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.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/include/utils/array.h b/src/include/utils/array.h
index 5c1276467c0..639d9dc3153 100644
--- a/src/include/utils/array.h
+++ b/src/include/utils/array.h
@@ -10,7 +10,7 @@
  * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: array.h,v 1.34 2002/09/04 20:31:45 momjian Exp $
+ * $Id: array.h,v 1.35 2002/09/18 21:35:24 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -82,6 +82,7 @@ typedef struct
  */
 extern Datum array_in(PG_FUNCTION_ARGS);
 extern Datum array_out(PG_FUNCTION_ARGS);
+extern Datum array_length_coerce(PG_FUNCTION_ARGS);
 extern Datum array_eq(PG_FUNCTION_ARGS);
 extern Datum array_dims(PG_FUNCTION_ARGS);