[SPARK-15947] Make pipeline components backward compatible with old vector columns in Scala/Java

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 2.0.0
• Component/s: ML, MLlib
• Target Version/s: 2.0.0
• Assignee: Xiangrui Meng
• Reporter: Xiangrui Meng
• Created: 14/Jun/16 15:19
• Updated: 17/Jun/16 04:28
• Resolved: 16/Jun/16 21:32

Description

After SPARK-15945, we should make ALL pipeline components accept old vector columns as input and do the conversion automatically (probably with a warning message), in order to smooth the migration to 2.0.

-Note that this includes loading old saved models.- SPARK-16000 handles backward compatibility in model loading.