[IMPALA-487] RHS of join should not require copying (and therefore enable codegen)

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 1.1
• Fix Version/s: Impala 1.2
• Assignee: Nong Li
• Reporter: Alan Choi
• Created: 25/Jul/13 22:18
• Updated: 18/Sep/13 17:18
• Resolved: 18/Sep/13 17:18

Description

Codegen is disabled whenver data copying is required. It used to be the case that the scan node from the right hand side of the join requires copying because both lhs and rhs of the scan node appear in the same fragment. As of now, scan node from the rhs of a join is in its own fragment. Therefore, it should not require copying data anymore (unless it's a single node plan). This should enable codegen.