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https://github.com/ClickHouse/ClickHouse.git
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329 lines
9.0 KiB
C++
329 lines
9.0 KiB
C++
#pragma once
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#include <Common/HashTable/SmallTable.h>
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#include <Common/HashTable/HashSet.h>
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#include <Common/HyperLogLogCounter.h>
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#include <Core/Defines.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int LOGICAL_ERROR;
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}
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namespace details
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{
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enum class ContainerType : uint8_t { SMALL = 1, MEDIUM = 2, LARGE = 3 };
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static inline ContainerType max(const ContainerType & lhs, const ContainerType & rhs)
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{
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uint8_t res = std::max(static_cast<uint8_t>(lhs), static_cast<uint8_t>(rhs));
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return static_cast<ContainerType>(res);
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}
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}
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/** For a small number of keys - an array of fixed size "on the stack".
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* For the average, HashSet is allocated.
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* For large, HyperLogLog is allocated.
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*/
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template
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<
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typename Key,
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typename HashContainer,
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UInt8 small_set_size_max,
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UInt8 medium_set_power2_max,
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UInt8 K,
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typename Hash = IntHash32<Key>,
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typename HashValueType = UInt32,
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typename BiasEstimator = TrivialBiasEstimator,
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HyperLogLogMode mode = HyperLogLogMode::FullFeatured,
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typename DenominatorType = double
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>
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class CombinedCardinalityEstimator
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{
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public:
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using Self = CombinedCardinalityEstimator
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<
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Key,
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HashContainer,
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small_set_size_max,
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medium_set_power2_max,
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K,
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Hash,
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HashValueType,
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BiasEstimator,
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mode,
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DenominatorType
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>;
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using value_type = Key;
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private:
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using Small = SmallSet<Key, small_set_size_max>;
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using Medium = HashContainer;
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using Large = HyperLogLogCounter<K, Hash, HashValueType, DenominatorType, BiasEstimator, mode>;
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public:
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CombinedCardinalityEstimator()
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{
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setContainerType(details::ContainerType::SMALL);
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}
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~CombinedCardinalityEstimator()
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{
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destroy();
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}
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void insert(Key value)
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{
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auto container_type = getContainerType();
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if (container_type == details::ContainerType::SMALL)
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{
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if (small.find(value) == small.end())
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{
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if (!small.full())
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small.insert(value);
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else
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{
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toMedium();
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getContainer<Medium>().insert(value);
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}
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}
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}
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else if (container_type == details::ContainerType::MEDIUM)
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{
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auto & container = getContainer<Medium>();
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if (container.size() < medium_set_size_max)
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container.insert(value);
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else
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{
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toLarge();
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getContainer<Large>().insert(value);
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}
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}
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else if (container_type == details::ContainerType::LARGE)
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getContainer<Large>().insert(value);
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}
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UInt64 size() const
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{
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auto container_type = getContainerType();
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if (container_type == details::ContainerType::SMALL)
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return small.size();
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else if (container_type == details::ContainerType::MEDIUM)
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return getContainer<Medium>().size();
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else if (container_type == details::ContainerType::LARGE)
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return getContainer<Large>().size();
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else
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throw Poco::Exception("Internal error", ErrorCodes::LOGICAL_ERROR);
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}
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void merge(const Self & rhs)
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{
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auto container_type = getContainerType();
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auto max_container_type = details::max(container_type, rhs.getContainerType());
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if (container_type != max_container_type)
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{
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if (max_container_type == details::ContainerType::MEDIUM)
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toMedium();
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else if (max_container_type == details::ContainerType::LARGE)
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toLarge();
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}
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if (rhs.getContainerType() == details::ContainerType::SMALL)
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{
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for (const auto & x : rhs.small)
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insert(x.getValue());
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}
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else if (rhs.getContainerType() == details::ContainerType::MEDIUM)
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{
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for (const auto & x : rhs.getContainer<Medium>())
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insert(x.getValue());
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}
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else if (rhs.getContainerType() == details::ContainerType::LARGE)
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getContainer<Large>().merge(rhs.getContainer<Large>());
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}
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/// You can only call for an empty object.
