[HIVE-11267] Combine equavilent leaf works in SparkWork[Spark Branch]

• Type: Sub-task
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Component/s: Spark
• Assignee: Chengxiang Li
• Reporter: Chengxiang Li
• Created: 15/Jul/15 10:57
• Updated: 16/Jul/15 02:13

Description

There could be multi leaf works in SparkWork, like self-union query. If the subqueries are same with each other, we may combine the subqueries, and just execute once, then fetch twice in FetchTask.

Issue Links

• is related to: HIVE-11082 Support multi edge between nodes in SparkPlan[Spark Branch]