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97 lines
3.0 KiB
C
97 lines
3.0 KiB
C
/*-------------------------------------------------------------------------
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*
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* parse_coerce.h
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* Routines for type coercion.
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*
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*
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* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/parser/parse_coerce.h,v 1.72 2007/11/15 21:14:44 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PARSE_COERCE_H
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#define PARSE_COERCE_H
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#include "parser/parse_node.h"
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/* Type categories (kluge ... ought to be extensible) */
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typedef enum CATEGORY
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{
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INVALID_TYPE,
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UNKNOWN_TYPE,
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GENERIC_TYPE,
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BOOLEAN_TYPE,
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STRING_TYPE,
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BITSTRING_TYPE,
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NUMERIC_TYPE,
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DATETIME_TYPE,
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TIMESPAN_TYPE,
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GEOMETRIC_TYPE,
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NETWORK_TYPE,
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USER_TYPE
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} CATEGORY;
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/* Result codes for find_coercion_pathway */
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typedef enum CoercionPathType
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{
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COERCION_PATH_NONE, /* failed to find any coercion pathway */
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COERCION_PATH_FUNC, /* apply the specified coercion function */
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COERCION_PATH_RELABELTYPE, /* binary-compatible cast, no function */
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COERCION_PATH_ARRAYCOERCE, /* need an ArrayCoerceExpr node */
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COERCION_PATH_COERCEVIAIO /* need a CoerceViaIO node */
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} CoercionPathType;
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extern bool IsBinaryCoercible(Oid srctype, Oid targettype);
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extern bool IsPreferredType(CATEGORY category, Oid type);
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extern CATEGORY TypeCategory(Oid type);
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extern Node *coerce_to_target_type(ParseState *pstate,
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Node *expr, Oid exprtype,
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Oid targettype, int32 targettypmod,
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CoercionContext ccontext,
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CoercionForm cformat);
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extern bool can_coerce_type(int nargs, Oid *input_typeids, Oid *target_typeids,
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CoercionContext ccontext);
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extern Node *coerce_type(ParseState *pstate, Node *node,
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Oid inputTypeId, Oid targetTypeId, int32 targetTypeMod,
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CoercionContext ccontext, CoercionForm cformat);
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extern Node *coerce_to_domain(Node *arg, Oid baseTypeId, int32 baseTypeMod,
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Oid typeId,
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CoercionForm cformat, bool hideInputCoercion,
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bool lengthCoercionDone);
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extern Node *coerce_to_boolean(ParseState *pstate, Node *node,
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const char *constructName);
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extern Node *coerce_to_specific_type(ParseState *pstate, Node *node,
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Oid targetTypeId,
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const char *constructName);
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extern Oid select_common_type(List *typeids, const char *context);
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extern Node *coerce_to_common_type(ParseState *pstate, Node *node,
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Oid targetTypeId,
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const char *context);
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extern bool check_generic_type_consistency(Oid *actual_arg_types,
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Oid *declared_arg_types,
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int nargs);
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extern Oid enforce_generic_type_consistency(Oid *actual_arg_types,
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Oid *declared_arg_types,
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int nargs,
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Oid rettype);
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extern Oid resolve_generic_type(Oid declared_type,
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Oid context_actual_type,
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Oid context_declared_type);
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extern CoercionPathType find_coercion_pathway(Oid targetTypeId,
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Oid sourceTypeId,
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CoercionContext ccontext,
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Oid *funcid);
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extern CoercionPathType find_typmod_coercion_function(Oid typeId,
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Oid *funcid);
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#endif /* PARSE_COERCE_H */
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