import pyarrow as pa
import lance

schema = pa.schema([pa.field("values", pa.utf8(), False)])
tab = pa.Table.from_pydict({"values": [None]}, schema=schema)
lance.write_dataset(tab, "/tmp/foo.dataset", mode='overwrite').to_table()

# thread '<unnamed>' panicked at /home/pace/.cargo/registry/src/index.crates.io-6f17d22bba15001f/arrow-array-50.0.0/src/array/struct_array.rs:90:46:
# called `Result::unwrap()` on an `Err` value: InvalidArgumentError("Found unmasked nulls for non-nullable StructArray field \"min_value\"")
# note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
# Traceback (most recent call last):
#   File "/tmp/repr.py", line 6, in <module>
#     print(lance.write_dataset(tab, "/tmp/foo.dataset", mode='overwrite').to_table())
#           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
#   File "/home/pace/dev/lance/python/python/lance/dataset.py", line 2347, in write_dataset
#     _write_dataset(reader, uri, params)
# pyo3_runtime.PanicException: called `Result::unwrap()` on an `Err` value: InvalidArgumentError("Found unmasked nulls for non-nullable StructArray field \"min_value\"")