Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/9393#issuecomment-153182111
@yhuai This only applies to UDFs. What if a user uses built-in expressions,
e.g.:
~~~scala
val a = b + c
val d = a * a
~~~
It may be useful to write
~~~scala
val a = (b + c).nondeterministic
val d = a * a
~~~
Btw, I would prefer `udf { x => x * x }.nondeterministic` instead of
`nondeterministicUdf { x => x * x }`. But it is minor.
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