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

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Incomplete
• Affects Version/s: 2.2.0
• Component/s: ML
• Labels: bulk-closed
• Assignee: Unassigned
• Reporter: Seth Hendrickson
• Created: 24/Mar/17 17:28
• Updated: 21/May/19 04:14
• Resolved: 21/May/19 04:14

Description

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.