Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/8511#discussion_r38269129
--- Diff:
core/src/main/scala/org/apache/spark/rdd/ZippedPartitionsRDD.scala ---
@@ -73,6 +73,13 @@ private[spark] abstract class ZippedPartitionsBaseRDD[V:
ClassTag](
super.clearDependencies()
rdds = null
}
+
+ protected def tryPrepareChildren() {
--- End diff --
`Unit` return type. Also can you add a java doc to this:
```
/**
* Call the prepare method of every children that has one.
* This is needed for reserving execution memory in advance.
*/
```
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