Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/12599#issuecomment-213272475
@viirya , yea you are right, `ObjectConsumer` may also produce objects, so
we should implement `statistic` in `SerializeFromObject`.
@gatorsmile I may misunderstand you point. What do you mean by `The problem
is the parent node calls the defaultSize of its child's output`? If we make
`SerializeFromObject.statistics` work, its parent should be OK too, as
`SerializeFromObject` will never produce objects.
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