mirror of https://gitee.com/bigwinds/arangodb
70 lines
2.0 KiB
C++
70 lines
2.0 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 "Aql/ExecutionBlock.h"
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#include "Aql/SortNode.h"
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#include "Aql/SortRegister.h"
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#include "Basics/Common.h"
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namespace arangodb {
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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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/// @brief initializeCursor, could be called multiple times
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std::pair<ExecutionState, Result> initializeCursor(AqlItemBlock* items, size_t pos) override;
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std::pair<ExecutionState, Result> getOrSkipSome(size_t atMost, bool skipping,
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AqlItemBlock*&,
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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 pairs, consisting of variable and sort direction
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/// (true = ascending | false = descending)
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std::vector<SortRegister> _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 aql
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} // namespace arangodb
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#endif
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