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
##########
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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