beedb/include/plan/logical/node/aggregation_node.h

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2022-04-04 20:25:01 +02:00
/*------------------------------------------------------------------------------*
* Architecture & Implementation of DBMS *
*------------------------------------------------------------------------------*
* Copyright 2022 Databases and Information Systems Group TU Dortmund *
* Visit us at *
* http://dbis.cs.tu-dortmund.de/cms/en/home/ *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR *
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, *
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR *
* OTHER DEALINGS IN THE SOFTWARE. *
* *
* Authors: *
* Maximilian Berens <maximilian.berens@tu-dortmund.de> *
* Roland Kühn <roland.kuehn@cs.tu-dortmund.de> *
* Jan Mühlig <jan.muehlig@tu-dortmund.de> *
*------------------------------------------------------------------------------*
*/
#pragma once
#include "node_interface.h"
namespace beedb::plan::logical
{
class AggregationNode final : public UnaryNode
{
public:
AggregationNode(std::vector<std::unique_ptr<expression::Operation>> &&aggregations,
std::vector<expression::Term> &&group_by)
: UnaryNode("Aggregation"), _aggregation_expressions(std::move(aggregations)),
_group_expressions(std::move(group_by))
{
}
~AggregationNode() override = default;
[[nodiscard]] const std::vector<std::unique_ptr<expression::Operation>> &aggregation_expressions() const
{
return _aggregation_expressions;
}
[[nodiscard]] const std::vector<expression::Term> &group_expressions() const
{
return _group_expressions;
}
const Schema &check_and_emit_schema(TableMap &tables) override
{
_schema.clear();
child()->check_and_emit_schema(tables);
for (auto &group : _group_expressions)
{
tables.check_and_replace_table(group.get<expression::Attribute>());
}
for (const auto &aggregation : _aggregation_expressions)
{
if (aggregation->result().has_value())
{
_schema.push_back(aggregation->result().value());
}
}
std::copy(_group_expressions.begin(), _group_expressions.end(), std::back_inserter(_schema));
return _schema;
}
[[nodiscard]] const Schema &schema() const override
{
return _schema;
}
private:
std::vector<std::unique_ptr<expression::Operation>> _aggregation_expressions;
std::vector<expression::Term> _group_expressions;
Schema _schema;
};
} // namespace beedb::plan::logical