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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.
*/
#include "mongo/db/exec/unpack_timeseries_bucket.h"
namespace mongo {
namespace {
void transitionToOwnedObj(Document&& doc, WorkingSetMember* member) {
member->keyData.clear();
member->recordId = {};
member->doc = {{}, std::move(doc)};
member->transitionToOwnedObj();
}
} // namespace
const char* UnpackTimeseriesBucket::kStageType = "UNPACK_BUCKET";
UnpackTimeseriesBucket::UnpackTimeseriesBucket(ExpressionContext* expCtx,
WorkingSet* ws,
std::unique_ptr<PlanStage> child,
BucketUnpacker bucketUnpacker)
: PlanStage{kStageType, expCtx}, _ws{*ws}, _bucketUnpacker{std::move(bucketUnpacker)} {
_children.emplace_back(std::move(child));
}
std::unique_ptr<PlanStageStats> UnpackTimeseriesBucket::getStats() {
_commonStats.isEOF = isEOF();
auto ret = std::make_unique<PlanStageStats>(_commonStats, stageType());
ret->specific = std::make_unique<UnpackTimeseriesBucketStats>(_specificStats);
ret->children.emplace_back(child()->getStats());
return ret;
}
PlanStage::StageState UnpackTimeseriesBucket::doWork(WorkingSetID* out) {
if (isEOF()) {
return PlanStage::IS_EOF;
}
if (!_bucketUnpacker.hasNext()) {
auto id = WorkingSet::INVALID_ID;
auto status = child()->work(&id);
if (PlanStage::ADVANCED == status) {
auto member = _ws.get(id);
// Make an owned copy of the bucket document if necessary. The bucket will be unwound
// across multiple calls to 'doWork()', so we need to hold our own copy in the query
// execution layer in case the storage engine reclaims the memory for the bucket between
// calls to 'doWork()'.
auto ownedBucket = member->doc.value().toBson().getOwned();
_bucketUnpacker.reset(std::move(ownedBucket));
auto measurement = _bucketUnpacker.getNext();
transitionToOwnedObj(std::move(measurement), member);
++_specificStats.nBucketsUnpacked;
*out = id;
} else if (PlanStage::NEED_YIELD == status) {
*out = id;
}
return status;
}
auto measurement = _bucketUnpacker.getNext();
*out = _ws.allocate();
auto member = _ws.get(*out);
transitionToOwnedObj(std::move(measurement), member);
return PlanStage::ADVANCED;
}
} // namespace mongo
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