[SPARK-56412] Implement DirectWorkerDispatcher that spawns UDF workers as local callable.#55406

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haiyangsun-db wants to merge 9 commits intoapache:masterfrom

haiyangsun-db:SPARK-56412

Commits on Apr 18, 2026

Commits on Apr 23, 2026

cleanup hook - currently per session, but open to idle pooling in future. use a map to manage workers
haiyangsun-db
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Commits on Apr 25, 2026

improved connection abstraction - move connection protocol out from base direct dispatcher, also improved cleanup logic.
haiyangsun-db
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