GitHub user yinxusen opened a pull request:
https://github.com/apache/spark/pull/14051
[SPARK-16372][MLlib] RowMatrix constructor should use retag for Java
compatibility
## What changes were proposed in this pull request?
The following Java code because of type erasing:
```Java
JavaRDD<Vector> rows = jsc.parallelize(...);
RowMatrix mat = new RowMatrix(rows.rdd());
QRDecomposition<RowMatrix, Matrix> result = mat.tallSkinnyQR(true);
```
We should use retag to restore the type to prevent the following exception:
```Java
java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to
[Lorg.apache.spark.mllib.linalg.Vector;
```
## How was this patch tested?
Java unit test
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/yinxusen/spark SPARK-16372
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14051.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #14051
----
commit 82b4edd374cd5cd0f4f7c87e8d2e5ec7d3fbf3f1
Author: Xusen Yin <yinxu...@gmail.com>
Date: 2016-07-05T00:03:44Z
add retag
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