Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/12599#issuecomment-213275326
@cloud-fan If we do not produce objects, it should work. Otherwise, we will
hit the exception when the parent node calculates the statistics:
https://github.com/apache/spark/blob/da8859226e09aa6ebcf6a1c5c1369dec3c216eac/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala#L307
Previously, I just simply use the child's `statistics` value as the
`statistics` of `SerializeFromObject`. Obviously, it does not help.
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