**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.
else
    {
        auto normal_result_ptr = reader.estimateNumMarksToRead(
            normal_parts,
            required_columns,
            metadata_snapshot,
            metadata_snapshot,
            query_info,
            query_context,
            settings.max_threads,
            max_added_blocks);
        if (normal_result_ptr->error())
            return;
        if (normal_result_ptr->marks() == 0)
            candidate.complete = true;
        else
        {
            sum_marks += normal_result_ptr->marks();
            candidate.merge_tree_normal_select_result_ptr = normal_result_ptr;
        }
    }
    candidate.merge_tree_projection_select_result_ptr = projection_result_ptr;
    /
    if (sum_marks < min_sum_marks)
    {
        selected_candidate = &candidate;
        min_sum_marks = sum_marks;
    }
}
Block MergeTreeData::getMinMaxCountProjectionBlock(