KYinXu opened a new pull request, #5680:
URL: https://github.com/apache/texera/pull/5680

   ### What changes were proposed in this PR?
   Pin the runtime reconfiguration contract of `MapOpDesc` — the abstract base 
class for map-family operator descriptors (e.g. `ProjectionOpDesc`, 
`TypeCastingOpDesc`, `DictionaryMatcherOpDesc`). Its only override is 
`runtimeReconfiguration`, which always succeeds, dispatches to the new 
descriptor's `getPhysicalOp`, ignores the old descriptor, and returns no 
state-transfer function. Any drift in that policy would silently break mid-run 
operator edits for every map-family operator. No production-code changes.
   | Spec | Source Class | Tests |
   | --- | --- | --- |
   | `MapOpDescSpec` | `MapOpDesc` | 4 |
   
   Spec file name follows the `<srcClassName>Spec.scala` one-to-one convention.
   `MapOpDesc` is abstract, so the spec exercises it through a minimal 
test-only concrete subclass (`RecordingMapOpDesc`) that returns a recognizable 
sentinel `PhysicalOp` from `getPhysicalOp` and records the `workflowId` / 
`executionId` arguments passed in.
   
   **Behavior pinned — `MapOpDesc.runtimeReconfiguration`**
   | Surface | Contract |
   | --- | --- |
   | `runtimeReconfiguration` | returns `Success(...)`, never `Failure`, 
regardless of inputs |
   | Result's `PhysicalOp` | same instance as 
`newOpDesc.getPhysicalOp(workflowId, executionId)` (reference identity) |
   | Result's `StateTransferFunc` | `None` — map operators are stateless and 
need no state transfer across reconfiguration |
   | `oldOpDesc` argument | ignored — two different `oldOpDesc` instances 
(`DummyOpDesc` vs `ProjectionOpDesc`) produce identical results when 
`newOpDesc` is held constant |
   | Distinct `workflowId` / `executionId` | propagate through to 
`newOpDesc.getPhysicalOp` (the same arguments must reach the new desc's call) |
   ### Any related issues, documentation, discussions?
   Closes #5664
   ### How was this PR tested?
   Unit tests were added here, tested through local verification:
   - `sbt "WorkflowOperator/testOnly 
org.apache.texera.amber.operator.map.MapOpDescSpec"` — all 4 tests passed
   - `sbt scalafmtCheckAll` — clean
   ### Was this PR authored or co-authored using generative AI tooling?
   Generated-by: Composer 2.5 Fast


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