mirror of
https://github.com/ClickHouse/ClickHouse.git
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361 lines
13 KiB
C++
361 lines
13 KiB
C++
#pragma once
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#include <DB/Dictionaries/IDictionary.h>
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#include <DB/Dictionaries/IDictionarySource.h>
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#include <DB/Dictionaries/DictionaryStructure.h>
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#include <DB/Common/HashTable/HashMap.h>
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#include <DB/Columns/ColumnString.h>
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#include <ext/range.hpp>
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#include <atomic>
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#include <memory>
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#include <tuple>
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namespace DB
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{
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class HashedDictionary final : public IDictionary
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{
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public:
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HashedDictionary(const std::string & name, const DictionaryStructure & dict_struct,
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DictionarySourcePtr source_ptr, const DictionaryLifetime dict_lifetime, bool require_nonempty)
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: name{name}, dict_struct(dict_struct),
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source_ptr{std::move(source_ptr)}, dict_lifetime(dict_lifetime),
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require_nonempty(require_nonempty)
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{
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createAttributes();
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try
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{
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loadData();
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calculateBytesAllocated();
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}
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catch (...)
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{
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creation_exception = std::current_exception();
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}
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creation_time = std::chrono::system_clock::now();
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}
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HashedDictionary(const HashedDictionary & other)
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: HashedDictionary{other.name, other.dict_struct, other.source_ptr->clone(), other.dict_lifetime, other.require_nonempty}
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{}
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std::exception_ptr getCreationException() const override { return creation_exception; }
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std::string getName() const override { return name; }
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std::string getTypeName() const override { return "Hashed"; }
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std::size_t getBytesAllocated() const override { return bytes_allocated; }
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std::size_t getQueryCount() const override { return query_count.load(std::memory_order_relaxed); }
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double getHitRate() const override { return 1.0; }
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std::size_t getElementCount() const override { return element_count; }
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double getLoadFactor() const override { return static_cast<double>(element_count) / bucket_count; }
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bool isCached() const override { return false; }
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DictionaryPtr clone() const override { return std::make_unique<HashedDictionary>(*this); }
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const IDictionarySource * getSource() const override { return source_ptr.get(); }
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const DictionaryLifetime & getLifetime() const override { return dict_lifetime; }
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const DictionaryStructure & getStructure() const override { return dict_struct; }
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std::chrono::time_point<std::chrono::system_clock> getCreationTime() const override
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{
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return creation_time;
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}
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bool isInjective(const std::string & attribute_name) const override
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{
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return dict_struct.attributes[&getAttribute(attribute_name) - attributes.data()].injective;
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}
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bool hasHierarchy() const override { return hierarchical_attribute; }
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void toParent(const PODArray<id_t> & ids, PODArray<id_t> & out) const override
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{
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getItems<UInt64>(*hierarchical_attribute, ids, out);
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}
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#define DECLARE_MULTIPLE_GETTER(TYPE)\
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void get##TYPE(const std::string & attribute_name, const PODArray<id_t> & ids, PODArray<TYPE> & out) const override\
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{\
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const auto & attribute = getAttribute(attribute_name);\
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if (attribute.type != AttributeUnderlyingType::TYPE)\
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throw Exception{\
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name + ": type mismatch: attribute " + attribute_name + " has type " + toString(attribute.type),\
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ErrorCodes::TYPE_MISMATCH\
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};\
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\
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getItems<TYPE>(attribute, ids, out);\
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}
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DECLARE_MULTIPLE_GETTER(UInt8)
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DECLARE_MULTIPLE_GETTER(UInt16)
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DECLARE_MULTIPLE_GETTER(UInt32)
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DECLARE_MULTIPLE_GETTER(UInt64)
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DECLARE_MULTIPLE_GETTER(Int8)
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DECLARE_MULTIPLE_GETTER(Int16)
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DECLARE_MULTIPLE_GETTER(Int32)
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DECLARE_MULTIPLE_GETTER(Int64)
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DECLARE_MULTIPLE_GETTER(Float32)
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DECLARE_MULTIPLE_GETTER(Float64)
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#undef DECLARE_MULTIPLE_GETTER
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void getString(const std::string & attribute_name, const PODArray<id_t> & ids, ColumnString * out) const override
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{
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const auto & attribute = getAttribute(attribute_name);
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if (attribute.type != AttributeUnderlyingType::String)
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throw Exception{
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name + ": type mismatch: attribute " + attribute_name + " has type " + toString(attribute.type),
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ErrorCodes::TYPE_MISMATCH
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};
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const auto & attr = *std::get<std::unique_ptr<HashMap<UInt64, StringRef>>>(attribute.maps);
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const auto & null_value = std::get<String>(attribute.null_values);
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for (const auto i : ext::range(0, ids.size()))
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{
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const auto it = attr.find(ids[i]);
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const auto string_ref = it != attr.end() ? it->second : StringRef{null_value};
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out->insertData(string_ref.data, string_ref.size);
