rdblue commented on code in PR #40:
URL: https://github.com/apache/iceberg-python/pull/40#discussion_r1349764721


##########
pyiceberg/avro/resolver.py:
##########
@@ -233,7 +255,107 @@ def skip(self, decoder: BinaryDecoder) -> None:
         pass
 
 
-class SchemaResolver(PrimitiveWithPartnerVisitor[IcebergType, Reader]):
+class WriteSchemaResolver(PrimitiveWithPartnerVisitor[IcebergType, Writer]):
+    def schema(self, schema: Schema, expected_schema: Optional[IcebergType], 
result: Writer) -> Writer:
+        return result
+
+    def struct(self, struct: StructType, provided_struct: 
Optional[IcebergType], field_writers: List[Writer]) -> Writer:
+        if not isinstance(provided_struct, StructType):
+            raise ResolveError(f"File/write schema are not aligned for struct, 
got {provided_struct}")
+
+        provided_struct_positions: Dict[int, int] = {field.field_id: pos for 
pos, field in enumerate(provided_struct.fields)}

Review Comment:
   Is this backward? `provided_struct` is the file schema The `StructWriter` 
uses `pos` to look up the data in the incoming struct, so it should be the 
position in `struct`, the data's schema.



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