Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/8511#discussion_r38269140
--- Diff:
core/src/main/scala/org/apache/spark/rdd/ZippedPartitionsRDD.scala ---
@@ -134,6 +143,7 @@ private[spark] class ZippedPartitionsRDD4
extends ZippedPartitionsBaseRDD[V](sc, List(rdd1, rdd2, rdd3, rdd4),
preservesPartitioning) {
override def compute(s: Partition, context: TaskContext): Iterator[V] = {
+ tryPrepareChildren()
--- End diff --
instead of duplicating this, can we make `compute` in the base class
`final`, and have it call a `protected def doCompute` that the subclasses
override?
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