**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

LOG_WARNING(data.log, "Tried to commit obsolete part {} covered by {}", part->name, covering_part->getNameWithState());
                part->remove_time.store(0, std::memory_order_relaxed); 
                data.modifyPartState(part, DataPartState::Outdated);
            }
            else
            {
                total_covered_parts.insert(total_covered_parts.end(), covered_parts.begin(), covered_parts.end());
                for (const DataPartPtr & covered_part : covered_parts)
                {
                    covered_part->remove_time.store(current_time, std::memory_order_relaxed);
                    reduce_bytes += covered_part->getBytesOnDisk();
                    reduce_rows += covered_part->rows_count;
                    data.modifyPartState(covered_part, DataPartState::Outdated);
                    data.removePartContributionToColumnSizes(covered_part);
                }
                reduce_parts += covered_parts.size();
                add_bytes += part->getBytesOnDisk();
                add_rows += part->rows_count;
                ++add_parts;
                data.modifyPartState(part, DataPartState::Committed);
                data.addPartContributionToColumnSizes(part);
            }
        }
        data.decreaseDataVolume(reduce_bytes, reduce_rows, reduce_parts);
        data.increaseDataVolume(add_bytes, add_rows, add_parts);
    }
    clear();
    return total_covered_parts;
}
bool MergeTreeData::isPrimaryOrMinMaxKeyColumnPossiblyWrappedInFunctions(