[I] Integrate CastColumnExpr into PhysicalExprAdapter [datafusion]

["kosiew (via GitHub)" <gi...@apache.org>]

kosiew opened a new issue, #20163:
URL: https://github.com/apache/datafusion/issues/20163

   ## Summary
   
   Wire `CastColumnExpr` into `PhysicalExprAdapter` to emit struct-aware cast expressions during physical plan adaptation. Update optimizer and pruning rules as needed.
   
   ## Scope
   
   Complete the integration of `CastColumnExpr` into the adapter's rewrite pipeline, ensuring struct fields are correctly cast and metadata is propagated.
   
   ### Tasks
   
   - [ ] Update `PhysicalExprAdapter` to emit `CastColumnExpr` (instead of current fallback logic)
   - [ ] Integrate with schema rewriter refactoring from ISSUE_01
   - [ ] Update optimizer rules to handle `CastColumnExpr` (if needed)
   - [ ] Update partition pruning to account for `CastColumnExpr` (if needed)
   - [ ] Add focused behavior tests validating adapter + cast interaction
   - [ ] Smoke test with struct projection and filtering queries
   
   ### Files/Modules
   
   - `datafusion/physical-expr-adapter/src/schema_rewriter.rs` (primary integration point)
   - `datafusion/optimizer/` (rules that touch expressions)
   - `datafusion/pruning/` (partition pruning rules)
   - Focused integration tests
   
   ### Key Behaviors
   
   - **Struct projection:** Correctly adapt struct fields to target schema
   - **Nullability propagation:** Field nullability matches target schema
   - **Partition pruning:** Works correctly with adapted cast expressions
   - **Plan optimization:** Optimizer rules don't break on `CastColumnExpr`
   
   ### Acceptance Criteria
   
   ✅ Adapter emits `CastColumnExpr` for schema mismatches  
   ✅ Struct field casting works end-to-end  
   ✅ Optimizer and pruning rules pass all existing tests  
   ✅ New behavior tests validate adapter + cast interaction  
   ✅ Code compiles without warnings  
   
   


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Re: [I] Integrate CastColumnExpr into PhysicalExprAdapter [datafusion]

["kosiew (via GitHub)" <gi...@apache.org>]

kosiew closed issue #20163: Integrate CastColumnExpr into PhysicalExprAdapter
URL: https://github.com/apache/datafusion/issues/20163


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