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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:
Tom Lane
2002-09-18 21:35:25 +00:00
parent cc70ba2e4d
commit b26dfb9522
70 changed files with 1642 additions and 1528 deletions

View File

@ -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... */