Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/11864#issuecomment-199579942
Just a minor issue in the description:
```SQL
df.select('a, 'b).filter('c > rand(42))
```
Actually, since 'c is not selected, we need to update the filter to
`filter('a > rand(42))` or `filter('b > rand(42))`
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