**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

}
    else
    {
        try
        {
            
    #if !__clang__
    #    pragma GCC diagnostic push
    #    pragma GCC diagnostic ignored "-Wunused-variable"
    #endif
            for (const auto & [file, _] : checksums.files)
                volume->getDisk()->removeSharedFile(to + "/" + file, keep_s3);
    #if !__clang__
    #    pragma GCC diagnostic pop
    #endif
            for (const auto & file : {"checksums.txt", "columns.txt"})
                volume->getDisk()->removeSharedFile(to + "/" + file, keep_s3);
            volume->getDisk()->removeSharedFileIfExists(to + "/" + DEFAULT_COMPRESSION_CODEC_FILE_NAME, keep_s3);
            volume->getDisk()->removeSharedFileIfExists(to + "/" + DELETE_ON_DESTROY_MARKER_FILE_NAME, keep_s3);
            volume->getDisk()->removeDirectory(to);
        }
        catch (...)
        {
            
            LOG_ERROR(storage.log, "Cannot quickly remove directory {} by removing files; fallback to recursive removal. Reason: {}", fullPath(volume->getDisk(), to), getCurrentExceptionMessage(false));
            volume->getDisk()->removeSharedRecursive(to + "/", keep_s3);
        }
    }
}
String IMergeTreeDataPart::getRelativePathForPrefix(const String & prefix) const