|
492.3.9
by Lee
code clean move Item_func_abs, Item_func_int_exp, Item_func_ln, Item_func_log to functions directory |
1 |
/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
|
2 |
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
|
|
3 |
*
|
|
|
1999.6.1
by kalebral at gmail
update Copyright strings to a more common format to help with creating the master debian copyright file |
4 |
* Copyright (C) 2008 Sun Microsystems, Inc.
|
|
492.3.9
by Lee
code clean move Item_func_abs, Item_func_int_exp, Item_func_ln, Item_func_log to functions directory |
5 |
*
|
6 |
* This program is free software; you can redistribute it and/or modify
|
|
7 |
* it under the terms of the GNU General Public License as published by
|
|
8 |
* the Free Software Foundation; version 2 of the License.
|
|
9 |
*
|
|
10 |
* This program is distributed in the hope that it will be useful,
|
|
11 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
12 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
13 |
* GNU General Public License for more details.
|
|
14 |
*
|
|
15 |
* You should have received a copy of the GNU General Public License
|
|
16 |
* along with this program; if not, write to the Free Software
|
|
17 |
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
18 |
*/
|
|
19 |
||
|
1241.9.36
by Monty Taylor
ZOMG. I deleted drizzled/server_includes.h. |
20 |
#include "config.h" |
|
1241.9.1
by Monty Taylor
Removed global.h. Fixed all the headers. |
21 |
#include <math.h> |
|
1759.3.6
by Stewart Smith
move LOG(), LOG2() and LOG10() functions into math_functions plugin |
22 |
#include "log.h" |
|
492.3.9
by Lee
code clean move Item_func_abs, Item_func_int_exp, Item_func_ln, Item_func_log to functions directory |
23 |
|
|
1280.1.10
by Monty Taylor
Put everything in drizzled into drizzled namespace. |
24 |
namespace drizzled |
25 |
{
|
|
26 |
||
|
492.3.9
by Lee
code clean move Item_func_abs, Item_func_int_exp, Item_func_ln, Item_func_log to functions directory |
27 |
/**
|
28 |
Extended but so slower LOG function.
|
|
29 |
||
30 |
We have to check if all values are > zero and first one is not one
|
|
31 |
as these are the cases then result is not a number.
|
|
32 |
*/
|
|
33 |
double Item_func_log::val_real() |
|
34 |
{
|
|
35 |
assert(fixed == 1); |
|
36 |
double value= args[0]->val_real(); |
|
37 |
if ((null_value= args[0]->null_value)) |
|
38 |
return 0.0; |
|
39 |
if (value <= 0.0) |
|
40 |
{
|
|
41 |
signal_divide_by_null(); |
|
42 |
return 0.0; |
|
43 |
}
|
|
44 |
if (arg_count == 2) |
|
45 |
{
|
|
46 |
double value2= args[1]->val_real(); |
|
47 |
if ((null_value= args[1]->null_value)) |
|
48 |
return 0.0; |
|
49 |
if (value2 <= 0.0 || value == 1.0) |
|
50 |
{
|
|
51 |
signal_divide_by_null(); |
|
52 |
return 0.0; |
|
53 |
}
|
|
54 |
return log(value2) / log(value); |
|
55 |
}
|
|
56 |
return log(value); |
|
57 |
}
|
|
58 |
||
59 |
double Item_func_log2::val_real() |
|
60 |
{
|
|
61 |
assert(fixed == 1); |
|
62 |
double value= args[0]->val_real(); |
|
63 |
||
64 |
if ((null_value=args[0]->null_value)) |
|
65 |
return 0.0; |
|
66 |
if (value <= 0.0) |
|
67 |
{
|
|
68 |
signal_divide_by_null(); |
|
69 |
return 0.0; |
|
70 |
}
|
|
71 |
return log(value) / M_LN2; |
|
72 |
}
|
|
73 |
||
74 |
double Item_func_log10::val_real() |
|
75 |
{
|
|
76 |
assert(fixed == 1); |
|
77 |
double value= args[0]->val_real(); |
|
78 |
if ((null_value= args[0]->null_value)) |
|
79 |
return 0.0; |
|
80 |
if (value <= 0.0) |
|
81 |
{
|
|
82 |
signal_divide_by_null(); |
|
83 |
return 0.0; |
|
84 |
}
|
|
85 |
return log10(value); |
|
86 |
}
|
|
87 |
||
|
1280.1.10
by Monty Taylor
Put everything in drizzled into drizzled namespace. |
88 |
} /* namespace drizzled */ |