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}
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query_count.fetch_add(ids.size(), std::memory_order_relaxed);
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}
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private:
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struct attribute_t final
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{
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AttributeUnderlyingType type;
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std::tuple<UInt8, UInt16, UInt32, UInt64,
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Int8, Int16, Int32, Int64,
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Float32, Float64,
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String> null_values;
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std::tuple<std::unique_ptr<HashMap<UInt64, UInt8>>,
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std::unique_ptr<HashMap<UInt64, UInt16>>,
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std::unique_ptr<HashMap<UInt64, UInt32>>,
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std::unique_ptr<HashMap<UInt64, UInt64>>,
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std::unique_ptr<HashMap<UInt64, Int8>>,
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std::unique_ptr<HashMap<UInt64, Int16>>,
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std::unique_ptr<HashMap<UInt64, Int32>>,
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std::unique_ptr<HashMap<UInt64, Int64>>,
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std::unique_ptr<HashMap<UInt64, Float32>>,
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std::unique_ptr<HashMap<UInt64, Float64>>,
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std::unique_ptr<HashMap<UInt64, StringRef>>> maps;
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std::unique_ptr<Arena> string_arena;
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};
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void createAttributes()
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{
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const auto size = dict_struct.attributes.size();
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attributes.reserve(size);
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for (const auto & attribute : dict_struct.attributes)
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{
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attribute_index_by_name.emplace(attribute.name, attributes.size());
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attributes.push_back(createAttributeWithType(attribute.underlying_type, attribute.null_value));
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if (attribute.hierarchical)
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{
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hierarchical_attribute = &attributes.back();
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if (hierarchical_attribute->type != AttributeUnderlyingType::UInt64)
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throw Exception{
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name + ": hierarchical attribute must be UInt64.",
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ErrorCodes::TYPE_MISMATCH
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};
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}
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}
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}
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void loadData()
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{
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auto stream = source_ptr->loadAll();
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stream->readPrefix();
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while (const auto block = stream->read())
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{
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const auto & id_column = *block.getByPosition(0).column;
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element_count += id_column.size();
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for (const auto attribute_idx : ext::range(0, attributes.size()))
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{
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const auto & attribute_column = *block.getByPosition(attribute_idx + 1).column;
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auto & attribute = attributes[attribute_idx];
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for (const auto row_idx : ext::range(0, id_column.size()))
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setAttributeValue(attribute, id_column[row_idx].get<UInt64>(), attribute_column[row_idx]);
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}
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}
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stream->readSuffix();
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if (require_nonempty && 0 == element_count)
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throw Exception{
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name + ": dictionary source is empty and 'require_nonempty' property is set.",
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ErrorCodes::DICTIONARY_IS_EMPTY
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};
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}
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template <typename T>
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void addAttributeSize(const attribute_t & attribute)
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{
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const auto & map_ref = std::get<std::unique_ptr<HashMap<UInt64, T>>>(attribute.maps);
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bytes_allocated += sizeof(HashMap<UInt64, T>) + map_ref->getBufferSizeInBytes();
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bucket_count = map_ref->getBufferSizeInCells();
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}
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void calculateBytesAllocated()
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{
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bytes_allocated += attributes.size() * sizeof(attributes.front());
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for (const auto & attribute : attributes)
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{
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switch (attribute.type)
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{
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case AttributeUnderlyingType::UInt8: addAttributeSize<UInt8>(attribute); break;
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case AttributeUnderlyingType::UInt16: addAttributeSize<UInt16>(attribute); break;
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case AttributeUnderlyingType::UInt32: addAttributeSize<UInt32>(attribute); break;
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case AttributeUnderlyingType::UInt64: addAttributeSize<UInt64>(attribute); break;
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case AttributeUnderlyingType::Int8: addAttributeSize<Int8>(attribute); break;
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case AttributeUnderlyingType::Int16: addAttributeSize<Int16>(attribute); break;
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case AttributeUnderlyingType::Int32: addAttributeSize<Int32>(attribute); break;
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case AttributeUnderlyingType::Int64: addAttributeSize<Int64>(attribute); break;
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case AttributeUnderlyingType::Float32: addAttributeSize<Float32>(attribute); break;
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case AttributeUnderlyingType::Float64: addAttributeSize<Float64>(attribute); break;
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case AttributeUnderlyingType::String:
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{
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addAttributeSize<StringRef>(attribute);
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bytes_allocated += sizeof(Arena) + attribute.string_arena->size();
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break;
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}
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}
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}
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}
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template <typename T>
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void createAttributeImpl(attribute_t & attribute, const Field & null_value)
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{
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std::get<T>(attribute.null_values) = null_value.get<typename NearestFieldType<T>::Type>();
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std::get<std::unique_ptr<HashMap<UInt64, T>>>(attribute.maps) = std::make_unique<HashMap<UInt64, T>>();
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}
