Github user gatorsmile commented on the pull request: https://github.com/apache/spark/pull/12599#issuecomment-213269638 The problem is the parent node calls the defaultSize of its child's output. ```scala val childRowSize = child.output.map(_.dataType.defaultSize).sum + 8 val outputRowSize = output.map(_.dataType.defaultSize).sum + 8 ``` Thus, we should check the dataType here.
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