stream: fix merge() idle source draining #7715
| Job | Run time |
|---|---|
| 1m 58s | |
| 23s | |
| 26m 6s | |
| 26m 52s | |
| 37m 46s | |
| 22m 36s | |
| 22m 24s | |
| 22m 32s | |
| 22m 42s | |
| 23m 40s | |
| 23m 14s | |
| 3h 50m 13s |
| Job | Run time |
|---|---|
| 1m 58s | |
| 23s | |
| 26m 6s | |
| 26m 52s | |
| 37m 46s | |
| 22m 36s | |
| 22m 24s | |
| 22m 32s | |
| 22m 42s | |
| 23m 40s | |
| 23m 14s | |
| 3h 50m 13s |