[HIVE-11937] Improve StatsOptimizer to deal with query with additional constant columns

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.0.0
• Assignee: Pengcheng Xiong
• Reporter: Pengcheng Xiong
• Created: 23/Sep/15 17:47
• Updated: 16/Feb/16 23:50
• Resolved: 30/Sep/15 00:57

Description

Right now StatsOptimizer can deal with query such as "select count(1) from src" by directly looking into the metastore. However, it can not deal with "select '1' as one, count(1) from src" which has an additional constant column. We may improve it.