Add support for iterate_over_all for the CombinedDataset
#379
| Job | Run time |
|---|---|
| 6s | |
| 9s | |
| 1m 18s | |
| 1m 43s | |
| 2m 23s | |
| 1m 28s | |
| 18s | |
| 1m 21s | |
| 1m 12s | |
| 2m 18s | |
| 1m 44s | |
| 4m 34s | |
| 3m 45s | |
| 1s | |
| 22m 20s |