samredai commented on a change in pull request #4021:
URL: https://github.com/apache/iceberg/pull/4021#discussion_r799082313
##########
File path: python/src/iceberg/io/base.py
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@@ -24,7 +24,40 @@
"""
from abc import ABC, abstractmethod
-from typing import Union
+from typing import Protocol, Union, runtime_checkable
+
+
+@runtime_checkable
+class InputStream(Protocol):
+ def read(self, n: int) -> bytes:
+ ...
Review comment:
@emkornfield I think I follow. It sounds like when using FileIO
instances throughout the library, you're saying we have to support those that
produce file-like objects (which we pass into `PythonFile` then into pyarrow)
as well as those that produce `pyarrow.NativeFile` instances which can just be
passed directly to pyarrow.
In that case, instead of defining Protocols, should we just use typehints
for the `InputFile` and `OutputFile` classes to specify that either
[typing.IO](https://docs.python.org/3/library/typing.html#typing.IO) or
`pyarrow.NativeFile` can be returned?
```py
from abc import ABC, abstractmethod
from typing import Union, IO
from pyarrow import NativeFile
class InputFile(ABC):
...
def open(self) -> Union[IO, NativeFile]
...
class OutputFile(ABC):
...
def create(self) -> Union[IO, NativeFile]:
...
```
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