table: add opt-in pyiceberg-core arrow reader#2
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Stack position: PyIceberg PR after #1 (ABA-158).
Adds an env-gated
DataScan.to_arrow_batch_reader()path using pyiceberg_core ArrowReader whenPYICEBERG_RUST_ARROW_SCANis enabled. Existing PyArrow behavior remains the default. The native path is skipped for limits and for projections that would require reading filter-only fields; unsupported native shapes fall back with a warning.Validation:
Challenger loop: red-team found limit handling and missing-core fallback issues; both were fixed. Final review green.