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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/pipeline/document_source.h"
namespace mongo {
/**
* Carries parameters for converting index stats on the buckets collection to the time-series
* collection schema.
*/
struct TimeseriesConversionOptions {
// The user-supplied timestamp field name specified during time-series collection creation.
std::string timeField;
// An optional user-supplied metadata field name specified during time-series collection
// creation. This field name is used during materialization of metadata fields of a measurement
// after unpacking.
boost::optional<std::string> metaField;
};
/**
* Aggregation stage that converts buckets schema index stats to time-series schema index stats.
*/
class DocumentSourceInternalConvertBucketIndexStats : public DocumentSource {
public:
static constexpr StringData kStageName = "$_internalConvertBucketIndexStats"_sd;
static boost::intrusive_ptr<DocumentSource> createFromBson(
BSONElement elem, const boost::intrusive_ptr<ExpressionContext>& expCtx);
DocumentSourceInternalConvertBucketIndexStats(
const boost::intrusive_ptr<ExpressionContext>& expCtx,
TimeseriesConversionOptions timeseriesOptions);
const char* getSourceName() const override {
return kStageName.rawData();
}
StageConstraints constraints(Pipeline::SplitState pipeState) const final {
return {StreamType::kStreaming,
PositionRequirement::kNone,
HostTypeRequirement::kNone,
DiskUseRequirement::kNoDiskUse,
FacetRequirement::kNotAllowed,
TransactionRequirement::kAllowed,
LookupRequirement::kAllowed,
UnionRequirement::kAllowed,
ChangeStreamRequirement::kDenylist};
}
Value serialize(boost::optional<ExplainOptions::Verbosity> explain = boost::none) const final;
boost::optional<DistributedPlanLogic> distributedPlanLogic() final {
return boost::none;
};
private:
GetNextResult doGetNext() final;
TimeseriesConversionOptions _timeseriesOptions;
};
} // namespace mongo
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