Github user srowen commented on a diff in the pull request: https://github.com/apache/spark/pull/14914#discussion_r77129894 --- Diff: mllib-local/src/main/scala/org/apache/spark/ml/linalg/Matrices.scala --- @@ -999,7 +999,7 @@ object Matrices { val data = new ArrayBuffer[(Int, Int, Double)]() dnMat.foreachActive { (i, j, v) => if (v != 0.0) { - data.append((i, j + startCol, v)) + data.+=((i, j + startCol, v)) --- End diff -- You can write `data += ((i, j + startCol, v))` Yes, I think it may be worth optimizing this because append actually expects varargs. There are many more instances in the code though. I think it's reasonable to fix this everywhere. At least non-test code, and at least anything where performance could be important.
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