fixed a problem with multi index caused by the default value of groupkey #1664
| Job | Run time |
|---|---|
| 36m 5s | |
| 39m 15s | |
| 35m 14s | |
| 34m 41s | |
| 41m 47s | |
| 27m 59s | |
| 27m 21s | |
| 27m 14s | |
| 24m 22s | |
| 27m 23s | |
| 28m 24s | |
| 28m 34s | |
| 28m 8s | |
| 25m 13s | |
| 27m 54s | |
| 34m 52s | |
| 36m 48s | |
| 48m 45s | |
| 39m 5s | |
| 35m 33s | |
| 20m 26s | |
| 20m 50s | |
| 15m 24s | |
| 1h 13m 9s | |
| 13m 33s | |
| 18m 19s | |
| 17m 41s | |
| 17m 3s | |
| 13m 42s | |
| 15m 49s | |
| 14h 40m 33s |