**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.
log_subtract(total_secondary_index_size.data_uncompressed, part_secondary_index_size.data_uncompressed, ".data_uncompressed");
        log_subtract(total_secondary_index_size.marks, part_secondary_index_size.marks, ".marks");
    }
}
void MergeTreeData::checkAlterPartitionIsPossible(
    const PartitionCommands & commands, const StorageMetadataPtr & , const Settings & settings) const
{
    for (const auto & command : commands)
    {
        if (command.type == PartitionCommand::DROP_DETACHED_PARTITION
            && !settings.allow_drop_detached)
            throw DB::Exception("Cannot execute query: DROP DETACHED PART is disabled "
                                "(see allow_drop_detached setting)", ErrorCodes::SUPPORT_IS_DISABLED);
        if (command.partition && command.type != PartitionCommand::DROP_DETACHED_PARTITION)
        {
            if (command.part)
            {
                auto part_name = command.partition->as<ASTLiteral &>().value.safeGet<String>();
                
                MergeTreePartInfo::fromPartName(part_name, format_version);
            }
            else
            {
                
                getPartitionIDFromQuery(command.partition, getContext());
            }
        }
    }
}
void MergeTreeData::checkPartitionCanBeDropped(const ASTPtr & partition)