Github user yinxusen commented on a diff in the pull request:
https://github.com/apache/spark/pull/14051#discussion_r69612547
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/RowMatrix.scala
---
@@ -537,7 +537,7 @@ class RowMatrix @Since("1.0.0") (
def tallSkinnyQR(computeQ: Boolean = false): QRDecomposition[RowMatrix,
Matrix] = {
val col = numCols().toInt
// split rows horizontally into smaller matrices, and compute QR for
each of them
- val blockQRs = rows.glom().map { partRows =>
+ val blockQRs = rows.retag(classOf[Vector]).glom().map { partRows =>
--- End diff --
Since it's a known Java type erased issue
(https://issues.apache.org/jira/browse/SPARK-2737), I am not sure wether to fix
it or not. If leaving it as is, then Java users should aware of it and retag
the JavaRDD themselves. Otherwise we fix its constructors with either retaging
the `rows` or adding a new JavaRDD constructor. However this may not be a
single sample.
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