Github user viirya commented on the issue:
https://github.com/apache/spark/pull/18652
When we join two tables, given there are equi-join keys, and they are
non-deterministic, for example `t1.a = rand(t2.b)` and `t1.c = rand(t2.d)`. We
pull out them to downstream project:
Join [t1.a = rand(t2.b), t1.c = rand(t2.d)]
Project [t1.a, t1.c]
TableScan t1
Project [rand(t2.b) as rand(t2.b), rand(t2.d) as rand(t2.d)]
TableScan t2
`rand(t2.b)` and `rand(t2.d)` are evaluated in projection. Why Join will
change its order?
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