Fokko opened a new pull request, #6468:
URL: https://github.com/apache/iceberg/pull/6468
It causes to throw a cast exception:
```
---------------------------------------------------------------------------
ArrowNotImplementedError Traceback (most recent call last)
Input In [1], in <cell line: 7>()
3 cat = load_catalog('rest')
5 tbl = cat.load_table('fokko.uuid_partitioned')
----> 7 tbl.scan().to_arrow()
File ~/Desktop/iceberg/python/pyiceberg/table/__init__.py:386, in
DataScan.to_arrow(self)
375 from pyarrow.dataset import dataset
377 ds = dataset(
378 source=locations,
379 filesystem=fs,
(...)
383 schema=schema_to_pyarrow(self.table.schema()),
384 )
--> 386 return ds.to_table(filter=pyarrow_filter, columns=columns)
File /opt/homebrew/lib/python3.9/site-packages/pyarrow/_dataset.pyx:304, in
pyarrow._dataset.Dataset.to_table()
File /opt/homebrew/lib/python3.9/site-packages/pyarrow/_dataset.pyx:2549, in
pyarrow._dataset.Scanner.to_table()
File /opt/homebrew/lib/python3.9/site-packages/pyarrow/error.pxi:144, in
pyarrow.lib.pyarrow_internal_check_status()
File /opt/homebrew/lib/python3.9/site-packages/pyarrow/error.pxi:121, in
pyarrow.lib.check_status()
ArrowNotImplementedError: Unsupported cast from fixed_size_binary[16] to
extension<pyiceberg.uuid<UuidType>> (no available cast function for target type)
```
I tried to deserialize it into the custom type, but I didn't get to the
buffers. I decided to keep it a fixed[16] because:
- It would be a major performance penalty to move this to Python
- Also downstream have limited support for UUID
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