Github user liancheng commented on the pull request: https://github.com/apache/spark/pull/11200#issuecomment-184013932 At least there should be a vertical tree line connecting two `WholeStageCodegen` nodes to indicate that they are both children of `Union`? The `:` in plan tree string used to indicate that. Are you worrying about that users may mistake sub-trees under `WholeStageCodegen` for actual offspring nodes?
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