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attribute_t createAttributeWithType(const AttributeUnderlyingType type, const Field & null_value)
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{
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attribute_t attr{type};
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switch (type)
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{
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case AttributeUnderlyingType::UInt8: createAttributeImpl<UInt8>(attr, null_value); break;
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case AttributeUnderlyingType::UInt16: createAttributeImpl<UInt16>(attr, null_value); break;
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case AttributeUnderlyingType::UInt32: createAttributeImpl<UInt32>(attr, null_value); break;
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case AttributeUnderlyingType::UInt64: createAttributeImpl<UInt64>(attr, null_value); break;
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case AttributeUnderlyingType::Int8: createAttributeImpl<Int8>(attr, null_value); break;
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case AttributeUnderlyingType::Int16: createAttributeImpl<Int16>(attr, null_value); break;
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case AttributeUnderlyingType::Int32: createAttributeImpl<Int32>(attr, null_value); break;
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case AttributeUnderlyingType::Int64: createAttributeImpl<Int64>(attr, null_value); break;
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case AttributeUnderlyingType::Float32: createAttributeImpl<Float32>(attr, null_value); break;
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case AttributeUnderlyingType::Float64: createAttributeImpl<Float64>(attr, null_value); break;
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case AttributeUnderlyingType::String:
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{
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const auto & null_value_ref = std::get<String>(attr.null_values) = null_value.get<String>();
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std::get<std::unique_ptr<HashMap<UInt64, StringRef>>>(attr.maps) =
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std::make_unique<HashMap<UInt64, StringRef>>();
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attr.string_arena = std::make_unique<Arena>();
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break;
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}
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}
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return attr;
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}
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template <typename T>
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void getItems(const attribute_t & attribute, const PODArray<id_t> & ids, PODArray<T> & out) const
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{
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const auto & attr = *std::get<std::unique_ptr<HashMap<UInt64, T>>>(attribute.maps);
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const auto null_value = std::get<T>(attribute.null_values);
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for (const auto i : ext::range(0, ids.size()))
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{
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const auto it = attr.find(ids[i]);
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out[i] = it != attr.end() ? it->second : null_value;
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}
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query_count.fetch_add(ids.size(), std::memory_order_relaxed);
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}
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template <typename T>
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void setAttributeValueImpl(attribute_t & attribute, const id_t id, const T value)
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{
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auto & map = *std::get<std::unique_ptr<HashMap<UInt64, T>>>(attribute.maps);
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map.insert({ id, value });
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}
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void setAttributeValue(attribute_t & attribute, const id_t id, const Field & value)
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{
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switch (attribute.type)
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{
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case AttributeUnderlyingType::UInt8: setAttributeValueImpl<UInt8>(attribute, id, value.get<UInt64>()); break;
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case AttributeUnderlyingType::UInt16: setAttributeValueImpl<UInt16>(attribute, id, value.get<UInt64>()); break;
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case AttributeUnderlyingType::UInt32: setAttributeValueImpl<UInt32>(attribute, id, value.get<UInt64>()); break;
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case AttributeUnderlyingType::UInt64: setAttributeValueImpl<UInt64>(attribute, id, value.get<UInt64>()); break;
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case AttributeUnderlyingType::Int8: setAttributeValueImpl<Int8>(attribute, id, value.get<Int64>()); break;
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case AttributeUnderlyingType::Int16: setAttributeValueImpl<Int16>(attribute, id, value.get<Int64>()); break;
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case AttributeUnderlyingType::Int32: setAttributeValueImpl<Int32>(attribute, id, value.get<Int64>()); break;
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case AttributeUnderlyingType::Int64: setAttributeValueImpl<Int64>(attribute, id, value.get<Int64>()); break;
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case AttributeUnderlyingType::Float32: setAttributeValueImpl<Float32>(attribute, id, value.get<Float64>()); break;
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case AttributeUnderlyingType::Float64: setAttributeValueImpl<Float64>(attribute, id, value.get<Float64>()); break;
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case AttributeUnderlyingType::String:
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{
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auto & map = *std::get<std::unique_ptr<HashMap<UInt64, StringRef>>>(attribute.maps);
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const auto & string = value.get<String>();
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const auto string_in_arena = attribute.string_arena->insert(string.data(), string.size());
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map.insert({ id, StringRef{string_in_arena, string.size()} });
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break;
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}
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}
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}
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const attribute_t & getAttribute(const std::string & attribute_name) const
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{
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const auto it = attribute_index_by_name.find(attribute_name);
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if (it == std::end(attribute_index_by_name))
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throw Exception{
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name + ": no such attribute '" + attribute_name + "'",
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ErrorCodes::BAD_ARGUMENTS
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};
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return attributes[it->second];
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}
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const std::string name;
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const DictionaryStructure dict_struct;
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const DictionarySourcePtr source_ptr;
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const DictionaryLifetime dict_lifetime;
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const bool require_nonempty;
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std::map<std::string, std::size_t> attribute_index_by_name;
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std::vector<attribute_t> attributes;
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const attribute_t * hierarchical_attribute = nullptr;
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std::size_t bytes_allocated = 0;
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std::size_t element_count = 0;
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std::size_t bucket_count = 0;
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mutable std::atomic<std::size_t> query_count{0};
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std::chrono::time_point<std::chrono::system_clock> creation_time;
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std::exception_ptr creation_exception;
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};
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}
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