[GitHub] [arrow] wjones127 commented on pull request #35453: GH-35331: [Python] Expose Parquet sorting metadata

["wjones127 (via GitHub)" <gi...@apache.org>]

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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