**Describe the bug**

I have a table like:

```
CREATE TABLE test (
    time DateTime64(3)
    ...
) ENGINE = MergeTree()
PARTITION BY toStartOfInterval(time, INTERVAL 1 HOUR)
...
```

But when I search in `system.parts` it does not appear to have the `min/max` columns appropriately set?

```
partition:                             2020-06-01 01:00:00
min_date:                              1970-01-01
max_date:                              1970-01-01
min_time:                              1970-01-01 00:00:00
max_time:                              1970-01-01 00:00:00
```

I assume that if these were correctly set, doing a `select toStartOfInterval(time, interval 1 day), count()` type query would be pretty instant rather than trying to scan everything? I am guessing this is due to the `DateTime64` type in use?

Clickhouse 20.11.3.3

++suspicious_broken_parts;
                return;
            }
            try
            {
                part->loadColumnsChecksumsIndexes(require_part_metadata, true);
            }
            catch (const Exception & e)
            {
                
                
                
                if (isNotEnoughMemoryErrorCode(e.code()))
                    throw;
                broken = true;
                tryLogCurrentException(__PRETTY_FUNCTION__);
            }
            catch (...)
            {
                broken = true;
                tryLogCurrentException(__PRETTY_FUNCTION__);
            }
            
            if (broken)
            {
                if (part->info.level == 0)
                {
                    
                    LOG_ERROR(log, "Considering to remove broken part {}{} because it's impossible to repair.", getFullPathOnDisk(part_disk_ptr), part_name);
                    std::lock_guard loading_lock(mutex);