In version 0.13.0, the Table.from_pandas function modifies the input schema by making all non-nullable types nullable.
This can cause problems for example with this code:
Which fails due to the writer schema and the table schema being different.
I believe the direct cause could be https://github.com/apache/arrow/blob/master/python/pyarrow/table.pxi#L622 where nullable is set to True by default, resulting in the table schema being modified.
Thanks for your valuable work on this library.