mirror of https://gitee.com/bigwinds/arangodb
86 lines
2.8 KiB
C++
86 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 Tobias Goedderz
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/// @author Michael Hackstein
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/// @author Heiko Kernbach
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/// @author Jan Christoph Uhde
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_AQL_EMPTY_TEST_EXECUTOR_H
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#define ARANGOD_AQL_EMPTY_TEST_EXECUTOR_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/Stats.h"
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#include "Aql/types.h"
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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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template <BlockPassthrough>
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class SingleRowFetcher;
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class TestEmptyExecutorHelperInfos : public ExecutorInfos {
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public:
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TestEmptyExecutorHelperInfos(RegisterId inputRegister, RegisterId nrInputRegisters,
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RegisterId nrOutputRegisters,
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std::unordered_set<RegisterId> registersToClear,
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std::unordered_set<RegisterId> registersToKeep);
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TestEmptyExecutorHelperInfos() = delete;
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TestEmptyExecutorHelperInfos(TestEmptyExecutorHelperInfos&&) = default;
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TestEmptyExecutorHelperInfos(TestEmptyExecutorHelperInfos const&) = delete;
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~TestEmptyExecutorHelperInfos() = default;
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};
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class TestEmptyExecutorHelper {
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public:
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struct Properties {
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static const bool preservesOrder = true;
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static const BlockPassthrough allowsBlockPassthrough = BlockPassthrough::Disable;
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static const bool inputSizeRestrictsOutputSize = false;
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};
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using Fetcher = SingleRowFetcher<Properties::allowsBlockPassthrough>;
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using Infos = ExecutorInfos;
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using Stats = FilterStats;
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TestEmptyExecutorHelper() = delete;
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TestEmptyExecutorHelper(TestEmptyExecutorHelper&&) = default;
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TestEmptyExecutorHelper(TestEmptyExecutorHelper const&) = delete;
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TestEmptyExecutorHelper(Fetcher&, Infos&);
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~TestEmptyExecutorHelper();
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/**
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* @brief produce the next Row of Aql Values.
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*
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* @return ExecutionState, and if successful exactly one new Row of AqlItems.
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*/
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std::pair<ExecutionState, Stats> produceRows(OutputAqlItemRow& output);
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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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