cryptoe opened a new pull request, #14574:
URL: https://github.com/apache/druid/pull/14574
Fixing an issue in sequential merge where workers without any partial key
statistics would get stuck because controller did not change the worker state.
The symptom's are the controller task getting stuck after some of the worker
boundaries are sent.
```
2023-07-12T04:20:46,033 INFO [task-runner-0-priority-0]
org.apache.druid.msq.exec.ControllerImpl - Query [xxx] sending out partition
boundaries for stage 0 for workers {7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18,
34, 35, 36}
```
<hr>
##### Key changed/added classes in this PR
* `WorkerSketchFetcher`
<hr>
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