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void read(DB::ReadBuffer & in)
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{
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UInt8 v;
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readBinary(v, in);
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auto container_type = static_cast<details::ContainerType>(v);
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if (container_type == details::ContainerType::SMALL)
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small.read(in);
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else if (container_type == details::ContainerType::MEDIUM)
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{
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toMedium();
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getContainer<Medium>().read(in);
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}
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else if (container_type == details::ContainerType::LARGE)
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{
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toLarge();
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getContainer<Large>().read(in);
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}
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}
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void readAndMerge(DB::ReadBuffer & in)
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{
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auto container_type = getContainerType();
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/// If readAndMerge is called with an empty state, just deserialize
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/// the state is specified as a parameter.
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if ((container_type == details::ContainerType::SMALL) && small.empty())
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{
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read(in);
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return;
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}
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UInt8 v;
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readBinary(v, in);
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auto rhs_container_type = static_cast<details::ContainerType>(v);
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auto max_container_type = details::max(container_type, rhs_container_type);
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if (container_type != max_container_type)
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{
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if (max_container_type == details::ContainerType::MEDIUM)
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toMedium();
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else if (max_container_type == details::ContainerType::LARGE)
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toLarge();
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}
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if (rhs_container_type == details::ContainerType::SMALL)
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{
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typename Small::Reader reader(in);
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while (reader.next())
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insert(reader.get());
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}
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else if (rhs_container_type == details::ContainerType::MEDIUM)
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{
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typename Medium::Reader reader(in);
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while (reader.next())
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insert(reader.get());
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}
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else if (rhs_container_type == details::ContainerType::LARGE)
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getContainer<Large>().readAndMerge(in);
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}
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void write(DB::WriteBuffer & out) const
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{
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auto container_type = getContainerType();
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writeBinary(static_cast<UInt8>(container_type), out);
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if (container_type == details::ContainerType::SMALL)
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small.write(out);
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else if (container_type == details::ContainerType::MEDIUM)
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getContainer<Medium>().write(out);
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else if (container_type == details::ContainerType::LARGE)
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getContainer<Large>().write(out);
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}
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private:
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void toMedium()
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{
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if (getContainerType() != details::ContainerType::SMALL)
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throw Poco::Exception("Internal error", ErrorCodes::LOGICAL_ERROR);
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auto tmp_medium = std::make_unique<Medium>();
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for (const auto & x : small)
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tmp_medium->insert(x.getValue());
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medium = tmp_medium.release();
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setContainerType(details::ContainerType::MEDIUM);
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}
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void toLarge()
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{
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auto container_type = getContainerType();
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if ((container_type != details::ContainerType::SMALL) && (container_type != details::ContainerType::MEDIUM))
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throw Poco::Exception("Internal error", ErrorCodes::LOGICAL_ERROR);
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auto tmp_large = std::make_unique<Large>();
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if (container_type == details::ContainerType::SMALL)
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{
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for (const auto & x : small)
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tmp_large->insert(x.getValue());
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}
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else if (container_type == details::ContainerType::MEDIUM)
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{
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for (const auto & x : getContainer<Medium>())
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tmp_large->insert(x.getValue());
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destroy();
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}
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large = tmp_large.release();
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setContainerType(details::ContainerType::LARGE);
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}
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void NO_INLINE destroy()
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{
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auto container_type = getContainerType();
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clearContainerType();
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if (container_type == details::ContainerType::MEDIUM)
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{
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delete medium;
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medium = nullptr;
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}
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else if (container_type == details::ContainerType::LARGE)
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{
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delete large;
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large = nullptr;
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}
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}
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template <typename T>
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inline T & getContainer()
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{
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return *reinterpret_cast<T *>(address & mask);
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}
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template <typename T>
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inline const T & getContainer() const
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{
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return *reinterpret_cast<T *>(address & mask);
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}
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void setContainerType(details::ContainerType t)
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{
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address &= mask;
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address |= static_cast<UInt8>(t);
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}
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inline details::ContainerType getContainerType() const
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{
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return static_cast<details::ContainerType>(address & ~mask);
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}
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void clearContainerType()
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{
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address &= mask;
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}
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Small small;
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union
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{
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Medium * medium;
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Large * large;
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UInt64 address = 0;
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};
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static const UInt64 mask = 0xFFFFFFFFFFFFFFFC;
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static const UInt32 medium_set_size_max = 1ULL << medium_set_power2_max;
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};
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}
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