mirror of https://gitee.com/bigwinds/arangodb
133 lines
4.2 KiB
C++
133 lines
4.2 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2019 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 Andrei Lobov
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_AQL_MATERIALIZE_EXECUTOR_H
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#define ARANGOD_AQL_MATERIALIZE_EXECUTOR_H
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#include "Aql/ExecutionBlock.h"
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#include "Aql/ExecutionBlockImpl.h"
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#include "Aql/ExecutionState.h"
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#include "Aql/ExecutorInfos.h"
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#include "Aql/OutputAqlItemRow.h"
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#include "Aql/types.h"
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#include "Indexes/IndexIterator.h"
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#include "VocBase/LocalDocumentId.h"
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#include <iosfwd>
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#include <memory>
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namespace arangodb {
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namespace aql {
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class InputAqlItemRow;
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class ExecutorInfos;
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template <BlockPassthrough>
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class SingleRowFetcher;
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class NoStats;
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class MaterializerExecutorInfos : public ExecutorInfos {
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public:
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MaterializerExecutorInfos(RegisterId nrInputRegisters, RegisterId nrOutputRegisters,
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std::unordered_set<RegisterId> registersToClear,
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std::unordered_set<RegisterId> registersToKeep,
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RegisterId inNmColPtr, RegisterId inNmDocId,
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RegisterId outDocRegId, transaction::Methods* trx);
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MaterializerExecutorInfos() = delete;
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MaterializerExecutorInfos(MaterializerExecutorInfos&&) = default;
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MaterializerExecutorInfos(MaterializerExecutorInfos const&) = delete;
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~MaterializerExecutorInfos() = default;
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inline RegisterId outputMaterializedDocumentRegId() const {
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return _outMaterializedDocumentRegId;
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}
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inline RegisterId inputNonMaterializedColRegId() const {
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return _inNonMaterializedColRegId;
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}
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inline RegisterId inputNonMaterializedDocRegId() const {
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return _inNonMaterializedDocRegId;
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}
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inline transaction::Methods* trx() const {
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return _trx;
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}
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private:
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/// @brief register to store raw collection pointer
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RegisterId const _inNonMaterializedColRegId;
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/// @brief register to store local document id
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RegisterId const _inNonMaterializedDocRegId;
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/// @brief register to store materialized document
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RegisterId const _outMaterializedDocumentRegId;
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transaction::Methods* _trx;
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};
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class MaterializeExecutor {
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public:
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struct Properties {
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static constexpr bool preservesOrder = true;
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static constexpr BlockPassthrough allowsBlockPassthrough = BlockPassthrough::Disable;
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static constexpr bool inputSizeRestrictsOutputSize = false;
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};
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using Fetcher = SingleRowFetcher<Properties::allowsBlockPassthrough>;
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using Infos = MaterializerExecutorInfos;
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using Stats = NoStats;
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MaterializeExecutor(MaterializeExecutor&&) = default;
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MaterializeExecutor(MaterializeExecutor const&) = delete;
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MaterializeExecutor(Fetcher& fetcher, Infos& infos) : _readDocumentContext(infos), _infos(infos), _fetcher(fetcher) {}
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std::pair<ExecutionState, Stats> produceRows(OutputAqlItemRow& output);
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std::tuple<ExecutionState, Stats, size_t> skipRows(size_t toSkipRequested);
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protected:
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class ReadContext {
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public:
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explicit ReadContext(Infos& infos)
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: _infos(&infos),
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_inputRow(nullptr),
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_outputRow(nullptr),
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_callback(copyDocumentCallback(*this)) {}
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ReadContext(ReadContext&&) = default;
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const Infos* _infos;
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const arangodb::aql::InputAqlItemRow* _inputRow;
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arangodb::aql::OutputAqlItemRow* _outputRow;
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arangodb::IndexIterator::DocumentCallback const _callback;
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private:
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static arangodb::IndexIterator::DocumentCallback copyDocumentCallback(ReadContext& ctx);
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};
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ReadContext _readDocumentContext;
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Infos const& _infos;
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Fetcher& _fetcher;
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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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