Right now size of data parts is available only for non-detached parts in `system.parts`, but `system.detached_parts` lacks this information. It will be useful for analyzing disk space usage. 

#include <Storages/System/StorageSystemDetachedParts.h>
#include <DataTypes/DataTypeString.h>
#include <DataTypes/DataTypesNumber.h>
#include <DataTypes/DataTypeNullable.h>
#include <Storages/IStorage.h>
#include <Storages/System/StorageSystemPartsBase.h>
#include <Processors/Sources/SourceFromSingleChunk.h>
#include <QueryPipeline/Pipe.h>
namespace DB
{
StorageSystemDetachedParts::StorageSystemDetachedParts(const StorageID & table_id_)