Function create

src/DataTypes/DataTypeNullable.cpp:134–142

}

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)