kosiew opened a new issue, #17762:
URL: https://github.com/apache/datafusion/issues/17762
# 3. Add serialization/deserialization support
* **Goal:** Ensure plans containing `CastColumnExpr` round-trip through
protobuf for distributed execution.
* **Scope & Location:** `datafusion/physical-plan` protobuf definitions and
converters; round-trip tests under `datafusion/physical-plan` or related crates.
* **Key Tasks:**
* Extend protobuf schema with a message for `CastColumnExpr` carrying
input/target field descriptors.
* Update Rust proto builders to emit/consume the new message, mapping back
to the expression type.
* Add/extend round-trip tests to cover `CastColumnExpr` inside
representative plans.
* Document any compatibility considerations (e.g., versioning, defaults).
* **Dependencies:** Requires `CastColumnExpr` definition (spec #1).
* **Out of Scope:** Planner rewrites or optimizer behavior.
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