beedb/include/plan/logical/node/scan_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"
#include "schema.h"
#include "table.h"
#include <database.h>
namespace beedb::plan::logical
{
class TableScanNode final : public NodeInterface
{
public:
TableScanNode(Database &database, TableReference &&table_reference)
: NodeInterface("Sequential Scan"), _database(database), _table_reference(std::move(table_reference))
{
}
~TableScanNode() override = default;
const Schema &check_and_emit_schema(TableMap &tables) override
{
_schema.clear();
if (_database.table_exists(_table_reference.table_name()) == false)
{
throw exception::TableNotFoundException(_table_reference.table_name());
}
auto *table = _database.table(_table_reference.table_name());
tables.insert(table, _table_reference.table_alias());
_schema.reserve(table->schema().size());
for (const auto &term : table->schema().terms())
{
const auto &attribute_name = term.get<expression::Attribute>().column_name();
_schema.emplace_back(
expression::Term{expression::Attribute{_table_reference.table_alias(), attribute_name}});
}
return _schema;
}
[[nodiscard]] const Schema &schema() const override
{
return _schema;
}
[[nodiscard]] const TableReference &table() const
{
return _table_reference;
}
[[nodiscard]] nlohmann::json to_json() const override
{
auto json = NodeInterface::to_json();
json["data"] = _table_reference.table_name();
return json;
}
private:
Database &_database;
TableReference _table_reference;
Schema _schema;
};
class IndexScanNode final : public NodeInterface
{
public:
IndexScanNode(Database &database, TableReference &&table_reference, expression::Attribute &&attribute,
std::unique_ptr<expression::Operation> &&predicate)
: NodeInterface("Index Scan"), _database(database), _table_reference(std::move(table_reference)),
_attribute(std::move(attribute)), _predicate(std::move(predicate))
{
}
~IndexScanNode() override = default;
const Schema &check_and_emit_schema(TableMap &tables) override
{
_schema.clear();
if (_database.table_exists(_table_reference.table_name()) == false)
{
throw exception::TableNotFoundException(_table_reference.table_name());
}
auto *table = _database.table(_table_reference.table_name());
tables.insert(table, _table_reference.table_name());
tables.check_and_replace_table(_predicate);
tables.check_and_replace_table(_attribute);
_schema.reserve(table->schema().size());
for (const auto &term : table->schema().terms())
{
const auto &attribute_name = term.get<expression::Attribute>().column_name();
_schema.emplace_back(
expression::Term{expression::Attribute{_table_reference.table_alias(), attribute_name}});
}
return _schema;
}
[[nodiscard]] const Schema &schema() const override
{
return _schema;
}
[[nodiscard]] const TableReference &table() const
{
return _table_reference;
}
[[nodiscard]] const std::unique_ptr<expression::Operation> &predicate() const
{
return _predicate;
}
[[nodiscard]] const expression::Attribute &attribute() const
{
return _attribute;
}
void schema(const Schema &schema)
{
_schema.clear();
std::copy(schema.begin(), schema.end(), std::back_inserter(_schema));
}
private:
Database &_database;
TableReference _table_reference;
expression::Attribute _attribute;
std::unique_ptr<expression::Operation> _predicate;
Schema _schema;
};
} // namespace beedb::plan::logical