andrei-ionescu edited a comment on issue #1404:
URL:
https://github.com/apache/arrow-datafusion/issues/1404#issuecomment-986926373
The use case I'm after is writing data on disk partitioned.
Following the previous example...
```
+-------------------------+---------------+-----+ P1 |
2020-10-18T00:29:41Z | Steam | 11 |
| nlm_dimension_load_date | src_fuel_type | id | |
2020-10-18T00:29:41Z | Steam | 22 |
+-------------------------+---------------+-----+ |
2020-10-18T00:29:41Z | Steam | 33 |
| 2020-10-18T00:29:41Z | Steam | 11 |
| 2020-10-18T00:29:41Z | Steam | 22 |
| 2020-10-18T00:29:41Z | Steam | 33 | P2 |
2021-06-09T00:32:40Z | Gas | 3 |
| 2020-10-18T00:29:41Z | Gas | 1 | |
2021-06-09T00:32:40Z | Gas | 2 |
| 2021-06-09T00:32:40Z | Gas | 3 |
| 2021-06-09T00:32:40Z | Gas | 2 |
| 2021-06-09T00:32:40Z | Electric | a1 | P3 |
2021-06-09T00:32:40Z | Electric | a1 |
| 2020-10-18T00:29:41Z | Electric | b1 |
| 2020-10-18T00:29:41Z | Electric | c1 |
| 2020-10-18T00:29:41Z | Electric | d1 | P4 |
2020-10-18T00:29:41Z | Gas | 1 |
+-------------------------+---------------+-----+
P5 |
2020-10-18T00:29:41Z | Electric | b1 |
|
2020-10-18T00:29:41Z | Electric | c1 |
|
2020-10-18T00:29:41Z | Electric | d1 |
```
I want to write the data in the following folders:
```
nlm_dimension_load_date=2020-10-18T00:29:41Z/src_fuel_type=Steam/
nlm_dimension_load_date=2021-06-09T00:32:40Z/src_fuel_type=Gas/
nlm_dimension_load_date=2021-06-09T00:32:40Z/src_fuel_type=Electric/
nlm_dimension_load_date=2020-10-18T00:29:41Z/src_fuel_type=Gas/
nlm_dimension_load_date=2020-10-18T00:29:41Z/src_fuel_type=Electric/
```
To be able to do that I need the collected data to be returned in correct
partitions, so that I can write those groups/partitions, one by one.
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