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

394 lines
12 KiB
C++

#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>
#include <statdaemons/ext/range.hpp>
#include <memory>
namespace DB
{
class HashedDictionary final : public IDictionary
{
public:
HashedDictionary(const std::string & name, const DictionaryStructure & dict_struct,
DictionarySourcePtr source_ptr, const DictionaryLifetime dict_lifetime)
: name{name}, dict_struct(dict_struct),
source_ptr{std::move(source_ptr)}, dict_lifetime(dict_lifetime)
{
createAttributes();
loadData();
}
HashedDictionary(const HashedDictionary & other)
: HashedDictionary{other.name, other.dict_struct, other.source_ptr->clone(), other.dict_lifetime}
{}
std::string getName() const override { return name; }
std::string getTypeName() const override { return "HashedDictionary"; }
bool isCached() const override { return false; }
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; }
bool hasHierarchy() const override { return hierarchical_attribute; }
id_t toParent(const id_t id) const override
{
const auto attr = hierarchical_attribute;
switch (hierarchical_attribute->type)
{
case AttributeType::uint8:
{
const auto it = attr->uint8_map->find(id);
return it != attr->uint8_map->end() ? it->second : attr->uint8_null_value;
}
case AttributeType::uint16:
{
const auto it = attr->uint16_map->find(id);
return it != attr->uint16_map->end() ? it->second : attr->uint16_null_value;
}
case AttributeType::uint32:
{
const auto it = attr->uint32_map->find(id);
return it != attr->uint32_map->end() ? it->second : attr->uint32_null_value;
}
case AttributeType::uint64:
{
const auto it = attr->uint64_map->find(id);
return it != attr->uint64_map->end() ? it->second : attr->uint64_null_value;
}
case AttributeType::int8:
{
const auto it = attr->int8_map->find(id);
return it != attr->int8_map->end() ? it->second : attr->int8_null_value;
}
case AttributeType::int16:
{
const auto it = attr->int16_map->find(id);
return it != attr->int16_map->end() ? it->second : attr->int16_null_value;
}
case AttributeType::int32:
{
const auto it = attr->int32_map->find(id);
return it != attr->int32_map->end() ? it->second : attr->int32_null_value;
}
case AttributeType::int64:
{
const auto it = attr->int64_map->find(id);
return it != attr->int64_map->end() ? it->second : attr->int64_null_value;
}
case AttributeType::float32:
case AttributeType::float64:
case AttributeType::string:
break;
};
throw Exception{
"Hierarchical attribute has non-integer type " + toString(hierarchical_attribute->type),
ErrorCodes::TYPE_MISMATCH
};
}
#define DECLARE_INDIVIDUAL_GETTER(TYPE, NAME, LC_TYPE) \
TYPE get##NAME(const std::string & attribute_name, const id_t id) const override\
{\
const auto idx = getAttributeIndex(attribute_name);\
const auto & attribute = attributes[idx];\
if (attribute.type != AttributeType::LC_TYPE)\
throw Exception{\
"Type mismatch: attribute " + attribute_name + " has type " + toString(attribute.type),\
ErrorCodes::TYPE_MISMATCH\
};\
\
const auto it = attribute.LC_TYPE##_map->find(id);\
if (it != attribute.LC_TYPE##_map->end())\
return it->second;\
\
return attribute.LC_TYPE##_null_value;\
}
DECLARE_INDIVIDUAL_GETTER(UInt8, UInt8, uint8)
DECLARE_INDIVIDUAL_GETTER(UInt16, UInt16, uint16)
DECLARE_INDIVIDUAL_GETTER(UInt32, UInt32, uint32)
DECLARE_INDIVIDUAL_GETTER(UInt64, UInt64, uint64)
DECLARE_INDIVIDUAL_GETTER(Int8, Int8, int8)
DECLARE_INDIVIDUAL_GETTER(Int16, Int16, int16)
DECLARE_INDIVIDUAL_GETTER(Int32, Int32, int32)
DECLARE_INDIVIDUAL_GETTER(Int64, Int64, int64)
DECLARE_INDIVIDUAL_GETTER(Float32, Float32, float32)
DECLARE_INDIVIDUAL_GETTER(Float64, Float64, float64)
DECLARE_INDIVIDUAL_GETTER(StringRef, String, string)
