jorisvandenbossche commented on pull request #7349:
URL: https://github.com/apache/arrow/pull/7349#issuecomment-639062788
A first test case is working, using fsspec's in-memory filesystem:
```
In [1]: import pyarrow.parquet as pq
...: import pyarrow.dataset as ds
...:
...: from pyarrow.fs import PyFileSystem
...: from pyarrow.tests.test_fs import FSSpecHandler
In [2]: import fsspec
In [3]: memfs = fsspec.filesystem("memory")
In [4]: table = pa.table({'a': [1, 2, 3]})
In [5]: with memfs.open("test", "wb") as f:
...: pq.write_table(table, f)
...:
In [6]: dataset = ds.dataset("test",
filesystem=PyFileSystem(FSSpecHandler(memfs)))
In [7]: dataset.to_table(filter=ds.field('a') > 1).to_pandas()
Out[7]:
a
0 2
1 3
```
I only have a bit trouble finding a robust way to get a file handle for an
open file from the fsspec filesystem, but so that is not related to this PR ;)
For the rest it was quite easy to get this working!
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