Github user mengxr commented on a diff in the pull request: https://github.com/apache/spark/pull/3869#discussion_r22490186 --- Diff: mllib/src/test/scala/org/apache/spark/mllib/linalg/VectorsSuite.scala --- @@ -175,6 +177,33 @@ class VectorsSuite extends FunSuite { assert(v.size === x.rows) } + test("sqdist") { + val random = new Random(System.nanoTime()) + for (m <- 1 until 1000 by 10) { + val nnz = random.nextInt(m) + 1 + + val indices1 = random.shuffle(0 to m - 1).toArray.slice(0, nnz).sorted --- End diff -- `0 until m` should be the same as `0 to m - 1`. However, `shuffle` doesn't recognize `... until ..`. Searched on Google and found https://issues.scala-lang.org/browse/SI-6948 ~~~scala scala> import scala.util.Random import scala.util.Random scala> val random = new Random random: scala.util.Random = scala.util.Random@1e16c33f scala> random.shuffle(0 until 10) <console>:10: error: Cannot construct a collection of type scala.collection.AbstractSeq[Int] with elements of type Int based on a collection of type scala.collection.AbstractSeq[Int]. random.shuffle(0 until 10) ^ scala> random.shuffle(0 to 10 - 1) res1: scala.collection.immutable.IndexedSeq[Int] = Vector(0, 1, 3, 9, 7, 4, 2, 8, 6, 10, 5) ~~~
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