Github user dongjoon-hyun commented on the pull request:
https://github.com/apache/spark/pull/13087#issuecomment-220662788
@marmbrus @markhamstra @thunterdb .
Now, this code and description of this PR is rollbacked my second commit 7
days ago.
For `common subexpression elimination`, I think it's okay if the some
optimizer reduces the number of UDF calls. It's expectable. How do you think
about this?
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