granicus.if.org Git - postgresql/blob - src/include/parser/parse_coerce.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * parse_coerce.h
   4  *      Routines for type coercion.
   5  *
   6  *
   7  * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
   8  * Portions Copyright (c) 1994, Regents of the University of California
   9  *
  10  * $Id: parse_coerce.h,v 1.47 2002/09/18 21:35:24 tgl Exp $
  11  *
  12  *-------------------------------------------------------------------------
  13  */
  14 #ifndef PARSE_COERCE_H
  15 #define PARSE_COERCE_H
  16
  17 #include "catalog/pg_type.h"
  18 #include "parser/parse_node.h"
  19
  20 typedef enum CATEGORY
  21 {
  22         INVALID_TYPE,
  23         UNKNOWN_TYPE,
  24         BOOLEAN_TYPE,
  25         STRING_TYPE,
  26         BITSTRING_TYPE,
  27         NUMERIC_TYPE,
  28         DATETIME_TYPE,
  29         TIMESPAN_TYPE,
  30         GEOMETRIC_TYPE,
  31         NETWORK_TYPE,
  32         USER_TYPE
  33 } CATEGORY;
  34
  35
  36 extern bool IsBinaryCoercible(Oid srctype, Oid targettype);
  37 extern bool IsPreferredType(CATEGORY category, Oid type);
  38 extern CATEGORY TypeCategory(Oid type);
  39
  40 extern Node *coerce_to_target_type(Node *expr, Oid exprtype,
  41                                                                    Oid targettype, int32 targettypmod,
  42                                                                    CoercionContext ccontext,
  43                                                                    CoercionForm cformat);
  44 extern bool can_coerce_type(int nargs, Oid *input_typeids, Oid *target_typeids,
  45                                                         CoercionContext ccontext);
  46 extern Node *coerce_type(Node *node, Oid inputTypeId, Oid targetTypeId,
  47                                                  CoercionContext ccontext, CoercionForm cformat);
  48 extern Node *coerce_type_constraints(Node *arg, Oid typeId,
  49                                                                          CoercionForm cformat);
  50
  51 extern Node *coerce_to_boolean(Node *node, const char *constructName);
  52
  53 extern Oid      select_common_type(List *typeids, const char *context);
  54 extern Node *coerce_to_common_type(Node *node, Oid targetTypeId,
  55                                           const char *context);
  56
  57 extern Oid      find_typmod_coercion_function(Oid typeId, int *nargs);
  58
  59 #endif   /* PARSE_COERCE_H */