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/**
* Copyright (C) 2018-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/platform/basic.h"
#include "mongo/db/pipeline/accumulator.h"
#include "mongo/db/pipeline/accumulation_statement.h"
#include "mongo/db/pipeline/expression_context.h"
#include "mongo/db/pipeline/value.h"
namespace mongo {
using boost::intrusive_ptr;
using std::vector;
REGISTER_ACCUMULATOR(push, AccumulatorPush::create);
const char* AccumulatorPush::getOpName() const {
return "$push";
}
void AccumulatorPush::processInternal(const Value& input, bool merging) {
if (!merging) {
if (!input.missing()) {
vpValue.push_back(input);
_memUsageBytes += input.getApproximateSize();
}
} else {
// If we're merging, we need to take apart the arrays we
// receive and put their elements into the array we are collecting.
// If we didn't, then we'd get an array of arrays, with one array
// from each merge source.
verify(input.getType() == Array);
const vector<Value>& vec = input.getArray();
vpValue.insert(vpValue.end(), vec.begin(), vec.end());
for (size_t i = 0; i < vec.size(); i++) {
_memUsageBytes += vec[i].getApproximateSize();
}
}
}
Value AccumulatorPush::getValue(bool toBeMerged) {
return Value(vpValue);
}
AccumulatorPush::AccumulatorPush(const boost::intrusive_ptr<ExpressionContext>& expCtx)
: Accumulator(expCtx) {
_memUsageBytes = sizeof(*this);
}
void AccumulatorPush::reset() {
vector<Value>().swap(vpValue);
_memUsageBytes = sizeof(*this);
}
intrusive_ptr<Accumulator> AccumulatorPush::create(
const boost::intrusive_ptr<ExpressionContext>& expCtx) {
return new AccumulatorPush(expCtx);
}
}
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