blob: 773177efd056cb57cbcd25991c9d6b6fd65fefc0 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
/**
* Copyright (c) 2011 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#define MONGO_PCH_WHITELISTED
#include "mongo/platform/basic.h"
#include "mongo/pch.h"
#undef MONGO_PCH_WHITELISTED
#include "mongo/db/pipeline/accumulator.h"
#include "mongo/db/pipeline/document.h"
#include "mongo/db/pipeline/expression_context.h"
#include "mongo/db/pipeline/value.h"
namespace mongo {
namespace {
const char subTotalName[] = "subTotal";
const char countName[] = "count";
}
void AccumulatorAvg::processInternal(const Value& input, bool merging) {
if (!merging) {
// non numeric types have no impact on average
if (!input.numeric())
return;
_total += input.getDouble();
_count += 1;
}
else {
// We expect an object that contains both a subtotal and a count.
// This is what getValue(true) produced below.
verify(input.getType() == Object);
_total += input[subTotalName].getDouble();
_count += input[countName].getLong();
}
}
intrusive_ptr<Accumulator> AccumulatorAvg::create() {
return new AccumulatorAvg();
}
Value AccumulatorAvg::getValue(bool toBeMerged) const {
if (!toBeMerged) {
if (_count == 0)
return Value(0.0);
return Value(_total / static_cast<double>(_count));
}
else {
return Value(DOC(subTotalName << _total
<< countName << _count));
}
}
AccumulatorAvg::AccumulatorAvg()
: _total(0)
, _count(0)
{
// This is a fixed size Accumulator so we never need to update this
_memUsageBytes = sizeof(*this);
}
void AccumulatorAvg::reset() {
_total = 0;
_count = 0;
}
const char *AccumulatorAvg::getOpName() const {
return "$avg";
}
}
|