mirror of https://gitee.com/bigwinds/arangodb
98 lines
3.4 KiB
C++
98 lines
3.4 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_SUBQUERY_BLOCK_H
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#define ARANGOD_AQL_SUBQUERY_BLOCK_H 1
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#include "Aql/ExecutionBlock.h"
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#include "Aql/ExecutionNode.h"
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#include "Utils/AqlTransaction.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 SubqueryBlock : public ExecutionBlock {
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public:
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SubqueryBlock(ExecutionEngine*, SubqueryNode const*, ExecutionBlock*);
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~SubqueryBlock();
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//////////////////////////////////////////////////////////////////////////////
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/// @brief initialize, tell dependency and the subquery
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//////////////////////////////////////////////////////////////////////////////
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int initialize() override;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief getSome
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//////////////////////////////////////////////////////////////////////////////
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AqlItemBlock* getSome(size_t atLeast, size_t atMost) override final;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief shutdown, tell dependency and the subquery
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//////////////////////////////////////////////////////////////////////////////
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int shutdown(int errorCode) override final;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief getter for the pointer to the subquery
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//////////////////////////////////////////////////////////////////////////////
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ExecutionBlock* getSubquery() { return _subquery; }
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private:
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//////////////////////////////////////////////////////////////////////////////
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/// @brief execute the subquery and return its results
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//////////////////////////////////////////////////////////////////////////////
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std::vector<AqlItemBlock*>* executeSubquery();
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//////////////////////////////////////////////////////////////////////////////
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/// @brief destroy the results of a subquery
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//////////////////////////////////////////////////////////////////////////////
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void destroySubqueryResults(std::vector<AqlItemBlock*>*);
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//////////////////////////////////////////////////////////////////////////////
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/// @brief output register
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//////////////////////////////////////////////////////////////////////////////
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RegisterId _outReg;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief we need to have an executionblock and where to write the result
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//////////////////////////////////////////////////////////////////////////////
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ExecutionBlock* _subquery;
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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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