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00001 /*------------------------------------------------------------------------- 00002 * 00003 * parse_coerce.h 00004 * Routines for type coercion. 00005 * 00006 * 00007 * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group 00008 * Portions Copyright (c) 1994, Regents of the University of California 00009 * 00010 * src/include/parser/parse_coerce.h 00011 * 00012 *------------------------------------------------------------------------- 00013 */ 00014 #ifndef PARSE_COERCE_H 00015 #define PARSE_COERCE_H 00016 00017 #include "parser/parse_node.h" 00018 00019 00020 /* Type categories (see TYPCATEGORY_xxx symbols in catalog/pg_type.h) */ 00021 typedef char TYPCATEGORY; 00022 00023 /* Result codes for find_coercion_pathway */ 00024 typedef enum CoercionPathType 00025 { 00026 COERCION_PATH_NONE, /* failed to find any coercion pathway */ 00027 COERCION_PATH_FUNC, /* apply the specified coercion function */ 00028 COERCION_PATH_RELABELTYPE, /* binary-compatible cast, no function */ 00029 COERCION_PATH_ARRAYCOERCE, /* need an ArrayCoerceExpr node */ 00030 COERCION_PATH_COERCEVIAIO /* need a CoerceViaIO node */ 00031 } CoercionPathType; 00032 00033 00034 extern bool IsBinaryCoercible(Oid srctype, Oid targettype); 00035 extern bool IsPreferredType(TYPCATEGORY category, Oid type); 00036 extern TYPCATEGORY TypeCategory(Oid type); 00037 00038 extern Node *coerce_to_target_type(ParseState *pstate, 00039 Node *expr, Oid exprtype, 00040 Oid targettype, int32 targettypmod, 00041 CoercionContext ccontext, 00042 CoercionForm cformat, 00043 int location); 00044 extern bool can_coerce_type(int nargs, Oid *input_typeids, Oid *target_typeids, 00045 CoercionContext ccontext); 00046 extern Node *coerce_type(ParseState *pstate, Node *node, 00047 Oid inputTypeId, Oid targetTypeId, int32 targetTypeMod, 00048 CoercionContext ccontext, CoercionForm cformat, int location); 00049 extern Node *coerce_to_domain(Node *arg, Oid baseTypeId, int32 baseTypeMod, 00050 Oid typeId, 00051 CoercionForm cformat, int location, 00052 bool hideInputCoercion, 00053 bool lengthCoercionDone); 00054 00055 extern Node *coerce_to_boolean(ParseState *pstate, Node *node, 00056 const char *constructName); 00057 extern Node *coerce_to_specific_type(ParseState *pstate, Node *node, 00058 Oid targetTypeId, 00059 const char *constructName); 00060 00061 extern int parser_coercion_errposition(ParseState *pstate, 00062 int coerce_location, 00063 Node *input_expr); 00064 00065 extern Oid select_common_type(ParseState *pstate, List *exprs, 00066 const char *context, Node **which_expr); 00067 extern Node *coerce_to_common_type(ParseState *pstate, Node *node, 00068 Oid targetTypeId, 00069 const char *context); 00070 00071 extern bool check_generic_type_consistency(Oid *actual_arg_types, 00072 Oid *declared_arg_types, 00073 int nargs); 00074 extern Oid enforce_generic_type_consistency(Oid *actual_arg_types, 00075 Oid *declared_arg_types, 00076 int nargs, 00077 Oid rettype, 00078 bool allow_poly); 00079 extern Oid resolve_generic_type(Oid declared_type, 00080 Oid context_actual_type, 00081 Oid context_declared_type); 00082 00083 extern CoercionPathType find_coercion_pathway(Oid targetTypeId, 00084 Oid sourceTypeId, 00085 CoercionContext ccontext, 00086 Oid *funcid); 00087 extern CoercionPathType find_typmod_coercion_function(Oid typeId, 00088 Oid *funcid); 00089 00090 #endif /* PARSE_COERCE_H */
1.7.1