jorisvandenbossche commented on a change in pull request #7688:
URL: https://github.com/apache/arrow/pull/7688#discussion_r452158369
##########
File path: python/pyarrow/fs.py
##########
@@ -63,6 +63,32 @@ def __getattr__(name):
)
+def _ensure_filesystem(filesystem):
+ if isinstance(filesystem, FileSystem):
+ return filesystem
+
+ # handle fsspec-compatible filesystems
+ try:
+ import fsspec
+ except ImportError:
+ pass
+ else:
+ if isinstance(filesystem, fsspec.AbstractFileSystem):
+ if type(filesystem).__name__ == 'LocalFileSystem':
+ # In case its a simple LocalFileSystem, use native arrow one
+ return LocalFileSystem()
+ return PyFileSystem(FSSpecHandler(filesystem))
+
+ # map old filesystems to new ones
+ from pyarrow.filesystem import LocalFileSystem as LegacyLocalFileSystem
+
+ if isinstance(filesystem, LegacyLocalFileSystem):
+ return LocalFileSystem()
+ # TODO handle HDFS?
Review comment:
@pitrou Do you have any idea about this one? The "legacy" one defined in
`io-hdfs.pxi` is backed by the C++ `arrow::io::HadoopFileSystem`, and the new
filesystem is backed by `arrow::fs::HadoopFileSystem` which itself holds a
`arrow::io::HadoopFileSystem` as "client".
So naively I would say (with some additional methods), one should be able to
make a new HadoopFileSystem by wrapping the C++ "client" of the legacy
filesystem?
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