Add sparse-read primitives: shards_initialized and read_regions
#13459
| Job | Run time |
|---|---|
| 12s | |
| 5s | |
| -1s | |
| 16s |
shards_initialized and read_regions
#13459
| Job | Run time |
|---|---|
| 12s | |
| 5s | |
| -1s | |
| 16s |