Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/19136
I think I've addressed all the comments, but I still have some naming that
I'm not confident about.
1. is it OK to add the `V2` suffix in all related classes and packages?
2. I created 3 packages for the 3 kinds of optimization traits: `downward`,
`upward` and `scan`. Any better ideas?
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