mirror of
https://github.com/ClickHouse/ClickHouse.git
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516 lines
18 KiB
C++
516 lines
18 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/Core/StringRef.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 ComplexKeyHashedDictionary final : public IDictionaryBase
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{
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public:
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ComplexKeyHashedDictionary(
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const std::string & name, const DictionaryStructure & dict_struct, DictionarySourcePtr source_ptr,
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const DictionaryLifetime dict_lifetime, bool require_nonempty)
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: name{name}, dict_struct(dict_struct), source_ptr{std::move(source_ptr)}, dict_lifetime(dict_lifetime),
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require_nonempty(require_nonempty), key_description{createKeyDescription(dict_struct)}
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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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ComplexKeyHashedDictionary(const ComplexKeyHashedDictionary & other)
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: ComplexKeyHashedDictionary{other.name, other.dict_struct, other.source_ptr->clone(), other.dict_lifetime, other.require_nonempty}
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{}
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std::string getKeyDescription() const { return key_description; };
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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 "ComplexKeyHashed"; }
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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<ComplexKeyHashedDictionary>(*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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#define DECLARE_MULTIPLE_GETTER(TYPE)\
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void get##TYPE(\
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const std::string & attribute_name, const ConstColumnPlainPtrs & key_columns, const DataTypes & key_types,\
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PODArray<TYPE> & out) const\
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{\
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validateKeyColumns(key_types);\
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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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const auto null_value = std::get<TYPE>(attribute.null_values);\
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\
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getItems<TYPE>(attribute, key_columns,\
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[&] (const std::size_t row, const auto value) { out[row] = value; },\
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[&] (const std::size_t) { return null_value; });\
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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(
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const std::string & attribute_name, const ConstColumnPlainPtrs & key_columns, const DataTypes & key_types,
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ColumnString * out) const
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{
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validateKeyColumns(key_types);
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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 & null_value = StringRef{std::get<String>(attribute.null_values)};
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getItems<StringRef>(attribute, key_columns,
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[&] (const std::size_t row, const StringRef value) { out->insertData(value.data, value.size); },
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[&] (const std::size_t) { return null_value; });
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}
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#define DECLARE_MULTIPLE_GETTER_WITH_DEFAULT(TYPE)\
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void get##TYPE(\
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const std::string & attribute_name, const ConstColumnPlainPtrs & key_columns, const DataTypes & key_types,\
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const PODArray<TYPE> & def, PODArray<TYPE> & out) const\
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{\
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validateKeyColumns(key_types);\
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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, key_columns,\
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[&] (const std::size_t row, const auto value) { out[row] = value; },\
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[&] (const std::size_t row) { return def[row]; });\
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}
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DECLARE_MULTIPLE_GETTER_WITH_DEFAULT(UInt8)
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DECLARE_MULTIPLE_GETTER_WITH_DEFAULT(UInt16)
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DECLARE_MULTIPLE_GETTER_WITH_DEFAULT(UInt32)
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DECLARE_MULTIPLE_GETTER_WITH_DEFAULT(UInt64)
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DECLARE_MULTIPLE_GETTER_WITH_DEFAULT(Int8)
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DECLARE_MULTIPLE_GETTER_WITH_DEFAULT(Int16)
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DECLARE_MULTIPLE_GETTER_WITH_DEFAULT(Int32)
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DECLARE_MULTIPLE_GETTER_WITH_DEFAULT(Int64)
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DECLARE_MULTIPLE_GETTER_WITH_DEFAULT(Float32)
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DECLARE_MULTIPLE_GETTER_WITH_DEFAULT(Float64)
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#undef DECLARE_MULTIPLE_GETTER_WITH_DEFAULT
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void getString(
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const std::string & attribute_name, const ConstColumnPlainPtrs & key_columns, const DataTypes & key_types,
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const ColumnString * const def, ColumnString * const out) const
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{
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validateKeyColumns(key_types);
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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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getItems<StringRef>(attribute, key_columns,
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[&] (const std::size_t row, const StringRef value) { out->insertData(value.data, value.size); },
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[&] (const std::size_t row) { return def->getDataAt(row); });
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}
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private:
