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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/include/utils/builtins.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: builtins.h,v 1.199 2002/09/04 20:31:45 momjian Exp $
* $Id: builtins.h,v 1.200 2002/09/18 21:35:24 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -422,7 +422,6 @@ extern Datum currtid_byrelname(PG_FUNCTION_ARGS);
extern Datum bpcharin(PG_FUNCTION_ARGS);
extern Datum bpcharout(PG_FUNCTION_ARGS);
extern Datum bpchar(PG_FUNCTION_ARGS);
extern Datum _bpchar(PG_FUNCTION_ARGS);
extern Datum char_bpchar(PG_FUNCTION_ARGS);
extern Datum name_bpchar(PG_FUNCTION_ARGS);
extern Datum bpchar_name(PG_FUNCTION_ARGS);
@ -440,7 +439,6 @@ extern Datum hashbpchar(PG_FUNCTION_ARGS);
extern Datum varcharin(PG_FUNCTION_ARGS);
extern Datum varcharout(PG_FUNCTION_ARGS);
extern Datum varchar(PG_FUNCTION_ARGS);
extern Datum _varchar(PG_FUNCTION_ARGS);
extern Datum varchareq(PG_FUNCTION_ARGS);
extern Datum varcharne(PG_FUNCTION_ARGS);
extern Datum varcharlt(PG_FUNCTION_ARGS);
@ -633,6 +631,8 @@ extern Datum numeric_float8(PG_FUNCTION_ARGS);
extern Datum numeric_float8_no_overflow(PG_FUNCTION_ARGS);
extern Datum float4_numeric(PG_FUNCTION_ARGS);
extern Datum numeric_float4(PG_FUNCTION_ARGS);
extern Datum text_numeric(PG_FUNCTION_ARGS);
extern Datum numeric_text(PG_FUNCTION_ARGS);
extern Datum numeric_accum(PG_FUNCTION_ARGS);
extern Datum int2_accum(PG_FUNCTION_ARGS);
extern Datum int4_accum(PG_FUNCTION_ARGS);