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plan_explainer_express.cpp
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plan_explainer_express.cpp
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/**
* Copyright (C) 2024-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/plan_explainer_express.h"
#include "mongo/db/keypattern.h"
namespace mongo {
std::string PlanExplainerExpress::getPlanSummary() const {
std::string ps = _iteratorStats->stageName();
if (!_iteratorStats->indexKeyPattern().empty()) {
ps += " " + _iteratorStats->indexKeyPattern();
}
if (!_writeOperationStats->stageName().empty()) {
ps += "," + _writeOperationStats->stageName();
}
return ps;
}
void PlanExplainerExpress::getSummaryStats(PlanSummaryStats* statsOut) const {
statsOut->nReturned = _planStats->numResults();
_iteratorStats->populateSummaryStats(statsOut);
}
PlanExplainer::PlanStatsDetails PlanExplainerExpress::getWinningPlanStats(
ExplainOptions::Verbosity verbosity) const {
BSONObjBuilder bob;
bob.append("isCached", false);
if (_writeOperationStats->stageName().empty()) {
bob.append("stage"_sd, _iteratorStats->stageName());
} else {
bob.append("stage"_sd, _writeOperationStats->stageName());
}
_iteratorStats->appendDataAccessStats(bob);
PlanSummaryStats stats;
getSummaryStats(&stats);
if (verbosity >= ExplainOptions::Verbosity::kExecStats) {
bob.appendNumber("keysExamined", static_cast<long long>(stats.totalKeysExamined));
bob.appendNumber("docsExamined", static_cast<long long>(stats.totalDocsExamined));
bob.appendNumber("nReturned", static_cast<long long>(stats.nReturned));
if (!_writeOperationStats->stageName().empty()) {
_writeOperationStats->populateExecStats(bob);
}
}
return {bob.obj(), stats};
}
} // namespace mongo