kosiew opened a new issue, #17764:
URL: https://github.com/apache/datafusion/issues/17764
# 5. Refactor schema rewriter groundwork
* **Goal:** Prepare `PhysicalExprAdapter` internals for the final switch
without changing external behavior.
* **Scope & Location:**
`datafusion/physical-expr-adapter/src/schema_rewriter.rs` (and any helpers it
calls).
* **Key Tasks:**
* Isolate the structural cleanup already proposed (e.g., factor out helper
functions, introduce quick struct compatibility checks) while keeping current
cast behavior.
* Add/adjust tests ensuring no functional change (existing `CastExpr` path
still used).
* Document new helper responsibilities to aid the next PR.
* **Dependencies:** Independent of specs #1–4 but should land before spec #6
to minimize diff.
* **Out of Scope:** Introducing `CastColumnExpr` usage.
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