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#pragma once
#include <atomic>
#include <memory>
#include <variant>
#include <optional>
#include <Common/HashTable/HashMap.h>
#include <Common/HashTable/HashSet.h>
#include <Core/Block.h>
#include <Dictionaries/DictionaryStructure.h>
#include <Dictionaries/IDictionary.h>
#include <Dictionaries/IDictionarySource.h>
#include <Dictionaries/DictionaryHelpers.h>
/** This dictionary stores all attributes in arrays.
* Key is stored in hash table and value is index into attribute array.
*/
namespace DB
{
struct HashedArrayDictionaryStorageConfiguration
{
const bool require_nonempty;
const DictionaryLifetime lifetime;
};
template <DictionaryKeyType dictionary_key_type>
class HashedArrayDictionary final : public IDictionary
{
public:
using KeyType = std::conditional_t<dictionary_key_type == DictionaryKeyType::Simple, UInt64, StringRef>;
HashedArrayDictionary(
const StorageID & dict_id_,
const DictionaryStructure & dict_struct_,
DictionarySourcePtr source_ptr_,
const HashedArrayDictionaryStorageConfiguration & configuration_,
BlockPtr update_field_loaded_block_ = nullptr);
std::string getTypeName() const override
{
if constexpr (dictionary_key_type == DictionaryKeyType::Simple)
return "HashedArray";
else
return "ComplexHashedArray";
}
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<HashedArrayDictionary<dictionary_key_type>>(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.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 dictionary_key_type; }
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;
Columns getColumns(
const Strings & attribute_names,
const DataTypes & result_types,
const Columns & key_columns,
const DataTypes & key_types,
const Columns & default_values_columns) const override;
ColumnUInt8::Ptr hasKeys(const Columns & key_columns, const DataTypes & key_types) const override;
bool hasHierarchy() const override { return dictionary_key_type == DictionaryKeyType::Simple && dict_struct.hierarchical_attribute_index.has_value(); }
ColumnPtr getHierarchy(ColumnPtr key_column, const DataTypePtr & hierarchy_attribute_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:
using KeyContainerType = std::conditional_t<
dictionary_key_type == DictionaryKeyType::Simple,
HashMap<UInt64, size_t>,
HashMapWithSavedHash<StringRef, size_t, DefaultHash<StringRef>>>;
template <typename Value>
using AttributeContainerType = std::conditional_t<std::is_same_v<Value, Array>, std::vector<Value>, PaddedPODArray<Value>>;
struct Attribute final
{
AttributeUnderlyingType type;
std::variant<
AttributeContainerType<UInt8>,
AttributeContainerType<UInt16>,
AttributeContainerType<UInt32>,
AttributeContainerType<UInt64>,
AttributeContainerType<UInt128>,
AttributeContainerType<UInt256>,
AttributeContainerType<Int8>,
AttributeContainerType<Int16>,
AttributeContainerType<Int32>,
AttributeContainerType<Int64>,
AttributeContainerType<Int128>,
AttributeContainerType<Int256>,
AttributeContainerType<Decimal32>,
AttributeContainerType<Decimal64>,
AttributeContainerType<Decimal128>,
AttributeContainerType<Decimal256>,
AttributeContainerType<DateTime64>,
AttributeContainerType<Float32>,
AttributeContainerType<Float64>,
AttributeContainerType<UUID>,
AttributeContainerType<IPv4>,
AttributeContainerType<IPv6>,
AttributeContainerType<StringRef>,
AttributeContainerType<Array>>
container;
std::optional<std::vector<bool>> is_index_null;
};
struct KeyAttribute final
{
KeyContainerType container;
};
void createAttributes();
void blockToAttributes(const Block & block);
void updateData();
void loadData();
void buildHierarchyParentToChildIndexIfNeeded();
void calculateBytesAllocated();
template <typename KeysProvider>
ColumnPtr getAttributeColumn(
const Attribute & attribute,
const DictionaryAttribute & dictionary_attribute,
size_t keys_size,
ColumnPtr default_values_column,
KeysProvider && keys_object) const;
template <typename AttributeType, bool is_nullable, typename ValueSetter, typename DefaultValueExtractor>
void getItemsImpl(
const Attribute & attribute,
DictionaryKeysExtractor<dictionary_key_type> & keys_extractor,
ValueSetter && set_value,
DefaultValueExtractor & default_value_extractor) const;
template <typename AttributeType, bool is_nullable, typename ValueSetter, typename DefaultValueExtractor>
void getItemsImpl(
const Attribute & attribute,
const PaddedPODArray<ssize_t> & key_index_to_element_index,
ValueSetter && set_value,
DefaultValueExtractor & default_value_extractor) const;
template <typename GetContainerFunc>
void getAttributeContainer(size_t attribute_index, GetContainerFunc && get_container_func);
template <typename GetContainerFunc>
void getAttributeContainer(size_t attribute_index, GetContainerFunc && get_container_func) const;
void resize(size_t added_rows);
const DictionaryStructure dict_struct;
const DictionarySourcePtr source_ptr;
const HashedArrayDictionaryStorageConfiguration configuration;
std::vector<Attribute> attributes;
KeyAttribute key_attribute;
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 hierarchical_index;
};
extern template class HashedArrayDictionary<DictionaryKeyType::Simple>;
extern template class HashedArrayDictionary<DictionaryKeyType::Complex>;
}
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