Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/1428#issuecomment-49210382
I'm not sure I agree with that. This is a pretty niche optimization not
something fundamental about the expressions that is required for correct
evaluation (and the first version of this code had a bunch of mistakes).
Having all of these rules in one place made it easier for me to realize that
when doing the review.
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