Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/1710#discussion_r15681299
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/stat/correlation/SpearmanCorrelation.scala
---
@@ -89,20 +89,17 @@ private[stat] object SpearmanCorrelation extends
Correlation with Logging {
val ranks: RDD[(Long, Double)] = sorted.mapPartitions { iter =>
// add an extra element to signify the end of the list so that
flatMap can flush the last
// batch of duplicates
- val padded = iter ++
- Iterator[((Double, Long), Long)](((Double.NaN, -1L), -1L))
- var lastVal = 0.0
- var firstRank = 0.0
- val idBuffer = new ArrayBuffer[Long]()
+ val padded = iter ++ Iterator[((Double, Long), Long)](((Double.NaN,
-1L), -1L))
+ val firstEntry = padded.next()
+ var lastVal = firstEntry._1._1
+ var firstRank = firstEntry._2.toDouble
+ val idBuffer = new ArrayBuffer[Long]() += firstEntry._1._2
--- End diff --
`ArrayBuffer(firstEntry._1._2)`
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