Re: [PR] GH-35331: [Python] Expose Parquet sorting metadata [arrow]

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

judahrand commented on code in PR #37665:
URL: https://github.com/apache/arrow/pull/37665#discussion_r1342485832


##########
python/pyarrow/_parquet.pyx:
##########
@@ -505,6 +506,204 @@ cdef class ColumnChunkMetaData(_Weakrefable):
         return self.metadata.GetColumnIndexLocation().has_value()
 
 
+cdef class SortingColumn:
+    """
+    Sorting specification for a single column.
+
+    Returned by :meth:`RowGroupMetaData.sorting_columns` and used in
+    :class:`ParquetWriter` to specify the sort order of the data.
+
+    Parameters
+    ----------
+    column_index : int
+        Index of column that data is sorted by.
+    descending : bool, default False
+        Whether column is sorted in descending order.
+    nulls_first : bool, default False
+        Whether null values appear before valid values.
+
+    Notes
+    -----
+
+    Column indices are zero-based, refer only to leaf fields, and are in

Review Comment:
   This is made clear in the docstrings of the Parquet Writer: https://github.com/apache/arrow/blob/5db4e8e243ec8ca6724252bca7f478a0c417e76e/python/pyarrow/parquet/core.py#L885-L888



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