[HIVE-7796] Provide subquery pushdown facility for storage handlers

• Type: Improvement
• Status: Patch Available
• Priority: Minor
• Resolution: Unresolved
• Component/s: StorageHandler
• Assignee: Navis Ryu
• Reporter: Navis Ryu
• Created: 20/Aug/14 05:27
• Updated: 15/Dec/14 02:22

Description

If underlying storage can handle basic filtering or aggregation, hive can delegate execution of whole subquery to the storage and handle it as a simple scanning operation.

Experimentally implemented on JDBC / Phoenix handler and seemed working good. Hopefully open the code for those too, but it's not allowed to me yet.