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template <typename Value> using MapType = HashMapWithSavedHash<StringRef, Value, StringRefHash>;
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template <typename Value> using MapPointerType = std::unique_ptr<MapType<Value>>;
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struct attribute_t final
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{
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AttributeUnderlyingType type;
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std::tuple<
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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<
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MapPointerType<UInt8>, MapPointerType<UInt16>, MapPointerType<UInt32>, MapPointerType<UInt64>,
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MapPointerType<Int8>, MapPointerType<Int16>, MapPointerType<Int32>, MapPointerType<Int64>,
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MapPointerType<Float32>, MapPointerType<Float64>,
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MapPointerType<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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throw Exception{
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name + ": hierarchical attributes not supported for dictionary of type " + getTypeName(),
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ErrorCodes::TYPE_MISMATCH
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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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/// created upfront to avoid excess allocations
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const auto keys_size = dict_struct.key->size();
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StringRefs keys(keys_size);
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const auto attributes_size = attributes.size();
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while (const auto block = stream->read())
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{
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const auto rows = block.rowsInFirstColumn();
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element_count += rows;
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const auto key_column_ptrs = ext::map<ConstColumnPlainPtrs>(ext::range(0, keys_size),
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[&] (const std::size_t attribute_idx) {
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return block.getByPosition(attribute_idx).column.get();
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});
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const auto attribute_column_ptrs = ext::map<ConstColumnPlainPtrs>(ext::range(0, attributes_size),
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[&] (const std::size_t attribute_idx) {
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return block.getByPosition(keys_size + attribute_idx).column.get();
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});
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for (const auto row_idx : ext::range(0, rows))
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{
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/// calculate key once per row
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const auto key = placeKeysInPool(row_idx, key_column_ptrs, keys, keys_pool);
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auto should_rollback = false;
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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 = *attribute_column_ptrs[attribute_idx];
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auto & attribute = attributes[attribute_idx];
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const auto inserted = setAttributeValue(attribute, key, attribute_column[row_idx]);
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if (!inserted)
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should_rollback = true;
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}
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/// @note on multiple equal keys the mapped value for the first one is stored
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if (should_rollback)
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keys_pool.rollback(key.size);
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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<MapPointerType<T>>(attribute.maps);
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bytes_allocated += sizeof(MapType<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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bytes_allocated += keys_pool.size();
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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<MapPointerType<T>>(attribute.maps) = std::make_unique<MapType<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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std::get<String>(attr.null_values) = null_value.get<String>();
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std::get<MapPointerType<StringRef>>(attr.maps) = std::make_unique<MapType<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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static std::string createKeyDescription(const DictionaryStructure & dict_struct)
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{
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std::ostringstream out;
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out << '(';
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auto first = true;
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for (const auto & key : *dict_struct.key)
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{
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if (!first)
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out << ", ";
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first = false;
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out << key.type->getName();
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}
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out << ')';
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return out.str();
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}
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void validateKeyColumns(const DataTypes & key_types) const
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{
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if (key_types.size() != dict_struct.key->size())
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throw Exception{
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"Key structure does not match, expected " + key_description,
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ErrorCodes::TYPE_MISMATCH
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};
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for (const auto i : ext::range(0, key_types.size()))
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{
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const auto & expected_type = (*dict_struct.key)[i].type->getName();
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const auto & actual_type = key_types[i]->getName();
