Github user aarondav commented on the pull request:
https://github.com/apache/incubator-spark/pull/605#discussion_r9850119
The exact same confusion led me to centralize and document this :)
Just as a stylistic thing, I think we can put these on one line (that's the
ideal for single-line functions without braces). Also the [R] is inferred from
the return type, so this is sufficient:
`def returnType(): ClassTag[R] = JavaSparkContext.fakeClassTag`
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