[KYLIN-2483] SortedIteratorMergerWithLimit could be slower when number of total merge rows is small

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Not A Problem
• Assignee: Hongbin Ma
• Reporter: Hongbin Ma
• Created: 05/Mar/17 14:43
• Updated: 11/Mar/17 06:12
• Resolved: 06/Mar/17 07:41

Description

if the pushed down limit is small enough (say less than 100), SortedIteratorMergerWithLimit will bring RELATIVELY significant costs. I'm adding a new configuration entry called kylin.query.merge-sort-partition-results.min-limit (default 100) to fix this issue