Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/3378#issuecomment-63774979
We should definitely add a ClassTag since this can be used for primitive
types. However, there might be places where we create a lot of CompactBuffers.
I haven't had a chance to look at where CompactBuffers are used yet, but for
those places, would it be possible to create a single ClassTag reference?
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