[jira] [Created] (SPARK-20083) Change matrix toArray to not create a new array when matrix is already column major

["Seth Hendrickson (JIRA)" <ji...@apache.org>]

Seth Hendrickson created SPARK-20083:
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             Summary: Change matrix toArray to not create a new array when matrix is already column major
                 Key: SPARK-20083
                 URL: https://issues.apache.org/jira/browse/SPARK-20083
             Project: Spark
          Issue Type: Improvement
          Components: ML
    Affects Versions: 2.2.0
            Reporter: Seth Hendrickson
            Priority: Minor


{{toArray}} always creates a new array in column major format, even when the resulting array is the same as the backing values. We should change this to just return a reference to the values array when it is already column major.



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