Github user viirya commented on the issue:
https://github.com/apache/spark/pull/18652
Join [t1.a = rand(t2.b), t1.c = rand(t2.d)]
Sort
Project [t1.a, t1.c]
TableScan t1
Sort
Project [rand(t2.b) as rand(t2.b), rand(t2.d) as rand(t2.d)]
TableScan t2
Aren't `rand(t2.b)` and `rand(t2.d)` already evaluated in `Project`? Why
`Sort` will change the evaluation order?
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