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Downgrade implicit casts to text to be assignment-only, except for the ones
from the other string-category types; this eliminates a lot of surprising interpretations that the parser could formerly make when there was no directly applicable operator. Create a general mechanism that supports casts to and from the standard string types (text,varchar,bpchar) for *every* datatype, by invoking the datatype's I/O functions. These new casts are assignment-only in the to-string direction, explicit-only in the other, and therefore should create no surprising behavior. Remove a bunch of thereby-obsoleted datatype-specific casting functions. The "general mechanism" is a new expression node type CoerceViaIO that can actually convert between *any* two datatypes if their external text representations are compatible. This is more general than needed for the immediate feature, but might be useful in plpgsql or other places in future. This commit does nothing about the issue that applying the concatenation operator || to non-text types will now fail, often with strange error messages due to misinterpreting the operator as array concatenation. Since it often (not always) worked before, we should either make it succeed or at least give a more user-friendly error; but details are still under debate. Peter Eisentraut and Tom Lane
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‎contrib/cube/README.cube

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@@ -236,10 +236,6 @@ cube_distance(cube, cube) returns double
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cube_distance returns the distance between two cubes. If both cubes are
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points, this is the normal distance function.
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239-
cube(text) returns cube
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cube takes text input and returns a cube. This is useful for making cubes
241-
from computed strings.
242-
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cube(float8) returns cube
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This makes a one dimensional cube with both coordinates the same.
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If the type of the argument is a numeric type other than float8 an

‎contrib/cube/cube.c

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@@ -1,5 +1,5 @@
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/******************************************************************************
2-
$PostgreSQL: pgsql/contrib/cube/cube.c,v 1.32 2007/03/07 21:21:11 teodor Exp $
2+
$PostgreSQL: pgsql/contrib/cube/cube.c,v 1.33 2007/06/05 21:31:03 tgl Exp $
33
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This file contains routines that can be bound to a Postgres backend and
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called by the backend in the process of processing queries. The calling
@@ -173,18 +173,6 @@ cube_in(PG_FUNCTION_ARGS)
173173
PG_RETURN_NDBOX(result);
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}
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176-
/* Allow conversion from text to cube to allow input of computed strings */
177-
/* There may be issues with toasted data here. I don't know enough to be sure.*/
178-
Datum
179-
cube(PG_FUNCTION_ARGS)
180-
{
181-
char *cstring;
182-
183-
cstring = DatumGetCString(DirectFunctionCall1(textout, PointerGetDatum(PG_GETARG_TEXT_P(0))));
184-
185-
PG_RETURN_DATUM(DirectFunctionCall1(cube_in, PointerGetDatum(cstring)));
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}
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/*
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** Allows the construction of a cube from 2 float[]'s

‎contrib/cube/cube.sql.in

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@@ -31,16 +31,6 @@ CREATE TYPE cube (
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COMMENT ON TYPE cube IS 'multi-dimensional cube ''(FLOAT-1, FLOAT-2, ..., FLOAT-N), (FLOAT-1, FLOAT-2, ..., FLOAT-N)''';
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34-
-- Convert from text to cube
35-
36-
CREATE OR REPLACE FUNCTION cube(text) RETURNS cube
37-
AS 'MODULE_PATHNAME'
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LANGUAGE C IMMUTABLE STRICT;
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40-
COMMENT ON FUNCTION cube(text) IS 'convert text to cube';
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CREATE CAST (text AS cube) WITH FUNCTION cube(text) AS ASSIGNMENT;
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4434
--
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-- External C-functions for R-tree methods
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--

‎contrib/cube/expected/cube.out

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@@ -826,7 +826,7 @@ SELECT cube_distance('(0)'::cube,'(.3,.4)'::cube);
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-- Test of cube function (text to cube)
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--
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SELECT cube('('||1||','||1.2||')');
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SELECT cube('(1,1.2)'::text);
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cube
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----------
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(1, 1.2)

