[Python] io.BytesIO and pyarrow.BufferOutputStream

[Ian Joiner]

Hi,

According to https://arrow.apache.org/docs/python/memory.html
pyarrow.BufferOutputStream
has similar semantics to io.BytesIO. However the ORC writer apparently
works with paths, file objects and pyarrow.BufferOutputStream well but do
not work with io.BytesIO (i.e. the writer simply writes “ORC” but nothing
else there). As the person who got the ORC writer there in the first place
in 4.0.0 I’m baffled at this fact and want to fix it ASAP. I wonder what’s
going on. Shall I start from checking my C++ code or is the problem likely
in Cython / Python? Has anyone seen anything like that outside the context
of the ORC writer?

Thanks,
Ian