mirror of https://gitee.com/bigwinds/arangodb
87 lines
2.4 KiB
C++
87 lines
2.4 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS 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 Max Neunhoeffer
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_AQL_SORT_BLOCK_H
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#define ARANGOD_AQL_SORT_BLOCK_H 1
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#include "Basics/Common.h"
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#include "Aql/ExecutionBlock.h"
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#include "Aql/SortNode.h"
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namespace arangodb {
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class TransactionMethods;
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namespace aql {
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class AqlItemBlock;
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class ExecutionEngine;
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class SortBlock final : public ExecutionBlock {
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public:
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SortBlock(ExecutionEngine*, SortNode const*);
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~SortBlock();
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int initializeCursor(AqlItemBlock* items, size_t pos) override final;
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int getOrSkipSome(size_t atLeast, size_t atMost, bool skipping, AqlItemBlock*&, size_t& skipped) override final;
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/// @brief dosorting
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private:
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void doSorting();
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/// @brief OurLessThan
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class OurLessThan {
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public:
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OurLessThan(TransactionMethods* trx,
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std::deque<AqlItemBlock*>& buffer,
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std::vector<std::pair<RegisterId, bool>>& sortRegisters)
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: _trx(trx),
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_buffer(buffer),
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_sortRegisters(sortRegisters) {}
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bool operator()(std::pair<size_t, size_t> const& a,
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std::pair<size_t, size_t> const& b) const;
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private:
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TransactionMethods* _trx;
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std::deque<AqlItemBlock*>& _buffer;
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std::vector<std::pair<RegisterId, bool>>& _sortRegisters;
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};
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/// @brief pairs, consisting of variable and sort direction
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/// (true = ascending | false = descending)
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std::vector<std::pair<RegisterId, bool>> _sortRegisters;
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/// @brief whether or not the sort should be stable
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bool _stable;
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bool _mustFetchAll;
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};
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} // namespace arangodb::aql
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} // namespace arangodb
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#endif
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