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DataTypeNullable.cpp
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210 lines (163 loc) · 6.31 KB
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#include <DataTypes/DataTypeNullable.h>
#include <DataTypes/NullableUtils.h>
#include <DataTypes/DataTypeNothing.h>
#include <DataTypes/DataTypeFactory.h>
#include <DataTypes/Serializations/SerializationNullable.h>
#include <DataTypes/DataTypeLowCardinality.h>
#include <DataTypes/DataTypeVariant.h>
#include <Columns/ColumnNullable.h>
#include <Columns/ColumnConst.h>
#include <Core/Field.h>
#include <Parsers/IAST.h>
#include <Common/typeid_cast.h>
#include <Common/assert_cast.h>
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
}
DataTypeNullable::DataTypeNullable(const DataTypePtr & nested_data_type_)
: nested_data_type{nested_data_type_}
{
if (!nested_data_type->canBeInsideNullable())
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Nested type {} cannot be inside Nullable type", nested_data_type->getName());
}
bool DataTypeNullable::onlyNull() const
{
return typeid_cast<const DataTypeNothing *>(nested_data_type.get());
}
MutableColumnPtr DataTypeNullable::createColumn() const
{
return ColumnNullable::create(nested_data_type->createColumn(), ColumnUInt8::create());
}
Field DataTypeNullable::getDefault() const
{
return Null();
}
size_t DataTypeNullable::getSizeOfValueInMemory() const
{
throw Exception(ErrorCodes::LOGICAL_ERROR, "Value of type {} in memory is not of fixed size.", getName());
}
bool DataTypeNullable::equals(const IDataType & rhs) const
{
return rhs.isNullable() && nested_data_type->equals(*static_cast<const DataTypeNullable &>(rhs).nested_data_type);
}
void DataTypeNullable::updateHashImpl(SipHash & hash) const
{
nested_data_type->updateHash(hash);
}
ColumnPtr DataTypeNullable::createColumnConst(size_t size, const Field & field) const
{
if (onlyNull())
{
auto column = createColumn();
column->insert(field);
return ColumnConst::create(std::move(column), size);
}
auto column = nested_data_type->createColumn();
bool is_null = field.isNull();
if (is_null)
nested_data_type->insertDefaultInto(*column);
else
column->insert(field);
auto null_mask = ColumnUInt8::create();
null_mask->getData().push_back(is_null ? 1 : 0);
auto res = ColumnNullable::create(std::move(column), std::move(null_mask));
return ColumnConst::create(std::move(res), size);
}
SerializationPtr DataTypeNullable::doGetDefaultSerialization() const
{
return std::make_shared<SerializationNullable>(nested_data_type->getDefaultSerialization());
}
void DataTypeNullable::forEachChild(const ChildCallback & callback) const
{
callback(*nested_data_type);
nested_data_type->forEachChild(callback);
}
std::unique_ptr<ISerialization::SubstreamData> DataTypeNullable::getDynamicSubcolumnData(std::string_view subcolumn_name, const DB::IDataType::SubstreamData & data, bool throw_if_null) const
{
auto nested_type = assert_cast<const DataTypeNullable &>(*data.type).nested_data_type;
ISerialization::SubstreamData nested_data(nested_type->getDefaultSerialization());
nested_data.type = nested_type;
nested_data.column = data.column ? assert_cast<const ColumnNullable &>(*data.column).getNestedColumnPtr() : nullptr;
auto nested_subcolumn_data = DB::IDataType::getSubcolumnData(subcolumn_name, nested_data, throw_if_null);
if (!nested_subcolumn_data)
return nullptr;
auto creator = NullableSubcolumnCreator(data.column ? assert_cast<const ColumnNullable &>(*data.column).getNullMapColumnPtr() : nullptr);
auto res = std::make_unique<ISerialization::SubstreamData>();
res->serialization = creator.create(nested_subcolumn_data->serialization, nested_subcolumn_data->type);
res->type = creator.create(nested_subcolumn_data->type);
if (data.column)
res->column = creator.create(nested_subcolumn_data->column);
return res;
}
static DataTypePtr create(const ASTPtr & arguments)
{
if (!arguments || arguments->children.size() != 1)
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH, "Nullable data type family must have exactly one argument - nested type");
DataTypePtr nested_type = DataTypeFactory::instance().get(arguments->children[0]);
return std::make_shared<DataTypeNullable>(nested_type);
}
void registerDataTypeNullable(DataTypeFactory & factory)
{
factory.registerDataType("Nullable", create);
}
DataTypePtr makeNullable(const DataTypePtr & type)
{
if (type->isNullable())
return type;
return std::make_shared<DataTypeNullable>(type);
}
DataTypePtr makeNullableSafe(const DataTypePtr & type)
{
if (type->canBeInsideNullable())
return makeNullable(type);
return type;
}
DataTypePtr removeNullable(const DataTypePtr & type)
{
if (type->isNullable())
return static_cast<const DataTypeNullable &>(*type).getNestedType();
return type;
}
DataTypePtr makeNullableOrLowCardinalityNullable(const DataTypePtr & type)
{
if (isNullableOrLowCardinalityNullable(type))
return type;
if (type->lowCardinality())
{
const auto & dictionary_type = assert_cast<const DataTypeLowCardinality &>(*type).getDictionaryType();
return std::make_shared<DataTypeLowCardinality>(makeNullable(dictionary_type));
}
return std::make_shared<DataTypeNullable>(type);
}
DataTypePtr makeNullableOrLowCardinalityNullableSafe(const DataTypePtr & type)
{
if (isNullableOrLowCardinalityNullable(type))
return type;
if (type->lowCardinality())
{
const auto & dictionary_type = assert_cast<const DataTypeLowCardinality &>(*type).getDictionaryType();
return std::make_shared<DataTypeLowCardinality>(makeNullable(dictionary_type));
}
return makeNullableSafe(type);
}
DataTypePtr removeNullableOrLowCardinalityNullable(const DataTypePtr & type)
{
if (type->isNullable())
return static_cast<const DataTypeNullable &>(*type).getNestedType();
if (type->isLowCardinalityNullable())
{
auto dict_type = removeNullable(static_cast<const DataTypeLowCardinality &>(*type).getDictionaryType());
return std::make_shared<DataTypeLowCardinality>(dict_type);
}
return type;
}
bool canContainNull(const IDataType & type)
{
return type.isNullable() || type.isLowCardinalityNullable() || isDynamic(type) || isVariant(type);
}
}