[PIG-3585] Make union work with tez

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: tez-branch
• Fix Version/s: tez-branch
• Component/s: tez
• Assignee: Cheolsoo Park
• Reporter: Cheolsoo Park
• Created: 22/Nov/13 23:25
• Updated: 21/Nov/14 05:59
• Resolved: 01/Dec/13 23:11

Description

Unlike MR, union needs to be implemented as multiple vertices because Tez doesn't allow multiple inputs in root vertex.

I propose that we implement union by connecting load vertices to union vertex with broadcasting edges.