[HIVE-8681] CBO: Column names are missing from join expression in Map join with CBO enabled

• Type: Improvement
• Status: Patch Available
• Priority: Major
• Resolution: Unresolved
• Assignee: Pengcheng Xiong
• Reporter: Pengcheng Xiong
• Created: 31/Oct/14 02:39
• Updated: 18/Dec/14 11:43

Description

On Hive 14 when CBO is enabled the column names are missing from the join expression. Rather than to use external names "key", "value", some internal names such as "_col0" or "_col1" are used. For map join with more than two tables it is very hard to figure the actual join order. In this patch, I am going to address this issue not only for join but also for all the other operators. And it will also be addressed in not only CLI but also TEZ environment.

Issue Links

• links to: RB