Github user dusenberrymw commented on the pull request:
https://github.com/apache/spark/pull/9458#issuecomment-154498683
Note: The following reproduces this issue on the latest Git head, 1.5.1,
and 1.5.0:
```python
from pyspark.mllib.linalg.distributed import RowMatrix
rows = sc.parallelize([[3, -6], [4, -8], [0, 1]])
mat = RowMatrix(rows)
mat._java_matrix_wrapper.call("tallSkinnyQR", True)
```
Should result in the following exception:
```
java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to
[Lorg.apache.spark.mllib.linalg.Vector;
```
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