fix: Single fragment scaling is too conservative #19259
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In previous versions, when handling a single fragment, it would be skipped if the current worker was included in the list of schedulable workers, which could lead to an imbalance.
Additionally, this PR attempts to use
[]
to access the key in the hashmap, replacing get().unwrap() for better debugging.Checklist
./risedev check
(or alias,./risedev c
)