Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/12599#issuecomment-213264156
The object operators are really special, it breaks the contract that
operator will always produce unsafe rows, so their usage is quite limited.
Generally speaking, an `ObjectProducer` will always have an `ObjectConsumer`
nearby to turn it back to unsafe rows. So if we implement `statistics` for
`ObjectConsumer`, there should be nowhere else that will estimate size for
object type.
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