ingomueller-net commented on issue #47398:
URL: https://github.com/apache/arrow/issues/47398#issuecomment-3220726665

   I investigated a bit more. `pyarrow` is built with Substrait support 
alright. That's how we can get an error from `pyarrow/substrait.py`. The 
problem is rather (as the error message says) that some package from with 
`substrait` (standalone!) cannot be found. The difference in our environments 
explains why it fails/failed for me: I used `substrait==0.12.1`; starting with 
`substrait==0.15`, it works. Presumably, that version starts to include the 
protobuf definitions (at least, under that name). The proper fix, thus, seems 
to be to require that version in some setup file (or test for that version in 
`pyarrow/substrait.py`).


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