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
|
/**
* Copyright (C) 2020-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/db/query/sbe_runtime_planner.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/exec/histogram_server_status_metric.h"
#include "mongo/db/exec/sbe/expressions/expression.h"
#include "mongo/db/exec/trial_period_utils.h"
#include "mongo/db/exec/trial_run_tracker.h"
#include "mongo/db/query/plan_executor_sbe.h"
namespace mongo::sbe {
bool BaseRuntimePlanner::fetchNextDocument(plan_ranker::CandidatePlan* candidate,
size_t maxNumResults) {
auto* resultSlot = candidate->data.resultAccessor;
auto* recordIdSlot = candidate->data.recordIdAccessor;
try {
if (!candidate->data.open) {
candidate->root->open(false);
candidate->data.open = true;
}
BSONObj obj;
RecordId recordId;
auto state = fetchNext(candidate->root.get(),
resultSlot,
recordIdSlot,
&obj,
recordIdSlot ? &recordId : nullptr,
true /* must return owned BSON */);
if (state == PlanState::IS_EOF) {
candidate->root->close();
return false;
}
invariant(state == PlanState::ADVANCED);
invariant(obj.isOwned());
candidate->results.push_back({std::move(obj), {recordIdSlot != nullptr, recordId}});
if (candidate->results.size() >= maxNumResults) {
return false;
}
} catch (const ExceptionFor<ErrorCodes::QueryTrialRunCompleted>&) {
candidate->exitedEarly = true;
return false;
} catch (const ExceptionFor<ErrorCodes::QueryExceededMemoryLimitNoDiskUseAllowed>& ex) {
candidate->root->close();
candidate->status = ex.toStatus();
return false;
}
return true;
}
std::pair<value::SlotAccessor*, value::SlotAccessor*> BaseRuntimePlanner::prepareExecutionPlan(
PlanStage* root, stage_builder::PlanStageData* data, const bool preparingFromCache) const {
invariant(root);
invariant(data);
stage_builder::prepareSlotBasedExecutableTree(
_opCtx, root, data, _cq, _collections, _yieldPolicy, preparingFromCache);
value::SlotAccessor* resultSlot{nullptr};
if (auto slot = data->outputs.getIfExists(stage_builder::PlanStageSlots::kResult); slot) {
resultSlot = root->getAccessor(data->ctx, *slot);
tassert(4822871, "Query does not have a result slot.", resultSlot);
}
value::SlotAccessor* recordIdSlot{nullptr};
if (auto slot = data->outputs.getIfExists(stage_builder::PlanStageSlots::kRecordId); slot) {
recordIdSlot = root->getAccessor(data->ctx, *slot);
tassert(4822872, "Query does not have a recordId slot.", recordIdSlot);
}
return std::make_pair(resultSlot, recordIdSlot);
}
void BaseRuntimePlanner::prepareCandidate(plan_ranker::CandidatePlan* candidate,
bool preparingFromCache) {
_indexExistenceChecker.check(_opCtx, _collections);
std::tie(candidate->data.resultAccessor, candidate->data.recordIdAccessor) =
prepareExecutionPlan(candidate->root.get(), &candidate->data.stageData, preparingFromCache);
}
void BaseRuntimePlanner::executeCachedCandidateTrial(plan_ranker::CandidatePlan* candidate,
size_t maxNumResults) {
prepareCandidate(candidate, true /*preparingFromCache*/);
while (fetchNextDocument(candidate, maxNumResults)) {
}
}
} // namespace mongo::sbe
|
