[jira] [Created] (SPARK-16372) RowMatrix constructor should use retag for Java compatibility

["Xusen Yin (JIRA)" <ji...@apache.org>]

Xusen Yin created SPARK-16372:
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             Summary: RowMatrix constructor should use retag for Java compatibility
                 Key: SPARK-16372
                 URL: https://issues.apache.org/jira/browse/SPARK-16372
             Project: Spark
          Issue Type: Bug
          Components: MLlib
            Reporter: Xusen Yin
            Priority: Minor


The following Java code because of type erasing:

{code}
JavaRDD<Vector> rows = jsc.parallelize(...);
RowMatrix mat = new RowMatrix(rows.rdd());
QRDecomposition<RowMatrix, Matrix> result = mat.tallSkinnyQR(true);
{code}

We should use retag to restore the type to prevent the following exception:

{code}
java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Lorg.apache.spark.mllib.linalg.Vector;
{code}



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