[GitHub] [spark] viirya commented on a change in pull request #24293: [SPARK-27385][SQL]add mapPartitionWithIndex to Dataframe

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viirya commented on a change in pull request #24293: [SPARK-27385][SQL]add mapPartitionWithIndex to Dataframe
URL: https://github.com/apache/spark/pull/24293#discussion_r272084473
 
 

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 File path: sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala
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 @@ -1427,6 +1427,15 @@ class DataFrame private[sql](
     rdd.mapPartitions(f)
   }
 
+  /**
+    * Returns a new RDD by applying a function to each partition of this DataFrame, while tracking the index
+    * of the original partition.
+    * @group rdd
+    */
+  def mapPartitionsWithIndex[R: ClassTag](f: Iterator[Row] => Iterator[R]): RDD[R] = {
 
 Review comment:
   Except for branch-1.6 issue others pointed, doesn't `rdd.mapPartitionsWithIndex` accepts `f: (Int, Iterator[T]) => Iterator[U]`? The give function doesn't have the partition index parameter?

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