Tom-Newton opened a new issue, #49078:
URL: https://github.com/apache/arrow/issues/49078
### Describe the bug, including details regarding any error messages,
version, and platform.
### Reproduce:
```
import pyarrow.fs
azure_fs = pyarrow.fs.AzureFileSystem(account_name="test", sas_token="test")
print(azure_fs.__reduce__())
subtree_fs = pyarrow.fs.SubTreeFileSystem("/tmp", azure_fs)
print(subtree_fs.base_fs.__reduce__())
```
Returns
```
(<cyfunction AzureFileSystem._reconstruct at 0x79d22010c940>,
({'account_name': 'test', 'account_key': '', 'blob_storage_authority':
'.blob.core.windows.net', 'blob_storage_scheme': 'https', 'client_id': '',
'client_secret': '', 'dfs_storage_authority': '.dfs.core.windows.net',
'dfs_storage_scheme': 'https', 'sas_token': 'test', 'tenant_id': ''},))
(<cyfunction AzureFileSystem._reconstruct at 0x79d22010c940>,
({'account_name': 'test', 'account_key': '', 'blob_storage_authority':
'.blob.core.windows.net', 'blob_storage_scheme': 'https', 'client_id': '',
'client_secret': '', 'dfs_storage_authority': '.dfs.core.windows.net',
'dfs_storage_scheme': 'https', 'sas_token': '', 'tenant_id': ''},))
```
Notice how the first result the `sas_token` is not empty but the second one
is.
### Cause:
The `sas_token` and a couple of the other values returned by
`AzureFileSystem.__reduce__` read from `self` of the python side
`AzureFileSystem` object. When constructing a `SubTreeFileSystem`, the python
side `AzureFileSystem` object is discarded and the `SubTreeFileSystem` only
holds a pointer to the `CAzureFileSystem`. Therefore its not possible to
reconstruct a python side `AzureFileSystem` including the attributes on `self`
of the original `AzureFileSystem`.
### Component(s)
Python
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