‎contrib/cube/expected/cube_1.out

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@@ -826,7 +826,7 @@ SELECT cube_distance('(0)'::cube,'(.3,.4)'::cube);
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-- Test of cube function (text to cube)
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--
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SELECT cube('('||1||','||1.2||')');
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SELECT cube('(1,1.2)'::text);
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cube
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----------
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(1, 1.2)

‎contrib/cube/expected/cube_2.out

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@@ -826,7 +826,7 @@ SELECT cube_distance('(0)'::cube,'(.3,.4)'::cube);
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-- Test of cube function (text to cube)
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--
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SELECT cube('('||1||','||1.2||')');
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SELECT cube('(1,1.2)'::text);
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cube
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----------
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(1, 1.2)

‎contrib/cube/sql/cube.sql

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Original file line numberDiff line numberDiff line change
@@ -223,7 +223,7 @@ SELECT cube_distance('(0)'::cube,'(.3,.4)'::cube);
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-- Test of cube function (text to cube)
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--
226-
SELECT cube('('||1||','||1.2||')');
226+
SELECT cube('(1,1.2)'::text);
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SELECT cube(NULL);
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-- Test of cube_dim function (dimensions stored in cube)

‎contrib/cube/uninstall_cube.sql

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@@ -92,8 +92,4 @@ DROP FUNCTION cube_ne(cube, cube);
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DROP FUNCTION cube_eq(cube, cube);
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DROP CAST (text AS cube);
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DROP FUNCTION cube(text);
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DROP TYPE cube CASCADE;

‎contrib/isn/isn.c

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@@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/contrib/isn/isn.c,v 1.5 2007/01/05 22:19:18 momjian Exp $
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* $PostgreSQL: pgsql/contrib/isn/isn.c,v 1.6 2007/06/05 21:31:03 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
@@ -39,10 +39,6 @@ static const char *isn_names[] = {"EAN13/UPC/ISxN", "EAN13/UPC/ISxN", "EAN13", "
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static bool g_weak = false;
4040
static bool g_initialized = false;
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/* Macros for converting TEXT to and from c-string */
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#define GET_TEXT(cstrp) DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(cstrp)))
44-
#define GET_STR(textp) DatumGetCString(DirectFunctionCall1(textout, PointerGetDatum(textp)))
45-
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4743
/***********************************************************************
4844
**
@@ -1042,30 +1038,6 @@ upc_in(PG_FUNCTION_ARGS)
10421038

10431039
/* casting functions
10441040
*/
1045-
PG_FUNCTION_INFO_V1(ean13_cast_to_text);
1046-
Datum
1047-
ean13_cast_to_text(PG_FUNCTION_ARGS)
1048-
{
1049-
ean13 val = PG_GETARG_EAN13(0);
1050-
char buf[MAXEAN13LEN + 1];
1051-
1052-
(void) ean2string(val, false, buf, false);
1053-
1054-
PG_RETURN_TEXT_P(GET_TEXT(buf));
1055-
}
1056-
1057-
PG_FUNCTION_INFO_V1(isn_cast_to_text);
1058-
Datum
1059-
isn_cast_to_text(PG_FUNCTION_ARGS)
1060-
{
1061-
ean13 val = PG_GETARG_EAN13(0);
1062-
char buf[MAXEAN13LEN + 1];
1063-
1064-
(void) ean2string(val, false, buf, true);
1065-
1066-
PG_RETURN_TEXT_P(GET_TEXT(buf));
1067-
}
1068-
10691041
PG_FUNCTION_INFO_V1(isbn_cast_from_ean13);
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Datum
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isbn_cast_from_ean13(PG_FUNCTION_ARGS)
@@ -1115,61 +1087,6 @@ upc_cast_from_ean13(PG_FUNCTION_ARGS)
11151087
}
11161088

