Github user chiwanpark commented on the pull request:
https://github.com/apache/flink/pull/1220#issuecomment-146202529
It sounds weird for me. If the user sets `useQuadTree` to false, the
algorithm should not use quadtree. Otherwise if the user sets `useQuadTree` to
true, the algorithm should check whether quadtree can be used or not.
I don't think that `ListBuffer` is better than `Vector`. For example, we
can implement `partitionBox` like following:
```scala
def partitionBox(cPart: Seq[Vector], L: Vector): Seq[Vector] = {
var next = cPart
(0 until L.size).foreach { i =>
next = next.flatMap { v =>
val (up, down) = (v.copy, v)
up.update(i, up(i) - L(i) / 4)
down.update(i, down(i) + L(i) / 4)
Seq(up, down)
}
}
next
}
```
There are still some style issues in this PR. I recommend reformatting all
codes in this PR using IDE such as IntelliJ IDEA.
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