99 lines
3.9 KiB
C++
99 lines
3.9 KiB
C++
/*------------------------------------------------------------------------------*
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* Architecture & Implementation of DBMS *
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*------------------------------------------------------------------------------*
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* Copyright 2022 Databases and Information Systems Group TU Dortmund *
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* Visit us at *
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* http://dbis.cs.tu-dortmund.de/cms/en/home/ *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR *
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, *
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR *
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* OTHER DEALINGS IN THE SOFTWARE. *
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* *
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* Authors: *
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* Maximilian Berens <maximilian.berens@tu-dortmund.de> *
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* Roland Kühn <roland.kuehn@cs.tu-dortmund.de> *
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* Jan Mühlig <jan.muehlig@tu-dortmund.de> *
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*------------------------------------------------------------------------------*
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*/
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#pragma once
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#include "node_interface.h"
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#include <sstream>
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namespace beedb::plan::logical
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{
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class ProjectionNode final : public UnaryNode
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{
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public:
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explicit ProjectionNode(Schema &&schema) : UnaryNode("Projection"), _schema(std::move(schema))
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{
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}
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~ProjectionNode() override = default;
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const Schema &check_and_emit_schema(TableMap &tables) override
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{
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const auto &child_schema = child()->check_and_emit_schema(tables);
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// TODO: Check
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for (auto &term : _schema)
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{
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if (term.is_attribute() && term.is_generated() == false)
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{
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tables.check_and_replace_table(term.get<expression::Attribute>());
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}
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}
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// TODO: Rebuild schema or use own schema just for order?
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Schema real_schema;
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for (auto &term : _schema)
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{
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if (term.is_attribute())
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{
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auto &attribute = term.get<expression::Attribute>();
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const auto asterisk_has_table = attribute.table_name().has_value();
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if (attribute.is_asterisk())
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{
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for (const auto &child_term : child_schema)
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{
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if (asterisk_has_table == false)
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{
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real_schema.push_back(child_term);
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}
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else if (child_term.is_attribute() &&
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child_term.get<expression::Attribute>().table_name() == attribute.table_name())
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{
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real_schema.emplace_back(expression::Attribute{child_term.get<expression::Attribute>(),
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attribute.is_print_table_name()});
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}
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}
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}
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else
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{
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real_schema.emplace_back(std::move(term));
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}
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}
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else
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{
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real_schema.emplace_back(std::move(term));
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}
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}
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_schema = std::move(real_schema);
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return _schema;
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}
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[[nodiscard]] const Schema &schema() const override
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{
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return _schema;
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}
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private:
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Schema _schema;
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};
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} // namespace beedb::plan::logical
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