11171089

1118-
PG_FUNCTION_INFO_V1(ean13_cast_from_text);
1119-
Datum
1120-
ean13_cast_from_text(PG_FUNCTION_ARGS)
1121-
{
1122-
const char *str = GET_STR(PG_GETARG_TEXT_P(0));
1123-
ean13 result;
1124-
1125-
(void) string2ean(str, false, &result, EAN13);
1126-
PG_RETURN_EAN13(result);
1127-
}
1128-
1129-
PG_FUNCTION_INFO_V1(isbn_cast_from_text);
1130-
Datum
1131-
isbn_cast_from_text(PG_FUNCTION_ARGS)
1132-
{
1133-
const char *str = GET_STR(PG_GETARG_TEXT_P(0));
1134-
ean13 result;
1135-
1136-
(void) string2ean(str, false, &result, ISBN);
1137-
PG_RETURN_EAN13(result);
1138-
}
1139-
1140-
PG_FUNCTION_INFO_V1(ismn_cast_from_text);
1141-
Datum
1142-
ismn_cast_from_text(PG_FUNCTION_ARGS)
1143-
{
1144-
const char *str = GET_STR(PG_GETARG_TEXT_P(0));
1145-
ean13 result;
1146-
1147-
(void) string2ean(str, false, &result, ISMN);
1148-
PG_RETURN_EAN13(result);
1149-
}
1150-
1151-
PG_FUNCTION_INFO_V1(issn_cast_from_text);
1152-
Datum
1153-
issn_cast_from_text(PG_FUNCTION_ARGS)
1154-
{
1155-
const char *str = GET_STR(PG_GETARG_TEXT_P(0));
1156-
ean13 result;
1157-
1158-
(void) string2ean(str, false, &result, ISSN);
1159-
PG_RETURN_EAN13(result);
1160-
}
1161-
1162-
PG_FUNCTION_INFO_V1(upc_cast_from_text);
1163-
Datum
1164-
upc_cast_from_text(PG_FUNCTION_ARGS)
1165-
{
1166-
const char *str = GET_STR(PG_GETARG_TEXT_P(0));
1167-
ean13 result;
1168-
1169-
(void) string2ean(str, false, &result, UPC);
1170-
PG_RETURN_EAN13(result);
1171-
}
1172-
11731090
/* is_valid - returns false if the "invalid-check-digit-on-input" is set
11741091
*/
11751092
PG_FUNCTION_INFO_V1(is_valid);

‎contrib/isn/isn.h

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Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
88
*
99
* IDENTIFICATION
10-
* $PostgreSQL: pgsql/contrib/isn/isn.h,v 1.3 2007/01/05 22:19:18 momjian Exp $
10+
* $PostgreSQL: pgsql/contrib/isn/isn.h,v 1.4 2007/06/05 21:31:03 tgl Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -38,13 +38,6 @@ extern Datum ismn_in(PG_FUNCTION_ARGS);
3838
extern Datum issn_in(PG_FUNCTION_ARGS);
3939
extern Datum upc_in(PG_FUNCTION_ARGS);
4040

41-
extern Datum ean13_cast_to_text(PG_FUNCTION_ARGS);
42-
extern Datum isn_cast_to_text(PG_FUNCTION_ARGS);
43-
extern Datum ean13_cast_from_text(PG_FUNCTION_ARGS);
44-
extern Datum isbn_cast_from_text(PG_FUNCTION_ARGS);
45-
extern Datum ismn_cast_from_text(PG_FUNCTION_ARGS);
46-
extern Datum issn_cast_from_text(PG_FUNCTION_ARGS);
47-
extern Datum upc_cast_from_text(PG_FUNCTION_ARGS);
4841
extern Datum isbn_cast_from_ean13(PG_FUNCTION_ARGS);
4942
extern Datum ismn_cast_from_ean13(PG_FUNCTION_ARGS);
5043
extern Datum issn_cast_from_ean13(PG_FUNCTION_ARGS);

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