pitrou commented on code in PR #39781:
URL: https://github.com/apache/arrow/pull/39781#discussion_r1480191173
##########
python/pyarrow/_parquet.pyx:
##########
@@ -849,6 +849,18 @@ cdef class FileMetaData(_Weakrefable):
cdef Buffer buffer = sink.getvalue()
return _reconstruct_filemetadata, (buffer,)
+ def __hash__(self):
+ def flatten(obj):
Review Comment:
But then you probably want to make `pa.Buffer` hashable as well:
```python
>>> stream = pa.BufferOutputStream()
>>> stream.write(b"xxx")
3
>>> stream.getvalue()
<pyarrow.Buffer address=0x7f84af208000 size=3 is_cpu=True is_mutable=True>
>>> stream.getvalue() == b"xxx"
True
>>> hash(stream.getvalue())
Traceback (most recent call last):
Cell In[9], line 1
hash(stream.getvalue())
TypeError: unhashable type: 'pyarrow.lib.Buffer'
```
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