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#pragma once
#include <atomic>
#include <variant>
#include <vector>
#include <optional>
#include <Common/HashTable/HashSet.h>
#include <Common/Arena.h>
#include <DataTypes/IDataType.h>
#include <Core/Block.h>
#include "DictionaryStructure.h"
#include "IDictionary.h"
#include "IDictionarySource.h"
#include "DictionaryHelpers.h"
namespace DB
{
class FlatDictionary final : public IDictionary
{
public:
struct Configuration
{
size_t initial_array_size;
size_t max_array_size;
bool require_nonempty;
DictionaryLifetime dict_lifetime;
};
FlatDictionary(
const StorageID & dict_id_,
const DictionaryStructure & dict_struct_,
DictionarySourcePtr source_ptr_,
Configuration configuration_,
BlockPtr update_field_loaded_block_ = nullptr);
std::string getTypeName() const override { return "Flat"; }
size_t getBytesAllocated() const override { return bytes_allocated; }
size_t getQueryCount() const override { return query_count.load(std::memory_order_relaxed); }
double getFoundRate() const override
{
size_t queries = query_count.load(std::memory_order_relaxed);
if (!queries)
return 0;
return static_cast<double>(found_count.load(std::memory_order_relaxed)) / queries;
}
double getHitRate() const override { return 1.0; }
size_t getElementCount() const override { return element_count; }
double getLoadFactor() const override { return static_cast<double>(element_count) / bucket_count; }
std::shared_ptr<const IExternalLoadable> clone() const override
{
return std::make_shared<FlatDictionary>(getDictionaryID(), dict_struct, source_ptr->clone(), configuration, update_field_loaded_block);
}
DictionarySourcePtr getSource() const override { return source_ptr; }
const DictionaryLifetime & getLifetime() const override { return configuration.dict_lifetime; }
const DictionaryStructure & getStructure() const override { return dict_struct; }
bool isInjective(const std::string & attribute_name) const override
{
return dict_struct.getAttribute(attribute_name).injective;
}
DictionaryKeyType getKeyType() const override { return DictionaryKeyType::Simple; }
ColumnPtr getColumn(
const std::string& attribute_name,
const DataTypePtr & result_type,
const Columns & key_columns,
const DataTypes & key_types,
const ColumnPtr & default_values_column) const override;
ColumnUInt8::Ptr hasKeys(const Columns & key_columns, const DataTypes & key_types) const override;
bool hasHierarchy() const override { return dict_struct.hierarchical_attribute_index.has_value(); }
ColumnPtr getHierarchy(ColumnPtr key_column, const DataTypePtr & key_type) const override;
ColumnUInt8::Ptr isInHierarchy(
ColumnPtr key_column,
ColumnPtr in_key_column,
const DataTypePtr & key_type) const override;
DictionaryHierarchicalParentToChildIndexPtr getHierarchicalIndex() const override;
size_t getHierarchicalIndexBytesAllocated() const override { return hierarchical_index_bytes_allocated; }
ColumnPtr getDescendants(
ColumnPtr key_column,
const DataTypePtr & key_type,
size_t level,
DictionaryHierarchicalParentToChildIndexPtr parent_to_child_index) const override;
Pipe read(const Names & column_names, size_t max_block_size, size_t num_streams) const override;
private:
template <typename Value>
using ContainerType = std::conditional_t<std::is_same_v<Value, Array>, std::vector<Value>, PaddedPODArray<Value>>;
using NullableSet = HashSet<UInt64, DefaultHash<UInt64>>;
struct Attribute final
{
AttributeUnderlyingType type;
std::optional<NullableSet> is_nullable_set;
std::variant<
ContainerType<UInt8>,
ContainerType<UInt16>,
ContainerType<UInt32>,
ContainerType<UInt64>,
ContainerType<UInt128>,
ContainerType<UInt256>,
ContainerType<Int8>,
ContainerType<Int16>,
ContainerType<Int32>,
ContainerType<Int64>,
ContainerType<Int128>,
ContainerType<Int256>,
ContainerType<Decimal32>,
ContainerType<Decimal64>,
ContainerType<Decimal128>,
ContainerType<Decimal256>,
ContainerType<DateTime64>,
ContainerType<Float32>,
ContainerType<Float64>,
ContainerType<UUID>,
ContainerType<IPv4>,
ContainerType<IPv6>,
ContainerType<StringRef>,
ContainerType<Array>>
container;
};
void createAttributes();
void blockToAttributes(const Block & block);
void updateData();
void loadData();
void buildHierarchyParentToChildIndexIfNeeded();
void calculateBytesAllocated();
Attribute createAttribute(const DictionaryAttribute & attribute);
template <typename AttributeType, bool is_nullable, typename ValueSetter, typename DefaultValueExtractor>
void getItemsImpl(
const Attribute & attribute,
const PaddedPODArray<UInt64> & keys,
ValueSetter && set_value,
DefaultValueExtractor & default_value_extractor) const;
template <typename T>
void resize(Attribute & attribute, UInt64 key);
void setAttributeValue(Attribute & attribute, UInt64 key, const Field & value);
const DictionaryStructure dict_struct;
const DictionarySourcePtr source_ptr;
const Configuration configuration;
std::vector<Attribute> attributes;
std::vector<bool> loaded_keys;
size_t bytes_allocated = 0;
size_t hierarchical_index_bytes_allocated = 0;
size_t element_count = 0;
size_t bucket_count = 0;
mutable std::atomic<size_t> query_count{0};
mutable std::atomic<size_t> found_count{0};
BlockPtr update_field_loaded_block;
Arena string_arena;
DictionaryHierarchicalParentToChildIndexPtr hierarhical_index;
};
}
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