[HIVE-3671] If a query has been optimized by correlation optimizer, join auto convert cannot optimize it

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Not A Problem
• Component/s: Query Processor
• Assignee: Yin Huai
• Reporter: Yin Huai
• Created: 05/Nov/12 15:11
• Updated: 18/Jul/13 16:25
• Resolved: 18/Jul/13 16:25

Description

Currently, if a query has been optimized by correlation optimizer, the first operator at the reduce side will be CorrelationReducerDispatchOperator. Since CommonJoinResolver will only work if the first operator at the reduce side is a join operator, join auto convert cannot optimize this query. This jira is used to discuss how to make correlation optimizer compatible with join auto convert.

Issue Links

• is blocked by: HIVE-2206 add a new optimizer for query correlation discovery and optimization