[HIVE-9106] improve the performance of null scan optimizer when several table scans share a physical path

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.15.0
• Fix Version/s: 1.1.0
• Component/s: Physical Optimizer
• Assignee: Pengcheng Xiong
• Reporter: Pengcheng Xiong
• Created: 15/Dec/14 20:17
• Updated: 12/Feb/15 23:40
• Resolved: 19/Dec/14 00:31

Description

Current fix HIVE-9053 addresses the correctness issue. The solution can be improved further when several table scans share a physical path.

Issue Links

• is related to: HIVE-9053 select constant in union all followed by group by gives wrong result
• links to: RB