**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

error_parts += (*it)->getNameWithState() + " ";
        };
        auto it_middle = data_parts_by_info.lower_bound(part->info);
        
        if (it_middle != data_parts_by_info.begin())
        {
            auto it = std::prev(it_middle);
            if (part->contains(**it) && is_appropriate_state((*it)->getState()))
            {
                
                if ((*it)->info.min_block != part->info.min_block)
                    update_error(it);
                if ((*it)->getState() != DataPartState::Committed)
                {
                    addPartContributionToColumnSizes(*it);
                    addPartContributionToDataVolume(*it);
                    modifyPartState(it, DataPartState::Committed); 
                }
                pos = (*it)->info.max_block + 1;
                restored.push_back((*it)->name);
            }
            else
                update_error(it);
        }
        else
            error = true;
        
        for (auto it = it_middle; it != data_parts_by_info.end() && part->contains(**it); ++it)
        {
            if ((*it)->info.min_block < pos)