ClickHouse/dbms/include/DB/Dictionaries/RangeHashedDictionary.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>
#include <memory>
#include <tuple>
namespace DB
{
class RangeHashedDictionary final : public IDictionaryBase
{
public:
RangeHashedDictionary(
const std::string & name, const DictionaryStructure & dict_struct, DictionarySourcePtr source_ptr,
const DictionaryLifetime dict_lifetime, bool require_nonempty);
RangeHashedDictionary(const RangeHashedDictionary & other);
std::exception_ptr getCreationException() const override { return creation_exception; }
std::string getName() const override { return name; }
std::string getTypeName() const override { return "RangeHashed"; }
std::size_t getBytesAllocated() const override { return bytes_allocated; }
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; }
DictionaryPtr clone() const override { return std::make_unique<RangeHashedDictionary>(*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;
}
#define DECLARE_MULTIPLE_GETTER(TYPE)\
void get##TYPE(\
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const std::string & attribute_name, const PaddedPODArray<Key> & ids, const PaddedPODArray<UInt16> & dates,\
PaddedPODArray<TYPE> & out) const;
DECLARE_MULTIPLE_GETTER(UInt8)
DECLARE_MULTIPLE_GETTER(UInt16)
DECLARE_MULTIPLE_GETTER(UInt32)
DECLARE_MULTIPLE_GETTER(UInt64)
DECLARE_MULTIPLE_GETTER(Int8)
DECLARE_MULTIPLE_GETTER(Int16)
DECLARE_MULTIPLE_GETTER(Int32)
DECLARE_MULTIPLE_GETTER(Int64)
DECLARE_MULTIPLE_GETTER(Float32)
DECLARE_MULTIPLE_GETTER(Float64)
#undef DECLARE_MULTIPLE_GETTER
void getString(
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const std::string & attribute_name, const PaddedPODArray<Key> & ids, const PaddedPODArray<UInt16> & dates,
ColumnString * out) const;
private:
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struct Range : std::pair<UInt16, UInt16>
{
using std::pair<UInt16, UInt16>::pair;
bool contains(const UInt16 date) const
{
const auto & left = first;
const auto & right = second;
if (left <= date && date <= right)
return true;
const auto has_left_bound = 0 < left && left <= DATE_LUT_MAX_DAY_NUM;
const auto has_right_bound = 0 < right && right <= DATE_LUT_MAX_DAY_NUM;
if ((!has_left_bound || left <= date) && (!has_right_bound || date <= right))
return true;
return false;
}
};
template <typename T>
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struct Value final
{
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Range range;
T value;
};
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template <typename T> using Values = std::vector<Value<T>>;
template <typename T> using Collection = HashMap<UInt64, Values<T>>;
template <typename T> using Ptr = std::unique_ptr<Collection<T>>;
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struct Attribute final
{
public:
AttributeUnderlyingType type;
std::tuple<UInt8, UInt16, UInt32, UInt64,
Int8, Int16, Int32, Int64,
Float32, Float64,
String> null_values;
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std::tuple<Ptr<UInt8>, Ptr<UInt16>, Ptr<UInt32>, Ptr<UInt64>,
Ptr<Int8>, Ptr<Int16>, Ptr<Int32>, Ptr<Int64>,
Ptr<Float32>, Ptr<Float64>, Ptr<StringRef>> maps;
std::unique_ptr<Arena> string_arena;
};
void createAttributes();
void loadData();
template <typename T>
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void addAttributeSize(const Attribute & attribute);
void calculateBytesAllocated();
template <typename T>
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void createAttributeImpl(Attribute & attribute, const Field & null_value);
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Attribute createAttributeWithType(const AttributeUnderlyingType type, const Field & null_value);
template <typename OutputType>
void getItems(
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const Attribute & attribute,
const PaddedPODArray<Key> & ids,
const PaddedPODArray<UInt16> & dates,
PaddedPODArray<OutputType> & out) const;
template <typename AttributeType, typename OutputType>
void getItemsImpl(
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const Attribute & attribute,
const PaddedPODArray<Key> & ids,
const PaddedPODArray<UInt16> & dates,
PaddedPODArray<OutputType> & out) const;
template <typename T>
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void setAttributeValueImpl(Attribute & attribute, const Key id, const Range & range, const T value);
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void setAttributeValue(Attribute & attribute, const Key id, const Range & range, const Field & value);
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const Attribute & getAttribute(const std::string & attribute_name) const;
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const Attribute & getAttributeWithType(const std::string & name, const AttributeUnderlyingType type) 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;
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std::vector<Attribute> attributes;
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;
};
}