Github user nongli commented on the pull request:
https://github.com/apache/spark/pull/9480#issuecomment-154137436
@chenghao-intel I'm not sure what you are suggesting. How do you suggest we
execute the expressions? The transformation you have as an example makes sense
but how does it get evaluated? What does Sequential do for the execution side?
Does it add an additional materialization to evaluate the earlier stages? How
does this work with a more complicated expression DAG?
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