1 /*-------------------------------------------------------------------------
5 * Routines for type coercion.
7 * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
8 * Portions Copyright (c) 1994, Regents of the University of California
10 * $Id: parse_coerce.h,v 1.34 2001/10/03 19:18:42 tgl Exp $
12 *-------------------------------------------------------------------------
14 #ifndef PARSE_COERCE_H
15 #define PARSE_COERCE_H
17 #include "catalog/pg_type.h"
18 #include "parser/parse_node.h"
37 /* IS_BINARY_COMPATIBLE()
38 * Check for types with the same underlying binary representation.
39 * This allows us to cheat and directly exchange values without
40 * going through the trouble of calling a conversion function.
42 * Remove equivalencing of FLOAT8 and TIMESTAMP. They really are not
43 * close enough in behavior, with the TIMESTAMP reserved values
44 * and special formatting. - thomas 1999-01-24
46 #define IS_BINARY_COMPATIBLE(a,b) \
47 (((a) == BPCHAROID && (b) == TEXTOID) \
48 || ((a) == BPCHAROID && (b) == VARCHAROID) \
49 || ((a) == VARCHAROID && (b) == TEXTOID) \
50 || ((a) == VARCHAROID && (b) == BPCHAROID) \
51 || ((a) == TEXTOID && (b) == BPCHAROID) \
52 || ((a) == TEXTOID && (b) == VARCHAROID) \
53 || ((a) == OIDOID && (b) == INT4OID) \
54 || ((a) == OIDOID && (b) == REGPROCOID) \
55 || ((a) == INT4OID && (b) == OIDOID) \
56 || ((a) == INT4OID && (b) == REGPROCOID) \
57 || ((a) == REGPROCOID && (b) == OIDOID) \
58 || ((a) == REGPROCOID && (b) == INT4OID) \
59 || ((a) == ABSTIMEOID && (b) == INT4OID) \
60 || ((a) == INT4OID && (b) == ABSTIMEOID) \
61 || ((a) == RELTIMEOID && (b) == INT4OID) \
62 || ((a) == INT4OID && (b) == RELTIMEOID) \
63 || ((a) == INETOID && (b) == CIDROID) \
64 || ((a) == CIDROID && (b) == INETOID) \
65 || ((a) == BITOID && (b) == VARBITOID) \
66 || ((a) == VARBITOID && (b) == BITOID))
69 extern bool IsPreferredType(CATEGORY category, Oid type);
70 extern CATEGORY TypeCategory(Oid type);
72 extern bool can_coerce_type(int nargs, Oid *input_typeids, Oid *func_typeids);
73 extern Node *coerce_type(ParseState *pstate, Node *node, Oid inputTypeId,
74 Oid targetTypeId, int32 atttypmod);
75 extern Node *coerce_type_typmod(ParseState *pstate, Node *node,
76 Oid targetTypeId, int32 atttypmod);
78 extern bool coerce_to_boolean(ParseState *pstate, Node **pnode);
80 extern Oid select_common_type(List *typeids, const char *context);
81 extern Node *coerce_to_common_type(ParseState *pstate, Node *node,
85 #endif /* PARSE_COERCE_H */