mirror of https://gitee.com/bigwinds/arangodb
112 lines
3.9 KiB
C++
112 lines
3.9 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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#include "CountCollectExecutor.h"
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#include "Aql/AqlValue.h"
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#include "Aql/ExecutorInfos.h"
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#include "Aql/InputAqlItemRow.h"
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#include "Aql/OutputAqlItemRow.h"
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#include "Aql/SingleRowFetcher.h"
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#include "Aql/Stats.h"
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#include <utility>
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using namespace arangodb;
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using namespace arangodb::aql;
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constexpr bool CountCollectExecutor::Properties::preservesOrder;
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constexpr BlockPassthrough CountCollectExecutor::Properties::allowsBlockPassthrough;
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constexpr bool CountCollectExecutor::Properties::inputSizeRestrictsOutputSize;
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CountCollectExecutorInfos::CountCollectExecutorInfos(
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RegisterId collectRegister, RegisterId nrInputRegisters, RegisterId nrOutputRegisters,
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// cppcheck-suppress passedByValue
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std::unordered_set<RegisterId> registersToClear,
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// cppcheck-suppress passedByValue
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std::unordered_set<RegisterId> registersToKeep)
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: ExecutorInfos(std::make_shared<std::unordered_set<RegisterId>>(),
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make_shared_unordered_set({collectRegister}),
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nrInputRegisters, nrOutputRegisters,
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std::move(registersToClear), std::move(registersToKeep)),
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_collectRegister(collectRegister) {}
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RegisterId CountCollectExecutorInfos::getOutputRegisterId() const {
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return _collectRegister;
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}
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CountCollectExecutor::CountCollectExecutor(Fetcher& fetcher, Infos& infos)
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: _infos(infos), _fetcher(fetcher), _state(ExecutionState::HASMORE), _count(0) {}
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std::pair<ExecutionState, NoStats> CountCollectExecutor::produceRows(OutputAqlItemRow& output) {
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TRI_IF_FAILURE("CountCollectExecutor::produceRows") {
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THROW_ARANGO_EXCEPTION(TRI_ERROR_DEBUG);
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}
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if (_state == ExecutionState::DONE) {
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return {_state, NoStats{}};
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}
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while (_state != ExecutionState::DONE) {
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size_t skipped;
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std::tie(_state, skipped) = _fetcher.skipRows(ExecutionBlock::SkipAllSize());
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if (_state == ExecutionState::WAITING) {
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TRI_ASSERT(skipped == 0);
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return {_state, NoStats{}};
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}
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TRI_ASSERT(skipped != 0 || _state == ExecutionState::DONE);
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incrCountBy(skipped);
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}
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// In general, we do not have an input row. In fact, we never fetch one.
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output.setAllowSourceRowUninitialized();
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// We must produce exactly one output row.
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output.cloneValueInto(_infos.getOutputRegisterId(),
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InputAqlItemRow{CreateInvalidInputRowHint{}},
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AqlValue(AqlValueHintUInt(getCount())));
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return {_state, NoStats{}};
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}
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void CountCollectExecutor::incrCountBy(size_t incr) noexcept { _count += incr; }
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uint64_t CountCollectExecutor::getCount() noexcept { return _count; }
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std::pair<ExecutionState, size_t> CountCollectExecutor::expectedNumberOfRows(size_t) const {
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if (_state == ExecutionState::DONE) {
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return {ExecutionState::DONE, 0};
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}
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return {ExecutionState::HASMORE, 1};
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}
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const CountCollectExecutor::Infos& CountCollectExecutor::infos() const noexcept {
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return _infos;
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}
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CountCollectExecutor::~CountCollectExecutor() = default;
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