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/*-------------------------------------------------------------------------
*
* parse_coerce.h
* Routines for type coercion.
*
*
* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/parser/parse_coerce.h
*
*-------------------------------------------------------------------------
*/
#ifndef PARSE_COERCE_H
#define PARSE_COERCE_H
#include "parser/parse_node.h"
/* Type categories (see TYPCATEGORY_xxx symbols in catalog/pg_type.h) */
typedef char TYPCATEGORY;
/* Result codes for find_coercion_pathway */
typedef enum CoercionPathType
{
COERCION_PATH_NONE, /* failed to find any coercion pathway */
COERCION_PATH_FUNC, /* apply the specified coercion function */
COERCION_PATH_RELABELTYPE, /* binary-compatible cast, no function */
COERCION_PATH_ARRAYCOERCE, /* need an ArrayCoerceExpr node */
COERCION_PATH_COERCEVIAIO /* need a CoerceViaIO node */
} CoercionPathType;
extern bool IsBinaryCoercible(Oid srctype, Oid targettype);
extern bool IsPreferredType(TYPCATEGORY category, Oid type);
extern TYPCATEGORY TypeCategory(Oid type);
extern Node *coerce_to_target_type(ParseState *pstate,
Node *expr, Oid exprtype,
Oid targettype, int32 targettypmod,
CoercionContext ccontext,
CoercionForm cformat,
int location);
extern bool can_coerce_type(int nargs, Oid *input_typeids, Oid *target_typeids,
CoercionContext ccontext);
extern Node *coerce_type(ParseState *pstate, Node *node,
Oid inputTypeId, Oid targetTypeId, int32 targetTypeMod,
CoercionContext ccontext, CoercionForm cformat, int location);
extern Node *coerce_to_domain(Node *arg, Oid baseTypeId, int32 baseTypeMod,
Oid typeId,
CoercionForm cformat, int location,
bool hideInputCoercion,
bool lengthCoercionDone);
extern Node *coerce_to_boolean(ParseState *pstate, Node *node,
const char *constructName);
extern Node *coerce_to_specific_type(ParseState *pstate, Node *node,
Oid targetTypeId,
const char *constructName);
extern int parser_coercion_errposition(ParseState *pstate,
int coerce_location,
Node *input_expr);
extern Oid select_common_type(ParseState *pstate, List *exprs,
const char *context, Node **which_expr);
extern Node *coerce_to_common_type(ParseState *pstate, Node *node,
Oid targetTypeId,
const char *context);
extern bool check_generic_type_consistency(Oid *actual_arg_types,
Oid *declared_arg_types,
int nargs);
extern Oid enforce_generic_type_consistency(Oid *actual_arg_types,
Oid *declared_arg_types,
int nargs,
Oid rettype,
bool allow_poly);
extern Oid resolve_generic_type(Oid declared_type,
Oid context_actual_type,
Oid context_declared_type);
extern CoercionPathType find_coercion_pathway(Oid targetTypeId,
Oid sourceTypeId,
CoercionContext ccontext,
Oid *funcid);
extern CoercionPathType find_typmod_coercion_function(Oid typeId,
Oid *funcid);
#endif /* PARSE_COERCE_H */