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
|
/**
* 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.
*/
#pragma once
#include <optional>
#include <string>
#include "mongo/util/container_size_helper.h"
namespace mongo {
/**
* A container for the summary statistics that the profiler, slow query log, and
* other non-explain debug mechanisms may want to collect.
*/
struct PlanSummaryStats {
/**
* Helper method to accumulate the plan summary stats from the input source.
*/
void accumulate(const PlanSummaryStats& statsIn) {
// Attributes replanReason and fromMultiPlanner have been intentionally skipped as they
// always describe the left-hand side (or "local") collection.
// Consider $lookup case. $lookup runtime plan selection may happen against the foreign
// collection an arbitrary number of times. A single value of 'replanReason' and
// 'fromMultiPlanner' can't really report correctly on the behavior of arbitrarily many
// occurrences of runtime planning for a single query.
nReturned += statsIn.nReturned;
totalKeysExamined += statsIn.totalKeysExamined;
totalDocsExamined += statsIn.totalDocsExamined;
collectionScans += statsIn.collectionScans;
collectionScansNonTailable += statsIn.collectionScansNonTailable;
hasSortStage |= statsIn.hasSortStage;
usedDisk |= statsIn.usedDisk;
planFailed |= statsIn.planFailed;
indexesUsed.insert(statsIn.indexesUsed.begin(), statsIn.indexesUsed.end());
}
uint64_t estimateObjectSizeInBytes() const {
auto strSize = [](const std::string& str) {
return str.capacity() * sizeof(std::string::value_type);
};
return sizeof(*this) +
container_size_helper::estimateObjectSizeInBytes(
indexesUsed, strSize, false /* includeShallowSize */) +
(replanReason ? strSize(*replanReason) : 0);
}
// The number of results returned by the plan.
size_t nReturned = 0U;
// The total number of index keys examined by the plan.
size_t totalKeysExamined = 0U;
// The total number of documents examined by the plan.
size_t totalDocsExamined = 0U;
// The number of collection scans that occur during execution. Note that more than one
// collection scan may happen during execution (e.g. for $lookup execution).
long long collectionScans = 0;
// The number of collection scans that occur during execution which are nontailable. Note that
// more than one collection scan may happen during execution (e.g. for $lookup execution).
long long collectionScansNonTailable = 0;
// Time elapsed while executing this plan.
long long executionTimeMillisEstimate = 0;
// Did this plan use an in-memory sort stage?
bool hasSortStage = false;
// Did this plan use disk space?
bool usedDisk = false;
// Did this plan failed during execution?
bool planFailed = false;
// The names of each index used by the plan.
std::set<std::string> indexesUsed;
// Was this plan a result of using the MultiPlanStage to select a winner among several
// candidates?
bool fromMultiPlanner = false;
// Was a replan triggered during the execution of this query?
boost::optional<std::string> replanReason;
// Score calculated for the plan by PlanRanker. Only set if there were multiple candidate plans
// and allPlansExecution verbosity mode is selected.
boost::optional<double> score;
};
} // namespace mongo
|