**How to reproduce**
Clickhouse server 20.13.1.5273
```
CREATE TABLE default.test
(
`key` UInt32,
`ts` DateTime CODEC(DoubleDelta, LZ4),
`db_time` DateTime DEFAULT now() COMMENT 'spout-ignore' CODEC(DoubleDelta, LZ4)
)
ENGINE = MergeTree
PARTITION BY toStartOfTenMinutes(db_time)
ORDER BY (key, ts)
TTL db_time + toIntervalHour(3)
SETTINGS index_granularity = 8192, merge_with_ttl_timeout = 3600, min_rows_for_compact_part = 1000000, min_bytes_for_compact_part = 200000000, in_memory_parts_enable_wal = 0;


INSERT INTO test(key, ts) SELECT number % 1000, now() + intDiv(number,1000) FROM numbers(500);

SELECT * FROM test;
500 rows in set. Elapsed: 0.003 sec.

DETACH TABLE test;

ATTACH TABLE test;

SELECT * FROM test;

0 rows in set. Elapsed: 0.002 sec.
```

**Expected behavior**
Clickhouse would flush parts on disk.
struct SelectQueryInfo;
using NameDependencies = std::unordered_map<String, std::vector<String>>;
using DatabaseAndTableName = std::pair<String, String>;
class IBackup;
using BackupPtr = std::shared_ptr<const IBackup>;
class IBackupEntry;
using BackupEntries = std::vector<std::pair<String, std::unique_ptr<IBackupEntry>>>;
using RestoreDataTasks = std::vector<std::function<void()>>;
struct ColumnSize
{
    size_t marks = 0;
    size_t data_compressed = 0;
    size_t data_uncompressed = 0;
    void add(const ColumnSize & other)
    {
        marks += other.marks;
        data_compressed += other.data_compressed;
        data_uncompressed += other.data_uncompressed;
    }
};
using IndexSize = ColumnSize;
/** Storage. Describes the table. Responsible for
  * - storage of the table data;
  * - the definition in which files (or not in files) the data is stored;
  * - data lookups and appends;
  * - data storage structure (compression, etc.)
  * - concurrent access to data (locks, etc.)
  */
class IStorage : public std::enable_shared_from_this<IStorage>, public TypePromotion<IStorage>, public IHints<1, IStorage>