Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/9993#issuecomment-159968877
I agree with @hvanhovell, this is already taken care of by common
subexpression elimination in codegen (i.e. even though the udf appears twice we
reuse the answer when doing evaluation). As a result I think this patch is
actually making things slower by adding another layer to the plan.
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