**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.
{
            part_column = ColumnConst::create(std::move(part_column), 1);
            partition_id_column = ColumnConst::create(std::move(partition_id_column), 1);
            part_uuid_column = ColumnConst::create(std::move(part_uuid_column), 1);
            if (has_partition_value)
                partition_value_column = ColumnConst::create(std::move(partition_value_column), 1);
            break;
        }
    }
    block.setColumns(std::move(columns));
    if (!has_partition_value)
        block.erase("_partition_value");
    return block;
}
std::optional<UInt64> MergeTreeData::totalRowsByPartitionPredicateImpl(
    const SelectQueryInfo & query_info, ContextPtr local_context, const DataPartsVector & parts) const
{
    if (parts.empty())
        return 0u;
    auto metadata_snapshot = getInMemoryMetadataPtr();
    ASTPtr expression_ast;
    Block virtual_columns_block = getBlockWithVirtualPartColumns(parts, true );
    
    bool valid = VirtualColumnUtils::prepareFilterBlockWithQuery(query_info.query, local_context, virtual_columns_block, expression_ast);
    PartitionPruner partition_pruner(metadata_snapshot, query_info, local_context, true );
    if (partition_pruner.isUseless() && !valid)
        return {};
    std::unordered_set<String> part_values;
    if (valid && expression_ast)
    {