Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/8956#issuecomment-148533198
Off topic but related, `SetInFilter.canDrop` can also leverage statistics
information:
```scala
private val min = valueSet.min
private val max = valueSet.max
override def canDrop(statistics: Statistics[T]): Boolean = {
statistics.getMax.compareTo(min) < 0 ||
max.compareTo(statistics.getMin) < 0
}
```
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