coady opened a new issue, #36709:
URL: https://github.com/apache/arrow/issues/36709
### Describe the enhancement requested
As far as I can tell, it's not officially documented that grouping maintains
the order of its keys, but it has seemed that way until recently. Starting with
13.0.0.dev, I've noticed ordering changes intermittently. I think this is an
important feature of grouping, as with sorting.
This example outputs differences reliably on 13.0.0.dev516.
```python
import pyarrow as pa
array = pa.chunked_array([list('aba'), list('bcb')])
table = pa.table({'key': array})
for i in range(100):
groups = table.group_by(['key']).aggregate([])
if groups['key'].to_pylist() != list('abc'):
print(i, groups['key'])
```
### Component(s)
C++, Python
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