**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.
e.addMessage("(while initializing MergeTree partition key from date column " + backQuote(date_column_name) + ")");
            throw;
        }
    }
    else
    {
        is_custom_partitioned = true;
        checkPartitionKeyAndInitMinMax(metadata_.partition_key);
        min_format_version = MERGE_TREE_DATA_MIN_FORMAT_VERSION_WITH_CUSTOM_PARTITIONING;
    }
    setProperties(metadata_, metadata_, attach);
    
    merging_params.check(metadata_);
    if (metadata_.sampling_key.definition_ast != nullptr)
    {
        
        checkSampleExpression(metadata_, attach || settings->compatibility_allow_sampling_expression_not_in_primary_key,
                              settings->check_sample_column_is_correct && !attach);
    }
    checkTTLExpressions(metadata_, metadata_);
    
    PathWithDisk version_file;
    
    for (const auto & disk : getDisks())
    {
        disk->createDirectories(relative_data_path);
        disk->createDirectories(fs::path(relative_data_path) / MergeTreeData::DETACHED_DIR_NAME);
        String current_version_file_path = fs::path(relative_data_path) / MergeTreeData::FORMAT_VERSION_FILE_NAME;
        if (disk->exists(current_version_file_path))
        {