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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/platform/basic.h"
#include "mongo/db/pipeline/accumulator_for_window_functions.h"
#include "mongo/db/exec/document_value/value.h"
#include "mongo/db/pipeline/accumulation_statement.h"
#include "mongo/db/pipeline/expression.h"
#include "mongo/db/pipeline/window_function/window_function_expression.h"
namespace mongo {
REGISTER_STABLE_WINDOW_FUNCTION(integral, mongo::window_function::ExpressionIntegral::parse);
AccumulatorIntegral::AccumulatorIntegral(ExpressionContext* const expCtx,
boost::optional<long long> unitMillis)
: AccumulatorForWindowFunctions(expCtx),
_integralWF(expCtx, unitMillis, true /* isNonremovable */) {
_memUsageBytes = sizeof(*this);
}
void AccumulatorIntegral::processInternal(const Value& input, bool merging) {
tassert(5558800, "$integral can't be merged", !merging);
_integralWF.add(input);
_memUsageBytes = sizeof(*this) + _integralWF.getApproximateSize() - sizeof(_integralWF);
}
Value AccumulatorIntegral::getValue(bool toBeMerged) {
return _integralWF.getValue();
}
void AccumulatorIntegral::reset() {
_integralWF.reset();
_memUsageBytes = sizeof(*this);
}
boost::intrusive_ptr<AccumulatorState> AccumulatorIntegral::create(
ExpressionContext* const expCtx, boost::optional<long long> unitMillis) {
return new AccumulatorIntegral(expCtx, unitMillis);
}
} // namespace mongo
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