**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

PartLogElement::Type type,
    const ExecutionStatus & execution_status,
    UInt64 elapsed_ns,
    const String & new_part_name,
    const DataPartPtr & result_part,
    const DataPartsVector & source_parts,
    const MergeListEntry * merge_entry)
try
{
    auto table_id = getStorageID();
    auto part_log = global_context.getPartLog(table_id.database_name);
    if (!part_log)
        return;
    PartLogElement part_log_elem;
    part_log_elem.event_type = type;
    part_log_elem.error = static_cast<UInt16>(execution_status.code);
    part_log_elem.exception = execution_status.message;
    
    
    const auto time_now = std::chrono::system_clock::now();
    part_log_elem.event_time = time_in_seconds(time_now);
    part_log_elem.event_time_microseconds = time_in_microseconds(time_now);
    
    part_log_elem.duration_ms = elapsed_ns / 1000000;
    part_log_elem.database_name = table_id.database_name;
    part_log_elem.table_name = table_id.table_name;
    part_log_elem.partition_id = MergeTreePartInfo::fromPartName(new_part_name, format_version).partition_id;
    part_log_elem.part_name = new_part_name;
    if (result_part)