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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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21
src/backend/nodes/equalfuncs.c
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@@ -20,7 +20,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.158 2002/09/02 02:13:01 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.159 2002/09/18 21:35:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -217,6 +217,15 @@ _equalFunc(Func *a, Func *b)
return false;
if (a->funcretset != b->funcretset)
return false;
/*
* Special-case COERCE_DONTCARE, so that pathkeys can build coercion
* nodes that are equal() to both explicit and implicit coercions.
*/
if (a->funcformat != b->funcformat &&
a->funcformat != COERCE_DONTCARE &&
b->funcformat != COERCE_DONTCARE)
return false;
/* Note we do not look at func_fcache; see notes for _equalOper */
return true;
@@ -302,6 +311,14 @@ _equalRelabelType(RelabelType *a, RelabelType *b)
return false;
if (a->resulttypmod != b->resulttypmod)
return false;
/*
* Special-case COERCE_DONTCARE, so that pathkeys can build coercion
* nodes that are equal() to both explicit and implicit coercions.
*/
if (a->relabelformat != b->relabelformat &&
a->relabelformat != COERCE_DONTCARE &&
b->relabelformat != COERCE_DONTCARE)
return false;
return true;
}
@@ -1475,7 +1492,7 @@ _equalCreateCastStmt(CreateCastStmt *a, CreateCastStmt *b)
return false;
if (!equal(a->func, b->func))
return false;
if (a->implicit != b->implicit)
if (a->context != b->context)
return false;
return true;