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/**
* Copyright (C) 2019-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 <queue>
#include "mongo/db/exec/sbe/stages/stages.h"
#include "mongo/db/query/plan_executor.h"
#include "mongo/db/query/plan_explainer_sbe.h"
#include "mongo/db/query/plan_yield_policy_sbe.h"
#include "mongo/db/query/sbe_plan_ranker.h"
#include "mongo/db/query/sbe_runtime_planner.h"
#include "mongo/db/query/sbe_stage_builder.h"
namespace mongo {
class PlanExecutorSBE final : public PlanExecutor {
public:
PlanExecutorSBE(OperationContext* opCtx,
std::unique_ptr<CanonicalQuery> cq,
sbe::CandidatePlans candidates,
const CollectionPtr& collection,
bool returnOwnedBson,
NamespaceString nss,
bool isOpen,
std::unique_ptr<PlanYieldPolicySBE> yieldPolicy);
CanonicalQuery* getCanonicalQuery() const override {
return _cq.get();
}
const NamespaceString& nss() const override {
return _nss;
}
OperationContext* getOpCtx() const override {
return _opCtx;
}
void saveState();
void restoreState(const RestoreContext& context);
void detachFromOperationContext();
void reattachToOperationContext(OperationContext* opCtx);
ExecState getNext(BSONObj* out, RecordId* dlOut) override;
ExecState getNextDocument(Document* objOut, RecordId* dlOut) override;
bool isEOF() override {
return isMarkedAsKilled() || (_stash.empty() && _root->getCommonStats()->isEOF);
}
long long executeCount() override {
// Using SBE to execute a count command is not yet supported.
MONGO_UNREACHABLE;
}
UpdateResult executeUpdate() override {
// Using SBE to execute an update command is not yet supported.
MONGO_UNREACHABLE;
}
UpdateResult getUpdateResult() const override {
// Using SBE to execute an update command is not yet supported.
MONGO_UNREACHABLE;
}
long long executeDelete() override {
// Using SBE to execute a delete command is not yet supported.
MONGO_UNREACHABLE;
}
void markAsKilled(Status killStatus);
void dispose(OperationContext* opCtx);
void enqueue(const BSONObj& obj);
bool isMarkedAsKilled() const override {
return !_killStatus.isOK();
}
Status getKillStatus() override {
invariant(isMarkedAsKilled());
return _killStatus;
}
bool isDisposed() const override {
return _isDisposed;
}
Timestamp getLatestOplogTimestamp() const override;
BSONObj getPostBatchResumeToken() const override;
/**
* Even though the leaves of '_root' will acquire AutoGet objects, the caller must acquire a top
* level AutoGet object outside of this PlanExecutor in order to open a storage transaction and
* establish a consistent view of the catalog.
*/
LockPolicy lockPolicy() const override {
return LockPolicy::kLockExternally;
}
const PlanExplainer& getPlanExplainer() const final {
invariant(_planExplainer);
return *_planExplainer;
}
private:
enum class State { kClosed, kOpened };
State _state{State::kClosed};
OperationContext* _opCtx;
NamespaceString _nss;
const bool _mustReturnOwnedBson;
// CompileCtx owns the instance pointed by _env, so we must keep it around.
const std::unique_ptr<sbe::PlanStage> _root;
stage_builder::PlanStageData _rootData;
std::unique_ptr<QuerySolution> _solution;
sbe::value::SlotAccessor* _result{nullptr};
sbe::value::SlotAccessor* _resultRecordId{nullptr};
sbe::value::TypeTags _tagLastRecordId{sbe::value::TypeTags::Nothing};
sbe::value::Value _valLastRecordId{0};
sbe::RuntimeEnvironment::Accessor* _oplogTs{nullptr};
boost::optional<sbe::value::SlotId> _resumeRecordIdSlot;
std::queue<std::pair<BSONObj, boost::optional<RecordId>>> _stash;
// If we are returning owned result (i.e. value is moved out of the result accessor) then its
// lifetime must extend up to the next getNext (or saveState).
BSONObj _lastGetNext;
// If _killStatus has a non-OK value, then we have been killed and the value represents the
// reason for the kill.
Status _killStatus = Status::OK();
std::unique_ptr<CanonicalQuery> _cq;
std::unique_ptr<PlanYieldPolicySBE> _yieldPolicy;
std::unique_ptr<PlanExplainer> _planExplainer;
bool _isDisposed{false};
};
/**
* Executes getNext() on the 'root' PlanStage and used 'resultSlot' and 'recordIdSlot' to access the
* fetched document and it's record id, which are stored in 'out' and 'dlOut' parameters
* respectively, if they not null pointers.
*
* This common logic can be used by various consumers which need to fetch data using an SBE
* PlanStage tree, such as PlanExecutor or RuntimePlanner.
*/
sbe::PlanState fetchNext(sbe::PlanStage* root,
sbe::value::SlotAccessor* resultSlot,
sbe::value::SlotAccessor* recordIdSlot,
BSONObj* out,
RecordId* dlOut,
bool returnOwnedBson);
} // namespace mongo
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