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86 lines
2.7 KiB
C
86 lines
2.7 KiB
C
/*-------------------------------------------------------------------------
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*
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* parse_coerce.h
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*
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* Routines for type coercion.
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*
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* Portions Copyright (c) 1996-2001, 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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* $Id: parse_coerce.h,v 1.37 2001/11/05 17:46:34 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 "catalog/pg_type.h"
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#include "parser/parse_node.h"
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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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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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MIXED_TYPE
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} CATEGORY;
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/* IS_BINARY_COMPATIBLE()
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* Check for types with the same underlying binary representation.
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* This allows us to cheat and directly exchange values without
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* going through the trouble of calling a conversion function.
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*
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* Remove equivalencing of FLOAT8 and TIMESTAMP. They really are not
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* close enough in behavior, with the TIMESTAMP reserved values
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* and special formatting. - thomas 1999-01-24
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*/
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#define IS_BINARY_COMPATIBLE(a,b) \
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(((a) == BPCHAROID && (b) == TEXTOID) \
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|| ((a) == BPCHAROID && (b) == VARCHAROID) \
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|| ((a) == VARCHAROID && (b) == TEXTOID) \
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|| ((a) == VARCHAROID && (b) == BPCHAROID) \
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|| ((a) == TEXTOID && (b) == BPCHAROID) \
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|| ((a) == TEXTOID && (b) == VARCHAROID) \
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|| ((a) == OIDOID && (b) == INT4OID) \
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|| ((a) == OIDOID && (b) == REGPROCOID) \
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|| ((a) == INT4OID && (b) == OIDOID) \
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|| ((a) == INT4OID && (b) == REGPROCOID) \
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|| ((a) == REGPROCOID && (b) == OIDOID) \
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|| ((a) == REGPROCOID && (b) == INT4OID) \
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|| ((a) == ABSTIMEOID && (b) == INT4OID) \
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|| ((a) == INT4OID && (b) == ABSTIMEOID) \
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|| ((a) == RELTIMEOID && (b) == INT4OID) \
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|| ((a) == INT4OID && (b) == RELTIMEOID) \
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|| ((a) == INETOID && (b) == CIDROID) \
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|| ((a) == CIDROID && (b) == INETOID) \
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|| ((a) == BITOID && (b) == VARBITOID) \
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|| ((a) == VARBITOID && (b) == BITOID))
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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 bool can_coerce_type(int nargs, Oid *input_typeids, Oid *func_typeids);
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extern Node *coerce_type(ParseState *pstate, Node *node, Oid inputTypeId,
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Oid targetTypeId, int32 atttypmod);
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extern Node *coerce_type_typmod(ParseState *pstate, Node *node,
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Oid targetTypeId, int32 atttypmod);
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extern bool coerce_to_boolean(ParseState *pstate, Node **pnode);
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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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#endif /* PARSE_COERCE_H */
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