milesgranger opened a new pull request, #39781:
URL: https://github.com/apache/arrow/pull/39781
I think the hash, especially for `FileMetaData` could be better, maybe just
use return of `__repr__`, even though that won't include row group info?
### Rationale for this change
Helpful for dependent projects.
### What changes are included in this PR?
Impl `__hash__` for `ParquetSchema` and `FileMetaData`
### Are these changes tested?
Yes
### Are there any user-facing changes?
Supports hashing metadata:
```python
In [1]: import pyarrow.parquet as pq
In [2]: f = pq.ParquetFile('test.parquet')
In [3]: hash(f.metadata)
Out[3]: 4816453453708427907
In [4]: hash(f.metadata.schema)
Out[4]: 2300988959078172540
```
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