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
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
/**
* Copyright (C) 2019-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 <boost/intrusive_ptr.hpp>
#include <boost/optional.hpp>
#include <cstdint>
#include <string>
#include <utility>
#include "mongo/base/string_data.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/db/commands.h"
#include "mongo/db/commands/map_reduce_agg.h"
#include "mongo/db/commands/map_reduce_javascript_code.h"
#include "mongo/db/commands/mr_common.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/exec/document_value/value.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/pipeline/expression.h"
#include "mongo/db/pipeline/pipeline_d.h"
#include "mongo/db/query/map_reduce_output_format.h"
namespace mongo::map_reduce_agg {
namespace {
auto makeExpressionContext(OperationContext* opCtx, const MapReduce& parsedMr) {
// AutoGetCollectionForReadCommand will throw if the sharding version for this connection is
// out of date.
AutoGetCollectionForReadCommand ctx(
opCtx, parsedMr.getNamespace(), AutoGetCollection::ViewMode::kViewsPermitted);
uassert(ErrorCodes::CommandNotSupportedOnView,
"mapReduce on a view is not yet supported",
!ctx.getView());
auto resolvedCollator = PipelineD::resolveCollator(
opCtx, parsedMr.getCollation().get_value_or(BSONObj()), ctx.getCollection());
// The UUID of the collection for the execution namespace of this aggregation.
auto uuid =
ctx.getCollection() ? boost::make_optional(ctx.getCollection()->uuid()) : boost::none;
auto runtimeConstants = Variables::generateRuntimeConstants(opCtx);
if (parsedMr.getScope()) {
runtimeConstants.setJsScope(parsedMr.getScope()->getObj());
}
// Manually build an ExpressionContext with the desired options for the translated
// aggregation. The one option worth noting here is allowDiskUse, which is required to allow
// the $group stage of the translated pipeline to spill to disk.
return make_intrusive<ExpressionContext>(
opCtx,
boost::none, // explain
false, // fromMongos
false, // needsmerge
true, // allowDiskUse
parsedMr.getBypassDocumentValidation().get_value_or(false),
parsedMr.getNamespace(),
parsedMr.getCollation().get_value_or(BSONObj()),
runtimeConstants,
std::move(resolvedCollator),
MongoProcessInterface::create(opCtx),
StringMap<ExpressionContext::ResolvedNamespace>{}, // resolvedNamespaces
uuid);
}
} // namespace
bool runAggregationMapReduce(OperationContext* opCtx,
const std::string& dbname,
const BSONObj& cmd,
std::string& errmsg,
BSONObjBuilder& result) {
auto exhaustPipelineIntoBSONArray = [](auto&& pipeline) {
BSONArrayBuilder bab;
while (auto&& doc = pipeline->getNext())
bab.append(doc->toBson());
return bab.arr();
};
auto parsedMr = MapReduce::parse(IDLParserErrorContext("MapReduce"), cmd);
auto expCtx = makeExpressionContext(opCtx, parsedMr);
auto runnablePipeline = [&]() {
auto pipeline = map_reduce_common::translateFromMR(parsedMr, expCtx);
return expCtx->mongoProcessInterface->attachCursorSourceToPipelineForLocalRead(
expCtx, pipeline.release());
}();
if (parsedMr.getOutOptions().getOutputType() == OutputType::InMemory) {
map_reduce_output_format::appendInlineResponse(
exhaustPipelineIntoBSONArray(runnablePipeline),
boost::get_optional_value_or(parsedMr.getVerbose(), false),
false,
&result);
} else {
// For non-inline output, the pipeline should not return any results however getNext() still
// needs to be called once to ensure documents are written to the output collection.
invariant(!runnablePipeline->getNext());
map_reduce_output_format::appendOutResponse(
parsedMr.getOutOptions().getDatabaseName(),
parsedMr.getOutOptions().getCollectionName(),
boost::get_optional_value_or(parsedMr.getVerbose(), false),
false,
&result);
}
return true;
}
} // namespace mongo::map_reduce_agg
|
