jorisvandenbossche commented on issue #41741:
URL: https://github.com/apache/arrow/issues/41741#issuecomment-2124247844
For IPC it seems to work:
```python
table = pa.Table.from_arrays(
[pa.array([None, None], pa.null())],
schema=pa.schema([pa.field("a", pa.null(),
metadata={"ARROW:extension:name": "arrow.test"})])
)
with pa.ipc.new_file("/tmp/test_ext_no_meta.arrow", table.schema) as f:
f.write(table)
with pa.ipc.open_file("/tmp/test_ext_no_meta.arrow") as f:
result = f.read_all()
print(result.schema)
pa.register_extension_type(DummyExtType())
with pa.ipc.open_file("/tmp/test_ext_no_meta.arrow") as f:
result = f.read_all()
print(result.schema)
```
And the same for write/read Parquet (where we get the extension type from
the ARROW:schema)
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