Shekharrajak commented on PR #2423:
URL: https://github.com/apache/iceberg-rust/pull/2423#issuecomment-4443348434
Final plan:
```
1. Comet calls iceberg::arrow::ArrowReaderBuilder.build()
2. iceberg-rust loads Iceberg schema → Schema{id, payload: Variant}
3. iceberg-rust calls schema_to_arrow_schema(schema)
4. The PrimitiveType::Variant arm now returns:
Field { Struct{metadata, value}, ext: "arrow.parquet.variant" }
5. ArrowReaderBuilder builds successfully
6. Parquet reader uses this Arrow schema for projection
7. RecordBatches flow back to Comet
8. Comet's downstream Variant handling fires (because the marker survived)
9. Native Comet execution
``
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