kosiew opened a new issue, #17760:
URL: https://github.com/apache/datafusion/issues/17760
# 1. Introduce `CastColumnExpr` expression node
* **Goal:** Add a dedicated physical expression for struct-aware casting
that mirrors the existing `cast_column` helper semantics.
* **Scope & Location:** Implement in `datafusion/physical-expr` (expression
definition, evaluation logic, scalar/array handling) and expose via the crate’s
public API.
* **Key Tasks:**
* Define the `CastColumnExpr` struct with schema metadata (input field,
target field) and implement `PhysicalExpr`.
* Use `datafusion_common::nested_struct::cast_column` in `evaluate` for
array and scalar cases, preserving nullability and field ordering.
* Ensure type coercion rules and `data_type` / `nullable` methods reflect
the target field accurately.
* Add unit tests covering basic casts, missing child fields, null-padding,
and nested structs.
* Update documentation or module comments describing when to use
`CastColumnExpr`.
* **Out of Scope:** Any planner/optimizer integration, protobuf wiring, or
schema-rewriter changes.
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