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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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46
src/backend/utils/adt/numeric.c
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@ -5,7 +5,7 @@
*
* 1998 Jan Wieck
*
* $Header: /cvsroot/pgsql/src/backend/utils/adt/numeric.c,v 1.53 2002/09/04 20:31:28 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/numeric.c,v 1.54 2002/09/18 21:35:22 tgl Exp $
*
* ----------
*/
@ -1709,6 +1709,50 @@ numeric_float4(PG_FUNCTION_ARGS)
}
Datum
text_numeric(PG_FUNCTION_ARGS)
{
text *str = PG_GETARG_TEXT_P(0);
int len;
char *s;
Datum result;
len = (VARSIZE(str) - VARHDRSZ);
s = palloc(len + 1);
memcpy(s, VARDATA(str), len);
*(s + len) = '\0';
result = DirectFunctionCall3(numeric_in, CStringGetDatum(s),
ObjectIdGetDatum(0), Int32GetDatum(-1));
pfree(s);
return result;
}
Datum
numeric_text(PG_FUNCTION_ARGS)
{
/* val is numeric, but easier to leave it as Datum */
Datum val = PG_GETARG_DATUM(0);
char *s;
int len;
text *result;
s = DatumGetCString(DirectFunctionCall1(numeric_out, val));
len = strlen(s);
result = (text *) palloc(VARHDRSZ + len);
VARATT_SIZEP(result) = len + VARHDRSZ;
memcpy(VARDATA(result), s, len);
pfree(s);
PG_RETURN_TEXT_P(result);
}
/* ----------------------------------------------------------------------
*
* Aggregate functions