Expand test_sparse_string_domain for empty strings
#7574
| Job | Run time |
|---|---|
| 5m 23s | |
| 5m 25s | |
| 5m 5s | |
| 5m 18s | |
| 5m 1s | |
| 8m 24s | |
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| 10m 36s | |
| 8m 18s | |
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| 4m 36s | |
| 5m 11s | |
| 4m 23s | |
| 3m 47s | |
| 4m 31s | |
| 10m 36s | |
| 10m 24s | |
| 10m 0s | |
| 10m 2s | |
| 10m 10s | |
| 2h 25m 51s |