ClickHouse/dbms/include/DB/Dictionaries/HashedDictionary.h

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#pragma once
#include <DB/Dictionaries/IDictionary.h>
#include <DB/Dictionaries/IDictionarySource.h>
#include <DB/Dictionaries/DictionaryStructure.h>
#include <DB/Common/HashTable/HashMap.h>
#include <DB/Columns/ColumnString.h>
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#include <ext/range.hpp>
#include <atomic>
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#include <memory>
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#include <tuple>
namespace DB
{
class HashedDictionary final : public IDictionary
{
public:
HashedDictionary(const std::string & name, const DictionaryStructure & dict_struct,
DictionarySourcePtr source_ptr, const DictionaryLifetime dict_lifetime, bool require_nonempty);
HashedDictionary(const HashedDictionary & other);
std::exception_ptr getCreationException() const override { return creation_exception; }
std::string getName() const override { return name; }
std::string getTypeName() const override { return "Hashed"; }
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); }
double getHitRate() const override { return 1.0; }
std::size_t getElementCount() const override { return element_count; }
double getLoadFactor() const override { return static_cast<double>(element_count) / bucket_count; }
bool isCached() const override { return false; }
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DictionaryPtr clone() const override { return std::make_unique<HashedDictionary>(*this); }
const IDictionarySource * getSource() const override { return source_ptr.get(); }
const DictionaryLifetime & getLifetime() const override { return dict_lifetime; }
const DictionaryStructure & getStructure() const override { return dict_struct; }
std::chrono::time_point<std::chrono::system_clock> getCreationTime() const override
{
return creation_time;
}
bool isInjective(const std::string & attribute_name) const override
{
return dict_struct.attributes[&getAttribute(attribute_name) - attributes.data()].injective;
}
bool hasHierarchy() const override { return hierarchical_attribute; }
void toParent(const PaddedPODArray<id_t> & ids, PaddedPODArray<id_t> & out) const override;
#define DECLARE(TYPE)\
void get##TYPE(const std::string & attribute_name, const PaddedPODArray<id_t> & ids, PaddedPODArray<TYPE> & out) const;
DECLARE(UInt8)
DECLARE(UInt16)
DECLARE(UInt32)
DECLARE(UInt64)
DECLARE(Int8)
DECLARE(Int16)
DECLARE(Int32)
DECLARE(Int64)
DECLARE(Float32)
DECLARE(Float64)
#undef DECLARE
void getString(const std::string & attribute_name, const PaddedPODArray<id_t> & ids, ColumnString * out) const;
#define DECLARE(TYPE)\
void get##TYPE(\
const std::string & attribute_name, const PaddedPODArray<id_t> & ids, const PaddedPODArray<TYPE> & def,\
PaddedPODArray<TYPE> & out) const;
DECLARE(UInt8)
DECLARE(UInt16)
DECLARE(UInt32)
DECLARE(UInt64)
DECLARE(Int8)
DECLARE(Int16)
DECLARE(Int32)
DECLARE(Int64)
DECLARE(Float32)
DECLARE(Float64)
#undef DECLARE
void getString(
const std::string & attribute_name, const PaddedPODArray<id_t> & ids, const ColumnString * const def,
ColumnString * const out) const;
#define DECLARE(TYPE)\
void get##TYPE(\
const std::string & attribute_name, const PaddedPODArray<id_t> & ids, const TYPE & def, PaddedPODArray<TYPE> & out) const;
DECLARE(UInt8)
DECLARE(UInt16)
DECLARE(UInt32)
DECLARE(UInt64)
DECLARE(Int8)
DECLARE(Int16)
DECLARE(Int32)
DECLARE(Int64)
DECLARE(Float32)
DECLARE(Float64)
#undef DECLARE
void getString(
const std::string & attribute_name, const PaddedPODArray<id_t> & ids, const String & def,
ColumnString * const out) const;
void has(const PaddedPODArray<id_t> & ids, PaddedPODArray<UInt8> & out) const override;
private:
template <typename Value> using CollectionType = HashMap<UInt64, Value>;
template <typename Value> using CollectionPtrType = std::unique_ptr<CollectionType<Value>>;
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struct attribute_t final
{
AttributeUnderlyingType type;
std::tuple<
UInt8, UInt16, UInt32, UInt64,
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Int8, Int16, Int32, Int64,
Float32, Float64,
String> null_values;
std::tuple<
CollectionPtrType<UInt8>, CollectionPtrType<UInt16>, CollectionPtrType<UInt32>, CollectionPtrType<UInt64>,
CollectionPtrType<Int8>, CollectionPtrType<Int16>, CollectionPtrType<Int32>, CollectionPtrType<Int64>,
CollectionPtrType<Float32>, CollectionPtrType<Float64>,
CollectionPtrType<StringRef>> maps;
std::unique_ptr<Arena> string_arena;
};
void createAttributes();
void loadData();
template <typename T>
void addAttributeSize(const attribute_t & attribute);
void calculateBytesAllocated();
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template <typename T>
void createAttributeImpl(attribute_t & attribute, const Field & null_value);
attribute_t createAttributeWithType(const AttributeUnderlyingType type, const Field & null_value);
template <typename OutputType, typename ValueSetter, typename DefaultGetter>
void getItemsNumber(
const attribute_t & attribute,
const PaddedPODArray<id_t> & ids,
ValueSetter && set_value,
DefaultGetter && get_default) const;
template <typename AttributeType, typename OutputType, typename ValueSetter, typename DefaultGetter>
void getItemsImpl(
const attribute_t & attribute,
const PaddedPODArray<id_t> & ids,
ValueSetter && set_value,
DefaultGetter && get_default) const;
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template <typename T>
void setAttributeValueImpl(attribute_t & attribute, const id_t id, const T value);
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void setAttributeValue(attribute_t & attribute, const id_t id, const Field & value);
const attribute_t & getAttribute(const std::string & attribute_name) const;
template <typename T>
void has(const attribute_t & attribute, const PaddedPODArray<id_t> & ids, PaddedPODArray<UInt8> & out) const;
const std::string name;
const DictionaryStructure dict_struct;
const DictionarySourcePtr source_ptr;
const DictionaryLifetime dict_lifetime;
const bool require_nonempty;
std::map<std::string, std::size_t> attribute_index_by_name;
std::vector<attribute_t> attributes;
const attribute_t * hierarchical_attribute = nullptr;
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;
};
}