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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 "mongo/db/exec/sbe/stages/stages.h"
#include "mongo/db/exec/sbe/values/bson.h"
namespace mongo {
namespace sbe {
/**
* Scans a vector of BSON documents. The resulting BSON documents are placed into the
* given 'recordSlot', if provided.
*
* The caller can also optionally provide a vector of top-level field names, 'fields', to extract
* from each BSON object. The resulting values are placed into the slots indicated by the 'vars'
* slot vector each time this stage advances. The provided 'fields' and 'vars' vectors must be of
* equal length.
*/
class BSONScanStage final : public PlanStage {
public:
BSONScanStage(std::vector<BSONObj> bsons,
boost::optional<value::SlotId> recordSlot,
PlanNodeId planNodeId,
std::vector<std::string> fields = {},
value::SlotVector vars = {},
bool participateInTrialRunTracking = true);
std::unique_ptr<PlanStage> clone() const final;
void prepare(CompileCtx& ctx) final;
value::SlotAccessor* getAccessor(CompileCtx& ctx, value::SlotId slot) final;
void open(bool reOpen) final;
PlanState getNext() final;
void close() final;
std::unique_ptr<PlanStageStats> getStats(bool includeDebugInfo) const final;
const SpecificStats* getSpecificStats() const final;
std::vector<DebugPrinter::Block> debugPrint() const final;
size_t estimateCompileTimeSize() const final;
private:
const std::vector<BSONObj> _bsons;
const boost::optional<value::SlotId> _recordSlot;
const std::vector<std::string> _fields;
const value::SlotVector _vars;
std::unique_ptr<value::ViewOfValueAccessor> _recordAccessor;
value::FieldViewAccessorMap _fieldAccessors;
value::SlotAccessorMap _varAccessors;
std::vector<BSONObj>::const_iterator _bsonCurrent;
ScanStats _specificStats;
};
} // namespace sbe
} // namespace mongo
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