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
|
/**
* Copyright (C) 2018 MongoDB 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.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/pipeline/document_source_geo_near_cursor.h"
#include <boost/intrusive_ptr.hpp>
#include <boost/optional.hpp>
#include <list>
#include <memory>
#include "mongo/base/string_data.h"
#include "mongo/bson/bsonelement.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/bson/simple_bsonobj_comparator.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/pipeline/document.h"
#include "mongo/db/pipeline/document_source_cursor.h"
#include "mongo/db/pipeline/document_source_sort.h"
#include "mongo/db/pipeline/expression_context.h"
#include "mongo/db/pipeline/field_path.h"
#include "mongo/db/query/plan_executor.h"
namespace mongo {
constexpr const char* DocumentSourceGeoNearCursor::kStageName;
boost::intrusive_ptr<DocumentSourceGeoNearCursor> DocumentSourceGeoNearCursor::create(
Collection* collection,
std::unique_ptr<PlanExecutor, PlanExecutor::Deleter> exec,
const boost::intrusive_ptr<ExpressionContext>& expCtx,
FieldPath distanceField,
boost::optional<FieldPath> locationField,
double distanceMultiplier) {
return {new DocumentSourceGeoNearCursor(collection,
std::move(exec),
expCtx,
std::move(distanceField),
std::move(locationField),
distanceMultiplier)};
}
DocumentSourceGeoNearCursor::DocumentSourceGeoNearCursor(
Collection* collection,
std::unique_ptr<PlanExecutor, PlanExecutor::Deleter> exec,
const boost::intrusive_ptr<ExpressionContext>& expCtx,
FieldPath distanceField,
boost::optional<FieldPath> locationField,
double distanceMultiplier)
: DocumentSourceCursor(collection, std::move(exec), expCtx),
_distanceField(std::move(distanceField)),
_locationField(std::move(locationField)),
_distanceMultiplier(distanceMultiplier) {
invariant(_distanceMultiplier >= 0);
}
const char* DocumentSourceGeoNearCursor::getSourceName() const {
return kStageName;
}
BSONObjSet DocumentSourceGeoNearCursor::getOutputSorts() {
return SimpleBSONObjComparator::kInstance.makeBSONObjSet(
{BSON(_distanceField.fullPath() << 1)});
}
Document DocumentSourceGeoNearCursor::transformBSONObjToDocument(const BSONObj& obj) const {
MutableDocument output(Document::fromBsonWithMetaData(obj));
// Scale the distance by the requested factor.
invariant(output.peek().hasGeoNearDistance(),
str::stream()
<< "Query returned a document that is unexpectedly missing the geoNear distance: "
<< obj.jsonString());
const auto distance = output.peek().getGeoNearDistance() * _distanceMultiplier;
output.setNestedField(_distanceField, Value(distance));
if (_locationField) {
invariant(
output.peek().hasGeoNearPoint(),
str::stream()
<< "Query returned a document that is unexpectedly missing the geoNear point: "
<< obj.jsonString());
output.setNestedField(*_locationField, output.peek().getGeoNearPoint());
}
// In a cluster, $geoNear will be merged via $sort, so add the sort key.
if (pExpCtx->needsMerge) {
output.setSortKeyMetaField(BSON("" << distance));
}
return output.freeze();
}
} // namespace mongo
|