72 lines
2.8 KiB
C
72 lines
2.8 KiB
C
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/*------------------------------------------------------------------------------*
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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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namespace beedb::plan::logical
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{
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class LimitNode final : public UnaryNode
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{
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public:
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LimitNode(std::uint64_t limit, std::uint64_t offset) : UnaryNode("Limit"), _limit(limit), _offset(offset)
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{
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}
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~LimitNode() override = default;
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[[nodiscard]] std::uint64_t limit() const
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{
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return _limit;
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}
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[[nodiscard]] std::uint64_t offset() const
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{
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return _offset;
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}
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const Schema &check_and_emit_schema(TableMap &tables) override
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{
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_schema.clear();
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const auto &child_schema = child()->check_and_emit_schema(tables);
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std::copy(child_schema.begin(), child_schema.end(), std::back_inserter(_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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[[nodiscard]] nlohmann::json to_json() const override
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{
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auto json = UnaryNode::to_json();
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json["data"] = std::to_string(_offset) + "," + std::to_string(_limit);
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return json;
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}
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private:
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std::uint64_t _limit;
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std::uint64_t _offset;
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Schema _schema;
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};
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} // namespace beedb::plan::logical
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