Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/661#discussion_r12311400
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/linalg/Vectors.scala
---
@@ -136,7 +136,7 @@ object Vectors {
new DenseVector(v.toArray) // Can't use underlying array
directly, so make a new one
}
case v: BSV[Double] =>
- new SparseVector(v.length, v.index, v.data)
+ new SparseVector(v.length, v.index.slice(0, v.used),
v.data.slice(0, v.used))
--- End diff --
`slice` allocates a new array even when `v.used == v.index.length`. Could
you check `v.used == v.index.length` first?
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