_each_cell(lc, lc)
1317  {
1318  Node *nexpr = (Node *) lfirst(lc);
1319  Oid ntype = getBaseType(exprType(nexpr));
1320 
1321  /* move on to next one if no new information... */
1322  if (ntype != UNKNOWNOID && ntype != ptype)
1323  {
1324  TYPCATEGORY ncategory;
1325  bool nispreferred;
1326 
1327  get_type_category_preferred(ntype, &ncategory, &nispreferred);
1328  if (ptype == UNKNOWNOID)
1329  {
1330  /* so far, only unknowns so take anything... */
1331  pexpr = nexpr;
1332  ptype = ntype;
1333  pcategory = ncategory;
1334  pispreferred = nispreferred;
1335  }
1336  else if (ncategory != pcategory)
1337  {
1338  /*
1339  * both types in different categories? then not much hope...
1340  */
1341  if (context == NULL)
1342  return InvalidOid;
1343  ereport(ERROR,
1344  (errcode(ERRCODE_DATATYPE_MISMATCH),
1345  /*------
1346  translator: first %s is name of a SQL construct, eg CASE */
1347  errmsg("%s types %s and %s cannot be matched",
1348  context,
1349  format_type_be(ptype),
1350  format_type_be(ntype)),
1351  parser_errposition(pstate, exprLocation(nexpr))));
1352  }
1353  else if (!pispreferred &&
1354  can_coerce_type(1, &ptype, &ntype, COERCION_IMPLICIT) &&
1355  !can_coerce_type(1, &ntype, &ptype, COERCION_IMPLICIT))
1356  {
1357  /*
1358  * take new type if can coerce to it implicitly but not the
1359  * other way; but if we have a preferred type, stay on it.
1360  */
1361  pexpr = nexpr;
1362  ptype = ntype;
1363  pcategory = ncategory;
1364  pispreferred = nispreferred;
1365  }
1366  }
1367  }
1368 
1369  /*
1370  * If all the inputs were UNKNOWN type --- ie, unknown-type literals ---
1371  * then resolve as type TEXT. This situation comes up with constructs
1372  * like SELECT (CASE WHEN foo THEN 'bar' ELSE 'baz' END); SELECT 'foo'
1373  * UNION SELECT 'bar'; It might seem desirable to leave the construct's
1374  * output type as UNKNOWN, but that really doesn't work, because we'd
1375  * probably end up needing a runtime coercion from UNKNOWN to something
1376  * else, and we usually won't have it. We need to coerce the unknown
1377  * literals while they are still literals, so a decision has to be made
1378  * now.
1379  */
1380  if (ptype == UNKNOWNOID)
1381  ptype = TEXTOID;
1382 
1383  if (which_expr)
1384  *which_expr = pexpr;
1385  return ptype;
1386 }
#define NIL
Definition: pg_list.h:69
int exprLocation(const Node *expr)
Definition: nodeFuncs.c:1186
#define TEXTOID
Definition: pg_type.h:324
Definition: nodes.h:512
int errcode(int sqlerrcode)
Definition: elog.c:575
char * format_type_be(Oid type_oid)
Definition: format_type.c:94
unsigned int Oid
Definition: postgres_ext.h:31
char TYPCATEGORY
Definition: parse_coerce.h:21
#define linitial(l)
Definition: pg_list.h:111
#define ERROR
Definition: elog.h:43
static ListCell * list_head(const List *l)
Definition: pg_list.h:77
#define lnext(lc)
Definition: pg_list.h:105
#define ereport(elevel, rest)
Definition: elog.h:122
#define InvalidOid
Definition: postgres_ext.h:36
#define Assert(condition)
Definition: c.h:670
#define lfirst(lc)
Definition: pg_list.h:106
Oid exprType(const Node *expr)
Definition: nodeFuncs.c:42
int parser_errposition(ParseState *pstate, int location)
Definition: parse_node.c:111
#define for_each_cell(cell, initcell)
Definition: pg_list.h:169
#define UNKNOWNOID
Definition: pg_type.h:431
bool can_coerce_type(int nargs, Oid *input_typeids, Oid *target_typeids, CoercionContext ccontext)
Definition: parse_coerce.c:543
int errmsg(const char *fmt,...)
Definition: elog.c:797
Oid getBaseType(Oid typid)
Definition: lsyscache.c:2290
void get_type_category_preferred(Oid typid, char *typcategory, bool *typispreferred)
Definition: lsyscache.c:2469

◆ TypeCategory()

TYPCATEGORY TypeCategory ( Oid  type)

Definition at line 2077 of file parse_coerce.c.

References Assert, get_type_category_preferred(), and TYPCATEGORY_INVALID.

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

2078 {
2079  char typcategory;
2080  bool typispreferred;
2081 
2082  get_type_category_preferred(type, &typcategory, &typispreferred);
2083  Assert(typcategory != TYPCATEGORY_INVALID);
2084  return (TYPCATEGORY) typcategory;
2085 }
char TYPCATEGORY
Definition: parse_coerce.h:21
#define TYPCATEGORY_INVALID
Definition: pg_type.h:727
#define Assert(condition)
Definition: c.h:670
void get_type_category_preferred(Oid typid, char *typcategory, bool *typispreferred)
Definition: lsyscache.c:2469