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Extend pg_cast castimplicit column to a three-way value; this allows us

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to be flexible about assignment casts without introducing ambiguity in
operator/function resolution.  Introduce a well-defined promotion hierarchy
for numeric datatypes (int2->int4->int8->numeric->float4->float8).
Change make_const to initially label numeric literals as int4, int8, or
numeric (never float8 anymore).
Explicitly mark Func and RelabelType nodes to indicate whether they came
from a function call, explicit cast, or implicit cast; use this to do
reverse-listing more accurately and without so many heuristics.
Explicit casts to char, varchar, bit, varbit will truncate or pad without
raising an error (the pre-7.2 behavior), while assigning to a column without
any explicit cast will still raise an error for wrong-length data like 7.3.
This more nearly follows the SQL spec than 7.2 behavior (we should be
reporting a 'completion condition' in the explicit-cast cases, but we have
no mechanism for that, so just do silent truncation).
Fix some problems with enforcement of typmod for array elements;
it didn't work at all in 'UPDATE ... SET array[n] = foo', for example.
Provide a generalized array_length_coerce() function to replace the
specialized per-array-type functions that used to be needed (and were
missing for NUMERIC as well as all the datetime types).
Add missing conversions int8<->float4, text<->numeric, oid<->int8.
initdb forced.
This commit is contained in:
Tom Lane
2002-09-18 21:35:25 +00:00
parent cc70ba2e4d
commit b26dfb9522
70 changed files with 1642 additions and 1528 deletions
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32
src/include/parser/parse_coerce.h
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@@ -1,13 +1,13 @@
/*-------------------------------------------------------------------------
*
* parse_coerce.h
*
* Routines for type coercion.
*
*
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: parse_coerce.h,v 1.46 2002/09/04 20:31:45 momjian Exp $
* $Id: parse_coerce.h,v 1.47 2002/09/18 21:35:24 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -29,29 +29,31 @@ typedef enum CATEGORY
TIMESPAN_TYPE,
GEOMETRIC_TYPE,
NETWORK_TYPE,
USER_TYPE,
MIXED_TYPE
USER_TYPE
} CATEGORY;
extern bool IsBinaryCompatible(Oid type1, Oid type2);
extern bool IsBinaryCoercible(Oid srctype, Oid targettype);
extern bool IsPreferredType(CATEGORY category, Oid type);
extern CATEGORY TypeCategory(Oid type);
extern bool can_coerce_type(int nargs, Oid *input_typeids, Oid *func_typeids,
bool isExplicit);
extern Node *coerce_type(ParseState *pstate, Node *node, Oid inputTypeId,
Oid targetTypeId, int32 atttypmod, bool isExplicit);
extern Node *coerce_type_typmod(ParseState *pstate, Node *node,
Oid targetTypeId, int32 atttypmod);
extern Node *coerce_type_constraints(ParseState *pstate, Node *arg,
Oid typeId, bool applyTypmod);
extern Node *coerce_to_target_type(Node *expr, Oid exprtype,
Oid targettype, int32 targettypmod,
CoercionContext ccontext,
CoercionForm cformat);
extern bool can_coerce_type(int nargs, Oid *input_typeids, Oid *target_typeids,
CoercionContext ccontext);
extern Node *coerce_type(Node *node, Oid inputTypeId, Oid targetTypeId,
CoercionContext ccontext, CoercionForm cformat);
extern Node *coerce_type_constraints(Node *arg, Oid typeId,
CoercionForm cformat);
extern Node *coerce_to_boolean(Node *node, const char *constructName);
extern Oid select_common_type(List *typeids, const char *context);
extern Node *coerce_to_common_type(ParseState *pstate, Node *node,
Oid targetTypeId,
extern Node *coerce_to_common_type(Node *node, Oid targetTypeId,
const char *context);
extern Oid find_typmod_coercion_function(Oid typeId, int *nargs);
#endif /* PARSE_COERCE_H */