Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/2478#issuecomment-56858958
> what's the purpose of exposing an array of partition objects in
Scala&Java?
In Scala / Java, I think we expose Partition objects for use in custom RDD
implementations. There are a bunch of methods like `iterator()`, `compute()`,
`preferredLocations()`, etc. that take Partition objects. Outside of this
context, I'm not sure that they're useful to end-users.
(If you use IntelliJ, try running "Find Usages" on Partition and look at
the "Method Parameter Declaration" usages).
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