mirror of
https://github.com/postgres/postgres.git
synced 2025-06-16 06:01:02 +03:00
Extend pg_cast castimplicit column to a three-way value; this allows us
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:
@ -8,7 +8,7 @@
|
||||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $Header: /cvsroot/pgsql/src/backend/parser/parse_oper.c,v 1.59 2002/09/04 20:31:24 momjian Exp $
|
||||
* $Header: /cvsroot/pgsql/src/backend/parser/parse_oper.c,v 1.60 2002/09/18 21:35:22 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -273,7 +273,7 @@ oper_select_candidate(int nargs,
|
||||
current_candidate = current_candidate->next)
|
||||
{
|
||||
if (can_coerce_type(nargs, input_typeids, current_candidate->args,
|
||||
false))
|
||||
COERCION_IMPLICIT))
|
||||
{
|
||||
if (last_candidate == NULL)
|
||||
{
|
||||
@ -362,7 +362,7 @@ oper_select_candidate(int nargs,
|
||||
{
|
||||
if (input_typeids[i] != UNKNOWNOID)
|
||||
{
|
||||
if (IsBinaryCompatible(current_typeids[i], input_typeids[i]))
|
||||
if (IsBinaryCoercible(input_typeids[i], current_typeids[i]))
|
||||
nmatch++;
|
||||
}
|
||||
}
|
||||
@ -696,8 +696,8 @@ compatible_oper(List *op, Oid arg1, Oid arg2, bool noError)
|
||||
|
||||
/* but is it good enough? */
|
||||
opform = (Form_pg_operator) GETSTRUCT(optup);
|
||||
if (IsBinaryCompatible(opform->oprleft, arg1) &&
|
||||
IsBinaryCompatible(opform->oprright, arg2))
|
||||
if (IsBinaryCoercible(arg1, opform->oprleft) &&
|
||||
IsBinaryCoercible(arg2, opform->oprright))
|
||||
return optup;
|
||||
|
||||
/* nope... */
|
||||
|
Reference in New Issue
Block a user