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
141
142
143
144
145
146
147
148
|
/**
* 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.
*/
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kWrite
#include "mongo/platform/basic.h"
#include "mongo/db/ops/parsed_delete.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/exec/delete.h"
#include "mongo/db/matcher/extensions_callback_real.h"
#include "mongo/db/ops/delete_request_gen.h"
#include "mongo/db/query/canonical_query.h"
#include "mongo/db/query/collation/collator_factory_interface.h"
#include "mongo/db/query/get_executor.h"
#include "mongo/db/query/query_planner_common.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/str.h"
namespace mongo {
ParsedDelete::ParsedDelete(OperationContext* opCtx, const DeleteRequest* request)
: _opCtx(opCtx), _request(request) {}
Status ParsedDelete::parseRequest() {
dassert(!_canonicalQuery.get());
// It is invalid to request that the DeleteStage return the deleted document during a
// multi-remove.
invariant(!(_request->getReturnDeleted() && _request->getMulti()));
// It is invalid to request that a ProjectionStage be applied to the DeleteStage if the
// DeleteStage would not return the deleted document.
invariant(_request->getProj().isEmpty() || _request->getReturnDeleted());
std::unique_ptr<CollatorInterface> collator(nullptr);
if (!_request->getCollation().isEmpty()) {
auto statusWithCollator = CollatorFactoryInterface::get(_opCtx->getServiceContext())
->makeFromBSON(_request->getCollation());
if (!statusWithCollator.isOK()) {
return statusWithCollator.getStatus();
}
collator = uassertStatusOK(std::move(statusWithCollator));
}
_expCtx = make_intrusive<ExpressionContext>(_opCtx,
std::move(collator),
_request->getNsString(),
_request->getLegacyRuntimeConstants(),
_request->getLet());
if (CanonicalQuery::isSimpleIdQuery(_request->getQuery())) {
return Status::OK();
}
return parseQueryToCQ();
}
Status ParsedDelete::parseQueryToCQ() {
dassert(!_canonicalQuery.get());
const ExtensionsCallbackReal extensionsCallback(_opCtx, &_request->getNsString());
// The projection needs to be applied after the delete operation, so we do not specify a
// projection during canonicalization.
auto findCommand = std::make_unique<FindCommandRequest>(_request->getNsString());
findCommand->setFilter(_request->getQuery().getOwned());
findCommand->setSort(_request->getSort().getOwned());
findCommand->setCollation(_request->getCollation().getOwned());
findCommand->setHint(_request->getHint());
// Limit should only used for the findAndModify command when a sort is specified. If a sort
// is requested, we want to use a top-k sort for efficiency reasons, so should pass the
// limit through. Generally, a delete stage expects to be able to skip documents that were
// deleted out from under it, but a limit could inhibit that and give an EOF when the delete
// has not actually deleted a document. This behavior is fine for findAndModify, but should
// not apply to deletes in general.
if (!_request->getMulti() && !_request->getSort().isEmpty()) {
findCommand->setLimit(1);
}
// If the delete request has runtime constants or let parameters attached to it, pass them to
// the FindCommandRequest.
if (auto& runtimeConstants = _request->getLegacyRuntimeConstants())
findCommand->setLegacyRuntimeConstants(*runtimeConstants);
if (auto& letParams = _request->getLet())
findCommand->setLet(*letParams);
auto statusWithCQ =
CanonicalQuery::canonicalize(_opCtx,
std::move(findCommand),
_request->getIsExplain(),
_expCtx,
extensionsCallback,
MatchExpressionParser::kAllowAllSpecialFeatures);
if (statusWithCQ.isOK()) {
_canonicalQuery = std::move(statusWithCQ.getValue());
}
return statusWithCQ.getStatus();
}
const DeleteRequest* ParsedDelete::getRequest() const {
return _request;
}
PlanYieldPolicy::YieldPolicy ParsedDelete::yieldPolicy() const {
return _request->getGod() ? PlanYieldPolicy::YieldPolicy::NO_YIELD : _request->getYieldPolicy();
}
bool ParsedDelete::hasParsedQuery() const {
return _canonicalQuery.get() != nullptr;
}
std::unique_ptr<CanonicalQuery> ParsedDelete::releaseParsedQuery() {
invariant(_canonicalQuery.get() != nullptr);
return std::move(_canonicalQuery);
}
} // namespace mongo
|
