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/**
* Copyright (C) 2021-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/document_value/document.h"
#include "mongo/db/exec/document_value/value.h"
#include "mongo/db/pipeline/document_source.h"
#include "mongo/db/pipeline/field_path.h"
#include "mongo/db/query/datetime/date_time_support.h"
#include "mongo/util/time_support.h"
namespace mongo {
namespace document_source_densify {
// TODO SERVER-57334 Translation logic goes here.
}
// TODO SERVER-57332 This should inherit from DocumentSource.
class DocumentSourceInternalDensify final : public DocumentSource {
public:
static constexpr StringData kStageName = "$_internalDensify"_sd;
using DensifyValueType = stdx::variant<double, Date_t>;
struct StepSpec {
double step;
boost::optional<TimeUnit> unit;
boost::optional<TimeZone> tz;
};
class DocGenerator {
public:
DocGenerator(DensifyValueType min,
DensifyValueType max,
StepSpec step,
FieldPath fieldName,
Document includeFields,
Document finalDoc);
Document getNextDocument();
bool done() const;
private:
StepSpec _step;
// The field to add to 'includeFields' to generate a document.
FieldPath _path;
Document _includeFields;
// The document that is equal to or larger than '_max' that prompted the creation of this
// generator. Will be returned after the final generated document.
Document _finalDoc;
// The minimum value that this generator will create, therefore the next generated document
// will have this value.
DensifyValueType _min;
// The maximum value that will be generated. This value is inclusive.
DensifyValueType _max;
enum class GeneratorState {
// Generating documents between '_min' and '_max'.
kGeneratingDocuments,
// Generated all necessary documents, waiting for a final 'getNextDocument()' call.
kReturningFinalDocument,
kDone,
};
GeneratorState _state = GeneratorState::kGeneratingDocuments;
};
static boost::intrusive_ptr<DocumentSourceInternalDensify> create(const boost::intrusive_ptr<ExpressionContext>& pExpCtx);
static boost::intrusive_ptr<DocumentSource> createFromBson(
BSONElement elem, const boost::intrusive_ptr<ExpressionContext>& pExpCtx);
StageConstraints constraints(Pipeline::SplitState pipeState) const final {
return {StreamType::kStreaming,
PositionRequirement::kNone,
HostTypeRequirement::kNone,
DiskUseRequirement::kNoDiskUse,
FacetRequirement::kAllowed,
TransactionRequirement::kAllowed,
LookupRequirement::kAllowed,
UnionRequirement::kAllowed};
}
const char* getSourceName() const final {
return kStageName.rawData();
}
Pipeline::SourceContainer::iterator doOptimizeAt(Pipeline::SourceContainer::iterator itr,
Pipeline::SourceContainer* container) final;
Value serialize(boost::optional<ExplainOptions::Verbosity> explain = boost::none) const final;
DepsTracker::State getDependencies(DepsTracker* deps) const final {
return DepsTracker::State::SEE_NEXT; // This doesn't affect needed fields
}
boost::optional<DistributedPlanLogic> distributedPlanLogic() final {
// Running this stage on the shards is an optimization, but is not strictly necessary in
// order to produce correct pipeline output.
// {shardsStage, mergingStage, sortPattern}
return DistributedPlanLogic{nullptr, this, boost::none};
}
DocumentSourceInternalDensify(const boost::intrusive_ptr<ExpressionContext>& pExpCtx);
GetNextResult doGetNext() final;
};
};
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