#undef DECLARE_INDIVIDUAL_GETTER
#define DECLARE_MULTIPLE_GETTER(TYPE, LC_TYPE)\
void get##TYPE(const std::string & attribute_name, const PODArray<id_t> & ids, PODArray<TYPE> & out) const override\
{\
const auto idx = getAttributeIndex(attribute_name);\
const auto & attribute = attributes[idx];\
if (attribute.type != AttributeType::LC_TYPE)\
throw Exception{\
"Type mismatch: attribute " + attribute_name + " has type " + toString(attribute.type),\
ErrorCodes::TYPE_MISMATCH\
};\
\
const auto & attr = *attribute.LC_TYPE##_map;\
const auto null_value = attribute.LC_TYPE##_null_value;\
\
for (const auto i : ext::range(0, ids.size()))\
{\
const auto it = attr.find(ids[i]);\
out[i] = it != attr.end() ? it->second : null_value;\
}\
}
DECLARE_MULTIPLE_GETTER(UInt8, uint8)
DECLARE_MULTIPLE_GETTER(UInt16, uint16)
DECLARE_MULTIPLE_GETTER(UInt32, uint32)
DECLARE_MULTIPLE_GETTER(UInt64, uint64)
DECLARE_MULTIPLE_GETTER(Int8, int8)
DECLARE_MULTIPLE_GETTER(Int16, int16)
DECLARE_MULTIPLE_GETTER(Int32, int32)
DECLARE_MULTIPLE_GETTER(Int64, int64)
DECLARE_MULTIPLE_GETTER(Float32, float32)
DECLARE_MULTIPLE_GETTER(Float64, float64)
#undef DECLARE_MULTIPLE_GETTER
void getString(const std::string & attribute_name, const PODArray<id_t> & ids, ColumnString * out) const override
{
const auto idx = getAttributeIndex(attribute_name);
const auto & attribute = attributes[idx];
if (attribute.type != AttributeType::string)
throw Exception{
"Type mismatch: attribute " + attribute_name + " has type " + toString(attribute.type),
ErrorCodes::TYPE_MISMATCH
};
const auto & attr = *attribute.string_map;
const auto null_value = attribute.string_null_value;
for (const auto i : ext::range(0, ids.size()))
{
const auto it = attr.find(ids[i]);
const auto string_ref = it != attr.end() ? it->second : null_value;
out->insertData(string_ref.data, string_ref.size);
}
}
private:
struct attribute_t
{
AttributeType type;
UInt8 uint8_null_value;
UInt16 uint16_null_value;
UInt32 uint32_null_value;
UInt64 uint64_null_value;
Int8 int8_null_value;
Int16 int16_null_value;
Int32 int32_null_value;
Int64 int64_null_value;
Float32 float32_null_value;
Float64 float64_null_value;
String string_null_value;
std::unique_ptr<HashMap<UInt64, UInt8>> uint8_map;
std::unique_ptr<HashMap<UInt64, UInt16>> uint16_map;
std::unique_ptr<HashMap<UInt64, UInt32>> uint32_map;
std::unique_ptr<HashMap<UInt64, UInt64>> uint64_map;
std::unique_ptr<HashMap<UInt64, Int8>> int8_map;
std::unique_ptr<HashMap<UInt64, Int16>> int16_map;
std::unique_ptr<HashMap<UInt64, Int32>> int32_map;
std::unique_ptr<HashMap<UInt64, Int64>> int64_map;
std::unique_ptr<HashMap<UInt64, Float32>> float32_map;
std::unique_ptr<HashMap<UInt64, Float64>> float64_map;
std::unique_ptr<Arena> string_arena;
std::unique_ptr<HashMap<UInt64, StringRef>> string_map;
};
void createAttributes()
{
const auto size = dict_struct.attributes.size();
attributes.reserve(size);
for (const auto & attribute : dict_struct.attributes)
{
attribute_index_by_name.emplace(attribute.name, attributes.size());
attributes.push_back(std::move(createAttributeWithType(getAttributeTypeByName(attribute.type),
attribute.null_value)));
if (attribute.hierarchical)
hierarchical_attribute = &attributes.back();
}
}
void loadData()
{
auto stream = source_ptr->loadAll();
stream->readPrefix();
while (const auto block = stream->read())
{
const auto & id_column = *block.getByPosition(0).column;
for (const auto attribute_idx : ext::range(0, attributes.size()))
{
const auto & attribute_column = *block.getByPosition(attribute_idx + 1).column;
auto & attribute = attributes[attribute_idx];
for (const auto row_idx : ext::range(0, id_column.size()))
setAttributeValue(attribute, id_column[row_idx].get<UInt64>(), attribute_column[row_idx]);
