GH-44677: [C++][Acero] Enhance partition sort example (#44678)

### Rationale for this change partition sort example: out_arr value is row id not actual value. ### What changes are included in this PR? - partition_util.h ### Are these changes tested? no ### Are there any user-facing changes? comment change * GitHub Issue: #44677 Authored-by: light-city <[email protected]> Signed-off-by: mwish <[email protected]>
apache · Nov 10, 2024 · 63e683c · 63e683c
1 parent 03c3f8e
commit 63e683c
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/cpp/src/arrow/acero/partition_util.h b/cpp/src/arrow/acero/partition_util.h
@@ -54,10 +54,11 @@ class PartitionSort {
   /// in_arr: [5, 7, 2, 3, 5, 4]
   /// num_prtns: 3
   /// prtn_id_impl: [&in_arr] (int row_id) { return in_arr[row_id] / 3; }
-  /// output_pos_impl: [&out_arr] (int row_id, int pos) { out_arr[pos] = row_id; }
+  /// output_pos_impl: [&sorted_row_ids] (int row_id, int pos) { sorted_row_ids[pos] =
+  /// row_id; }
   ///
   /// After Execution
-  /// out_arr: [2, 5, 3, 5, 4, 7]
+  /// sorted_row_ids: [2, 0, 3, 4, 5, 1]
   /// prtn_ranges: [0, 1, 5, 6]
   template <class INPUT_PRTN_ID_FN, class OUTPUT_POS_FN>
   static void Eval(int64_t num_rows, int num_prtns, uint16_t* prtn_ranges,