**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.
PartLogElement::Type type,
        const ExecutionStatus & execution_status,
        UInt64 elapsed_ns,
        const String & new_part_name,
        const DataPartPtr & result_part,
        const DataPartsVector & source_parts,
        const MergeListEntry * merge_entry);
    
    
    
    virtual bool partIsAssignedToBackgroundOperation(const DataPartPtr & part) const = 0;
    
    
    
    
    virtual MutationCommands getFirstAlterMutationCommandsForPart(const DataPartPtr & part) const = 0;
    
    bool movePartsToSpace(const DataPartsVector & parts, SpacePtr space);
private:
    
    
    
    struct CurrentlyMovingPartsTagger
    {
        MergeTreeMovingParts parts_to_move;
        MergeTreeData & data;
        CurrentlyMovingPartsTagger(MergeTreeMovingParts && moving_parts_, MergeTreeData & data_);
        ~CurrentlyMovingPartsTagger();
    };
    using CurrentlyMovingPartsTaggerPtr = std::shared_ptr<CurrentlyMovingPartsTagger>;