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if (expected_type != actual_type)
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throw Exception{
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"Key type at position " + std::to_string(i) + " does not match, expected " + expected_type +
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", found " + actual_type,
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ErrorCodes::TYPE_MISMATCH
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};
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}
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}
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template <typename T, typename ValueSetter, typename DefaultGetter>
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void getItems(
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const attribute_t & attribute, const ConstColumnPlainPtrs & key_columns, ValueSetter && set_value,
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DefaultGetter && get_default) const
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{
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const auto & attr = *std::get<MapPointerType<T>>(attribute.maps);
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const auto keys_size = key_columns.size();
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StringRefs keys(keys_size);
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Arena temporary_keys_pool;
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const auto rows = key_columns.front()->size();
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for (const auto i : ext::range(0, rows))
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{
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/// copy key data to arena so it is contiguous and return StringRef to it
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const auto key = placeKeysInPool(i, key_columns, keys, temporary_keys_pool);
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const auto it = attr.find(key);
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set_value(i, it != attr.end() ? it->second : get_default(i));
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/// free memory allocated for key
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temporary_keys_pool.rollback(key.size);
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}
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query_count.fetch_add(rows, std::memory_order_relaxed);
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}
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template <typename T>
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bool setAttributeValueImpl(attribute_t & attribute, const StringRef key, const T value)
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{
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auto & map = *std::get<MapPointerType<T>>(attribute.maps);
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const auto pair = map.insert({ key, value });
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return pair.second;
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}
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bool setAttributeValue(attribute_t & attribute, const StringRef key, 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: return setAttributeValueImpl<UInt8>(attribute, key, value.get<UInt64>());
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case AttributeUnderlyingType::UInt16: return setAttributeValueImpl<UInt16>(attribute, key, value.get<UInt64>());
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case AttributeUnderlyingType::UInt32: return setAttributeValueImpl<UInt32>(attribute, key, value.get<UInt64>());
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case AttributeUnderlyingType::UInt64: return setAttributeValueImpl<UInt64>(attribute, key, value.get<UInt64>());
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case AttributeUnderlyingType::Int8: return setAttributeValueImpl<Int8>(attribute, key, value.get<Int64>());
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case AttributeUnderlyingType::Int16: return setAttributeValueImpl<Int16>(attribute, key, value.get<Int64>());
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case AttributeUnderlyingType::Int32: return setAttributeValueImpl<Int32>(attribute, key, value.get<Int64>());
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case AttributeUnderlyingType::Int64: return setAttributeValueImpl<Int64>(attribute, key, value.get<Int64>());
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case AttributeUnderlyingType::Float32: return setAttributeValueImpl<Float32>(attribute, key, value.get<Float64>());
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case AttributeUnderlyingType::Float64: return setAttributeValueImpl<Float64>(attribute, key, value.get<Float64>());
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case AttributeUnderlyingType::String:
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{
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auto & map = *std::get<MapPointerType<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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const auto pair = map.insert({ key, StringRef{string_in_arena, string.size()} });
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return pair.second;
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}
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}
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return {};
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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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static StringRef placeKeysInPool(
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const std::size_t row, const ConstColumnPlainPtrs & key_columns, StringRefs & keys, Arena & pool)
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{
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const auto keys_size = key_columns.size();
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size_t sum_keys_size{};
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|
for (const auto i : ext::range(0, keys_size))
|
|
{
|
|
keys[i] = key_columns[i]->getDataAtWithTerminatingZero(row);
|
|
sum_keys_size += keys[i].size;
|
|
}
|
|
|
|
const auto res = pool.alloc(sum_keys_size);
|
|
auto place = res;
|
|
|
|
for (size_t j = 0; j < keys_size; ++j)
|
|
{
|
|
memcpy(place, keys[j].data, keys[j].size);
|
|
place += keys[j].size;
|
|
}
|
|
|
|
return { res, sum_keys_size };
|
|
}
|
|
|
|
const std::string name;
|
|
const DictionaryStructure dict_struct;
|
|
const DictionarySourcePtr source_ptr;
|
|
const DictionaryLifetime dict_lifetime;
|
|
const bool require_nonempty;
|
|
const std::string key_description;
|
|
|
|
std::map<std::string, std::size_t> attribute_index_by_name;
|
|
std::vector<attribute_t> attributes;
|
|
Arena keys_pool;
|
|
|
|
std::size_t bytes_allocated = 0;
|
|
std::size_t element_count = 0;
|
|
std::size_t bucket_count = 0;
|
|
mutable std::atomic<std::size_t> query_count{0};
|
|
|
|
std::chrono::time_point<std::chrono::system_clock> creation_time;
|
|
|
|
std::exception_ptr creation_exception;
|
|
};
|
|
|
|
|
|
}
|