srowen commented on a change in pull request #26826:
[SPARK-30195][SQL][CORE][ML] Change some function, import definitions to work
with stricter compiler in Scala 2.13
URL: https://github.com/apache/spark/pull/26826#discussion_r355826708
##########
File path: mllib-local/src/main/scala/org/apache/spark/ml/linalg/Matrices.scala
##########
@@ -1237,7 +1237,6 @@ object Matrices {
val allValues = new Array[Double](numRows * numCols)
var startRow = 0
matrices.foreach { mat =>
- var j = 0
Review comment:
Unused; just zapped it while here
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