Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/448#issuecomment-42262939
@marmbrus @kanzhang I'm a bit confused how the bytecode could be totally
unchanged.
Let's say I create a new class `FooRDD.scala` in a totally different
package and I depend on `RDD` from Spark only via binary (e.g. I'm linking
against Spark). How does the compiler know whether `new FooRDD().cache()`
should return `FooRDD` or `RDD` if it's not included in the byte-code somewhere?
I think I may be missing something obvious ;)
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