Github user ueshin commented on the pull request:
https://github.com/apache/spark/pull/12655#issuecomment-214163952
@markhamstra Thank you for your comment.
I thought the non-optimal state in `DAGScheduler` was a kind of bug so I
used the words "incorrect" or "illegal" but now I see what you thought.
So yes, I was talking about only graphs and want to improve `DAGSchduler`
performance by this and #12060.
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