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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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6
src/backend/nodes/copyfuncs.c
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@ -15,7 +15,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.211 2002/09/04 20:31:19 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.212 2002/09/18 21:35:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -850,6 +850,7 @@ _copyFunc(Func *from)
newnode->funcid = from->funcid;
newnode->funcresulttype = from->funcresulttype;
newnode->funcretset = from->funcretset;
newnode->funcformat = from->funcformat;
/* Do not copy the run-time state, if any */
newnode->func_fcache = NULL;
@ -931,6 +932,7 @@ _copyRelabelType(RelabelType *from)
Node_Copy(from, newnode, arg);
newnode->resulttype = from->resulttype;
newnode->resulttypmod = from->resulttypmod;
newnode->relabelformat = from->relabelformat;
return newnode;
}
@ -2634,7 +2636,7 @@ _copyCreateCastStmt(CreateCastStmt *from)
Node_Copy(from, newnode, sourcetype);
Node_Copy(from, newnode, targettype);
Node_Copy(from, newnode, func);
newnode->implicit = from->implicit;
newnode->context = from->context;
return newnode;
}