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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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47
src/backend/utils/cache/lsyscache.c vendored
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/cache/lsyscache.c,v 1.83 2002/09/04 20:31:30 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/cache/lsyscache.c,v 1.84 2002/09/18 21:35:23 tgl Exp $
*
* NOTES
* Eventually, the index information should go through here, too.
@ -1073,51 +1073,6 @@ getBaseType(Oid typid)
return typid;
}
/*
* getBaseTypeMod
* If the given type is a domain, return the typmod it applies to
* its base type; otherwise return the specified original typmod.
*/
int32
getBaseTypeMod(Oid typid, int32 typmod)
{
/*
* We loop to find the bottom base type in a stack of domains.
*/
for (;;)
{
HeapTuple tup;
Form_pg_type typTup;
tup = SearchSysCache(TYPEOID,
ObjectIdGetDatum(typid),
0, 0, 0);
if (!HeapTupleIsValid(tup))
elog(ERROR, "getBaseTypeMod: failed to lookup type %u", typid);
typTup = (Form_pg_type) GETSTRUCT(tup);
if (typTup->typtype != 'd')
{
/* Not a domain, so done */
ReleaseSysCache(tup);
break;
}
/*
* The typmod applied to a domain should always be -1.
*
* We substitute the domain's typmod as we switch attention to the
* base type.
*/
Assert(typmod < 0);
typid = typTup->typbasetype;
typmod = typTup->typtypmod;
ReleaseSysCache(tup);
}
return typmod;
}
/*
* get_typavgwidth
*