JonasJ-ap commented on code in PR #6997:
URL: https://github.com/apache/iceberg/pull/6997#discussion_r1174167581


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python/pyiceberg/io/pyarrow.py:
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@@ -122,6 +126,12 @@
 ONE_MEGABYTE = 1024 * 1024
 BUFFER_SIZE = "buffer-size"
 ICEBERG_SCHEMA = b"iceberg.schema"
+FIELD_ID = "field_id"
+FIELD_DOC = "doc"
+PYARROW_FIELD_ID_KEYS = [b"PARQUET:field_id", b"field_id"]

Review Comment:
   I added support for the non-prefixed `field_id` to maintain consistency with 
the `schema_to_pyarrow` visitor, which uses `field_id` as the metadata key. 
This support may be helpful in the future if we use this visitor to get the 
`pa.Schema` for writing data files. Additionally, it allows us to perform 
round-trip tests by combining `schema_to_pyarrow` and `pyarrow_to_schema`.
   
   The `pyarrow_to_schema` visitor first looks for `PARQUET:field_id` and then 
falls back to `field_id`, so the behavior is as expected. However, if you still 
think the non-prefixed `field_id` should not be supported, please let me know.



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