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
|
/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/pipeline/accumulator.h"
#include "mongo/db/exec/document_value/value.h"
#include "mongo/db/pipeline/accumulation_statement.h"
#include "mongo/db/pipeline/expression.h"
namespace mongo {
using boost::intrusive_ptr;
/* ------------------------- AccumulatorMergeObjects ----------------------------- */
REGISTER_ACCUMULATOR(mergeObjects,
genericParseSingleExpressionAccumulator<AccumulatorMergeObjects>);
REGISTER_STABLE_EXPRESSION(mergeObjects, ExpressionFromAccumulator<AccumulatorMergeObjects>::parse);
intrusive_ptr<AccumulatorState> AccumulatorMergeObjects::create(ExpressionContext* const expCtx) {
return new AccumulatorMergeObjects(expCtx);
}
AccumulatorMergeObjects::AccumulatorMergeObjects(ExpressionContext* const expCtx)
: AccumulatorState(expCtx) {
_memUsageBytes = sizeof(*this);
}
void AccumulatorMergeObjects::reset() {
_memUsageBytes = sizeof(*this);
_output.reset();
}
void AccumulatorMergeObjects::processInternal(const Value& input, bool merging) {
if (input.nullish()) {
return;
}
uassert(40400,
str::stream() << "$mergeObjects requires object inputs, but input " << input.toString()
<< " is of type " << typeName(input.getType()),
(input.getType() == BSONType::Object));
FieldIterator iter = input.getDocument().fieldIterator();
while (iter.more()) {
Document::FieldPair pair = iter.next();
// Ignore missing values only, null and undefined are still considered.
if (pair.second.missing())
continue;
_output.setField(pair.first, std::move(pair.second));
}
_memUsageBytes = sizeof(*this) + _output.getApproximateSize();
}
Value AccumulatorMergeObjects::getValue(bool toBeMerged) {
return _output.freezeToValue();
}
} // namespace mongo
|
