**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

"Column {} has rows count {} according to size in memory "
                        "and size of single value, but data part {} has {} rows", backQuote(column.name), rows_in_column, name, rows_count);
                }
                size_t last_possibly_incomplete_mark_rows = index_granularity.getLastNonFinalMarkRows();
                
                size_t index_granularity_without_last_mark = index_granularity.getTotalRows() - last_possibly_incomplete_mark_rows;
                
                if (rows_in_column < index_granularity_without_last_mark)
                {
                    throw Exception(
                        ErrorCodes::LOGICAL_ERROR,
                        "Column {} has rows count {} according to size in memory "
                        "and size of single value, but index granularity in part {} without last mark has {} rows, which is more than in column",
                        backQuote(column.name), rows_in_column, name, index_granularity.getTotalRows());
                }
                
                if (rows_in_column - index_granularity_without_last_mark > last_possibly_incomplete_mark_rows)
                {
                     throw Exception(
                        ErrorCodes::LOGICAL_ERROR,
                        "Column {} has rows count {} in last mark according to size in memory "
                        "and size of single value, but index granularity in part {} in last mark has {} rows which is less than in column",
                        backQuote(column.name), rows_in_column - index_granularity_without_last_mark, name, last_possibly_incomplete_mark_rows);
                }
            }
        }
#endif
    }
    else
    {