Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/11864#issuecomment-199550418
@gatorsmile You're right. Note that code removed in this PR is already dead
paths since now the predicate can't reference any non-deterministic fields. On
the other hand, it's OK to push down a predicate containing non-deterministic
expressions. For example:
```
df.select('a, 'b).filter('c > rand(42))
```
is equivalent to
```
df.filter('c > rand(42)).select('a, 'b)
```
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