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体验新版 GitCode,发现更多精彩内容 >>
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4a586bd4
编写于
5月 08, 2008
作者:
B
Bruce Momjian
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差异文件
Add regression test for various power expressions with a zero base, and
adjust source code to be more modular.
上级
6b4e9d16
变更
3
隐藏空白更改
内联
并排
Showing
3 changed file
with
25 addition
and
16 deletion
+25
-16
src/backend/utils/adt/numeric.c
src/backend/utils/adt/numeric.c
+17
-16
src/test/regress/expected/float8.out
src/test/regress/expected/float8.out
+6
-0
src/test/regress/sql/float8.sql
src/test/regress/sql/float8.sql
+2
-0
未找到文件。
src/backend/utils/adt/numeric.c
浏览文件 @
4a586bd4
...
...
@@ -14,7 +14,7 @@
* Copyright (c) 1998-2008, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/numeric.c,v 1.11
1 2008/05/08 19:25:38
momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/numeric.c,v 1.11
2 2008/05/08 22:17:54
momjian Exp $
*
*-------------------------------------------------------------------------
*/
...
...
@@ -5170,21 +5170,6 @@ power_var(NumericVar *base, NumericVar *exp, NumericVar *result)
int
local_rscale
;
double
val
;
/*
* This avoids log(0) for cases of 0 raised to a non-integer.
* Also, while 0 ^ 0 can be either 1 or indeterminate (error), we
* treat it as one because most programming languages do this.
* http://en.wikipedia.org/wiki/Exponentiation#Zero_to_the_zero_power
*/
if
(
cmp_var
(
base
,
&
const_zero
)
==
0
)
{
if
(
cmp_var
(
exp
,
&
const_zero
)
==
0
)
set_var_from_var
(
&
const_one
,
result
);
else
set_var_from_var
(
&
const_zero
,
result
);
return
;
}
/* If exp can be represented as an integer, use power_var_int */
if
(
exp
->
ndigits
==
0
||
exp
->
ndigits
<=
exp
->
weight
+
1
)
{
...
...
@@ -5217,6 +5202,17 @@ power_var(NumericVar *base, NumericVar *exp, NumericVar *result)
free_var
(
&
x
);
}
/*
* This avoids log(0) for cases of 0 raised to a non-integer.
* 0 ^ 0 handled by power_var_int().
*/
if
(
cmp_var
(
base
,
&
const_zero
)
==
0
)
{
set_var_from_var
(
&
const_zero
,
result
);
result
->
dscale
=
NUMERIC_MIN_SIG_DIGITS
;
/* no need to round */
return
;
}
init_var
(
&
ln_base
);
init_var
(
&
ln_num
);
...
...
@@ -5284,6 +5280,11 @@ power_var_int(NumericVar *base, int exp, NumericVar *result, int rscale)
switch
(
exp
)
{
case
0
:
/*
* While 0 ^ 0 can be either 1 or indeterminate (error), we
* treat it as 1 because most programming languages do this.
* http://en.wikipedia.org/wiki/Exponentiation#Zero_to_the_zero_power
*/
set_var_from_var
(
&
const_one
,
result
);
result
->
dscale
=
rscale
;
/* no need to round */
return
;
...
...
src/test/regress/expected/float8.out
浏览文件 @
4a586bd4
...
...
@@ -349,6 +349,12 @@ SELECT '' AS bad, f.f1 * '1e200' from FLOAT8_TBL f;
ERROR: value out of range: overflow
SELECT '' AS bad, f.f1 ^ '1e200' from FLOAT8_TBL f;
ERROR: value out of range: overflow
SELECT 0 ^ 0 + 0 ^ 1 + 0 ^ 0.0 + 0 ^ 0.5;
?column?
----------
2
(1 row)
SELECT '' AS bad, ln(f.f1) from FLOAT8_TBL f where f.f1 = '0.0' ;
ERROR: cannot take logarithm of zero
SELECT '' AS bad, ln(f.f1) from FLOAT8_TBL f where f.f1 < '0.0' ;
...
...
src/test/regress/sql/float8.sql
浏览文件 @
4a586bd4
...
...
@@ -129,6 +129,8 @@ SELECT '' AS bad, f.f1 * '1e200' from FLOAT8_TBL f;
SELECT
''
AS
bad
,
f
.
f1
^
'1e200'
from
FLOAT8_TBL
f
;
SELECT
0
^
0
+
0
^
1
+
0
^
0
.
0
+
0
^
0
.
5
;
SELECT
''
AS
bad
,
ln
(
f
.
f1
)
from
FLOAT8_TBL
f
where
f
.
f1
=
'0.0'
;
SELECT
''
AS
bad
,
ln
(
f
.
f1
)
from
FLOAT8_TBL
f
where
f
.
f1
<
'0.0'
;
...
...
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