[HIVE-530] Map Join followup: optimize number of map-reduce jobs

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.4.0
• Fix Version/s: 0.4.0
• Component/s: Query Processor
• Hadoop Flags: Reviewed
• Release Note: HIVE-530. Map Join followup: optimize number of map-reduce jobs. (Namit Jain via zshao)
• Assignee: Namit Jain
• Reporter: Namit Jain
• Created: 02/Jun/09 05:23
• Updated: 17/Dec/11 00:07
• Resolved: 29/Jun/09 19:37

Description

Instead of creating a temporary destination after every mapJoin, avoid where-ever possible.
Also, replace the Select after MapJoin with a ForwardOperator