Github user ash211 commented on the pull request:
https://github.com/apache/spark/pull/2281#issuecomment-54597321
I don't see that contract in the API documented in the Scaladoc for the
method:
```
588 /**
589 * Return a new RDD by applying a function to each partition of this
RDD.
590 *
591 * `preservesPartitioning` indicates whether the input function
preserves the partitioner, which
592 * should be `false` unless this is a pair RDD and the input
function doesn't modify the keys.
593 */
594 def mapPartitions[U: ClassTag](
595 f: Iterator[T] => Iterator[U], preservesPartitioning: Boolean =
false): RDD[U] = {
596 val func = (context: TaskContext, index: Int, iter: Iterator[T])
=> f(iter)
597 new MapPartitionsRDD(this, sc.clean(func), preservesPartitioning)
598 }
```
Should I send a PR documenting it?
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