mirror of https://gitee.com/bigwinds/arangodb
112 lines
2.8 KiB
C++
112 lines
2.8 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2018 ArangoDB GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Michael Hackstein
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_AQL_AQL_ITEM_MATRIX_H
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#define ARANGOD_AQL_AQL_ITEM_MATRIX_H 1
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#include "Aql/ShadowAqlItemRow.h"
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#include <cstdint>
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#include <utility>
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#include <vector>
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namespace arangodb {
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namespace aql {
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class InputAqlItemRow;
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class SharedAqlItemBlockPtr;
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/**
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* @brief A Matrix of AqlItemRows
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*/
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class AqlItemMatrix {
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public:
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// uint32_t in this vector is a reasonable trade-off between performance and amount of data.
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// With this values we can sort up to ~ 4.000.000.000 times 1000 elements in memory.
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// Anything beyond that has a questionable runtime on nowadays hardware anyways.
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using RowIndex = std::pair<uint32_t, uint32_t>;
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explicit AqlItemMatrix(RegisterId nrRegs);
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~AqlItemMatrix() = default;
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/**
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* @brief Add this block of rows into the Matrix
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*
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* @param blockPtr Block of rows to append in the matrix
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*/
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void addBlock(SharedAqlItemBlockPtr blockPtr);
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/**
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* @brief Get the number of rows stored in this Matrix
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*
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* @return Number of Rows
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*/
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uint64_t size() const noexcept;
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/**
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* @brief Number of registers, i.e. width of the matrix.
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*/
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RegisterId getNrRegisters() const noexcept;
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/**
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* @brief Test if this matrix is empty
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*
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* @return True if empty
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*/
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bool empty() const noexcept;
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std::vector<RowIndex> produceRowIndexes() const;
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/**
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* @brief Get the AqlItemRow at the given index
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*
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* @param index The index of the Row to read inside the matrix
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*
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* @return A single row in the Matrix
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*/
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InputAqlItemRow getRow(RowIndex index) const noexcept;
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size_t numberOfBlocks() const noexcept;
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SharedAqlItemBlockPtr getBlock(size_t index) const noexcept;
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bool stoppedOnShadowRow() const noexcept;
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ShadowAqlItemRow popShadowRow();
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ShadowAqlItemRow peekShadowRow() const;
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private:
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std::vector<SharedAqlItemBlockPtr> _blocks;
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uint64_t _size;
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RegisterId _nrRegs;
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size_t _lastShadowRow;
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};
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} // namespace aql
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} // namespace arangodb
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#endif
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