}
}
stream->readSuffix();
}
attribute_t createAttributeWithType(const AttributeType type, const std::string & null_value)
{
attribute_t attr{type};
switch (type)
{
case AttributeType::uint8:
attr.uint8_null_value = DB::parse<UInt8>(null_value);
attr.uint8_map.reset(new HashMap<UInt64, UInt8>);
break;
case AttributeType::uint16:
attr.uint16_null_value = DB::parse<UInt16>(null_value);
attr.uint16_map.reset(new HashMap<UInt64, UInt16>);
break;
case AttributeType::uint32:
attr.uint32_null_value = DB::parse<UInt32>(null_value);
attr.uint32_map.reset(new HashMap<UInt64, UInt32>);
break;
case AttributeType::uint64:
attr.uint64_null_value = DB::parse<UInt64>(null_value);
attr.uint64_map.reset(new HashMap<UInt64, UInt64>);
break;
case AttributeType::int8:
attr.int8_null_value = DB::parse<Int8>(null_value);
attr.int8_map.reset(new HashMap<UInt64, Int8>);
break;
case AttributeType::int16:
attr.int16_null_value = DB::parse<Int16>(null_value);
attr.int16_map.reset(new HashMap<UInt64, Int16>);
break;
case AttributeType::int32:
attr.int32_null_value = DB::parse<Int32>(null_value);
attr.int32_map.reset(new HashMap<UInt64, Int32>);
break;
case AttributeType::int64:
attr.int64_null_value = DB::parse<Int64>(null_value);
attr.int64_map.reset(new HashMap<UInt64, Int64>);
break;
case AttributeType::float32:
attr.float32_null_value = DB::parse<Float32>(null_value);
attr.float32_map.reset(new HashMap<UInt64, Float32>);
break;
case AttributeType::float64:
attr.float64_null_value = DB::parse<Float64>(null_value);
attr.float64_map.reset(new HashMap<UInt64, Float64>);
break;
case AttributeType::string:
attr.string_null_value = null_value;
attr.string_arena.reset(new Arena);
attr.string_map.reset(new HashMap<UInt64, StringRef>);
break;
}
return attr;
}
void setAttributeValue(attribute_t & attribute, const id_t id, const Field & value)
{
switch (attribute.type)
{
case AttributeType::uint8:
{
attribute.uint8_map->insert({ id, value.get<UInt64>() });
break;
}
case AttributeType::uint16:
{
attribute.uint16_map->insert({ id, value.get<UInt64>() });
break;
}
case AttributeType::uint32:
{
attribute.uint32_map->insert({ id, value.get<UInt64>() });
break;
}
case AttributeType::uint64:
{
attribute.uint64_map->insert({ id, value.get<UInt64>() });
break;
}
case AttributeType::int8:
{
attribute.int8_map->insert({ id, value.get<Int64>() });
break;
}
case AttributeType::int16:
{
attribute.int16_map->insert({ id, value.get<Int64>() });
break;
}
case AttributeType::int32:
{
attribute.int32_map->insert({ id, value.get<Int64>() });
break;
}
case AttributeType::int64:
{
attribute.int64_map->insert({ id, value.get<Int64>() });
break;
}
case AttributeType::float32:
{
attribute.float32_map->insert({ id, value.get<Float64>() });
break;
}
case AttributeType::float64:
{
attribute.float64_map->insert({ id, value.get<Float64>() });
break;
}
case AttributeType::string:
{
const auto & string = value.get<String>();
const auto string_in_arena = attribute.string_arena->insert(string.data(), string.size());
attribute.string_map->insert({ id, StringRef{string_in_arena, string.size()} });
break;
}
};
}
std::size_t getAttributeIndex(const std::string & attribute_name) const
{
const auto it = attribute_index_by_name.find(attribute_name);
if (it == std::end(attribute_index_by_name))
throw Exception{
"No such attribute '" + attribute_name + "'",
ErrorCodes::BAD_ARGUMENTS
};
return it->second;
}
const std::string name;
const DictionaryStructure dict_struct;
const DictionarySourcePtr source_ptr;
const DictionaryLifetime dict_lifetime;
std::map<std::string, std::size_t> attribute_index_by_name;
std::vector<attribute_t> attributes;
const attribute_t * hierarchical_attribute = nullptr;
};
}