[REF] optimize get_studies_by_mask (#891)
#1152
| Job | Run time |
|---|---|
| 6s | |
| 1m 10s | |
| 38m 32s | |
| 40m 28s | |
| 31m 22s | |
| 41m 1s | |
| 11m 25s | |
| 41m 28s | |
| 23m 2s | |
| 1h 6m 58s | |
| 42m 25s | |
| 42m 22s | |
| 21m 48s | |
| 23m 21s | |
| 22m 55s | |
| 24m 3s | |
| 13s | |
| 7h 52m 39s |