wjones127 commented on PR #35453:
URL: https://github.com/apache/arrow/pull/35453#issuecomment-1536823450
Intended usage:
```python
import pyarrow as pa
import pyarrow.parquet as pq
import pyarrow.compute as pc
tab = pa.table({
'a': pa.array([1, 3, 2, 2]),
'b': pa.array(['a', 'b', 'c', 'd'])
})
sort_keys = [('a', 'ascending'), ('b', 'descending')]
sorted_tab = tab.sort_by(sort_keys)
pq.write_table(tab, 'data.parquet', sorting_columns=sort_keys)
metadata = pq.read_metadata('data.parquet')
metadata.row_group(0).sorting_columns
pq_file = pq.ParquetFile('data.parquet')
sort_order, null_placement = pq_file.sort_order
assert sort_order == sort_keys
assert null_placement == "at_end"
```
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