Github user viirya commented on the issue:
    I have concern about @jiangxb1987's previous comment:
    > The reason I don't use Project operator is that might change the result 
correctness, for example, suppose we have join condition rand(1) > 0 && 
rand(11) < 0, the operator Project(Seq(rand(1), rand(11)), child) will always 
eval the both rand functions, which will change the result.

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